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isomp4: Fix (E)AC-3 channel count handling

Jan Alexander Steffens requested to merge heftig/gstreamer:isomp4-ac3-channels into main

The muxer used a fixed value of 2 channels because the TR 102 366 spec says they're to be ignored. However, the demuxer still trusted them, resulting in bad caps.

Make the muxer fill in the correct channel count anyway (FFmpeg already does) and make the demuxer ignore the value.

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