Based on patch by Anton Khirnov
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Any alleged performance benefits gained from the split are purely
mythological and do not justify added code complexity.

Allow to show the supported options in the ffmpeg -h full output.

Fix possible crash occurring when libc does not support NULL printing.

If the first argument can be read as a video size, set that output size
in the scale. This allows to specify in a filtergraph scale=qcif or
scale=320x240.

This is not completely safe, for example in case of a typo in the video
size string the first argument will be read as the input width
expression, giving rise to a confusing comment.

Avoid an assert, since now the function supports error code return.

Also update documentation accordingly.

A number of compilers, for example those from TI and IBM, choke on
these initialisers.  The current style is also quite ugly.

Signed-off-by: Mans Rullgard <mans@mansr.com>

Fixes Bug 203.

CC:libav-stable@libav.org

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

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

Reduce log clutter, consistent with 1a49a169eb.

It is not used in any filters currently and is inherently evil. If
passing binary data to filters is required in the future, it should be
done with some AVOptions-based system.

Fix warning:
libavfilter/vf_scale.c: In function ‘start_frame’:
libavfilter/vf_scale.c:284:23: warning: unused variable ‘out_link’ [-Wunused-variable]

It will allow adding new fields to it without ABI breaks.

They are only useful inside filters and we don't allow user filters for
now.

They are only useful inside filters and we don't allow user filters for
now.

It is only useful inside filters and we don't allow user filters for
now.

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

Since those are pseudo-palette formats, swscale does not write
into data[1], swscale must initialize the palette properly itself.
This lead to frames that actually decoded as all-gray before.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>

We can't use whether the input format is paletted to decide that
the output format has a palette in data[1], too, that makes no sense.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>

I.e. just pass the buffer along when src parameters == dst parameters.

Also show the input and output sample aspect ratio in the log.

This makes it possible to dintinguish them from PAL8.

Fixes an invalid write in avpicture_layout().

Address trac ticket #706.

While quality is bad, PAL8 support is needed to allow testing some
encoders that only support PAL8 input.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>

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

GCC 4.6.2 at least still seems to fail to put them in .rodata though,
see also http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37303

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>

Fixes Ticket594

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

Signed-off-by: Nicolas George <nicolas.george@normalesup.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

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

Signed-off-by: Anton Khirnov <anton@khirnov.net>

Also create a "dar" alias for the "a" variable, for avoiding possible
confusion between dar/sar.

Signed-off-by: Anton Khirnov <anton@khirnov.net>

Signed-off-by: Anton Khirnov <anton@khirnov.net>

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

Previously, "dar" and "a" were documented like "input display aspect
ratio", but their actual value was "in_w/in_h".

In order to avoid to break scripts which rely on the "a" variable, the
patch keeps the same semantics but fixes the corresponding docs, and
fixes the semantics of the recently added "dar" variable, which
now correctly expresses the input Display Aspect Ratio value as
"(inw_w/in_h)*sar".

Also create a "dar" alias for the "a" variable, for avoiding possible
confusion between dar/sar.

Signed-off-by: Mans Rullgard <mans@mansr.com>

Fixes compiler warning about incompatible types in sws_scale call.