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Can't output to file descriptor #3048

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@danielzgtg

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@danielzgtg

I would like whisper-cli to have the generality of being able to output to a file descriptor. We can already input from a fd using /dev/fd/3, but it doesn't work with -of /dev/fd/4. Accepting an output file descriptor could allow me the flexibility of using sockets and pipes.

Here is an simplified example of the current error:

$ exec 3<path/to/wav
$ exec 4>/path/to/vtt
$ ~/path/to/whisper-cli -l auto -ovtt -m path/to/model /dev/fd/3 -of /dev/fd/4
[...]
whisper_model_load: [...]
[...]

main: processing '/dev/fd/3' [...]

[00:00:00.000 --> 00:00:10.000]   [...]
[...]

output_vtt: failed to open '/dev/fd/4.vtt' for writing

whisper_print_timings: [...]

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