Ffmpeg pts timestamp. jpg-vsync 0 - Each frame is passed with its timestamp from the demuxer to the muxer. mp4 - check if the timestamps behaves the same as in your MP4 file (behaves the I had fps issues when transcoding from avi to mp4(x264). 506 seconds. 00 1 0. Apr 11, 2017 · So, instead of recording a video as 25 fps, and thus implying that each frame should be drawn 0. mp4 -c copy -map 0 -AVDISPKIPB_flags +global_header output. Nov 24, 2014 · ffmpeg と PTS のはなし： setpts とか. I'm also re-encoding the mp4 file for different bitrates. mp4 -map 0:v -vcodec copy -bsf:v h264_mp4toannexb source-video. 00 seconds. This means that at 25 fps, the 50th frame (like your 50th image) will have a PTS of 2. mkv -r 1000 -f image2 -frame_pts 1 %d. Jan 17, 2024 · My input is a ts file. With ffprobe it is like following. c CAVEAT. mp4 Jul 31, 2019 · I am trying to extract the timestamps of mp4 video using ffmpeg. Nov 29, 2017 · ffmpeg -i <input> -vf "drawtext=text='%{pts\:hms}'" -f flv <output> the incoming timestamps are represented as microsecond precision by forcing the timebase to Jan 17, 2024 · My input is a ts file. ts When examining the output1. 5 seconds from the keyframe's actual timestamp does the trick. This is deprecated and will stop working in the future. ts using, ffplay -i output1. Here, the pts_time is the presentation timestamp of the frame Nov 16, 2020 · I'm trying to split an mp4 file into segments and each segment should start with near to zero a/v pts. The general command structure for manipulating PTS timestamps in FFmpeg is: ffmpeg -i input. Fix your code to set the timestamps properly [mp4 @ 00000000004b9040] pts has no value (second message is generated multiple times) still the output MP4 file looks/plays fine. my-program | ffmpeg -use_wallclock_as_timestamps 1 -i - -filter:v setpts='PTS-STARTPTS' out. It's relative presentation time depends on the start_time of the file, for which use -show_entries format=start_time . h264 -vcodec copy output. c itself) have caused some strategies to change. ) Nov 23, 2021 · # Extract the H264 stream from the source file to a raw H264 stream ffmpeg -i source. more explanation of mixing framerate -r option with frame_pts Nov 19, 2014 · What you can do is "simulate" the image writing process by filtering with the fps filter, then using ffprobe to show the timestamps of the generated frames. AVFormatContext* Apr 2, 2020 · You can assign the timestamps earlier, letting setpts simply normalize it to start from 0. 有了上面 I/B/P帧的概念，我们再来理解 PTS/DTS 就非常容易了。PTS（Presentation TimeStamp）是渲染用的 时间戳 ，也就是说，我们的视频帧是按照 PTS 的时间戳来展示的。DTS（Decoding TimeStamp）解码时间戳，是用于视频解码的。 那为什么有了 PTS 还要有 DTS呢？ [mp4 @ 00000000004b9040] Timestamps are unset in a packet for stream 0. Which ffmpeg command should I use to extract each frame number associated with its timestamp (time in ms from the starting of the video) ? Expected result : frame, ts 1, 34 2, 67 3, 101 4, 12 Dec 31, 2015 · Stack Exchange Network. 04 seconds apart, they store a timestamp for each frame e. mkv 28)-0. 04 2 0. 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. This is the command I am using: Aug 13, 2019 · I am a bit new to ffmpeg, apart from that I have a question. mp4 PTS/DTS. There is not much documentation, but I think that in newer versions of FFmpeg AVFrame::pkt_pts was declared deprecated, so ffprobe doesn't show 'pkt_pts_time' entries. h264 # Force FFMPEG to regenerate the PTS values for the H264 stream ffmpeg -fflags +genpts -r 60 -i source-video. 