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Compressing to MP4 without losing multitrack audio

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Stephen Ratkovich
Compressing to MP4 without losing multitrack audio
on Mar 21, 2019 at 2:12:44 pm

Hi,

I have source MP4 files that have 3 distinct audio tracks.
Track 0 = H264, AVC1, 709 color
Track 1 = track 2 and 3 mixed together, AAC, 16 kHz, 32 bps
Track 2 = audio from mic 1, AAC, 16 kHz, 32 bps
Track 3 = audio from mic 2, AAC, 16 kHz, 32 bps
If you open up one of the source files in VLC or QuickTime 7 Pro, you can see in the media info/movie properties that track 1 plays by default in both the left and right channels.
You can then select which track to listen to (solo).

I want to trim these MP4s and then export with settings as close to the source as possible.
I've tried exporting through QT7Pro, Compressor, and Adobe Premiere Pro/Media Encoder and the resulting file always loses the multitrack, which I'm guessing either means track 2 and 3 are ignored or mixed down.
I've tried the following to no avail:
https://forums.creativecow.net/thread/3/972763
https://revuptech.com/content/blog-guest-/exporting-multichannel-quicktimes...
• setting track 1 to center, track 2 to left, track 3 to right in CLR
• setting each of the tracks in Compressor as mono; 1 discrete channel; discrete-0, discrete-1, discrete-2; mono, 1 discrete channel (t2 & t3)

I will not contact the originator of the source files for... reasons.
I can see there is promise in choosing uncompressed audio with a QuickTime/MOV codec/wrapper, but would like to avoid it if possible.
What can I do to just save a trimmed version of the source in its native settings without losing the multitrack audio?


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Craig Seeman
Re: Compressing to MP4 without losing multitrack audio
on Mar 21, 2019 at 3:25:25 pm

You might be able to trim them in Telestream Switch
Otherwise, I assume any good NLE will do this but perhaps Media Encoder doesn't handle it?



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Michael McIntyre
Re: Compressing to MP4 without losing multitrack audio
on Mar 21, 2019 at 7:17:34 pm

Another vote for Telestream Switch. I had similar needs for keeping audio tracks intact and it is great. While you won't be able to set up a batch of multiple files, it'll definitely pass-through the audio and trimming is also an option.


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