topic Re: xvimagesink0: Could not initialise Xv output in i.MX Processors

xvimagesink0: Could not initialise Xv output

javierrodriguez — Thu, 03 Jan 2013 16:19:56 GMT

Hi there!

I am a really newbie freescale user and I am getting an issue with the videosink element in gstreamer.

I am using a iMX6Q Sabrelite with a Ubuntu 12.09 within.

I have modified the v4l2 kernel module in order to detect the Logitech c920 Webcam. This webcam is able to capture video with H264 hardware in HD (1080p). With a program I have captured the raw NALs into a file.

Now, I can reproduce the video using the vpu decoder. The video plays smoothly and the system is using less than 10% of the CPU. It works fine but the gstreamer is using the v4l_sink by default. This sink puts the video directly within the framebuffer device so the system draws the image on the desktop without using a window. This is a real problem because I am working on an application that uses this and I need to display the video in a window.

I have tried to use the "xvimagesink" instead of "autovideosink" but I got this error:

$ gst-launch-0.10 filesrc location=test.h264 ! h264parse ! vpudec ! xvimagesink

Setting pipeline to PAUSED ...

ERROR: Pipeline doesn't want to pause.

ERROR: from element /GstPipeline:pipeline0/GstXvImageSink:xvimagesink0: Could not initialise Xv output

Additional debug info:

xvimagesink.c(1428): gst_xvimagesink_get_xv_support (): /GstPipeline:pipeline0/GstXvImageSink:xvimagesink0:

No port available

Setting pipeline to NULL ...

Freeing pipeline ...

It is very extrange. I have installed all xorg modules thate using the Xv but it does still not working.

If I execute the command xvinfo, I get this:

X-Video Extension version 2.2

screen #0

no adaptors present

What do you think about it?.

Thank you very much.

Re: xvimagesink0: Could not initialise Xv output

daiane_angolini — Mon, 21 Jan 2013 13:13:51 GMT

have you tried using ximagesink? (and not xVimagesink)

Re: xvimagesink0: Could not initialise Xv output

javierrodriguez — Tue, 22 Jan 2013 12:00:07 GMT

The problem is that the vpudec module, throws the data in yuv format and the Ximagesink requires the data in rgb so if I want to use them together I have to convert the image via software (ffmpegcolorspace gstreamer module) and this is very expensive for the board.

Currently, I have gave up this approach and I am working with the frame buffer (resizing) to be able to put it within a gtk window previously designed by me.

I know that this is not the best solution but I spent 1 week searching for information to solve my issue and nobody could help me.

Thank you very much for you answer Daiane.

Re: xvimagesink0: Could not initialise Xv output

daiane_angolini — Tue, 22 Jan 2013 17:07:32 GMT

Thanks for letting me know.

I´m not used with Ubuntu rootfs, but I know totem works very well with FSL decoders, so it´s not impossible,

Re: xvimagesink0: Could not initialise Xv output

javierrodriguez — Tue, 22 Jan 2013 17:18:06 GMT

Hi,

I was debugging totem and I discovered that totem, resize and adjust the frame buffer to the black rectangle when it playbacks a video and andjust the frame buffer to fullscreen when you configure it to view the same video in full screen. It is not a very good solution but it is a solution indeed.

It is very easy to adjust the output with gstreamer if you use the mfw_v4lsink video sink module.

Thank you.