Fixes#11898, some audio contained in pmf videos seem not be actually played by the games. current code prevents video from moving forward for waiting auido and sync, similar issue will happen.
Without doing this, FFmpeg will try to probe the streams to detect them
instead. When it does this, sometimes it tries to read beyond the data
that's available - and then gets confused by EOFs.
Parsing this way allows us to control the situation.
An example is Valkyrie Profile, corruption in the first frames of the
second video during the intro. Thi doesn't fix it yet, but now it's just
a matter of buffering.
They don't actually work in all games, and this only confuses users.
Also, the default 7 lowers the volume of audio detected as bgm or sfx, but
not other volume. This means that some audio may have played too loud in
some games by default, which will be fixed by this change.
Don't have any games actually using this, so let's report too. Audio is
falsely working when the stream isn't playable, not exactly sure the best
way to detect that.
This fixes#2226, thanks to @raven02 for finding the issue. Could also
help e.g. Xyanide: Resurrection and a few other games.
The video codec change path is not super well tested, because I couldn't
find a game that triggered it, but it should work.
