[Dave Johnston]

Appreciate all the help Reuben!

This seems to take the 14 channel stream and copy it to 14 streams with 14 channels in the output file. I’ve tried various permutations and additions to this but i’m not sure i’m not hitting a limitation of FFMPEG here.

I can only assume it’s possible in a one-liner as, if there were a channel_layout with 14 channels, then I could use that.

Very frustrating! 🙂

[Dave Johnston]

Thanks Reuben, the only reason I referred to them as ‘tracks’ as that is the Quicktime nomenclature.

The example you provided would work however FFMPEG has in built channel_layout definitions, none of which go upto 14 channels.

Still having no luck with this. Only solution thus far seems to be a mixture of splitting out a WAV with ffmpeg, mixing it out to 14 seperate WAVs with ‘sox’ then re-muxing it back in with FFMPEG.

[Dave Johnston]

For reference, this is the stream layout :

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
‘file.mov’:
Metadata:
creation_time : 2012-10-09 15:11:39
Duration: 00:03:18.52, start: 0.000000, bitrate: 133624 kb/s
Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le,
1920×1080, 122869 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
Metadata:
creation_time : 2012-10-09 15:11:39
handler_name : ?Linux Alias Data Handler
Stream #0:1(eng): Audio: pcm_s16be (lpcm / 0x6D63706C), 48000 Hz, 14
channels, s16, 10752 kb/s
Metadata:
creation_time : 2012-10-09 15:11:39
handler_name : ?Linux Alias Data Handler
Stream #0:2(eng): Data: none (tmcd / 0x64636D74)
Metadata:
creation_time : 2012-10-09 15:11:53
handler_name : $Libquicktime Time Code Media Handler
timecode : 09:59:10:00

[Dave Johnston]

Hi Michael,

That’s great, certainly one step closer.

Is there any way to, without exporting, take the individual streams/channels and route them into seperate audio tracks within ffmpeg?

So something like

In File > FFMPEG (taking 14 streams into 14 tracks) > out file

Thanks again!
D

[Dave Johnston]

Hi all,

Sorry, I should have been clearer.

The file in question is a Quicktime (ProRes 422 HQ) with one track Video, one track Sound and one track TC. It’s been exported from a professional colour grading system.

The Audio is 48khz, 6-bit linear pcm, 14 channels within the single sound track (identified as ‘mono’ channels within Quicktime.

I’m trying to split them out to 14 discete tracks.

I had a look at -filter_complex and -asplit but couldn’t find anything to do the job.

Any help is greatly appreciated!

D