08 3 0. I think your hypophysis about the P-Frame and B-Frames might be wrong (it's hard to tell). This is the command I used; ffmpeg -i & Feb 16, 2024 · pts_time is the equivalent for pkt_pts_time. -r 1000 - set the framerate to the output to 1000Hz, for converting the index to milliseconds. Note that PTS and DTS are not equivalent. txt I want to extract the video frames and get the PTS timestamp for each one of them. When I first made this tutorial, all of my syncing code was pulled from ffplay. 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 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 Dec 18, 2014 · I'm using ffmpeg to generate a MPEG-TS stream using the following command. 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. png Credits goes to this superuser answer . – Sep 24, 2024 · Please show the FFmpeg command you have tried using setts. For bash you need to use bc to evaluate expressions with decimals, but in zsh -ss 00:00:$[$(ffnearest input. The advisable way to do this is using the option -output_ts_offset N where N is in seconds. 48. it shows 1. c. 5] works. mp4 Let’s break down the used options and flags:-i input. 12 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. mp4 -use_wallclock_as_timestamps is assigned by the libavformat framework when receiving the packet. mp4 -c:v libx265 -x265-params crf=25 -c:a copy output1. (annoyingly, telling ffmpeg to seek to exactly to the timestamp of the keyframe seems to make ffmpeg exclude that keyframe in the output, but subtracting 0. ffmpeg中常用的几个时间戳： rtcp_ntp_timestamp: 真实时间， 绝对时间，在网络传输时的时间基(1 << 32)， rtcp_timestamp: rtcp时间，一般会有一个base, 在网络传输时的时间基90000 rtp_timestamp: rtp时间，和rtcp_timestamp类似，网络时间基90000 Avpacket->pts: 通过如上计算得到，video Sep 24, 2024 · With FFmpeg, you can manipulate and correct PTS timestamps to fix playback problems in Chromium apps. Jan 11, 2020 · pts_time=6. g. . txt 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. ts -vf showinfo reveals that start timestamp under pts_time is not equal to zero. Frame pts_time 0 0. 2. Eventually the problem was in PTS and DTS values, so lines 12-15 where added before av_interleaved_write_frame function: 1. A remuxing using Jul 5, 2018 · If the container allows it, you can start at non-zero PTS. I have tried the following command ( I have replaced the [FRAME_INDEX] with 5), but it was nothing happend: ffmpeg -i 0. ffmpeg -i file1. The presentation time (PTS) is the correct one. 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. And I'm trying to use FFmpeg to extract the timestamp (PTS) from the specific frame index. FFmpeg Command Structure. if I am to do any seek to operation in FFMPEG, given that the FFPROBE Mar 29, 2019 · Q1. 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. Today, it is a totally different program, and improvements in the ffmpeg libraries (and in ffplay. PTS：Presentation Time Stamp。PTS 主要用于度量解码后的视频帧什么时候被显示出来。 DTS：Decode Time Stamp。DTS 主要是标识读入内存中的Bit流在什么时候开始送入解码器中进行解码。 虽然 DTS、PTS 是用于指导播放端的行为，但它们是在编码的时候由编码器生成的。 Aug 13, 2019 · Stack Exchange Network. PTS和DTS. May 18, 2011 · I found it clearer to find information in the answer page rather than a link. Jun 4, 2019 · ffmpeg -vsync 0 -i video. 506000 means an absolute presentation timestamp of 6. 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. 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 timestamp that is close to real time from a live video stream? Jan 11, 2020 · pts_time=6. Jul 13, 2017 · Stack Exchange Network. ffmpeg -skip_frame nokey -i file -vsync 0 -frame_pts true out%d. ts -vf "select=gte(n\, [FRAME_INDEX])" -show_entries frame=pkt_pts_time -v quiet -of csv="p=0" -stats -y output. -frame_pts 1 - Use current frame pts for filename. Tutorial 05: Synching Video Code: tutorial05. I have an input MPEG-2 TS file and I prefer to use some open source tool like ffmpeg or something similar. The problem is that when I am using -vf showinfo option it shows me a restamped PTS.