VP8-in-WebP only uses key frame encoding (see [1]), yet this is currently not enforced. This commit does so in order to make output reproducible with frame-threading as the VP8 decoder's update_thread_context is not called at all when using decoding VP8-in-WebP (as this is unnecessary for key frame-only streams).
[1]: https://developers.google.com/speed/webp/docs/riff_container Signed-off-by: Andreas Rheinhardt <andreas.rheinha...@outlook.com> --- libavcodec/vp8.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/libavcodec/vp8.c b/libavcodec/vp8.c index 83c60adeb0..7972775a1c 100644 --- a/libavcodec/vp8.c +++ b/libavcodec/vp8.c @@ -2665,7 +2665,11 @@ int vp78_decode_frame(AVCodecContext *avctx, AVFrame *rframe, int *got_frame, if (ret < 0) goto err; - if (s->actually_webp) { + if (!is_vp7 && s->actually_webp) { + // VP8 in WebP is supposed to be intra-only. Enforce this here + // to ensure that output is reproducible with frame-threading. + if (!s->keyframe) + return AVERROR_INVALIDDATA; // avctx->pix_fmt already set in caller. } else if (!is_vp7 && s->pix_fmt == AV_PIX_FMT_NONE) { s->pix_fmt = get_pixel_format(s); -- 2.34.1 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
