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Sur d’autres sites (7848)

  • Revision 225 : Fixed file offset when checking for data tags overflows. Fixed flv file dump sto

    21 avril 2011, par marc.noirot

    Changed Paths :
     Modify /trunk/src/check.c


     Modify /trunk/src/flv.c



    Fixed file offset when checking for data tags overflows.
    Fixed flv file dump stopping when encountering an empty tag body.

  • ffmpeg recompressing a mkv file with subtitles without default value, the new file got a default subtitle

    22 novembre 2022, par Tonic8

    on some file i need to recompress files using ffmpeg, i want the encoding on the video, but have all audio and all subtitles just copied with the same properties.

    


    it seems if there are subitile, without default value, in the original mkv file, it will generate the new file with the first subtitle with "default" value.
If the original file had subtitles with already default value, then FFMPEG won't change anything

    


    .\ffmpeg.exe" -nostats -hwaccel cuda -i ".\toto.mkv" -n -c:v h264_nvenc -preset slow -crf 22 -c:a copy -c:s copy -map 0:v -map 0:a -map 0:s? ".\toto_recompressed.mkv"

    


    does my comand line is adding this behaviour, or i missing a paramter ?

    


    i'm expecting to have ffmpeg not touch and simply "copy" the actual subtitles properties without modifying them.

    


  • FFMPEG : Appending an audio file at a specified time in a video file with pre-existing audio results in no addition [duplicate]

    15 juin 2020, par JarsOfJam-Scheduler

    I have a video that contains images and a pre-existing audio.

    



    I have an audio file of a duration Y that I would want to start in this video, after 5 seconds. It must no replace the audio during these Y seconds, but be appended. As a result I should hear both audio during these Y seconds.

    



    What I've try to do is :

    



    ffmpeg -i the_video.webm -itsoffset 5 -i the_audio_file.mp3 -map 0 -map 1 -c:v copy resulting_video_with_both_audio.webm

    



    So it should add the_audio_file.mp3 after 5 seconds. It should take all the streams of the video file, and all the streams of the new audio file, and mix it.

    



    However my problem is that I only hear the audio of the video. I don't hear, indeed, the new audio at all. I should hear, during the first 5 seconds, the audio of the video. Then after 5 seconds, the audio of the video PLUS the Y seconds of the new audio file. Then after these Y seconds, the audio of the video until the end of the video.

    



    Do you know how to fix this bug ? Why doesn't this command work ? Please I would prefer an answer that doesn't use -filter (because this command'll be executed in a Python script).

    


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