clarify sub_id

Originally committed as revision 8483 to svn://svn.ffmpeg.org/ffmpeg/trunk
18 years ago · 89cff671f4
parent 7e068841cb
commit 89cff671f4
1 changed files with 4 additions and 1 deletions
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@ -743,7 +743,10 @@ typedef struct AVCodecContext {

    /**
     * some codecs needs additionnal format info. It is stored here
-     * - encoding: set by user.
+     * if any muxer uses this then ALL demuxers/parsers AND encoders for the specific codec MUST set it correctly
+     * too otherwise stream copy breaks
+     * in general use of this field by muxers is not recommanded
+     * - encoding: set by lavc.
     * - decoding: set by lavc. (FIXME is this ok?)
     */
    int sub_id;