Change the audio of a .mp4
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Hello /g/
Total noob here, I need your help.
I downloaded a 90 min .mp4 video (iykwim), but I'd like to change the audio. I read that I should convert it to mkv, then add the audio with something like Mvktoolnix.
What do you think? I don't want to lose the original video quality.
Thanks!
>>55608477
http://stackoverflow.com/questions/9446578/how-to-replace-audio-track-in-mkv-file-on-ubuntu-11-10
http://stackoverflow.com/questions/11779490/how-to-add-a-new-audio-not-mixing-into-a-video-using-ffmpeg
http://superuser.com/questions/800234/how-to-replace-an-audio-stream-in-a-video-file-with-multiple-audio-streams
You can get ffmpeg from here https://ffmpeg.zeranoe.com/builds/
Get the 64bit static build.
I hope you can use the command line.
>>55608630
Oh and, this is the last reply I'll make in this thread.
If you need to prepare your audio then use ffmpeg or whatever tools are available out there.
If you have it ready, then go with mkvtoolnix. You can try adjusting the delay of your input audio to match the video. This process is called "muxing" and it doesn't affect the quality of the streams at all.
And if you're using a version of mkvtoolnix superior to 4.8, you should add this in Output > Miscellaneous > Additional options: --engage no_cue_duration --engage no_cue_relative_position. It's for better time seeking with older devices.