audio: remove initial decoding retry limitation

Seems useless.

This only helped in one case: one audio stream in the sample
av_find_best_stream_fails.ts had a AC3 packets which couldn't be
decoded, and for which avcodec_decode_audio4() returned 0 forever. In
this specific case, playback will now not start, and you have to
deselect audio manually.

(If someone complains, the old behavior might be restored, but
differently.)

Also remove the stale "bitrate" field.

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