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Sur d’autres sites (6374)

  • FFMPEG Concat Demuxer adds more time to video than expected

    5 septembre 2023, par Shreyas

    I am using ffmpeg concat demuxer to join multiple(189) videos together.
The videos are originally split from a single video using the following command :

    


    ffmpeg -ss time[2] -vsync 1 -copyts -i inputfile.mp4 -ss time[0] -to time[1] -c:a copy -c:v libx264 -b:v 800k output.mp4


    


    Thereafter I am using the following concat command :

    


    ffmpeg -f concat -safe 0 -i list.txt -c copy output.mp4


    


    The problem is that the sum of the lengths of the input videos is 24:03:520
The output.mp4 video comes out to be 24:05:550.
Which is two seconds longer than the constituent video length.

    


    I need the output video to be time accurate. How can I achieve this without reencoding the video ?

    


  • Php and Mysql current video time duration using FFMPEG

    10 novembre 2014, par innovation

    I have one question about video time calculator.

    I am using this FFMPEG

    shell_exec("ffmpeg -i ../videos/$video_name.flv -f flv -s 320x240 ../videos/$video_name.mp4");
    
shell_exec("ffmpeg -i ../video_images/$video_name.mp4 -vcodec png -ss 00:00:05 -s 360x288 -vframes 1 -an -f rawvideo ../video_images/$video_name.png");

    I want to add here to post total duration of the video.

    For example : I upload a video this video time 4:10 (4 minutes 10 seconds). I want to post it this time from table row.
    How can i do this anyone can tell me ?

  • Adding current time as timestamp in H.264 raw stream with few frames

    2 avril 2020, par Michaël

    I have a program that spits out an H.264 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 isn't any 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.

    



    Is there a way (with FFmpeg or otherwise) to add the current time as PTS to H.264 raw frames, where "current time" is when receiving the frame, rather than outputting it ?

    



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

    


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