Ffmpeg pts timestamp example. copyts stops all that and relays input timestamps.

Ffmpeg pts timestamp example Oct 26, 2012 · pts : Presentation timestamp in time_base units; the time at which the decompressed packet will be presented to the user. If possible just skip the rescale. Dec 8, 2022 · break pts = global_key_pts*video_time_base # Scale global_key_pts by video stream time-base - convert timestamp to seconds # Transform the bytes read into a NumPy array, and reshape it to video frame dimensions frame = np. duration = duration; This looks creepy, especially combined with the video alike code. input. Definition at line 235 of file avutil. I can easily do that using Python as long as I know how I can separate between the frames. png is the name of the output image file. ffmpeg -i file1. txt I would like to see the simple output something like: pts:15000 or 15000 Dec 1, 2020 · Use the setpts (set presentation timestamp) video filter (-vf). ffprobe seeks to keyframes, so it will seek to the nearest KF at or before the specified time and then print info for the stated number of packets. This is deprecated, use time(0) instead. avi -t 00:00:01 -vframes 1 images-filename_%03d. Before getting to this question I did some research and found many controversial answers, which make it even more confusing. mp4 -map 0:v -vcodec copy -bsf:v h264_mp4toannexb source-video. png, where <timestamp> represents milliseconds elapsed since the first image. I have found the method used by dranger's tutorial not to be sufficient. Example. I used a combination of methods: checking AVFrame. Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all frame timestamp estimated using various heuristics, in stream time base Code outside libavcodec should access this field using: av_frame_get_best_effort_timestamp(frame) encoding: unused; decoding: set by libavcodec, read by user. 066667 FFmpeg will, by default, remove any starting offset to input timestamps or adjust timestamps if they overflow (roll over) or have a large gap. ts using, ffplay -i output1. Example encoded input, example output video if you want to examine the frames. 5。 Jan 8, 2017 · Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all May 5, 2023 · From: Martin Machalek <martin. exe -ss 00:50 -i all. png' file '296. Look at the actual packets, please. The presentation timestamp in input. mp4 is the name of the input video file, [FRAME\_INDEX] is the index of the frame you want to extract, and output\_%04d. This is the lowest framerate with which all timestamps can be represented accurately (it is the least common multiple of all framerates in the stream). example in the ffmpeg FAQ on Concat see '3. Gst. set_state(Gst. the 1st bit indicates if 8-bit should be signed or unsigned, the 2nd bit indicates if 16-bit should be signed or unsigned, etc Feb 24, 2021 · ffmpeg -i inputFile. To preserve it, add -copyts. setpts=2*N+5/TB where N is frame index starting from 0, and TB is the timebase of the stream. Example: while Generated on Fri Jan 10 2025 19:24:14 for FFmpeg by May 31, 2011 · Generated on Tue May 31 19:21:55 2011 for FFmpeg by 1. You will have to modify the timestamp before the drawtext filter and restore the original value afterwards i. State. Jan 8, 2017 · Can be AV_NOPTS_VALUE if it is not stored in the file. duration. With FFmpeg, you can manipulate and correct PTS timestamps to fix playback problems in Chromium apps. To extract frames from video without timestamps I use this syntax: ffmpeg -i video. drawtext. Sep 2, 2012 · But video's AVCodecContext->time_base == 1001 / 60000. webm After that, I've faced one more problem. Examples Oct 12, 2010 · Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand Jan 8, 2017 · Here is a list of all examples: avio_http_serve_files. k. rawframe->pkt_* : Fields copied from packet, discovered after reading this post . pts = AV_NOPTS_VALUE; pkt. c bps: bits-per-sample : flt: floating-point : be: big-endian : sflags: signed flags. I want to know once and for all, how time base calucaltion and rescaling works in FFMPEG. Both timestamps are written to a text file. A player should decode but not display packets with negative PTS, and the video should start accurately. starting at 2022-03-26T15:51:49. And there's no way to customize this timestamp format. 