How to pass -x256-params to output?

[emepetres]

Hi, I'd like to do something like

ffmpeg -i input.mp4 -vcodec libx265 -x265-params lossless=1 -crf 0 -pix_fmt yuv420p output.mp4

However, I don't know how to specify the -x265-params as an output argument:

stream = ffmpeg.output(
        stream,
        "output.mp4",
        vcodec="libx265",
        x265-params="lossless=1",  # <--- This parameter is wrong in python
        crf=0,
        pix_fmt="yuv420"
    )

Thanks!

[NaichuanYang]

it's work for me
you can use .global_args('-x265-params', 'xxxxxx') after output() method

[ksofiyuk]

I've found that passing x265-params after the output method through global_args doesn't work as intended. It seems that those options are ignored when presented after the output argument in FFmpeg, at least .global_args('-x265-params', 'log-info=error') doesn't change the logging level of libx265 and it continues to produce unnecessary messages.

However, there is another option. An FFmpeg argument with a dash in its name can be passed in the following way:

ffmpeg_stream = ffmpeg_stream.output(
      output_media_path,
      codec="libx265",
      loglevel="quiet",
      **{"x265-params": "log-level=error"},
)
ffmpeg_stream.run()

That code successfully silences both FFmpeg and libx265.