Otherwise, it matches all streams of the specified type. If additional_stream_specifier is used, then it matches streams which both have this type and match the additional_stream_specifier.
’v’ matches all video streams, ’V’ only matches video streams which are not attached pictures, video thumbnails or cover arts. Stream_type is one of following: ’v’ or ’V’ for video, ’a’ for audio, ’s’ for subtitle, ’d’ for data, and ’t’ for attachments. In this case it is based on the ordering of the streams in the program. Stream numbering is based on the order of the streams as detected by libavformat except when a program ID is also specified.
If stream_index is used as an additional stream specifier (see below), then it selects stream number stream_index from the matching streams. threads:1 4 would set the thread count for the second stream to 4. Possible forms of stream specifiers are: stream_index
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