WebJun 10, 2024 · Start both pts's from zero (0). Audio pts will increase by 'sample per frame' for each frame. This is typically audio_sample_rate / frame_rate (i.e. 48000/60 = 800). For the video, things are different and somewhat simpler. Video pts will increase same amount of 'Video frame duration' per frame. Use this cheat sheet to calculate the duration: WebDec 9, 2012 at 14:48. @theateist: Duration of one frame is 1 second / fps (might be more clear to call that interval between frames, but it's also the duration of how long one frame is supposed to be displayed for). So at 25fps, it is 0.040 seconds. If the timebase is set to 1/25 and your stream is 25fps, then frame times (pts in the timebase ...
c - FFMPEG :Adjusting PTS and DTS of encoded packets with real ...
WebDec 23, 2024 · 2. The main issue is setting packet duration to pts: frame->pkt_duration = frame->pts. The duration is normally the same for all frames, and the pts is incrementing. Other issues: Each audio packet has multiple audio frames. According to the following post, "you can have 1024 (or 960) frames per packet". WebApr 12, 2024 · Override teletext packet PTS and DTS values with the timestamps calculated from the PCR of the first program which the teletext stream is part of and is not discarded. Default value is 1, set this option to 0 if you want your teletext packet PTS and DTS values untouched. ... Set the input video size. This value must be specified … difference between minn kota maxxum and edge
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WebAug 18, 2024 · I do not have much idea about time stamp concept as I have recently started working on using FFMPEG. This call "av_packet_rescale_ts(pkt, *time_base, st->time_base);" is used on encoded packet just after frame is encoded. The second parameter to it i.e *time_base its time_base.den value is equal to 25 which is equal to … WebFeb 17, 2024 · FFmpeg returns negative PTS and DTS for first non key frame. We have some envelope of FFmpeg, that processes the video. The tree first frames of video are: B -> B -> I as shown below: We have some code, that skips the frames that are below some timepoint (0 for first frame). WebJan 15, 2016 · Jan 15, 2016 at 13:47. I have found at least a partial solution by looking at what ffmpeg does. It seems to set the output frame dts to the input frame number i.e. outputFrame->pts = frame_count; This at least creates a video of the right duration and the right frame rate although I get a lot of these errors in the debug output "Delay between ... forktail swallow