On 3/19/2014 10:37 AM, Aaron F. Ross wrote:
Hi,
Not sure if this is the place to post this or not. If not, please point me in
the right direction.
Thanks for your feedback! :)
I was very excited to see that I can post video to my web page without plugins,
Flash, or Javascript. However, I have identified two issues concerning visual
quality in the Firefox HTML5 video player. I'm an artist, image is everything
to me.
1. Poster image is at reduced contrast. Looks like it's viewed through some
kind of filter. This is bad. Please don't do this. If I create a poster image,
I expect that it will be displayed the same way I created it. This is not an
unreasonable expectation.
Are you sure? Poster images are displayed using the same code that <img>
tags are displayed with. Maybe you're seeing the video controls overlay,
that puts a partially opaque layer over top of the video?
2. MP4 video is being displayed at reduced contrast as well. Blacks are not
black, whites are not white. This probably has something to do with a dynamic
range mismatch between 0-255 (for display/desktop) and 16-235 (for
storage/broadcast). My files are encoded with Handbrake. I assume what is
happening is that the encoder is using the standard 16-235 range, but Firefox
is not correctly expanding that out to 0-255. This is bad. Please fix it.
This is a bug in the YCbCr to RGB colour conversion of your nvidia
graphics card. Tracking in bug 879099:
https://bugzilla.mozilla.org/show_bug.cgi?id=879099
I have reported this bug to nvidia, but seem to have no interest in
fixing it.
There's a work around here:
https://wiki.videolan.org/VSG:Video:Color_nVidia
Cheers,
Chris Pearce
_______________________________________________
dev-media mailing list
[email protected]
https://lists.mozilla.org/listinfo/dev-media
