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Sur d’autres sites (9537)

  • Why does Google Chrome not play one of my mp4 files with H.264 codec, while Firefox does ?

    23 mai 2023, par Paul Levy

    I have two mp4, both with H.264 codecs. One plays in Chrome (I didn't create it) and the other downloads and plays in my computer's video player rather than in-browser. Both play completely fine in Firefox. I've searched and cannot understand how to make it work in Chrome (Version 113.0.5672.126 on Mac). I'm writing the videos with ffmpeg version 4.3.6-0.

    


    Here are the selected ffprobe outputs for the two videos (the first doesn't play in Chrome, the second does) :

    


    


    Video : h264 (Main) (avc1 / 0x31637661), yuv420p(progressive), 2880x960, 1684 kb/s, 100 fps, 100 tbr, 12800 tbn (default)

    


    


    


    Video : h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 240x426 [SAR 1:1 DAR 40:71], 20 kb/s, 29.97 fps, 29.97 tbr, 30k tbn (default)

    


    


    I'm creating the first video with the following flags (merging the audio has no impact) :

    


    ffmpeg -i VIDEO -i AUDIO -c:v copy -af aresample=async=1:first_pts=0 -loglevel error -vcodec libx264 -profile:v main -preset medium -movflags +faststart -pix_fmt yuv420p -y OUTPUT


    


    where I create VIDEO by merging 3 videos horizontally with :

    


    ffmpeg -i VIDEO_1 -i VIDEO_2 -i VIDEO_3 -filter_complex hstack=inputs=3 -loglevel error -vcodec libx264 -profile:v main -preset medium -movflags +faststart -pix_fmt yuv420p -y VIDEO


    


  • Revision fe0c09c2aa : Reduce the frequency of partition size adjsutment The commit change to use part

    25 février 2014, par Yaowu Xu

    Changed Paths :
     Modify /vp9/encoder/vp9_onyx_if.c



    Reduce the frequency of partition size adjsutment

    The commit change to use partitions sizes directly from last frame
    for frames directly where last frame selects partitions sizes based
    on coding efficiency.

    On —rt —cpu-used=-5, the change hurts compression by 4% but reduces
    encoding time by 20%

    Change-Id : Ia68665e5c8489b7bfcf5fac7768332fba88928e6

  • Split video stream with FFmpeg and play part with FFplay [closed]

    22 mars 2024, par Jan Hein

    I have a video stream send with FFmpeg to a other computer on my local network.
At the receiver computer I want to split the video stream in multiple parts and play them at the receiver computer. How can I do that ?

    


    Example :
Stream send form sender to receiver is 1000x1000 pixels.
At the receiver split the 1000x1000 pixel stream into four parts of 500x500 pixels, and play them all four on the receiver in a separate player.

    


    I have tryed it with a multicast stream to the receiver, and played it four times with FFplay, but that was not working correct.

    


    I also hve looked for multiple outputs with FFmpeg and then multiple pipes to FFplay, but could not find a solution.

    


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