Show HN: WebAssembly and ffmpeg = Quick clip, overlay, resize and GIF-ize videos

Re:Show HN: WebAssembly and ffmpeg = Quick clip, overlay, re... by Andrew_W on Thursday March 25, 2021 @01:03PM (#26582696)

That's awesome! Do you have an example ffmpeg command you run?

We're trying to keep this tool super simple for our end users, but I think we might be able to add a webm preset.

If you'd like me to look into it, drop me an email: andrew@<domain in link> and show me a sample command :)

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Re:Show HN: WebAssembly and ffmpeg = Quick clip, overlay, re... by felixfbecker on Thursday March 25, 2021 @04:23PM (#26584906)

I use this command I found on SO (was the first Google result): https://video.stackexchange.com/a/28276

    ffmpeg  -i input.mp4  -b:v 0  -crf 30  -pass 1  -an -f webm /dev/null
    ffmpeg  -i input.mp4  -b:v 0  -crf 30  -pass 2  output.webm

Making it two passes seems to be important for WEBM according to the post. It has worked well for me so far, but I need to look it up every time.

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Re:Show HN: WebAssembly and ffmpeg = Quick clip, overlay, re... by shakna on Thursday March 25, 2021 @01:25PM (#26582945)

I use the very basic:

    ffmpeg -i FILE -codec:v libvpx-vp9 -qscale:v 0 -codec:a libvorbis -qscale:a 0 FILE.webm

And end up with really good results out the other end. When I was rendering with pre-VP9 I needed a few more flags (stuff like crf) to maintain quality, but this works fine for most things. And has been really impressive on the filesize side of things.

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