'TB' The timebase of the input timestamps. Actually,only the first one produces correct PTS for me. Command line examples. Jun 23, 2016 · When we get a packet from av_read_frame(), it will contain the PTS and DTS values for the information inside that packet. mp4 -use_wallclock_as_timestamps is assigned by the libavformat framework when receiving the packet. The problem here is that the first packet for both will have a timestamp of zero, regardless of inter-packet delay between the streams. Jul 10, 2013 · FFmpeg internal timebase and timestamp definitions. Some example values: setpts=0. 8 1. The general command structure for manipulating PTS timestamps Jan 8, 2017 · Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all Oct 13, 2017 · Question. ts -vf "select=gte(n\, [FRAME_INDEX])" -show_entries frame=pkt_pts_time -v quiet -of csv="p=0" -stats -y output. Overall, I am also confused that b-frames do not cause any frame order problem. The DTS time stores this other codec-related ordering. 8 Jul 5, 2016 · 1) Regarding the video & audio timestamps Rather than use a current frameIndex as the timestamp, and then later rescaling them. best_effort_timestamp, checking AVPacket. 7334,setpts=PTS-STARTPTS" -an output. Jan 17, 2024 · To extract a specific frame index using FFmpeg's timestamp (PTS), you can use the following command: In this command, input. c; decode_audio. For example, to scale a video and change its speed, you could use this command: num 表示的是分子，den表示分母。 对于time_base来说num就是1，den表示每一秒等分了多少份。 上面说过通过pts*time_base就可以得出时间戳，所以需要计算出每个时间刻度具体代表多少，所以通过av_q2d得出每个刻度具体值。 May 24, 2024 · setpts sets the PTS timestamps, but doesn't modify the "frame period". It's relative presentation time depends on the start_time of the file, for which use -show_entries format=start_time . webm \ -filter_complex "fps=30, setpts=PTS-STARTPTS" \ -acodec libvorbis -vcodec libvpx \ -vsync 1 -async 1 -r 30 -threads 4 out. #define AVFMT_TS_NEGATIVE 0x40000 Format allows muxing negative timestamps. Returns the pts of the last muxed packet + its duration. pts = av_rescale_q ( pts, formatCtx->streams[videoStream]->time_base, AV_TIME_BASE_Q ); In this format, pts is in nanoseconds. STARTDTS. \n" "This program reads frames from a file, decodes them, and writes decoded\n" "video frames to a rawvideo file named video_output_file, and decoded\n" First off, Use int64_t pts = av_frame_get_best_effort_timestamp(pFrame) to get the pts. I want to be able to save the images with the capture time. This fixes the first issue I raised. mp4 -c:v libx265 -x265-params crf=25 -c:a copy output1. It should be possible to insert new keyframe at the beginning and recode video fragment till next keyframe (there may be simplier ways, but it depends on actual video codec used). To slow down a video by a factor (e. png timestamp is that the actual timestamp of the frame may not be exactly equal to Jan 8, 2017 · Convert the next timestamp from input to output timestamps are in 1/(in_sample_rate * out_sample_rate) units. Some formats misuse the terms dts and pts/cts to mean something different. I think your hypophysis about the P-Frame and B-Frames might be wrong (it's hard to tell). Definition at line 242 of file avutil. If you know of and are sure of the framerate, generate using that, or assign relative wallclock time by setting use_wallclock_as_timestamps with value true as a format option for the demuxer. com> Adds DTS to packets which would otherwise break tbr calculation within libavformat, as well as packet rate calculation in ffmpeg. Frame pts_time 0 0. pts (i. c, decode_video. Or start all timestamps from zero (or any positive value), so that they are displayed as well. Examples Jan 8, 2017 · pts: input presentation timestamp. ts When examining the output1. The frames can be stored out-of-order in the file, and the data may need to be read or written out-of-order to be reconstructed. I have tried the following command ( I have replaced the [FRAME_INDEX] with 5), but it was nothing happend: ffmpeg -i 0. ts For each new segment I calculate necessary -initial_offset as sum of all previous segments length. Examples: Jan 11, 2020 · pts_time=6. Not set to anything currently. The duration in input. dts: input decoding timestamp. Definition at line 515 of file frame. mp4 example: a web rip had borders and a speedup to avoid algorims. h. 48. Note, this value is just a guess! For example, if the time base is 1/90000 and all frames have either approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1. Nov 17, 2018 · Run. Examples: Nov 26, 2017 · frame_pts option is your friend set it to true and ffmpeg will output the frame's presentation timestamp as your filename. Working in c++. 5*PTS" fast. mkv The filter works by changing the presentation timestamp (PTS) of each video frame. setpts=PTS*10,drawtext=,setpts=PTS/10 where the factor 10 is the ratio of realtime between frames and their display interval in the timelapse video. png' file '178. 264), and the timestamps are part of the container (say MP4). putText(frame, str(pts I have a directory full of images following the pattern <timestamp>. PTS. Demuxers read a media file and split it into chunks of data (packets). How do I drawtext video playtime (“elapsed time”) on a video, with FFmpeg's --filter_complex option?. Feb 16, 2014 · * the motion of the chroma plane does not match the luma plane. POS. rgbframe->pts / write_frame: inframe->pts: Presentation timestamp of decoded frame converted to RGB. May 2, 2021 · hms stands for a formatted [-]HH:MM:SS. Feb 11, 2019 · Here is the command example: ffmpeg -fflags +genpts -acodec libopus -vcodec libvpx \ -i in. Thus, we have to multiply them by 0. setpts ('PTS-STARTPTS') basically resets the timestamp to 0 after a trim filter has been passed. The description of -vsync 0 isn't accurate and was written 8+ years ago: Each frame is passed with its timestamp from the demuxer to the muxer. 5 and 1, respectively. Can be AV_NOPTS_VALUE if it is not stored in the file. That's physical evidence. png' file '97. At least not for the hms format. 5后作为新的PTS值。 比如说: 帧A当前的PTS是4000(根据以前的知识，根据PTS和Time_base可以计算出渲染的时间点)。 假设对应的时间点是: 00:00:05, 现在将PTS调整为0. Look, I know it is hard for you to accept that FFmpeg's timestamps are wrong. Summary of the bug: When adding a timecode to a mov output, I get an error: [mov @ 0x125827000] Application provided duration: -9223372036854775808 / timestamp: -9223372036854775808 is out of range for mov/mp4 format [mov @ 0x125827000] pts has no value Sep 4, 2018 · How can I get timestamp of a frame in a video or rtmp stream from pts and time_base or duration? Thanks a lot! import av def init_input(file_name): global a container = av. First I am getting position where I need to start reading static double t = 10 ;//time in sec Jan 12, 2018 · Examples: decode_audio. For example, if a stream has 24 frames per second, a PTS of 42 is going to indicate that the frame should go where the 42nd frame would be if there we had a frame every 1/24 of a second (certainly not necessarily true). mp4 -filter:v "setpts=2. The demux timestamp in input. The delta time between two consecutive timestamps can't exceed the "frame period". 265 file does not have any timing information, so this is probably the reason why I can't use pts\:hms . 2666666666666666:end=4. Run it, for example, like so: ffmpeg -hide_banner -f lavfi -i testsrc -filter:v showinfo -f null /dev/null Jan 17, 2024 · ffmpeg -i 0. mp4 -r 25-filter setpts=PTS/5 output_25fps. output should be the same frames but at 25 fps, making the output video 5x faster. frombuffer(raw_frame, np. now(). my-program | ffmpeg -use_wallclock_as_timestamps 1 -i - -filter:v setpts='PTS-STARTPTS' out. the retuned value is undefined when used with a demuxer. PLAYING), but I also use a callback function on the arrival of each new sample where datetime. 