Set ffmpeg log level via environment variable or VideoDecoder kwarg

[tonyf]

🚀 The feature

Ffmpeg logs can be fairly verbose, clogging up other important logs while training. With the latest ffmpeg built from source, I'm getting lots of the following logs

[out @ 0x1fd6d440] Option 'pix_fmts' is not a runtime option and so cannot be set after the object has been initialized
[out @ 0x1fd6d440] The "pix_fmts" option is deprecated: set the supported pixel formats

Is there any way to suppress these logs as a flag to the VideoDecoder or via environment variables?

Motivation, pitch

No response

[scotts]

@tonyf, not at the moment, and that is a good callout. I assume that you expect the default behavior to be that these logs are suppressed by default?

[hanchchch]

this feature is desperately needed especially if you're using cuda as device. Using current CUDA context. logs are covering all the terminal like this:

[AVHWDeviceContext @ 0x1484ec0e4280] Using current CUDA context.
[AVHWDeviceContext @ 0x1484d400a800] Using current CUDA context.
[AVHWDeviceContext @ 0x1484e4257a40] Using current CUDA context.
[AVHWDeviceContext @ 0x1484f5457600] Using current CUDA context.
[AVHWDeviceContext @ 0x1484e001ff40] Using current CUDA context.
[AVHWDeviceContext @ 0x1484f011a300] Using current CUDA context.
[AVHWDeviceContext @ 0x1466fc1a5c00] Using current CUDA context.
[AVHWDeviceContext @ 0x146714036340] Using current CUDA context.
[AVHWDeviceContext @ 0x146718007ac0] Using current CUDA context.
[AVHWDeviceContext @ 0x1467102f5e40] Using current CUDA context.
[AVHWDeviceContext @ 0x14670c00eac0] Using current CUDA context.
[AVHWDeviceContext @ 0x152dc4fc4800] Using current CUDA context.
[AVHWDeviceContext @ 0x152dc8119540] Using current CUDA context.
[AVHWDeviceContext @ 0x152db82e1900] Using current CUDA context.
[AVHWDeviceContext @ 0x152dd00da0c0] Using current CUDA context.
[AVHWDeviceContext @ 0x152db400c080] Using current CUDA context.
[AVHWDeviceContext @ 0x152dcc00af00] Using current CUDA context.
[AVHWDeviceContext @ 0x152dbc117840] Using current CUDA context.
[AVHWDeviceContext @ 0x152dd42e7b40] Using current CUDA context.
...

[scotts]

PR #504 just turns the logging off, which I think is the real desired behavior. If folks want the ability to control the logging level, we can explore exposing that through a VideoDecoder parameter.

[hanchchch]

thanks!!!