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lavf: Document the codec context initialization

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During remuxing avcodec_copy_context() is discouraged as certain fields
(such as codec_tag) could reflect invalid values between input and
output contextes.
This commit is contained in:
Vittorio Giovara 2014-12-04 19:09:40 +00:00
parent cb70a93ca1
commit bb7701684c
1 changed files with 4 additions and 0 deletions
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libavformat/avformat.h
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@ -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 contexts.
* - 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