avserver: do not use a static string as a default for a string option

Fixes an invalid free.

Bug-id: 448
avconv: fix usage of deprecated lavfi API
lavfi/fifo: fix flushing when using request_samples

If any samples are still buffered when request_frame returns EOF, they
won't be returned currently.
avconv: insert extra filters in the same way for both graph inputs and outputs

This will allow using the same code when one filter can be inserted both
on input and output.
avconv: distinguish between -ss 0 and -ss not being used

Using -ss 0 to drop frames with negative timestamps is a perfectly valid
use case.
avconv: make input -ss accurate when transcoding

Insert (a)trim filters on the corresponding inputs, so the extra frames
are decoded and discarded.
avconv: support -t as an input option.

It limits the duration of the data read from a given input.
vdpau: remove old-style decoders

Signed-off-by: Anton Khirnov <anton@khirnov.net>
vdpau: deprecate old codec-specific pixel formats

Signed-off-by: Anton Khirnov <anton@khirnov.net>
vdpau: deprecate VDPAU codec capability

Signed-off-by: Anton Khirnov <anton@khirnov.net>
vdpau: store picture data in picture's rather than codec's context

Signed-off-by: Anton Khirnov <anton@khirnov.net>
vdpau: deprecate bitstream buffers within the hardware context

The bitstream buffers are now private and freed by libavcodec. For
backward compatibility, the hold bitstream buffer pointer is left NULL
(applications were supposed to av_freep() it).

Signed-off-by: Anton Khirnov <anton@khirnov.net>
ismindex: Replace mkdir ifdeffery by os_support.h #include

os_support.h contains more precise workarounds for non-POSIX mkdir().
build: Add missing img2.o dependency to apetag.o
avio: Add an internal function for reading without copying

As long as there is enough contiguous data in the avio buffer,
just return a pointer to it instead of copying it to the caller
provided buffer.

Signed-off-by: Martin Storsjö <martin@martin.st>
mpegts: Remove one memcpy per packet

This was being performed to ensure that a complete packet was held in
contiguous memory, prior to parsing the packet. However, the source buffer
is typically large enough that the packet was already contiguous, so it is
beneficial to return the packet by reference in most cases.

         Before          After
         Mean   StdDev   Mean   StdDev  Change
memcpy    720.7  32.7     649.8  25.1   +10.9%
Overall  2372.7  46.1    2291.7  21.8    +3.5%

Signed-off-by: Martin Storsjö <martin@martin.st>
mpegts: Make discard_pid() faster for single-program streams

When a stream contains a single program, there's no point in doing a
PID -> program lookup. Normally the one and only program isn't disabled,
so no packets should be discarded.

              Before          After
              Mean   StdDev   Mean   StdDev  Change
discard_pid()   73.8  9.4       20.2  1.5    +264.8%
Overall       2300.8 28.0     2253.1 20.6      +2.1%

Signed-off-by: Martin Storsjö <martin@martin.st>
libx264: add shortcut for the bluray compatibility option

As for intra-refresh it is just a commodity.
lavf: Support unix sockets
network: Use SOCK_CLOEXEC when available