5*PTS就变成了2000,那么对应的渲染时间点就变成了: 00:00:02. Text expansion. Nov 2, 2022 · The pts function will just use the stored timestamp. Nov 29, 2017 · I would like to embed the computer's local time in milliseconds into a stream using FFMPEG. read_frame: d. AVFormatContext* Using `showinfo’ from `ffprobe’¶ You can not use it with “drawtext” directly because this filter seems not to expose the metadata. Dec 16, 2021 · 위키피디아를 통해 PTS의 의미를 살펴보면, > The presentation timestamp (PTS) is a timestamp metadata field in an MPEG transport stream or MPEG program stream that is used to achieve synchronization of programs’ separate elementary streams (for example Video, Audio, Subtitles) when presented to the viewer. This makes me quite confused, and I don't understand them. Try to examine the timestamps of the following generated video file: ffmpeg -y -f lavfi -i testsrc=size=384x216:rate=30:duration=10 -c:v libx264 -pix_fmt yuv420p test. mp4. a. txt contains a list of the interesting images: file '0. The alternative would then be to make sure PTS values (in outputFrame->pts) are created correctly in the first place by using the video's frames-per-second (FPS). machalek@24i. This value is a timestamp that corresponds to a measurement of time in that stream's time_base unit. reordered_opaque to exactly one of the values provided by the user through AVCodecContext. timestamp() (i. Start counting PTS from zero Oct 27, 2016 · read_frame: d. 581333 what timestamp would I use? Jul 4, 2022 · @Gyan It does seem to affect it, for example 1 clip I have cut out without reencoding as mp4 has with avoid_negative_ts turned on video stream start at start_pts=3600 start_time=0. 0001, the first attempts results in 43 frames (duration of 1. 33x speed; setpts=0. 506000 means an absolute presentation timestamp of 6. 0*PTS - half the speed; For example, to double the speed of a Jan 17, 2011 · Because of this, you have to take special care when determining the PTS of a decoded frame. Apr 27, 2020 · Looks like your video packets don't come with timestamps so ffmpeg assigns them AV_NOPTS_VALUE which is what you see. 04 rather than bringing it to 0, this has happened in multiple files Jan 8, 2017 · Undefined timestamp value. , 2x slower), you can use a setpts value greater than 1: ffmpeg -i input. Thanks, @Gyan - sorry just to clarify, I am going to load the images into the browser in a web application, if a user clicks on an image, say image 11 and chooses to delete, I will trim the video using that images corresponding timestamp, in this case, the 11th second. mp4 -vf "trim=start=3. c, decode_filter_video. Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all Jun 27, 2016 · Can be AV_NOPTS_VALUE if it is not stored in the file. png Jan 8, 2017 · This is the lowest framerate with which all timestamps can be represented accurately (it is the least common multiple of all framerates in the stream). Especially if your purpose is debugging of the filter graph written by yourself, display such as pts may also be useful. pos: Generated on Tue Nov 6 2018 18:11:56 for FFmpeg by May 9, 2013 · PTS/DTS issues are my primary source of anger when dealing with video. ffprobe shows a pts only for the first frame, no others have one. It worked, But the timestamp is messed up and doesn't accurately describe when i made the video. Usually reported by demuxer that work on containers that do not provide either pts or dts. g. mp4 While the difference in the end timestamp is only 0. You're using FFmpeg functions to 'prove' things. 5*PTS" output. In the lavf API this process is represented by the avformat_open_input() function for opening a file, av_read_frame() for reading a single packet and finally avformat_close_input(), which does the cleanup. These commands adjust the video speed by manipulating the presentation timestamps (PTS). mp4 | tail -1 This will print values in the form of 118231200|3600 where the first value is the pts and the second the duration of the last packet of the video stream. int64_t : dts : Decompression timestamp in time_base units; the time at which the packet is decompressed. In which case, the video trim isn't precise and includes extra frames. Mar 31, 2013 · I'm trying to extract frames from a video and get the exact timestamps of each frame extracted (on a picture). Jul 31, 2019 · Here, the pts_time is the presentation timestamp of the frame. Example: while Generated on Thu Sep 26 2024 23:16:25 for FFmpeg by Sep 7, 2023 · ffmpeg -i input. 