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