This patch to libavcodec/opus.c will create the opus extradata if it is missing. This is required when muxing opus data from an RTP demuxer. Without this patch, the opux muxer will fail with a "No extradata present" error.
This issue was first reported by Juan Navarro here: http://www.ffmpeg-archive.org/Unable-to-record-VP8-Opus-from-RTP-SDP-td4689046.html This patch was first created by Carl Eugen Hoyos, but didn't land because resulting opus files wouldn't play in VLC. The reason is because the opus headers in the original patch were too large. This patch update's Carl's original patch to limit the size of the extradata to 19 bytes.
0001-lavc-opus-Create-extradata-if-it-is-missing.patch
Description: Binary data
0002-lavc-opus-Opus-extradata-should-only-be-19-bytes.patch
Description: Binary data
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