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I'm trying to output video content on the Pi without X11. I'd like to use tvservice to set the resolution settings then be able to run pipelines like this:

gst-launch-1.0 videotestsrc ! videoconvert ! fbdevsink

I see that /dev/fb0 exists, and I can write to it without errors, e.g.:

cat `which bash` > /dev/fb0

But I just end up with a blank screen. My gpu_mem in config.txt is set to 128meg. If it matters my current tvservice is:

state 0x120006 [DVI CEA (16) RGB lim 16:9], 1920x1080 @ 60.00Hz, progressive
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It turns out this issue had to do with having called tvservice to change the screen resolution. Apparently after this is done a corresponding call needs to be made to fbset.

So for example if I go to DMT mode 16 (1920x1080):

tvservice -e "DMT 16

I need to follow that up with:

fbset -g 1920 1080 1920 1080 16

Now fbdevsink works. omxplayer seems to work regardless because it somehow goes around the frame buffer.

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