Full list of options that can be set on FFmpegFrameGrabber/FFmpegFrameRecorder

[enwi]

In a previous issue the following options where given as working with FFmpegFrameRecorder and I am assuming the same goes for FFmpegFrameGrabber. Though it would be great to have a full list of options that work. For my part I would like to know whether the loglevel option can be set or not? (I tried setting the option, but it did not change anything)

setOption() is for at least the following options:
https://ffmpeg.org/ffmpeg-formats.html
https://ffmpeg.org/ffmpeg-protocols.html
https://ffmpeg.org/ffmpeg-devices.html
but maybe others too.

setAudioOption() and setVideoOption() are for the options here:
https://ffmpeg.org/ffmpeg-codecs.html

That should be better documented probably in the API docs with Javadoc,
so please send a pull request to that effect! Thanks

Originally posted by @saudet in #1356 (comment)

[enwi]

I did some more debugging and found that both pixel_format and loglevel options are rejected by FFmpegFrameGrabber. I figured this out using a debugger and dumping the options after calling avformat_open_input, which should then include any rejected options.

AVDictionaryEntry e = null;
while ((e = av_dict_iterate(options, e)) != null)
{
    System.out.println("Key: " + e.key().getString() + ", value: " + e.value().getString());
}

Key: pixel_format, value: bgr24
Key: loglevel, value: +level+verbose

Maybe these rejected options should be dumped to the console if there are any?

if (av_log_get_level() >= AV_LOG_INFO && av_dict_count(options) > 0)
{
    AVDictionaryEntry e = null;
    System.out.println("Rejected options:");
    while ((e = av_dict_iterate(options, e)) != null)
    {
        System.out.println("\tOption: " + e.key().getString() + ", value: " + e.value().getString());
    }
}

[saudet]

Sure, contributions are welcome!