avformat/file: fail for non-numerical arguments to pipe:
Before this patch, the implementation of pipe: inputs/outputs would
silently fall back to stdin/stdout for any argument not successfully
parsed by strtol().
This patch introduces an explicit error for any non-numerical arguments,
which should avoid user confusion as in #10977.
New behavior:
$ cat /tmp/video.mkv | ./ffmpeg -i pipe:aa -acodec copy -vcodec copy -f matroska pipe:1 | cat >/tmp/out.mkv
[pipe @ 0x5618c7bcf740] Non-numerical argument "aa" to pipe:
[in#0 @ 0x5618c7bced00] Error opening input: Invalid argument
Error opening input file pipe:aa.
Error opening input files: Invalid argument
Based on the patch of Nils Goroll <nils.goroll@uplex.de>.
Signed-off-by:
Marton Balint <cus@passwd.hu>
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