Code submissions have continually suffered from formatting
inconsistencies that constantly have to be addressed. Using
clang-format simplifies this by making code formatting more consistent,
and allows automation of the code formatting so that maintainers can
focus more on the code itself instead of code formatting.
(Also modifies obs-ffmpeg to handle empty frames on EOF)
Previously the demuxer could hit EOF before the decoder threads are
finished, resulting in truncated output. In the worse case scenario the
demuxer could read small files before ff_decoder_refresh even has a chance
to start the clocks, resulting in no output at all.
Certain input streams (such as remote streams that are already active)
can start up mid-stream with a very high initial timestamp values.
Because of this, it would cause the libff timer to delay for that
initial timestamp, which often would cause it to not render at all
because it was stuck waiting.
To fix the problem, we should ignore the timestamp difference of the
first frame when it's above a certain threshold.
Now that we're using the timestamps from the stream for playback,
certain types of streams and certain file formats will not start from a
pts of 0. This causes the start of the playback to be delayed. This
code simply ensures that there's no delay on startup. This is basically
the same code as used in FFmpeg itself for handling this situation.
This lets the decoder make decisions based on whether it is a hardware decoder or not. Specifically, hardware decoders are more strict as to which frames can be dropped in an h264 stream.
