Guess the file format.
@param is_opened Whether the file is already opened; determines whether demuxers with or without AVFMT_NOFILE are probed. @param score_ret The score of the best detection.
See Implementation
Guess the file format.
@param is_opened Whether the file is already opened; determines whether demuxers with or without AVFMT_NOFILE are probed. @param score_ret The score of the best detection.