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h261: Set 'still image mode off' in picture header

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Ref H.261 recommendation section 4.2.1.3, setting the still image flag
to 1 disables still image mode. Some decoders require this in order to
decode the bitstream as normal video.

Fixes H.261 calls to Cisco E20.

Also, reserved (aka spare) bits should be set to 1 unless specified
otherwise.

Bug-Id: 872
CC: libav-stable@libav.org

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Stian Selnes 2014-12-12 16:08:19 +01:00 committed by Luca Barbato
parent c8b8271379
commit dc1de0b958
3 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
libavcodec/h261enc.c
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@ -70,8 +70,8 @@ void ff_h261_encode_picture_header(MpegEncContext *s, int picture_number)
put_bits(&s->pb, 1, format); /* 0 == QCIF, 1 == CIF */
put_bits(&s->pb, 1, 0); /* still image mode */
put_bits(&s->pb, 1, 0); /* reserved */
put_bits(&s->pb, 1, 1); /* still image mode */
put_bits(&s->pb, 1, 1); /* reserved */
put_bits(&s->pb, 1, 0); /* no PEI */
if (format == 0)

2
tests/ref/vsynth/vsynth1-h261
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@ -1,4 +1,4 @@
d3397557ad8a02d28cb5feeb0b51e5c8 *tests/data/fate/vsynth1-h261.avi
34263080870c91c5e6c3c7dca799c50d *tests/data/fate/vsynth1-h261.avi
707576 tests/data/fate/vsynth1-h261.avi
716e83cb51afb1246bfaa80967df48ea *tests/data/fate/vsynth1-h261.out.rawvideo
stddev: 9.11 PSNR: 28.93 MAXDIFF: 113 bytes: 7603200/ 7603200

2
tests/ref/vsynth/vsynth2-h261
View File

@ -1,4 +1,4 @@
b5187bd5be8b422ff220f297de90fbcb *tests/data/fate/vsynth2-h261.avi
70e9342de71456cd6fbe9a771cceefd5 *tests/data/fate/vsynth2-h261.avi
257928 tests/data/fate/vsynth2-h261.avi
1a9bb0d52bd24cb62162c5e3c2aed317 *tests/data/fate/vsynth2-h261.out.rawvideo
stddev: 7.21 PSNR: 30.97 MAXDIFF: 96 bytes: 7603200/ 7603200