[3.0] Fix AVI XVID Packed Bitstream jerky playback with HW decoders

Older DivX-encoded videos often use a method called packed bitstream, which combines several video frames into a single AVI chunk. This causes issues with some hardware decoders due to improper demuxing, where frames aren't correctly split into access units. Proper packetization is required to address this, as a single timestamp is incorrectly applied to multiple frames in the packed bitstream, leading to playback issues