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Defined in avformat.h

Guess the format based on the filename.

AVOutputFormat *guess_format(const char *short_name,
                             const char *filename,
                             const char *mime_type);

const char *short_name

Figure out what this parameter does. Unknown. Can be NULL.

const char *filename

The filename to use when guessing.

const char *mime_type

Figure out what this parameter does. Unknown. Can be NULL.

A pointer to AVOutputFormat containing info on the format, or NULL on failure;

av_guess_codec() and guess_stream_format()

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