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lavf: do not set codec_tag for rawvideo

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If the demuxer did not set a codec_tag, there is none and
inventing one makes no sense.  This change stops the rawvideo
"decoder" over-writing user-supplied pixfmt with one derived
from the codec_tag.  The pixfmt-codec_tag-pixfmt round-trip
is lossy since several pixfmts map to the same codec_tag.

This fixes fate-lavf-pixfmt with avfilter disabled.

Signed-off-by: Mans Rullgard <mans@mansr.com>
(cherry picked from commit bb416bd68c)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
This commit is contained in:
Mans Rullgard 2011-07-17 16:02:33 +01:00 committed by Reinhard Tartler
parent 9bb7a128a3
commit e257eebd17
1 changed files with 0 additions and 3 deletions
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3
libavformat/utils.c
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@ -2405,9 +2405,6 @@ int av_find_stream_info(AVFormatContext *ic)
(st->codec_info_nb_frames-2)*(int64_t)st->time_base.den,
st->info->codec_info_duration*(int64_t)st->time_base.num, 60000);
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
if(st->codec->codec_id == CODEC_ID_RAWVIDEO && !st->codec->codec_tag && !st->codec->bits_per_coded_sample)
st->codec->codec_tag= avcodec_pix_fmt_to_codec_tag(st->codec->pix_fmt);
// the check for tb_unreliable() is not completely correct, since this is not about handling
// a unreliable/inexact time base, but a time base that is finer than necessary, as e.g.
// ipmovie.c produces.