Set the caps right after allocation of the buffer because we know the buffer is
writable then and we are correctly negotiated. Since ffmpeg keeps around
references to frames, making the buffer metadata writable where it was done
before pushing will always end up with a copy and that makes the sink do a slow
memcpy all the time.
FFMpeg parsing and decoding calls require to additionally allocate bytes
at the end of the input bitstream and this padding must be initialized
to zero.
https://bugzilla.gnome.org/show_bug.cgi?id=595590
Sometimes the parser loses track of timestamps and starts to reuse old
timestamp. Feed it some dummy data and clear some context variables to work
around the problem.
When estimating the frame duration, the diff between two incomming timestamps
should be scaled by the amount of frames in the interval. Improves duration
estimation and DTS interpolation.
Use the diff between input timestamps to estimate the duration when no duration
is set on input buffers. Only do this when there are no reordered input
timestamps. Improves interpolation in DTS mode when no input duration is set.
When we flush the parser cache, we only need to clear the bytes of the cache,
not the complete state of the cache. In the case of H264 this doesn't require
the parser to receive a new SPS/PPS after a DISCONT buffer.
Add function to reset the timestamp tracking.
Check for reordered timestamps on the input buffers and assume PTS input
timestamps when we see reordered timestamps.
Recover from an occasionally wrong input timestamp by also tracking the output
timestamps. When we detect a reordered output timestamp, assume DTS input
timestamps again.
Fixes#611500
The buffer durations were not being reordered along with the timestamp
and offset of the buffers, resulting in buffers using the duration of the
latest incoming frame instead of their original frame.
Fixes#611398
When we have an input width/height that should be used for clipping, only
perform the clipping if the rectangle is smaller than the actual picture size.
Fixes#330681
Make check for vdpau decoders more generic. There might be vdpau
decoders we don't expect when using an external ffmpeg version,
and we want those blacklisted as well (e.g. ffdec_mpeg4_vdpau).
Resetting default values is currently very complex in libavcodec, so
we only call it when needed (i.e. when a context was previously used).
Shaves off 10% of the setup of a decoder.
When we are dropping frames because of QoS disable the DTS interpolation because
we won't be able to update the timestamps and end up setting the wrong
timestamps. Instead, simply use the timestamps from ffmpeg.
