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A comment on Every pricing page should have GIFs. Parent comment

Re:Every pricing page should have GIFs by capybara_2020 on Tuesday November 30, 2021 @09:23AM (#29392392)
Can they be used exactly like gifs? I have seen a few sites with mp4s but Firefox blocks them.

I do not think even sites like Dribbble have figured it out. I have a lot of issues there with videos.

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Re:Every pricing page should have GIFs by hateful on Tuesday November 30, 2021 @09:49AM (#29392688)
Maybe they had sound, even if it was silence? https://support.mozilla.org/en-US/kb/block-autoplay
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Re:Every pricing page should have GIFs by marcosdumay on Tuesday November 30, 2021 @12:20PM (#29394626)
Well, Firefox blocks gifs to me too.

It depends on how you configure it. Any option you choose, make sure the first frame is informative.

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Re:Every pricing page should have GIFs by chrisseaton on Tuesday November 30, 2021 @08:44PM (#29399705)
The vast vast majority of people don't configure their browsers at all.

What matters is what the defaults are.

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Re:Every pricing page should have GIFs by marcosdumay on Wednesday December 01, 2021 @05:39PM (#29410086)
By default Firefox blocks anything that has audio, and lets anything that is mute play. In fact, now that I searched it again, it seems that there is no option to make gifs behave differently from video files anymore.

That's not what the GP saw.

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Re:Every pricing page should have GIFs by devmor on Tuesday November 30, 2021 @09:38AM (#29392543)
Firefox doesn't block any MP4s for me. Sounds like your addons, or a cross site security error.
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Re:Every pricing page should have GIFs by gpvos on Tuesday November 30, 2021 @10:01AM (#29392829)
In what way does Firefox block them? If you mean they don't autoplay: that is how it is meant to be. Please do not annoy your users.
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Re:Every pricing page should have GIFs by mceachen on Tuesday November 30, 2021 @10:38AM (#29393279)
They may have tried to open arbitrary mp4s and had Firefox not render it.

Firefox seems to only render MP4 files that use yuv colorspace and aa3 audio channels, which require specific ffmpeg flags during transcoding. It took me a day of grinding whackamole to find the magic set of arguments to make all recent, popular browsers actually display a video:

https://github.com/photostructure/photostructure-for-servers...

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Re:Every pricing page should have GIFs by Sesse__ on Tuesday November 30, 2021 @03:38PM (#29397156)
More specifically, most devices will want _4:2:0_ Y'CbCr. It's highly unlikely that FFmpeg gave you anything that's not Y'CbCr (H.264 can technically encode RGB, but I've never ever seen it in use). And if it chooses 4:2:2 or 4:4:4, you get a warning.

FWIW, if you really want to encode your video in Rec. 2020, you'd almost certainly want a 10-bit encode, and then you're outside what e.g. iOS devices will render again. Rec. 709 is the safe choice.

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Re:Every pricing page should have GIFs by Groxx on Tuesday November 30, 2021 @03:09PM (#29396853)
Possibly a useful doc for ya then: https://developer.mozilla.org/en-US/docs/Web/Media/Formats/V... . And beyond that it depends on the OS, so windows/linux/mac/ios/android/etc will all vary.

Some of this is also probably due to using ffmpeg directly, tbh. It's very happy to produce irrational combinations of things that are technically allowed by specs but not implemented anywhere in practice, often exacerbated by it trying to preserve metadata / colorspace / etc where technically possible.

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Re:Every pricing page should have GIFs by astroalex on Tuesday November 30, 2021 @10:46AM (#29393377)
I have issues with videos on Twitter. It's not every video, but about 10% refuse to play in Firefox.
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