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avformat/webpenc: don't assume animated webp streams will have more than one packet 

The libwebp_animencoder returns a single packet with the entire animated
stream, as that's what the external library produces. As such, only ensure the
stream was produced by said encoder (or propagated by a demuxer, once support
is added) when attempting to write the requested loop value.

Fixes ticket #9179.

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2021-04-10 22:53:34 -03:00
parent 2e17b169f7
commit 55d667d86a
1 changed files with 1 additions and 1 deletions
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libavformat/webpenc.c
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@ -172,7 +172,7 @@ static int webp_write_trailer(AVFormatContext *s)
WebpContext *w = s->priv_data;
if (w->using_webp_anim_encoder) {
if ((w->frame_count > 1) && w->loop) { // Write loop count.
if (w->loop) { // Write loop count.
avio_seek(s->pb, 42, SEEK_SET);
avio_wl16(s->pb, w->loop);
}