Recherche avancée

Sur d’autres sites (6373)

• FFmpeg - convert 2 audio tracks from video to 5.1 audio, (play video with different languages to different devices) [closed]

  10 février, par Sandre

  How to watch a movie with one language playing through the speakers and another through the headphones ?

  


  Disclaimer : I know nothing about audio conversion, and don't want to study ffmpeg. I spend a few hours searching how to do, actually much more than I want. I found a bunch of questions from different people and not a single working solution, so I made a clunky but working solution. If someone helps me make it more elegant, I'll be happy. If my question just gets downvoted like most ffmpeg newbie questions, it probably deserves it. And I hope my question can help people who want enjoy video with 2 different languages.

  


  A clumsy but working solution.

  


  


  1. Setup Aggregate Audio Device to play 2 channels of 5.1 through speakers and 2 through bluetooth headphones. (On screenshot Audio MIDI Setup for MacOS)


     


  


  2. Use ffmpeg to convert 2 audio tracks into 5.1 audio.

     


  


  3. Play video with new external audio track.

     


  


  


  # print list of channels
ffprobe INPUT.mkv 2>&1 >/dev/null | grep Stream

--- sample output ---
    Stream #0:0(eng): Video: h264 (High), yuv420p(progressive), 1280x544, SAR 1:1 DAR 40:17, 23.98 fps, 23.98 tbr, 1k tbn (default)
    Stream #0:1(rus): Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s (default)
    Stream #0:2(eng): Audio: ac3, 48000 Hz, 5.1(side), fltp, 640 kb/s

# extract audio
ffmpeg -i INPUT.mkv -map 0:1 -acodec copy ru.ac3
ffmpeg -i INPUT.mkv -map 0:2 -acodec copy en.ac3

# extract only front_center channel from 5.1 - speach
ffmpeg -i en.ac3 -filter_complex "channelsplit=channel_layout=5.1:channels=FC[center]" -map "[center]" en_front_center.wav
ffmpeg -i ru.ac3 -filter_complex "channelsplit=channel_layout=5.1:channels=FC[center]" -map "[center]" ru_front_center.wav

# join to 5.1
ffmpeg -i en_front_center.wav -i ru_front_center.wav -filter_complex "[0:a][0:a][0:a][0:a][1:a][1:a]join=inputs=6:channel_layout=5.1[a]" -map "[a]" output.wav


  


  Is it possible to avoid re-encoding the audio and copying the same channel many times to reduce the file size ?

  


• Play video with multiple audio tracks - different languages to separate devices

  8 février, par Sandre

  I want watch movie with my wife, listening to different audio channels - one language for me, another for my wife.

  


  I found solution and it works fine but not optimal.

  


  I know nothing about audio conversion, so asking to make it better.

  


  I'm using ffmpeg to combine separate stereo tracks to 5.1, then playing using IINA to Agregate device defined in Audio MIDI Setup (Speakers and bluetooth headphone). This for MacOS, but I'm pretty sure something similar will work for windows, taking in count IINA under hood use MPV.

  


  

  


  ffmpeg -i eng.mp3 -filter_complex "[0:a]channelsplit=channel_layout=stereo[left][right]" -map "[left]" en_left.wav -map "[right]" en_right.wav
ffmpeg -i ru.ac3 -filter_complex "[0:a]channelsplit=channel_layout=stereo[left][right]" -map "[left]" ru_left.wav -map "[right]" ru_right.wav

ffmpeg -i ru_left.wav -i ru_right.wav -i ru_left.wav -i ru_right.wav -i en_left.wav -i en_right.wav \
-filter_complex "[0:a][1:a][2:a][3:a][4:a][5:a]join=inputs=6:channel_layout=5.1[a]" -map "[a]" output.wav



  


  What I want to improve :

  


  

  1. I added 2 useless channels (2 and 3) - just a copy of 1 and 2.

  


  2. All tracks converted - probably it's possible just copy them ?

  


  3. Would be good to have possibility extract channels embedded into video.

  


  


• Remove audio from specific audio track

  9 août 2024, par Ronaldo Júdice

  I have this code, and i would like to remove audio from tracks 5 and 6. I had tried everything but is not working, I can mute the audio tracks but on edition program i can see the waves, can you help me ?

  


  if (conv.format === 'mxf') {
        // Add 8 audio tracks
        ffmpeg(inputFile)
            .audioCodec('pcm_s16le') // Codec de áudio para MXF
            .outputOptions([
                '-c:v mpeg2video', // Codec de vídeo para MXF
                '-q:v 2', // Qa  vídeo
                '-map 0:v:0', 
                '-map 0:a:0', 
                '-map 0:a:0',
                '-map 0:a:0', 
                '-map 0:a:0', 
                '-map 0:a:0', // this track i want to remove the audio but keep the track
                '-map 0:a:0', //this track i want to remove the audio but keep the track
                '-map 0:a:0', 
                '-map 0:a:0', 
                '-disposition:a:0 default' // Marcar trilha 1 como padrão
            ])
            .save(outputFile)
            .on('start', commandLine => console.log(`FFmpeg comando iniciado: ${commandLine}`))
            .on('progress', progress => console.log(`Progresso: ${progress.percent}%`))
            .on('end', () => console.log(`Conversão concluída: ${outputFile}`))
            .on('error', err => console.error(`Erro na conversão de ${inputFile} para ${outputFile}: ${err.message}`));
    } else {
        // Outras conversões
        ffmpeg(inputFile)
            .outputOptions(conv.options)
            .save(outputFile)
            .on('start', commandLine => console.log(`FFmpeg comando iniciado: ${commandLine}`))
            .on('progress', progress => console.log(`Progresso: ${progress.percent}%`))
            .on('end', () => console.log(`Conversão concluída: ${outputFile}`))
            .on('error', err => console.error(`Erro na conversão de ${inputFile} para ${outputFile}: ${err.message}`));
    }


  


  I tried to use ffmpeg comands to remove audio from track.