glcolorconvert: fix non-passthrough of RGB -> RGB
On i.MX we're always drawing EGLImages once since textures
are imported from dma-bufs that can't be re-exported.
When input and output are both RGB GStreamer tries to compile
a shader for the purpose, but the alpha channel mapping is
- input is same format as output
- that same format is only 3 chars
The channel map must always be 4 chars long, one char for
each of R G B A.
1 file changed