Avoid using an intermediate register
Support fallback mixing to original bitdepth with old channel count.
Drop corrupted AC3 frames with a different audio channel layout.

This is most likely an indicator of a serious audio glitch and can cause
playback interruption due to the channel layout change.
Support MP4 H264 files with avcC atoms without any SPS/PPS.
Update ffmpeg for loading deadlock
Installer: Backup Source Filter mappings and restore on uninstall.
Update ffmpeg for lockmgr fix
Validate string position before using the index.