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  • Adding current time as timestamp in h264 raw stream with few frames

    1er avril 2020, par Michaël

    I have a program that spits out an h264 raw stream (namely, screenrecord on Android). I'm using ffmpeg to add a PTS (Presentation Time Stamp) on the frames as follows :

    



    $ my-program | ffmpeg -i - -filter:v setpts='(RTCTIME - RTCSTART) / (TB * 1000000)' out.mp4


    



    This filter computes the current time, and puts it as the PTS.

    



    The trouble is that my-program does not produce any output if there is no change in the video. Since ffmpeg seems to wait for a bunch of frames before putting them through the setpts filter, the computed PTS won't be correct. In particular, the last frame of a sequence will be timestamped when the next sequence starts.

    



    Question : Is there a way (with ffmpeg or otherwise) to add current time as PTS to h264 raw frames, where "current time" is when receiving the frame, rather than outputting it ?

    



    Note : The problem is not from buffering from the pipe.

    


  • Convert AVStream PTS value to real time in seconds

    15 janvier 2015, par Kamlesh

    The below code snippet gets the PTS value of different frames from a video file

    AVStream *stream = avctx->streams[avpkt.stream_index];
    
if ( 0 > ( err = avcodec_decode_video2 ( stream->codec, frame, &got_frame, &avpkt ) && got_frame ) )
    
{
    
    int64_t pts = av_frame_get_best_effort_timestamp ( frame );
    
    pts = av_rescale_q ( pts,  stream->time_base, AV_TIME_BASE_Q );        
    
}

    The PTS value that it returns are given below.

    • 66733
    • 100100
    • 133467

    Confusion is on the time format of the above values, whether they are in milliseconds or microseconds.
    Is there any other way to get a real time PTS values of the frames, as these will be required for subtitle rendering

  • ffmpeg - Cannot seem to calculate the -vstats time parameter to seconds

    15 octobre 2014, par javisrk

    So I’m using C# in conjunction with FFMpeg, and I’m trying to obtain progress of a video extraction. I have the command line :

    ffmpeg.exe -y -i C:\test\2222@20140115085852-2.mpg -ss 00:01:30 -to 00:03:40 C:\test\2222@20140115085852-21.mpg -vstats_file "C:\test\log.txt"

    Sample lines from log.txt :

    frame=  7740 q= 31.0 f_size=    381 s_size=    14723kB time= 194600.000 br=   182.9kbits/s avg_br=     0.6kbits/s type= P
    
frame=  7740 q= 31.0 f_size=    123 s_size=    14724kB time= 194625.000 br=    59.0kbits/s avg_br=     0.6kbits/s type= P
    
frame=  7740 q= 31.0 f_size=    381 s_size=    14724kB time= 194650.000 br=   182.9kbits/s avg_br=     0.6kbits/s type= P

    From the command line, I know that I’m extracting 2 minutes, 10 seconds (or 130 seconds) of video from the original file. How can I use the time parameter to help me calculate the amount of seconds ffmpeg has encoded so far ?

    EDIT : Based on some research, time is measured in PTS. How can I convert that into seconds ?

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