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vd_lavc: add an option to explicitly workaround x264 4:4:4 bug 

Technically, the user could just use --vd-lavc-o with the same result.
But I find it better to make this an explicit option, so we can document
the ups and downs, and also avoid setting it for non-h264.
This commit is contained in:
wm4 2017-12-26 05:53:44 +01:00 committed by Kevin Mitchell
parent f6a582e0b2
commit d480b1261b
2 changed files with 17 additions and 0 deletions
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12
DOCS/man/options.rst
View File

@ -1159,6 +1159,18 @@ Video
on the machine and use that, up to the maximum of 16. You can set more than
16 threads manually.
``--vd-lavc-assume-old-x264=<yes|no>``
Assume the video was encoded by an old, buggy x264 version (default: no).
Normally, this is autodetected by libavcodec. But if the bitstream contains
no x264 version info (or it was somehow skipped), and the stream was in fact
encoded by an old x264 version (build 150 or earlier), and if the stream
uses ``4:4:4`` chroma, then libavcodec will by default show corrupted video.
This option sets the libavcodec ``x264_build`` option to ``150``, which
means that if the stream contains no version info, or was not encoded by
x264 at all, it assumes it was encoded by the old version. Enabling this
option is pretty safe if you want your broken files to work, but in theory
this can break on streams not encoded by x264, or if a stream encoded by a
newer x264 version contains no version info.
Audio

5
video/decode/vd_lavc.c
View File

@ -80,6 +80,7 @@ struct vd_lavc_params {
int framedrop;
int threads;
int bitexact;
int old_x264;
int check_hw_profile;
int software_fallback;
char **avopts;
@ -109,6 +110,7 @@ const struct m_sub_options vd_lavc_conf = {
OPT_DISCARD("framedrop", framedrop, 0),
OPT_INT("threads", threads, M_OPT_MIN, .min = 0),
OPT_FLAG("bitexact", bitexact, 0),
OPT_FLAG("assume-old-x264", old_x264, 0),
OPT_FLAG("check-hw-profile", check_hw_profile, 0),
OPT_CHOICE_OR_INT("software-fallback", software_fallback, 0, 1, INT_MAX,
({"no", INT_MAX}, {"yes", 1})),
@ -647,6 +649,9 @@ static void init_avctx(struct dec_video *vd)
avctx->skip_idct = lavc_param->skip_idct;
avctx->skip_frame = lavc_param->skip_frame;
if (lavc_codec->id == AV_CODEC_ID_H264 && lavc_param->old_x264)
av_opt_set(avctx, "x264_build", "150", AV_OPT_SEARCH_CHILDREN);
mp_set_avopts(vd->log, avctx, lavc_param->avopts);
// Do this after the above avopt handling in case it changes values