[SCM] libav/experimental: detecting xvid/divx4/opendivx and set low_delay flag
siretart at users.alioth.debian.org
siretart at users.alioth.debian.org
Sun Jun 30 15:31:32 UTC 2013
The following commit has been merged in the experimental branch:
commit f94985d046c5e0775e6bf259ec307398554341c6
Author: Michael Niedermayer <michaelni at gmx.at>
Date: Sat Apr 27 14:10:47 2002 +0000
detecting xvid/divx4/opendivx and set low_delay flag
Originally committed as revision 425 to svn://svn.ffmpeg.org/ffmpeg/trunk
diff --git a/libavcodec/h263.c b/libavcodec/h263.c
index 81c7fd7..7543264 100644
--- a/libavcodec/h263.c
+++ b/libavcodec/h263.c
@@ -2584,6 +2584,7 @@ int mpeg4_decode_picture_header(MpegEncContext * s)
{
int time_incr, startcode, state, v;
int time_increment;
+ int vol_control=-1;
redo:
/* search next start code */
@@ -2627,7 +2628,7 @@ int mpeg4_decode_picture_header(MpegEncContext * s)
skip_bits(&s->gb, 8); // par_height
}
- if(get_bits1(&s->gb)){ /* vol control parameter */
+ if(vol_control=get_bits1(&s->gb)){ /* vol control parameter */
int chroma_format= get_bits(&s->gb, 2);
if(chroma_format!=1){
printf("illegal chroma format\n");
@@ -2943,8 +2944,17 @@ int mpeg4_decode_picture_header(MpegEncContext * s)
}
}
}
+ /* detect buggy encoders which dont set the low_delay flag (divx4/xvid/opendivx)*/
+ // note we cannot detect divx5 without b-frames easyly (allthough its buggy too)
+ if(s->vo_type==0 && vol_control==0 && s->divx_version==0){
+ if(s->picture_number==0)
+ printf("looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
+ s->low_delay=1;
+ }
+
s->picture_number++; // better than pic number==0 allways ;)
//printf("done\n");
+
return 0;
}
--
Libav/FFmpeg packaging
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