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Sur d’autres sites (3994)

  • Merge .mkv files with already included subtitles using ffmpeg-python

    9 mars 2023, par Eeshe

    I'm trying to merge two (and more in the future) .mkv files that already have subtitles included in them, this means I DO NOT have .srt files that need to be encoded. Let's call the .mkv files intro.mkv and episode.mkv.

    


    However, the way I want to merge them is so a portion of the episode.mkv file is played until a specified timestamp, then intro.mkv plays completely, and after that the rest of episode.mkv.

    


    I've managed to get close with the following code.

    


    import ffmpeg

initial_episode_video = ffmpeg.input('episode.mkv', to='00:00:34.033', hwaccel='cuvid')
intro_video = ffmpeg.input('intro.mkv', hwaccel='cuvid')
remaining_episode_video = ffmpeg.input('episode.mkv', ss='00:00:34.033', hwaccel='cuvid')

full_episode_video = ffmpeg.concat(initial_episode_video, intro_video, remaining_episode_video)

output_video = ffmpeg.output(
    full_episode_video,
    filter_complex='[0:v][0:a][1:v][1:a][2:v][2:a]concat=n=3:v=1:a=1',
    vprofile='main', 
    vcodec='h264_nvenc',
    pix_fmt='yuv420p',
    crf=22,
    map="0:s",
    filename=f'Output/{episode_path}')
ffmpeg.run(output_video)


    


    With this code, the videos are correctly trimmed. The problem is that once intro.mkv starts playing, it doesn't show the subtitles corresponding to it, instead it shows the episode.mkv subtitles corresponding to the '00:00:34.033' timestamp.

    


    My objective is to display the subtitles of intro.mkv, and then, once the full intro is played, continue with the subtitles from episode.mkv.

    


    NOTE : I am aware that I am re-encoding both the episode.mkv and intro.mkv files. If possible, I'd prefer if it only re-encodes episode.mkv, since intro.mkv only needs to be re-encoded once (I can do that individually). I am re-encoding to go from H.264 Hi 10 to H.264 main profile.

    


  • Force x264 to encode all frames relative to the first (IDR) frame

    12 décembre 2019, par cloudraven

    I want to generate a h.264 stream in which P-frames are using references exclusively using a long-term reference to the first frame (an IDR frame). This would also require the first frame to be an IDR frame.

    



    This is an academic experiment to understand the encoding behavior of long-term references and the consequences of forcing frames to refer to a specific (single) frame rather than several.

    



    It would be great if I could do this from the command line, but if not possible I am open to modifying x264 for this purpose.

    



    Could anyone point me to where in the source code it is determined :

    



      

    • the reference frame / macroblock / partition for the current macroblock

      • 


    • changes made to the short term, long term reference frame list

      • 


    • whether to use a short term reference frame or a long term reference frame.

      • 


    



    Using another encoder like nvenc is also acceptable.

    


  • Force x264 to encode all frames relative to the first (IDR) frame

    12 décembre 2019, par cloudraven

    I want to generate a h.264 stream in which P-frames are using references exclusively using a long-term reference to the first frame (an IDR frame). This would also require the first frame to be an IDR frame.

    



    This is an academic experiment to understand the encoding behavior of long-term references and the consequences of forcing frames to refer to a specific (single) frame rather than several.

    



    It would be great if I could do this from the command line, but if not possible I am open to modifying x264 for this purpose.

    



    Could anyone point me to where in the source code it is determined :

    



      

    • the reference frame / macroblock / partition for the current macroblock

      • 


    • changes made to the short term, long term reference frame list

      • 


    • whether to use a short term reference frame or a long term reference frame.

      • 


    



    Using another encoder like nvenc is also acceptable.

    


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