1 to have fr%5d in front. ffprobe -v 0 -show_entries packet=pts,duration -of compact=p=0:nk=1 -read_intervals 999999 -select_streams v video. e. 14. . Nov 6, 2018 · Examples: decode_audio. Dec 1, 2020 · Use the setpts (set presentation timestamp) video filter (-vf). Referenced by frame_copy_props(). if I am to do any seek to operation in FFMPEG, given that the FFPROBE duration is 10. reordered_opaque Jan 28, 2008 · The image2 reader in ffmpeg can assign timestamps based on the modification time of the file, with nanosecond precision. Such timestamps must be converted to true pts/dts before they are stored in AVPacket. pkt_pts=N/A pkt_pts_time=N/A pkt_dts=2 pkt_dts_time=0. png I would like to know how I can get a timestamp instead (minutes_seconds offset from beginning), for example, the frame @ 5 min 23 sec 98 ms should be written to the file outputFile_05_23_98. May 16, 2023 · You might be able to use setpts='PTS-STARTPTS' filter to reset timestamps and showinfo filter to print information about each frame to stderr and command 2>&1 | grep showinfo | grep pts_time:[0-9. jpeg You signed in with another tab or window. Feb 5, 2024 · ffmpeg -i input. data: Data allocated by av_malloc() to be used as packet data. A remuxing using Nov 24, 2014 · ffmpeg と PTS のはなし： setpts とか. ts -vf showinfo reveals that start timestamp under pts_time is not equal to zero. Currently I'm using this command for one camera: ffmpeg -f video4linux2 -pixel_format yuv420p -timestamps abs -I /dev/video0 -c:a jpeg -t 60 -ts_from_file 2 camera0-%5d. copyts stops all that and relays input timestamps. get_buffer(). ffmpeg の -filter_complex オプションを使用する例で setpts=PTS-STARTPTS のようなものを見たことがあるかもしれません。これが、ffmpegで動画加工するときに超重要になることがあります。 さっき、PTSについて説明した通り、各 Jan 17, 2024 · My input is a ts file. Aug 29, 2017 · Is there an easy way to do this using the ffmpeg libraries? I've looked at av_frame_get_best_effort_timestamp as well as codec_context->time_base, but that seems to give the answers in seconds since the beginning of the video, and I don't necessarily know when the video started. dts: the number of bytes of the input bitstream used. ts -vcodec copy -acodec copy -f segment -initial_offset 10 -segment_format mpegts out%d. open(file_name) Jun 18, 2015 · example: input was recorded at 5 fps. – Michael IV Commented Sep 30, 2017 at 20:52 在循环读入解码后的帧数据之后，可以直接通过iframe->pts来读取当前帧的pts值，然后再乘以刻度值就可以得出当前时间戳iframe->pts * av_q2d(_time_base)。 伪代码如下： Nov 23, 2021 · # Extract the H264 stream from the source file to a raw H264 stream ffmpeg -i source. reordered opaque 64bit (generally an integer or a double precision float PTS but can be anything). Jan 12, 2018 · 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 0. Let's say it is 1/1000 Nov 6, 2018 · FFmpeg internal timebase and timestamp definitions. e. The original position in the file of the packet, or undefined if undefined for the current packet DTS. Jul 11, 2011 · I need to extract frames in certain interval of the video, (eg from 40 sec to 50 sec). it shows 1. more explanation of mixing framerate -r option with frame_pts Sep 10, 2015 · Can be AV_NOPTS_VALUE if it is not stored in the file. Examples: For example, all the packets belonging to frame Nr. Jul 20, 2014 · Format does not require strictly increasing timestamps, but they must still be monotonic. mkv May 18, 2011 · The presentation time (PTS) is the correct one. 0*PTS" slow. E. 1 from all except the first segment input to the concat process Sep 24, 2024 · Please show the FFmpeg command you have tried using setts. c; avio_list_dir. You can use -vf showinfo for get frame information using ffmpeg . png' I am using ffmpeg to concatenate these images into a video: Jul 2, 2024 · That's why 'ffmpeg -f framecrc' gives correct timestamps that match the actual packets. The same documentation: If the format is set to localtime or gmtime, a third argument may be supplied: a strftime() format string. This is due to ffmpeg's behavior, as has been discussed in detail in #26, #208 and shown in this example. Changing the timestamps prior to encoding is risky since ffmpeg's framerate conversion method uses timestamps to check sync drift and make decisions about dropping or duplicating frames. I was looking for a tutorial/book that would teach me how to start to use FFmpeg as a library (a. ]* -o | grep [0-9. mp4 -filter:v "setpts=0. Example: while Generated on Thu Apr 18 2024 22:43:15 for FFmpeg by Mar 15, 2018 · I'm using ffmpeg to save the video feed from the cameras to multiples jpeg files (30 jpeg per second per camera). 