Hi!
Attached patch may fix this issue reported for Firefox:
https://bugzilla.mozilla.org/show_bug.cgi?id=1227153
Completely untested but I believe the patch matches a
comment in libopusenc.c line 90.
Please comment, Carl Eugen
diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index 98ab6df..f7fb5c3 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -924,7 +924,7 @@ static int mkv_write_track(AVFormatContext *s,
MatroskaMuxContext *mkv,
if (codec->codec_type == AVMEDIA_TYPE_AUDIO && codec->initial_padding &&
codec->codec_id == AV_CODEC_ID_OPUS) {
int64_t codecdelay = av_rescale_q(codec->initial_padding,
- (AVRational){ 1, codec->sample_rate
},
+ (AVRational){ 1, 48000 },
(AVRational){ 1, 1000000000 });
if (codecdelay < 0) {
av_log(s, AV_LOG_ERROR, "Initial padding is invalid\n");
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