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[3.0] avcodec: fill audio frame channel field

Alaric Senat requested to merge asenat/vlc:backport-ffmpeg-audio-fix into 3.0.x

Since ffmpeg 4.4 specifying channel layout or channel number is required to call avcodec_send_frame() without error. This is new requirement is due to a change in the avcodec internal API brought by 827d6fe73d2f5472c1c2128eb14fab6a4db29032 (ffmpeg repo). They now call av_frame_ref which needs the channels fields to be valid.

(cherry picked from commit 321a29b0)

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