Video is too yellow/bright, as if a grossly exaggerated gamma transform is applied (raring regression)

Bug #1158594 reported by Max Bowsher on 2013-03-22
This bug affects 1 person
Affects Status Importance Assigned to Milestone
totem (Ubuntu)

Bug Description

Some video files play in totem in raring appearing far too bright and yellowish - the appearance is similar to an excessively strong application of a gamma transform.

To reproduce:

1) Download this video from youtube (~15MB): youtube-dl -f 18

2) Open the downloaded file in totem, and the youtube page in a browser, and play them side by side simultaneously. The difference should be readily apparent, especially in the flaring on the "Game of Thrones" text in the title sequence and in the desert scenery.

Other media players such as vlc, xine-ui render the video correctly.

Max Bowsher (maxb) wrote :

It looks like this may be a totem bug specifically, as if I launch the same file playing simultaneously through totem, gst-launch-0.10 and gst-launch-1.0 by executing the following in a terminal:

totem rUgAgfO-16s.mp4 & gst-launch-1.0 playbin uri=file:///home/maxb/rUgAgfO-16s.mp4 & gst-launch-0.10 playbin uri=file:///home/maxb/rUgAgfO-16s.mp4 &

it is easy to see that only the totem playback displays the abnormal colouring.

Max Bowsher (maxb) wrote :

I think I've discovered mostly what had gone wrong - somehow in the process of going quantal->raring, either the various colour balance settings in totem got changed, or it changed how it interpreted the numerical values in dconf. When I dug around in dconf-editor, I found various colour-related settings under org.gnome.Totem, which, once reset to defaults, caused my display issue to go away.

The problem was exacerbated by bug 1162389 - the totem preferences dialog has become inaccessible - hence why I had to resort to dconf-editor to change them.

Thus, this bug becomes a question of how a visually sensible colour configuration on quantal ended up looking wrong after upgrading to raring.

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