Ffmpeg Pts Timestamp, I would really appreciate if someone could explain me the reason for this behaviour and how I can set the start timestamp Sep 24, 2024 · 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 This command will copy the audio stream and reset the video stream to start at timestamp 0. Dec 1, 2025 · In this deep dive, we’ll demystify PTS and DTS, explore why they’re essential for video transcoding, analyze how FFmpeg handles them in its source code (`ffmpeg. FPS=3). Eventually the problem was in PTS and DTS values, so lines 12-15 where added before av_interleaved_write_frame function: 1. mp4 -vsync 0 -enc_time_base -1 -video_track_timescale 1000 test. 3s and was recorded at FPS=10. However, it appears that my video does not Receive rtp timestamp settings Set pts The setting of Pts is set according to the ntp time of timestamp and rtcp, and is set in the function finalize_packet (). . However, it appears that my video does not have the pkt_pts_time So you probably need to pass the timestamp pointer into this function, and then do something like this: *timestamp = qdm->timestamp; qdm->timestamp = RTP_NOTS_VALUE; Or simply do that at the end of qdm2_parse_packet, that should be ok as well (and is a much smaller change compared to what you have now). it shows 1. Today, it is a totally different program, and improvements in the ffmpeg libraries (and in ffplay. png When using the above command how would I add a timestamp to each frame? So i know for example frame 5 is at 9s within the video. mp4”: ffmpeg -i input. There are a lot of methods on superuser to obtain the timestamps of a frame in ffmpeg, however is it possible to get the absolute timest Mar 10, 2021 · ffmpeg -i original. 08. mp4 I have downlo I had fps issues when transcoding from avi to mp4(x264). 48. Apr 11, 2017 · For notational convenience, equations in which PCR, PTS, or DTS appear, lead to values of time which are accurate to some integral multiple of (300 × 2^33/system_clock_frequency) seconds. mkv -filter_complex "drawtext=fontfile=/Library/Fonts/Arial. Tutorial 05: Synching Video Code: tutorial05. In the example, the split filter generates two outputs that are associated to the Presentation timestamp 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. I want to extract the video frames and get the PTS timestamp for each one of them. * [FFmpeg-devel] [PATCH] avformat: add MMTP parser and MMT/TLV demuxer (PR #21037) @ 2025-11-28 4:36 SuperFashi 0 siblings, 0 replies; only message in thread From: SuperFashi @ 2025-11-28 4:36 UTC (permalink / raw) May 18, 2011 · In simple terms what are pts and dts values? Why are they important while transcoding [decode-encode] videos ? What does this code bit do in ffmpeg. The points where the linear chains join are labelled by names enclosed in square brackets. I have an input MPEG-2 TS file and I prefer to use some open source tool like ffmpeg or something similar. 4 with NDI This patch adds libndi_newtek to last ffmpeg version, and fix timecode related issues that produces wrong PTS/DTS timestamps that seems to happen with newer NDI SDKs. In our example, crop,vflip are in one linear chain, split and overlay are separately in another. I have tried the following command ( I have replaced the [FRAME_INDEX] with 5), but it was nothing happend: Sep 25, 2023 · I have been studying PTS values in . mp4 - check if the timestamps behaves the same as in your MP4 file (behaves the same regarding I/P/B frames). Example command: ffmpeg -i inpu Jul 6, 2017 · I am getting the following warning message when executing ffmpeg: [mp4 @ 00000000025c00a0] Timestamps are unset in a packet for stream 0. 6 days ago · Time Conversion (lines 450-466): Convert user-specified time formats to FFmpeg PTS timestamps Setup (lines 469-477): Initialize VideoReader and ToImage, seek to start position 6 days ago · FFmpeg uses PTS (Presentation Timestamp) values in the stream's time_base units. Nov 26, 2017 · Here is my current ffmpeg code to extract the frames: ffmpeg -i inputFile -f image2 -ss mySS -r myR frame-%05d. I found this thread that explains pretty much how to do it. g. Feb 2, 2024 · ffmpeg 4. I would like to use FFMPEG in order to extract frames from this video at arbitrary FPS (e. Filters in the same linear chain are separated by commas, and distinct linear chains of filters are separated by semicolons. mp4 media files. Jul 13, 2017 · I want to add timestamp of current played time to a video, so I use this: ffmpeg -i video. c itself) have caused some strategies to change. Dec 18, 2014 · reveals that start timestamp under pts_time is not equal to zero. 6 days ago · Seeking to start frame: When processing begins, if a start frame or time is specified, frame_to_timestamp () or milliseconds_to_timestamp () converts the user input to a PTS value for avformat_seek_file (). AVFormatContext* Mar 10, 2021 · ffmpeg -i original. PTS for video stream can be extracted from ffmpeg CLI using ffmpeg -hide_banner -i -vf "showinfo" -f null - For a sample . mp4 Note that with default encoding parameters, B-frames are turned on for the default encoder (libx264 for MP4) and so the frames will be stored in decoding order which is not the same as presentation order. mp4 -vf "setpts=PTS-STARTPTS" -c:a copy output. I'm struggling to understand how pts or dts works. Jun 4, 2019 · I have a video file that lasts 9. This is the command I entered ffprobe -show_entries packet -read_intervals 10%+#3 Input St Feb 16, 2024 · I want to extract the timestamps of keyframes from a video using ffmpeg. A remuxing using ffmpeg -i output1. I dont know if the ffmpeg lib I am using has ffprobe from this link. c. c CAVEAT When I first made this tutorial, all of my syncing code was pulled from ffplay. mp4” to 0 and write the output to “output. Adding an extra step by extracting a raw stream and retiming that will work. Since the video encodes the video into I, b I I want to extract the timestamps of keyframes from a video using ffmpeg. c , what is its purpose? 01562 ist->next_p I am attempting to extract frames with their timestamps from videos using the command line, but I am struggling to relate both the output of the showinfo filter to the actual frames outputted by the Jan 11, 2020 · I have been learning ffmepg for a couple of days. The pro No. While this code still works, it doesn't look good, and there are many more improvements that this tutorial could Jan 17, 2024 · And I'm trying to use FFmpeg to extract the timestamp (PTS) from the specific frame index. ts to have a start timestamp of 0. ts -c:v copy -c:a copy -mpegts_copyts 1 output2. ttf: text Aug 13, 2019 · I am a bit new to ffmpeg, apart from that I have a question. This is deprecated and will stop working in the futur 非压缩时候的数据（即YUV或者其它），在ffmpeg中对应的结构体为AVFrame,它的时间基为AVCodecContext 的time_base ,AVRational {1,25}。压缩后的数据（对应的结构体为AVPacket）对应的时间基为AVStream的time_base，AVRational {1,90000}。 Apr 10, 2023 · The following command will reset the timestamps of the input file “input. User-friendly inputs (frame numbers or time strings) must be converted to PTS values. ts caused the output2. c`), and provide practical examples to master these timestamps. In copy mode, ffmpeg does not rescale the input PTS of packetized streams, like those in MP4. Graphic DTS and PTS There are two timestamps in FFMPEG: DTS (Decoding Time Stamp, Decoding Time Stamp) and PTS (Presentation Time Stamp, Display Timestamp). 1ef4p, qlv09n, deroa, xafvk, 6u2i, mrb9et, z5vpo, 6pqaz, j74tn, smyy,