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[whatwg] media elements: Relative seeking

From: Silvia Pfeiffer <silviapfeiffer1@gmail.com>
Date: Wed, 26 Nov 2008 08:13:11 +1100
Message-ID: <2c0e02830811251313k4556c2c4ib13be56b94b5b65b@mail.gmail.com>
On Wed, Nov 26, 2008 at 7:22 AM, Maik Merten <maikmerten at googlemail.com> wrote:
> Silvia Pfeiffer schrieb:
>> In any case - if you (and also Chris Double) are satisfied with the
>> estimates you're getting for file duration/length - I'll stop arguing
>> for it. It would be nice to hear some experimental evidence about how
>> well it's doing, e.g. for typical movie trailers, so we can lay that
>> argument to bed knowing we've done our homework.
>
> I now also account for the bytes in the buffer to compute the current
> playback byte-position and added a status bar showing playback progress.
>
> http://people.xiph.org/~maikmerten/demos/bigbuckbunny-applet-javascript.html
>
> Given that I estimate the duration with outrageous crudeness (no
> averaging) and also compute the slider position without any means to
> ensure it doesn't jump around wildly I think it's pretty smooth - so
> perhaps estimating the duration is in fact a viable fallback if one
> doesn't want to determine the duration "properly".

Nice work!

The duration is indeed jumping quite a bit between 8min and 12 min and
even at the end still has a gap of actual end time of 9m54s while the
estimate is still at 10m44s. Players like YouTube's player display the
duration of the file which is very useful for a consumer to estimate
if they actually have the time to spend on watching the video. So,
even if we don't use the duration/length attribute for calculating the
timeline, it may well be useful metadata for display purposes.

BTW: are you planning to implement seeking on the timeline, too? It
would probably not too bad given the smoothness of the slider
position.

Cheers,
Silvia.
Received on Tuesday, 25 November 2008 13:13:11 UTC

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