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Defined in avformat.h

Add a new stream to a media file.

Can only be called in the read_header() function. If the flag AVFMTCTX_NOHEADER is in the format context, then new streams can be added in av_read_packet() too.

AVStream *av_new_stream(AVFormatContext *s,
                        int id);

AVFormatContext *s

Media file handle, contained in a AVFormatContext pointer.

int id

File format dependent stream id.
See av_find_default_stream_index() for more info.

A pointer to the new AVStream or NULL upon failure.

av_find_default_stream_index()

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