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Sur d’autres sites (8581)

  • convert video to audio using ffmpeg

    5 mai 2024, par shakti goyal

    I'm trying to convert a video to mp3 using ffmpeg library but ffmpeg command is not working, it is returning the code 1

    


    Video conversion to MP3 failed with return code : 1

    


    try {
  final session = await FFmpegKit.execute('-i $videoFilePath -vn -ar 44100 -ac 2 -b:a 192k -f mp3 $audioFilePath');

  final returnCode = await session.getReturnCode();

  if (ReturnCode.isSuccess(returnCode)) {
    print('Video conversion to MP3 successful!');
  } else {
    print('Video conversion to MP3 failed with return code: $returnCode');
  }
} catch (e) {
  print('Error occurred during video conversion: $e');
}


    


    $videoFilePath - /Users/shaktigoyal/Library/Developer/CoreSimulator/Devices/9D514AC1-E245-4360-B876-745B9527B844/data/Containers/Data/Application/091D48E6-3AE4-4867-B3B2-2034854D27CE/tmp/image_picker_3DA6CDD3-C2F9-4313-98A1-40A7B0AED652-1298-00001B041C9F94E4trim.59BC5143-1EBA-4BB0-955C-EA1942FA56E3.MOV

    


    $audioFilePath - /Users/shaktigoyal/Library/Developer/CoreSimulator/Devices/9D514AC1-E245-4360-B876-745B9527B844/data/Containers/Data/Application/091D48E6-3AE4-4867-B3B2-2034854D27CE/Documents/audio-14.mp3

    


  • ffmpeg : combine two or three audios into one by lowering the volume of the other

    15 juin 2016, par somya bhargava

    Want to combine some audio files eg :

    1) one long audio file which will act as a background audio
    2) some audio files which will be replaced at specific intervals
    like at 10 sec of the first one

    So final output required is
    audio-1 60 sec
    audio-2 starting from 10 sec to 20 sec with audio-1 at 0.1 volume

  • Append two videos without duplicating FFMPEG

    10 septembre 2021, par Hasindu Lanka

    Let's say we have 2 video files (X,Y) in the same format, codec and dimensions.

    


    X is a longer video with several gigabytes in size. Y is a short 10 second video. I want to append Y to the end of X without creating another copy of X (Because it's big in size)

    


    I have to repeat this process for hours with many 10 second videos arriving one after another.

    


    Currently, I'm concatenating files using ffmpeg.

    


    ffmpeg -f concat -safe 0 -i chunk.list -c copy final-video.mkv

    


    chunk.list contains file names of X and several 10 second videos. After this, X will be deleted and replaced by final-video.mkv. Then, repeat.

    


    But this needs twice the storage capacity and I/O operations. How to do this without creating duplicates ?

    


    It's okay to duplicate these 10 second videos. But duplicating that bigger file X really hurts performance.

    


    Additional info :

    


    All these videos will be encoded with H264, H265, VP8 or VP9 and contained in MKV or MP4 as they are codec copy friendly. Only one of these formats will be used.

    


    This is for a special case screen recorder that's supposed to run on cloud and preemptive remote desktops (Linux).
HTML/JS browser front-end captures the screen and sends to the back-end (Golang) as chunks through HTTP. Network route is undefined and unreliable as there can be firewalls/proxies between the front-end and the back-end. Therefore, we can't use connections like UDP. So the only option is to send video chunks using HTTP.

    


    It's FOSS on https://github.com/HasinduLanka/screencorder

    


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