On Thu, Dec 4, 2014 at 8:09 PM, Vittorio Giovara <[email protected]> wrote: > During remuxing avcodec_copy_context() is discouraged as certain fields > (such as codec_tag) could reflect invalid values between input and > output contextes. > --- > libavformat/avformat.h | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/libavformat/avformat.h b/libavformat/avformat.h > index 4706f62..197a3f1 100644 > --- a/libavformat/avformat.h > +++ b/libavformat/avformat.h > @@ -198,6 +198,10 @@ > * be set to the timebase that the caller desires to use for this stream > (note > * that the timebase actually used by the muxer can be different, as will > be > * described later). > + * - It is advised to manually initialize only the relevant fields in > + * AVCodecContext, rather than using @ref avcodec_copy_context() during > + * remuxing: there is no guarantee that the codec context values remain > valid > + * for both input and output format contextes. > * - The caller may fill in additional information, such as @ref > * AVFormatContext.metadata "global" or @ref AVStream.metadata "per-stream" > * metadata, @ref AVFormatContext.chapters "chapters", @ref > -- > 1.9.3 (Apple Git-50) >
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