Both options tweak FFmpeg for the sake of decoding speed. The first one
skips the loop filter for certain frames while the latter allows FFmpeg
to violate the codec's specification. Both options may lead to artefacts.

--HG--
extra : transplant_source : %15%CD%0B%2C%F2g%03%B9%25%D4%B2%8BQ%1F%EB%BB%8F%28%9B%C8

Compilation was "broken" by ffmpeg rev. 9283.

--HG--
extra : transplant_source : %E0%D0%C5%8B%BEU%DD%24%5D7%1F%ADV%AD%EB%23%CBU%80%EB

For H.264 content, VO_INTERLACED_FLAG must be set all the time and not only
for interlaced frames. Frames should be allocated so that size is a multiple
of a marcoblock (16x16). Any excess pixels are cropped away. top_field_first
and progressive_frame can be transferred always, not just in demux_mpeg_pes
context. But for bad frames it doesn't make sense to transfer those fields
as the information would be from the previous frame and could be incorrect
for the current frame. Thus, the workaround for demux_mpeg_pes cannot rely
on these fields either and needs to use a separate variable to detect fields
being sent as frames.

--HG--
extra : transplant_source : %A8%25%B9I%A4%5B%E5%AE%DD%EF_c%E35%CBSRn%22%A4

For contributed code, leave whatever the version we last synced for is using
to make simpler future syncs.