000000 pkt_dts=1 pkt_dts_time=0. To do this May 25, 2013 · FFmpeg internal timebase and timestamp definitions. Assuming I have a video whose duration is 150 seconds: Apr 11, 2017 · So, instead of recording a video as 25 fps, and thus implying that each frame should be drawn 0. 00 1 0. time_base is of type AVRational, which is a rational number composed of a numerator and a denominator, as opposed to using a decimal point. mp4 Mar 26, 2022 · Desired outcome. ]* -o > timestamps. Add overlay with timestamp for each frame of a video based on the original creation time for the video. Oct 27, 2016 · Undefined timestamp value. The PTS value in the AVFrame structure after decoding is not valid. See What is video timescale, timebase, or timestamp in ffmpeg? The setpts filter evaluates the expression and assigns the value as the timestamp for the current frame it is processing. 04 seconds apart, they store a timestamp for each frame e. c. When automatic timestamp compensation is not used, (min_compensation >= FLT_MAX) in this case timestamps will be passed through with delays compensated Sep 7, 2023 · ffmpeg -i input. Some example values: For example, to double the speed of a video: Filters are combined using a comma to separate them. The DTS of the The included file is . I want to decode the PTS from the PCR. FPS=3). Not possible on Win, AFAICT. DURATION. 'RTCSTART' The wallclock (RTC) time at the start of the movie in microseconds. So based on official FFMPEG examples one has to . h264 # Force FFMPEG to regenerate the PTS values for the H264 stream ffmpeg -fflags +genpts -r 60 -i source-video. 5*PTS表示将帧的PTS值乘以0. FFmpeg will, by default, remove the starting offset. The argument to the setpts filter is a formula for how to set the timestamp. 433333 seconds), while the second one gives 45 frames (duration of 1. reshape((height, width, 3)) # Draw the timestamp over the frame cv2. Examples: Sep 24, 2024 · Using FFmpeg to Fix PTS Timestamps. 50 seconds). May 30, 2016 · I'm not able to display current timestamp like described in this post using text='%{pts\:hms}'. Reload to refresh your session. 3s and was recorded at FPS=10. 5. ffmpeg -i input_5fps. Note that when using -ss before -i, FFmpeg will locate the keyframe previous to the seek point, then assign negative PTS values to all following packets up until it reaches the seek point. Examples decode_audio. Jan 8, 2017 · Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all Apr 2, 2020 · You can assign the timestamps earlier, letting setpts simply normalize it to start from 0. 000000Z and a second later in the video present 2022-03-26T15:51. pos: Generated on Fri Jan 12 2018 01:48:27 for FFmpeg by Jan 8, 2017 · pkt: packet to be initialized. And I'm trying to use FFmpeg to extract the timestamp (PTS) from the specific frame index. For example, if there are two succesive frames shown at timestamps 1 and 2, and you want to speed up the video, those timestamps need to become 0. txt to pipe ffmpeg's stderr to stdout, filtering out the lines containing timestamps information and saves them Jan 8, 2017 · pts: input presentation timestamp. Aug 13, 2015 · m_prevAudioDts = dts; pkt. Examples Now, the trimming s/w can handle the timestamps of those reference frames in two ways: Assign them a negative PTS, so that they are available for decoding, but not displayed. Pipeline(). c; avio_read_callback. (I don FFmpeg is the leading multimedia framework, able to decode, encode, transcode, mux, demux, stream, filter and play pretty much anything that humans and machines have created. Second you must make sure both streams you are syncing use the same time base. However, it will only ever be behind the target timestamp, so you can just av_read_frame until you get to where you want, using AVframe->pts * AVStream->timebase to calculate what time the frame is (use av_rescale to do this). So far I have extracted the PTS values using FFMPEG and I have a list for