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Description
When I download YouTube video using --write-thumbnail, I always got a webp format image file. However, this format is not pretty convenient for my further use. Thus, I have to convert it to a png or jpg file using MS paint "saving as ...”. I thought if there is a thumbnail format conversion function, it will be quite helpful.
You see, the main download function of YouTube-dl such as download video/audio/subtitle, all have their format convert function (as --audio-format FORMAT, --recode-video FORMAT, --convert-subs FORMAT). So thumbnail format conversion function seems reasonable.
The Implementation of this function could simply use FFmpeg, as other convert function already does.
Thanks a lot!