mielikki.g at gmail
Sep 19, 2007, 7:39 PM
Post #3 of 3
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Re: Kernel 2.6.22 problem: ivtv-fb works for X but gives black screen with audio on video playback
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I had the exact same problem (gentoo kernel 2.6.22 with itvt, the
gentoo package for ivtv-fb wouldn't work so I got the tar ball and
manually copied the ivtv-driver.h header over). The same black
rectangle problem as described. (I'm not using X over the framebuffer
though -- I have X and mythtv on a small LCD monitor next to the TV.
The PVR-350 output goes to the TV.)
If I have "options ivtv_fb osd_compat=1" then I get no video -- the
entire screen is black. If I leave off the "options ivtv_fb
osd_compat=1" then I get video but with a large black rectange
obscuring most of the video.
Unfortunately, the ivtvfbctl program does not get built (and I read
something that said it isn't updated for ivtv-1.0.x yet). Fortunately
I found pointers on using v4l2-ctl.
Looking at the current settings, I see:
# v4l2-ctl --get-fmt-output-overlay
Format Video Output Overlay:
Left/Top : 0/0
Width/Height: 0/0
Field : Any
Chroma Key : 0x00000000
Global Alpha: 0xff
Clip Count : 0
Clip Bitmap : No
# v4l2-ctl --get-fbuf
Framebuffer Format:
Capability : Extern Overlay
Chromakey
Global Alpha
Local Alpha
Flags : Global Alpha
Base : 0x0xed510000
Width : 0
Height : 0
Pixel Format :
So I did "v4l2-ctl --set-fmt-output-overlay=global_alpha=0" and that
got rid of the black rectangle. Does that sound right?
I still can't use it with mythtv yet (Can't initialize video / IVD
Error: Framebuffer number query failed. / eno: Invalid argument (22) /
Did you load the ivtv-fb Linux kernel module?) but that's another
error for another time.
On 9/10/07, Stanley Merkx <ivtv [at] merkx> wrote:
> > I am trying to upgrade my mythtv box to the latest 2.6.22 kernel and
> > latest
> > ivtv drivers and latest myth. But I'm having a little trouble with the
> > ivtv_fb driver...
> >
> > Here is what I've got running now.
> >
> > --> ivtv drivers from the 2.6.22 kernel. ( these load without errors and
> > look to be working ok )
> >
> > --> ivtv-fb compiled from the 1.0.2 tar ball -- ( NOTE: I did have to
> > manually copy the correct ivtv-driver2.h to ivtv-driver.h because it
> > wouldn't load when it used the ivtv-driver1.h -- I think this has
> > something
> > to do with the way detection of the 2.6.22 kernel is done. I'm running
> > GENTOO BTW.) But the frame buffer loads now without errors
> >
> > --> IVTV X driver compiled from source downloaded from subversion
> >
> > X and mythfront end run great over the frame buffer, but playback using
> > the
> > PVR-350 decoder doesn't work..
> >
> > Trying to troubleshoot the problem -- I went back to the command prompt
> > and
> > played the video using
> >
> > cat file.mpg > /dev/video16
> >
> > This works great before I load the ivtv-fb driver, BUT once I load the
> > ivtv-fb driver ( with modules.conf: options ivtv_fb osd_compat=1 )
> >
> > The playback gives me a just a black screen -- although I can hear the
> > audio...
> >
> > So I think the problem is the ivtv-fb driver... --
> >
> > Am I testing this properly?? Or am I missing some command that needs to be
> > run to tell the fb to switch from showing the X content to allow the video
> > to be played??
> >
> > This all worked under earlier kernel and older ivtv versions ( actually I
> > think I was using ivtvdev driver not the X ivtv driver... )
> >
> > I saw some people saying Xv with ivtv would allow playback over the ivtv
> > frame buffer without using the PVR-350 decoder, but I don't know how to
> > get
> > Xv working with the ivtv-fb. If anyone can explain that I'll give that a
> > try, but when I tried running myth playback without the 350 decoder to the
> > ivtv X driver the video is very very choppy.. Maybe Xv would help that,
> > but the way I had it working before with the HW decoding was so nice I'd
> > really rather get that working.
> >
> >
> > DMESG OUTPUT looks clean to me..
> > -----------------------------------------------------
> > ivtv0-fb: === Display mode change ===
> > ivtv0-fb: Display size 720x480 (720x480 Virtual) @ 32bpp
> > ivtv0-fb: Display position 1,1
> > ivtv0-fb: Display filter : on
> > ivtv0-fb: Color space : RGB
> > ivtv0-fb: Running in compatibility mode. Display resize & mode change
> > disabled
> > ivtv0-fb: Framebuffer registered on ivtv card id 0
> > -----------------------------------------------------
> >
> >
> > Appreciate any suggestions...
> > _______________________________________________
> > ivtv-users mailing list
> > ivtv-users [at] ivtvdriver
> > http://ivtvdriver.org/mailman/listinfo/ivtv-users
>
> Probably the OSD (=X) is covering the output produced by the decoder.
>
> Try this:
> ivtvfbctl -d /dev/fb0 -l off
> ivtvfbctl -d /dev/fb0 -g off
>
> Hope this helps...
>
> Regards,
> Stanley.
>
>
> _______________________________________________
> ivtv-users mailing list
> ivtv-users [at] ivtvdriver
> http://ivtvdriver.org/mailman/listinfo/ivtv-users
>
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