On 16-03-2020 01:57 pm, Moritz Barsnick wrote:
On Mon, Mar 16, 2020 at 09:21:56 +0100, Michael Fladischer wrote:
But there was no syntax error:
$ ffmpeg -f -i file.ts -filter_complex '[i:0x101][i:0x103]amix=inputs=2' -vn
-c:a flac /tmp/auphonic-input-m2s6wfy8.flac
[...]
Invalid file index 0 in filtergraph description [i:0x101][i:0x103]amix=inputs=2.
Yeah, interesting. It's due to the the fact that the "-i" get swallowed
as an option to "-f", and you therefore have no input files specified,
and therefore the filtergraph cannot be set up.
With loglevel verbose, I get:
Reading option '-f' ... matched as option 'f' (force format) with argument '-i'.
I wonder why ffmpeg doesn't trip over this first. Whatever.
-f is paired with -i and file.ts is interpreted as output URL so
-filter_complex gets correctly paired with its arg.
Gyan
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