lavfi: Increase drawtext font size limits

Raise the maximum font size to a larger value.

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
latm: Do not give a score for a single instance

Bug-Id: 773
CC: libav-stable@libav.org
mp3: Tweak the probe scores

Having more than 10 consecutive frames decoded as mp3 should be
considered a clear signal that the sample is mp3 and not mpegps.

Reported-By: Florian Iragne <florian@iragne.fr>
CC: libav-stable@libav.org
doc: Use the correct @subsection tag

makeinfo would otherwise refuse to build it.
Fix xcb 32bit pix_fmts: There is no screen transparency.
Improve configure help text.

Show which features external libraries enable.
Fixes ticket #4157
Merge commit '71f29410e7c58f2ce4aef1d4b8d8d3c064c8ec06'

* commit '71f29410e7c58f2ce4aef1d4b8d8d3c064c8ec06':
  lavfi: Increase drawtext font size limits

Conflicts:
	libavfilter/vf_drawtext.c

See: b87d4c2b9f4106045afeabe1f1338c3eddb66935
Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '4f5906a1d7f4368cec43b224e8a675f54d2001d2'

* commit '4f5906a1d7f4368cec43b224e8a675f54d2001d2':
  latm: Do not give a score for a single instance

Conflicts:
	libavformat/rawdec.c

No change, the buggy case was not part of FFmpeg

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '4fd7e63c87226584e60200b82630a6057c0a6663'

* commit '4fd7e63c87226584e60200b82630a6057c0a6663':
  mp3: Tweak the probe scores

Conflicts:
	libavformat/mp3dec.c

FFmpeg detects the file fine, and there is a non zero risk
that this change may lead to misdetections, thus not merged.
If someone has a mp3 file that is misdetected, please open a ticket

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '6a880090cd75b6c31b5ee1f088b6578a293099c6'

* commit '6a880090cd75b6c31b5ee1f088b6578a293099c6':
  doc: Use the correct @subsection tag

See: cf3bfc970c7a567763aef4bf7ce827f84d692fd6
Merged-by: Michael Niedermayer <michaelni@gmx.at>
avformat/movenc: Add 2048x1080 to the aivx case

This improves compatibility of such files with apple tools

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/pngdec: check av_image_get_linesize return value

Fixes CID 1257012

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