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When the furthest-behind stream is being fed by a demuxer that is also feeding packets to a choked filter graph, we need to unchoke that filter graph to prevent the demuxer from getting stuck trying to write packets to the choked filter graph. This situation can also apply recursively - if the demuxer is also writing to a filtergraph that is also reading from a choked demuxer, there is a similar deadlock. Solve all such deadlocks by just brute-force recursively unchoking all nodes that can somehow prevent this demuxer from writing packets. This should normally not result in any change in behavior, unless audio/video streams are badly desynchronized, in which case it may result in extra memory usage from the too-far-ahead stream buffering packets inside the muxer. (But this is, of course, preferable to a deadlock) Fixes: https://code.ffmpeg.org/FFmpeg/FFmpeg/issues/20611