Keep the code as similar as possible across the codepaths to
ease spotting it for factorization.

Based on a patch from Michael Niedermayer <michaelni@gmx.at>.

The code currently set the information in at least 4 places, spare
some pointless loops.

Make the code in the loop a little uniform to make easier factorize
it out later.

CC: libav-stable@libav.org
Bug-Id: CID 1251347

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

CC: libav-stable@libav.org
Bug-Id: CID 1245699 / CID 1245700

This makes sure that the internal utf8 path names are handled
properly - the normal file handling functions assume path names
are in the native codepage, which isn't utf8.

This assumes that the tools outside of lavf don't use the mkdir
definition. (The tools don't do the same reading of command line
parameters as wchar either - they probably won't handle all possible
unicode file parameters properly, but at least work more predictably
if no utf8/wchar conversion is involved.)

This is moved further down in os_support.h, since windows.h shouldn't
be included before winsock2.h, while io.h needs to be included before
the manual defines for lseek functions.
Signed-off-by: Martin Storsjö <martin@martin.st>

On windows, rename(2) will fail if the target file exists. On
unix this trick is used to make sure that people reading the file
either will get the full previous file, or the full new version
of the file, but no intermediate version.
Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Martin Storsjö <martin@martin.st>

This makes sure that segments actually start at a keyframe (and
makes sure we don't split segments twice in a row, with one segment
consisting of only a handful of packets), when one stream uses b-frames
while another one doesn't.
Signed-off-by: Martin Storsjö <martin@martin.st>

This fixes playback with dash.js, when the input is one separate
mp4 file per track.
Signed-off-by: Martin Storsjö <martin@martin.st>

Fixes a wordly warning from clang -Wsometimes-uninitialized.

Prevent NULL dereference.

CC: libav-stable@libav.org
Bug-Id: CID 703669
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

'ret' can only be used without initialization if s->height <= 0, which can
only happen if avctx->height <= 0, which is validated elsewhere. Doesn't hurt
to still initialize it though.

CC: libav-stable@libav.org
Bug-Id: CID 732296

At least 8 bytes are needed (Mono audio).

Bug-Id: CID 741418
CC: libav-stable@libav.org

Bug-Id: CID 1238993

Also move the check in the case it is actually used.

CC: libav-stable@libav.org
Bug-Id: CID 1087090

CC: libav-stable@libav.org
Bug-Id: CID 29261

CC: libav-stable@libav.org
Bug-Id: CID 700556 / CID 700557 / CID 700558

Don't write any bitrate attribute if it isn't known. As long as one
doesn't want automatic bitrate switching, playback can work just
fine even if it isn't set.

If strict standard compliance is requested, this is still considered
an error, since the attribute is mandatory according to the spec.

Based on a patch by Rodger Combs.
Signed-off-by: Martin Storsjö <martin@martin.st>

The same file already includes this header a few lines further
above.
Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

CC: libav-stable@libav.org
Bug-Id: CID 700555

And use a macro to make apparent why the value.

Bug-Id: CID 1108595

CC: libav-stable@libav.org
Bug-Id: CID 1198262

CC: libav-stable@libav.org
Bug-Id: CID 1250330 / CID 1250335

CC: libav-stable@libav.org
Bug-Id: CID 1250334

CC: libav-stable@libav.org
Bug-Id: CID 1087092

This makes sure the default behaviour of using the internal encoder
stays the same regardless if libtwolame is enabled or not (as for
any external library).

This fixes fate-lavf-mpg if libav is built with libtwolame enabled.

CC: libav-stable@libav.org
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

The chained flv muxer wants one set of tags - normally this set
could be signaled via the AVOutputFormat codec_tag field (as
smoothstreamingenc and dashenc do). hdsenc doesn't signal it, since
the FLV codec tag arrays aren't exported from flvenc.c. This can
lead to the caller keeping an original codec tag from the originating
container here, which would then be a mismatch for the FLV muxer.
Since we don't really care about what codec tag the caller might
have set, just clear it and let the lavf muxer layer set the right
one for the chained FLV muxer later instead.
Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Martin Storsjö <martin@martin.st>

simd_align_16 is a configure item that can be enabled or disabled,
it's not a variable containing a list of other configure items
as need_memalign previously. This was broken in eba2233b.

CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>

CC: libav-stable@libav.org
Bug-Id: CID 717497

CC: libav-stable@libav.org
Bug-Id: CID 1194387 / CID 1194389 / CID 1194393 / CID 1206638

CC: libav-stable@libav.org
Bug-Id: CID 733795

Also prevent a NULL pointer dereference.

CC: libav-stable@libav.org
Bug-Id: CID 1250329 / CID 1250331

When given a stream starting at dts=0, it would previously consider
s->offset as uninitialized and set an offset when the second packet
was written, ending up writing two packets with dts=0. By initializing
this field to AV_NOPTS_VALUE, we make sure that we only initialize it
once, on the first packet.
Signed-off-by: Martin Storsjö <martin@martin.st>

This tool can write an MPD file for fragmented MP4 files with
a sidx index at the start of the file.
Signed-off-by: Martin Storsjö <martin@martin.st>

This is mapped to the faststart flag (which in this case
perhaps should be called "shift and write index at the
start of the file"), which for fragmented files will
write a sidx index at the start.

When segmenting DASH into files, there's usually one sidx
at the start of each segment (although it's not clear to me
whether that actually is necessary). When storing all of it
in one file, the MPD doesn't necessarily need to describe
the individual segments, but the offsets of the fragments can be
fetched from one large sidx atom at the start of the file. This
allows creating files for the DASH ISO BMFF on-demand profile.
Signed-off-by: Martin Storsjö <martin@martin.st>