1251889 - vp9 video rendering displays colours incorrectly

Status: RESOLVED DUPLICATE of bug 1190939

(Core :: Audio/Video: Playback, defect, P1)

Description

[Charles Daffern]

Attachment: out.webm

User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:36.0) Gecko/20100101 Firefox/36.0
Build ID: 20150305021524

Steps to reproduce:

Using this source material: https://i.imgur.com/XpLc9KO.png
Generate a vp9 webm with ffmpeg:

wget https://i.imgur.com/XpLc9KO.png
ffmpeg -i XpLc9KO.png -c:v vp9 out.webm
firefox ~+/out.webm

I am testing on Firefox 44.0.2 on Arch Linux x86_64, but this problem has persisted for more than a year so it will affect older versions too.



Actual results:

The resulting video appeared to have the correct luminosity (value?) for all pixels, but it looks like the colours are being overlaid on top at a different size to the rest of the video.

Put another way, you could get a similar effect in gimp by duplicating the layer, doubling the size of the top layer, then setting the top layer's blend mode to colour.

This is the result for me: https://i.imgur.com/kCQCs2p.png


Expected results:

I would expect the resulting (1-frame) video to render identically to the PNG but for some minor compression artifacts.

It does render correctly for me under ffplay, mpv, and chromium.