On 25/07/2024 00.56, gqqnb2005 wrote:
Basically, I want to figure out how to specify streams for the option -map,
-codec, and -filter_complex.
ffmpeg -i INPUT -map 0:1 out.wav
Is 0:1 a stream specifier (
https://ffmpeg.org//ffmpeg.html#Stream-specifiers-1)? Which form is it?
Yes. Input 0, stream 1 (i.e., the 2nd stream, of any type). 'map' wires things to the output. No
'map', no output.
ffmpeg -i INPUT -map 0 -c copy -c:v:1 libx264 -c:a:137 libvorbis OUTPUT
v:1 and a:137 seem to follow the syntax of stream specifier because a and v
are stream_type.
Yes, the 2nd video stream. There can't be 138 audio streams, so that has to be
wrong.
ffmpeg -i in.flac -filter_complex 'acrossover=split=1500[LOW][HIGH]' -map
'[LOW]' low.wav -map '[HIGH]' high.wav
Is '[LOW]' in the syntax of stream specifier?
In a sense, yes. It's a 'plug'. You connect plugs within a filter complex and to the output 'map'
like they are physical equipment.
--Mark.
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