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Description of problem or question:
I would like to encode mxf or .mov) multichanel audio tracks with 5.1 AND downmix Left/Right on tracks 7 and 8
to make a Stereo mp4 for Vimeo (for exemple) But Handbrake detect only one pcm track 7.1!! (but it's not!)
How can chose ONLY audio channel 7 and 8 for making a stereo mp4?
Steps to reproduce the problem (If Applicable):
HandBrake version (e.g., 1.0.0):
1.3.2 pc
Operating system and version (e.g., Ubuntu 16.04 LTS, macOS 10.13 High Sierra, Windows 10 Creators Update):
Windows 10 Pro
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IIRC the problem is the MXF has 8 individual mono tracks/channels and no way to identify the mapping.
You can probably manually specify the mapping using a command line tool like FFmpeg but it will be cumbersome to do.
If possible, rendering a stereo only version is probably easiest. You might also try remuxing using MKVToolNix, which might allow you to drop channels (not entirely sure).