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Defined in avformat.h

Set the output parameters of the output video context (see libavformat/output_example.c in the ffmpeg source tree]]). Must be done even if no parameters in order to prepare the output format context. In this latter case ap may be NULL.

int av_set_parameters(AVFormatContext *s,
                      AVFormatParameters *ap);

AVFormatContext *s

A pointer to the output video context (AVFormatContext)to be populated.

AVFormatParameters *ap

A pointer to the format parameters (AVFormatParameters) (sometimes gathered from the command line). May be NULL.

On invalid output format returns a negative number.

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