movenc: Use keyframes as default fragmentation point in ismv

Fragmenting blindly to a certain duration isn't a good choice
if one should be able to switch between different qualities,
therefore default to keyframes instead.

Signed-off-by: Martin Storsjö <martin@martin.st>
wnv1: Make sure the input packet is large enough

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
vc1dec: Fix leaks in ff_vc1_decode_init_alloc_tables on errors

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
vc1dec: Undo mpegvideo initialization if unable to allocate tables

Previously, s->context_initialized was left set to 1
if ff_vc1_decode_init_alloc_tables failed, skipping the
initialization completely on the next decode call.

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
vc1dec: Make sure last_picture is initialized in vc1_decode_skip_blocks

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
vc1dec: Don't decode slices when the latest slice header failed to decode

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
lavf: Avoid setting avg_frame_rate if delta_dts is negative

This avoids setting avg_frame_rate to invalid (negative)
values.

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
electronicarts: Check packet sizes before reading

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
vc1dec: Check the error handling flags on slice/field header decode errors

Signed-off-by: Martin Storsjö <martin@martin.st>
movenc: Return a proper error code for invalid combinations

Signed-off-by: Martin Storsjö <martin@martin.st>
movenchint: Clear size and len if the realloc failed

Previously these were left in an inconsistent state.

Pointed out by Michael Niedermayer.

Signed-off-by: Martin Storsjö <martin@martin.st>
lavfi: add an API to synchronize multiple video inputs.

Compared to dualinput, this API can handle more than two
inputs and can generate frames synchronized to any or all
input streams.
lavfi/dualinput: reimplement on top of framesync.
Merge commit 'f1eac2b8a0370b908cd691086d11f51342054730'

* commit 'f1eac2b8a0370b908cd691086d11f51342054730':
  movenc: Use keyframes as default fragmentation point in ismv

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '91be1103fd1f79d381edf268c32f4166b6c3b6d8'

* commit '91be1103fd1f79d381edf268c32f4166b6c3b6d8':
  wnv1: Make sure the input packet is large enough

Conflicts:
	libavcodec/wnv1.c

See: f23a2418fb0ccc56fdae4dbf83a5994cc917c475
Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit 'ede508443e4bf57dc1e019fac81bf6244b88fbd3'

* commit 'ede508443e4bf57dc1e019fac81bf6244b88fbd3':
  vc1dec: Fix leaks in ff_vc1_decode_init_alloc_tables on errors

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit 'b772b0e28eba6abf76d86ee8c6e459a86642db5a'

* commit 'b772b0e28eba6abf76d86ee8c6e459a86642db5a':
  vc1dec: Undo mpegvideo initialization if unable to allocate tables

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '5e25fdbfe01635cfc650ac4adc27d434b2df0d64'

* commit '5e25fdbfe01635cfc650ac4adc27d434b2df0d64':
  vc1dec: Make sure last_picture is initialized in vc1_decode_skip_blocks

See: 09de0ffeab37442d1a31ee194ea6d78a67186de1
Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit 'bb7bf175951475235ee7d0504198c4a30cf5d5dd'

* commit 'bb7bf175951475235ee7d0504198c4a30cf5d5dd':
  vc1dec: Don't decode slices when the latest slice header failed to decode

Conflicts:
	libavcodec/vc1dec.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
ffprobe: fix uninitialized variable warning

Fix warning:
ffprobe.c:1684:21: warning: ‘start’ may be used uninitialized in this function [-Wmaybe-uninitialized] end = start + interval->end;

The warning is a false positive, since the variable is accessed only if
has_start is set, and in that case start has been already set.