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Topic: How to extract audio from MP4 (H.264/AAC) & MKV (VP9/Opus) without re-encoding? (Read 4373 times) previous topic - next topic
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How to extract audio from MP4 (H.264/AAC) & MKV (VP9/Opus) without re-encoding?

How to extract audio from MP4 (H.264/AAC) & MKV (VP9/Opus) without re-encoding? (100% lossless please)

Re: How to extract audio from MP4 (H.264/AAC) & MKV (VP9/Opus) without re-encoding?

Reply #1 –
ffmpeg -hide_banner -i input.mp4 -timestamp now -vn -c:a copy output.m4a
ffmpeg -hide_banner -i input.mkv -timestamp now -vn -c:a copy output.opus

Re: How to extract audio from MP4 (H.264/AAC) & MKV (VP9/Opus) without re-encoding?

Reply #2 –
Any pro FFmpeg GUI suggestion for Win x64?

Re: How to extract audio from MP4 (H.264/AAC) & MKV (VP9/Opus) without re-encoding?

Reply #3 –
Losslesscut

Re: How to extract audio from MP4 (H.264/AAC) & MKV (VP9/Opus) without re-encoding?

Reply #4 –
Quote from: shadowking on
Losslesscut

Can I losslessly extract audio from video with that app (100% lossless demuxing)?

Re: How to extract audio from MP4 (H.264/AAC) & MKV (VP9/Opus) without re-encoding?

Reply #7 –
what do the errors say?

also, if you click the ? then at the very end of the page it says:

Quote from: losslesscut[/quote
LAST FFMPEG COMMANDS
The last executed ffmpeg commands will show up here after you run operations. You can copy them to clipboard and modify them to your needs before running on your command line.

This command might be useful in establishing whether or not it's an ffmeg issue, a losslesscut issue or the media file you're providing it with.

Also, if you read about the program all it does is provide a GUI/frontend for ffmpeg.

Re: How to extract audio from MP4 (H.264/AAC) & MKV (VP9/Opus) without re-encoding?

Reply #8 –
Quote from: jaybeee on
what do the errors say?

also, if you click the ? then at the very end of the page it says:

Quote from: losslesscut[/quote
LAST FFMPEG COMMANDS
The last executed ffmpeg commands will show up here after you run operations. You can copy them to clipboard and modify them to your needs before running on your command line.

This command might be useful in establishing whether or not it's an ffmeg issue, a losslesscut issue or the media file you're providing it with.

Also, if you read about the program all it does is provide a GUI/frontend for ffmpeg.

Could you please write a tutorial: how to 100% losslessy remux?

Re: How to extract audio from MP4 (H.264/AAC) & MKV (VP9/Opus) without re-encoding?

Reply #9 –
Its been a while since I've had the need to extract from a container, but I think MKV Extract can do what you're wanting.

Re: How to extract audio from MP4 (H.264/AAC) & MKV (VP9/Opus) without re-encoding?

Reply #10 –
Quote from: clintb on
Its been a while since I've had the need to extract from a container, but I think MKV Extract can do what you're wanting.

Does it support MP4?

Re: How to extract audio from MP4 (H.264/AAC) & MKV (VP9/Opus) without re-encoding?

Reply #11 –
MP4: Load file into losslesscut > click Tracks > click on the tracks to disable them leaving only the audio track you want > Export > Select ipod - M4A - Audio for iTunes > Export

MKV: Load file into losslesscut > click Tracks > click on the tracks to disable them leaving only the audio track you want > Export > Select opus - Ogg Vorbis > Export
 

Re: How to extract audio from MP4 (H.264/AAC) & MKV (VP9/Opus) without re-encoding?

Reply #12 –
Quote from: jaybeee on
MP4: Load file into losslesscut > click Tracks > click on the tracks to disable them leaving only the audio track you want > Export > Select ipod - M4A - Audio for iTunes > Export

MKV: Load file into losslesscut > click Tracks > click on the tracks to disable them leaving only the audio track you want > Export > Select opus - Ogg Vorbis > Export

Thank you so much.