ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinha...@outlook.com> | Wed Apr 30 18:20:51 2025 +0200| [1f0af6b5925e7b8529224777dc700b08a93f8fb4] | committer: Andreas Rheinhardt
avcodec/mpeg12dec: Don't reinit upon aspect ratio change The spec indeed does not allow the aspect ratio to change within a video sequence, but this does not imply that we must reinitialize the decoder if only the aspect ratio changes, as this value does not affect the decoding process at all. Moreover, our reinitialization is a bit buggy: If there is frame reordering, then the not yet output next P-frame is simply discarded upon reinit. With this patch this no longer happens when only the aspect ratio changes. Signed-off-by: Andreas Rheinhardt <andreas.rheinha...@outlook.com> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=1f0af6b5925e7b8529224777dc700b08a93f8fb4 --- libavcodec/mpeg12dec.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/libavcodec/mpeg12dec.c b/libavcodec/mpeg12dec.c index 42e91fc4b2..3688c6287e 100644 --- a/libavcodec/mpeg12dec.c +++ b/libavcodec/mpeg12dec.c @@ -80,7 +80,6 @@ typedef struct Mpeg1Context { int has_afd; int slice_count; unsigned aspect_ratio_info; - AVRational save_aspect; int save_width, save_height, save_progressive_seq; AVRational frame_rate_ext; /* MPEG-2 specific framerate modificator */ unsigned frame_rate_index; @@ -918,7 +917,6 @@ static int mpeg_decode_postinit(AVCodecContext *avctx) avctx->coded_height != s->height || s1->save_width != s->width || s1->save_height != s->height || - av_cmp_q(s1->save_aspect, s->avctx->sample_aspect_ratio) || (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) || 0) { if (s->context_initialized) @@ -935,7 +933,6 @@ static int mpeg_decode_postinit(AVCodecContext *avctx) (s1->bit_rate != 0x3FFFF*400 || s1->vbv_delay != 0xFFFF)) { avctx->bit_rate = s1->bit_rate; } - s1->save_aspect = s->avctx->sample_aspect_ratio; s1->save_width = s->width; s1->save_height = s->height; s1->save_progressive_seq = s->progressive_sequence; _______________________________________________ ffmpeg-cvslog mailing list ffmpeg-cvslog@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog To unsubscribe, visit link above, or email ffmpeg-cvslog-requ...@ffmpeg.org with subject "unsubscribe".
