hiphopjae.blogg.se - Ffmpeg map question mark

input_file_index refers to an input and by default will include all of its streams.map input_file_index:stream_type_specifier:stream_index Using the -map option disables the default stream selection behavior and allows you to manually choose streams. The default stream selection will choose streams based upon specific criteria.For example, if the input has 3 video streams it will only choose 1. Only 1 stream per type will be selected.Default stream selection will not automatically choose all of the streams.If you do not use the -map option then the default stream selection behavior will automatically choose streams. -map 0 -map -0:s Will select all streams from input index #0 (the 1st input) except subtitles.-map 3:s:4 From input index #3 (the 4th input) select subtitle stream index #4 (the fifth subtitle stream).-map 1:a From input index #1 (the 2nd input) select all audio streams.

-map 0 From input index #0 (the 1st input) select all streams.map 1:a:2 refers to "second input:audio only:third audio stream". The bottom command includes stream specifiers ( v for video, a for audio) to limit the streams to a specific type.map 1:3 refers to "second input:fourth stream".

This is an absolute method of mapping and will choose a specific stream regardless of type.

The top command does not use any stream specifiers.

The commands do the same thing, but use different syntax to map streams: The commands in the diagram above will select the video from input0.mp4 and the 3rd audio stream from input1.mkv to output.mp4. The -map option can also be used to exclude specific streams with negative mapping. The -map option is used to choose which streams from the input(s) should be included in the output(s).