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[whatwg] HTML5 video: frame accuracy / SMPTE

From: Rob Coenen <coenen.rob@gmail.com>
Date: Tue, 11 Jan 2011 22:20:30 +0000
Message-ID: <AANLkTikWbLV7ju=Fm6K=64P-Hv9Hi5kUX9iD0_dGoD4T@mail.gmail.com>
Chris, maybe I'm wording it incorrect, but when I run the mediainfo utility
on my test file it reports "frame rate: 25.000 fps"
(test for yourself with my test file:
http://www.massive-interactive.nl/html5_video/video/timecoded.webm)

I can imagine there are 'virtual' frames, where say frame 1 to 10 is
actually the same frame and internally encoded as frame 1 with a duration of
10 frames?

Even then I'd like the 'virtual' FPS of the WebM file exposed to the
webbrowser- similar to how my other utilities report a FPS.

This way one could build web-tools in HTML5 that allow to access each
individual frame and do other things than simply playing back the movie in a
linear fashion from beginning to end.

-Rob



On Tue, Jan 11, 2011 at 10:05 PM, Chris Pearce <chris at pearce.org.nz> wrote:

> On 12/01/2011 10:58 a.m., Rob Coenen wrote:
>
>> Intresting- I didn't know that variable frame-rate videos were actually
>> being used for HTML5 video.
>>
>
> WebM videos have no fixed frame rate. This format is supported in Firefox
> 4, Chrome, and Opera.
>
> Chris P.
>
>
Received on Tuesday, 11 January 2011 14:20:30 UTC

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