BreKa

Hello there, nice work on the docker, thanks for that! Is there a way to specify the audio download format beyond Any (which is "bestaudio" i guess) and MP4 (which is m4a)? On my short testvideo, Any results into a .webm file (OPUS codec) and MP4 as expected in a .m4a file (AAC LC). It would be nice, to select MP3 and/or FLAC. Also is there a way you can implement conversion of thumbnails to jpg as of now they are downloaded as webp? FFMPEG should be capable of both converting to MP3 and JPG. And could you please update readme.md with an example for use of multiple YTDL_OPTIONS e.g. {"writedescription":"DESCRIPTION", "writethumbnail":"THUMBNAIL"}? Thank you! BreKa