Firefox, HTML5 and high res. videos

[Ahmad Samir]

On 21 August 2015 at 18:04, Heinz Diehl <htd+ml at fritha.org> wrote:

> Hi,
>
> F22, latest Firefox 40. With standard configuration, I can't play any
> highres video on Youtube (720 or 1080p). When setting
>
>  media.mediasource.enabled
>  media.mediasource.webm.enabled
>
> to "true" as recommended by the Mozilla Community, highres videos play
> just fine. BUT some other videos now do not play any longer. In
> particular, when setting
>
>  media.mediasource.webm.enabled
>
> to "false", those non-working videos work again. But then, no highres
> is possible. Example:
>
> https://www.youtube.com/watch?v=kFzN6j6FjJc

[...]

IIUC, there're two different ways of not using adobe flash to play youtube
videos:
- The HTML5 player uses the gstreamer backend on the system
- The HTML5 player uses the MSE (Media Source Extensions) stuff

to check what's enabled on your setup go to youtube.com/html5.

- If MSE can't work on your system either with webm/VP9 format or with the
mp4/h264 format then it'll fallback to the HTML5 player with the gstreamer
backend

- With the gstreamer HMLT5 player not all resolutions are available, for
example with the gstreamer backend I only get 360p and 720p, and nothing in
between or over that range

- I am not sure but I think that not all videos are available in both webm
and h264 formats

I am not sure what exactly is happening on your system, but I'd try
enabling MSE with h264, make sure these are set to true:
media.fragmented-mp4.enabled
media.fragmented-mp4.exposed
media.fragmented-mp4.ffmpeg.enabled
media.mediasource.mp4.enabled

that should make videos become available with more resolutions.

-- 
Ahmad Samir
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