each frame which PTS it has. Why setpts doesn't modify the "frame period"? The reason is that the "frame period" is part of the encoded stream (say H. Definition at line 248 of file avutil. */ Nov 26, 2019 · Probably related to keyframe interval used in original video (e. The advisable way to do this is using the option -output_ts_offset N where N is in seconds. uint8). I would like to use FFMPEG in order to extract frames from this video at arbitrary FPS (e. 08 3 0. Basically, you need to store the PTS value of the first packet for each decoded frame. ffmpeg -skip_frame nokey -i file -vsync 0 -frame_pts true out%d. By default, YYYY-MM-DD HH:MM:SS format will be Dec 25, 2019 · Stack Exchange Network. If the fontconfig support is disabled, or if you don’t want to care of the fontconfig (or if you aren’t familiar with it), you must specify fontfile, so the most minimalistic example for you is: Mar 26, 2019 · 这就是pts的转换。 根据pts来计算一桢在整个视频中的时间位置： timestamp(秒) = pts * av_q2d(st->time_base) duration和pts单位一样，duration表示当前帧的持续时间占多少格。或者理解是两帧的间隔时间是占多少格。一定要理解单位。 pts：格子数 av_q2d(st->time_base): 秒/格 Using `ashowinfo’ from `ffprobe’¶ You can not use it with “drawtext” directly because this filter seems not to expose the metadata. uint8_t * data: int : size: int : stream_index: int : flags: int : duration : Duration of this packet in time_base Mar 18, 2015 · The timestamps from smp. Mar 20, 2014 · How to get the time stamp of the extracted image obtained by using ffmpeg? What option is to be passed to the ffmpeg command? The current command that i am using is: ffmpeg -i video. 000000Z Aug 12, 2013 · This can be scripted and can follow the std. ffmpeg -i in. wall time) is called. mkv -filter:v "setpts=0. A packet contains one or more encoded frames which belongs to a single elementary stream. Examples: Mar 10, 2021 · You'll need to set 3 parameters to obtain identical timestamps: -vsync 0 to avoid frame duplication and timebase adjustment, -enc_time_base -1 to avoid timebase adjustment at the encoder layer, and -video_track_timescale with the inverse of the source timebase. Minimal example¶ see also. 5*PTS - double the speed; setpts=0. Referenced by do_video_stats(), and print_report(). png Credits goes to this superuser answer . Consequent frames' PTS and DTS (in generic case they would be the same) shall be equal to previousPacketPTS + curtrentPacket. * -use_wallclock_as_timestamps 1 FFmpeg is the leading multimedia framework, able to decode, encode, transcode, mux, demux, stream, filter and play pretty much anything that humans and machines have created. ttf: text='timestamp: %{pts \: hms}': x=5: y=5: fontsize=16: [email protected] : box=1: [email protected] " -c:a copy -c:v libx264 -map 0 output. You switched accounts on another tab or window. 25*PTS - quadruple the speed; setpts=2. 66*PTS - roughly 1. pts MUST be larger or equal to dts as presentation cannot happen before decompression, unless one wants to view hex dumps. The demux timestamp in input in case of ts or dts option or presentation timestamp in case of pts option. Maybe the video codec is part of the reason. Examples: decoding_encoding. reordered_opaque to represent the input at that time, the decoder reorders values as needed and sets AVFrame. Take a look at this page of a good ffmpeg tutorial and see how they handle this problem. avi, and therefore has to presentation timestamps, only decoding timestamps. Jan 12, 2018 · FFmpeg internal timebase and timestamp definitions. mp4 Slow down a video. Dec 18, 2014 · I'm using ffmpeg to generate a MPEG-TS stream using the following command. rescale output packet timestamp values from codec to stream timebase Oct 27, 2016 · Can be AV_NOPTS_VALUE if it is not stored in the file. png' file '242. FFmpeg Command Structure. mp4 - check if the timestamps behaves the same as in your MP4 file (behaves the see also. . Fortunately, FFMpeg supplies us with a "best effort" timestamp, which you can get via, av_frame_get_best_effort_timestamp() 🇨🇳 🇰🇷 🇪🇸 🇻🇳 🇧🇷. Eventually the problem was in PTS and DTS values, so lines 12-15 where added before av_interleaved_write_frame function: 1. Examples The previous output PTS. Examples: Nov 3, 2013 · "API example program to show how to read frames from an input file. Example command: ffmpeg -i inpu Jul 13, 2017 · I want to add timestamp of current played time to a video, so I use this: ffmpeg -i video. The user sets AVCodecContext. I had fps issues when transcoding from avi to mp4(x264). #define AVFMT_SEEK_TO_PTS 0x4000000 Seeking is based on PTS. 50. c, and pts: input presentation timestamp. Jul 5, 2018 · If the container allows it, you can start at non-zero PTS. dts and pts, and maybe a few other things I can't remember. I can embed the local time in seconds using drawtext like so: ffmpeg -i &lt;input&gt; -vf "drawtext=tex Apr 14, 2014 · Th user's first example and the one right after " Or alternative way:" do not produce the same PTS. c, and transcode. 04 2 0. The above output, however, does not have any audio attached to the output. Feb 2, 2009 · This seeks to the nearest keyframe! Which could be pretty far from you want. I'm using the actual packets. png' file '363. Mar 5, 2018 · ffmpeg. mkv -filter_complex "drawtext=fontfile=/Library/Fonts/Arial. mp4 -vf select Jun 17, 2015 · Timestamp could be adjusted with -initial_offset parameter of -f segment format: ffmpeg -i in. The easiest way to do this is convert everything to AV_TIME_BASE_Q. Note There are 2 slightly differently behaving modes. h264 -vcodec copy output. So, on a linux box, you can parse the filename and generate a timestamp and touch the mtime of the file. 033333. #define AVINDEX_KEYFRAME 0x0001 #define AV_DISPOSITION_DEFAULT 0x0001 #define Jan 6, 2022 · The only issue is that only the second and third frames appear to have the same timestamps in Gstream (not in Ffmpeg), other than these two frames remaining video plays just fine. Jun 4, 2019 · I have a video file that lasts 9. txt PTS は必須の要素で、そのフレームが再生されるべき時間を表します。 DTS はオプショナルの要素で、そのフレームをデコードすべき時間を表します。 FFmpeg の ffprobe コマンドを使うと TS ファイルの各フレームの PTS を見ることができます。 You signed in with another tab or window. Basically used if one wishes to manually examine and adjust timestamps using setpts filter or setts bitstream filter. Dec 9, 2024 · ffmpeg -i input. Thus although this filter can be used from ffmpeg and ffplay as well as other filters, but if you just want to get information, doing so is not worth much. Jan 8, 2017 · pts: input presentation timestamp. You signed out in another tab or window. mkv. This function will set the data, size, and buf fields, all others are left untouched. But what we really want is the PTS of our newly decoded raw frame, so we know when to display it. c, and filtering_video. produced by GStreamer) are relative to setting the pipeline state to playing (i. every 10 seconds). Oct 7, 2019 · PTS stands for Presentation TimeStamps. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. each bit corresponds to one byte of bit depth. Definition at line 122 of file utils. Using this my rendered output looks like this: Using this my rendered output looks like this: I understand that raw H. 'PREV_OUTT' previous output time in seconds 'RTCTIME' The wallclock (RTC) time in microseconds. libav) and then I found the "How to write a video player in less than 1k lines" tutorial. Is there a (hopefully simple) way to transport the timestamps from the original content when converting with ffmpeg? Or even a tool to transfer timestamps regardless of ffmpeg? Mar 23, 2014 · Undefined timestamp value. 506 seconds. For example extracting frame when scene change and get time stamp for that particular frame. mp4 -r 1 outputFile_%02d. dts = m_currAudioDts; m_currAudioDts += duration; pkt. 12 Quite an old question, but it's still worth answering, since FFMPEG doesn't make it easy. FFmpeg is a powerful, open-source multimedia framework that allows users to handle multimedia data in various formats. 040000 and audio stream at 0, when it's turned off, both streams start at 0, this also seems counterintuitive as the option changes it from 0 to 0. -show_frames: pkt_pts=0 pkt_pts_time=0. mkv -c:v libx264 -crf 18 -preset veryslow -c:a copy out. mmm timestamp with millisecond accuracy. 4' section here Note the 'tail' cmd and the explain about dropping line no. prnjkr endf wew map qgal mfgf xnwr exe zsfresx xysjl