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airmax / v4l2loopback

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Assertion error in gst_v4l2sink_sync_overlay_fields #23

Open GoogleCodeExporter opened 8 years ago

GoogleCodeExporter commented 8 years ago 
Hi,
I try to use gstreamer to use the internal cam of my n900 as a webcam, this is 
my setup:
* on the n900 I'm running:
  gst-launch v4l2src device=/dev/video0 ! videoscale ! video/x-raw-yuv,width=320,height=240 ! ffmpegcolorspace ! smokeenc ! \
  udpsink host=$DESKTOP_HOST port=$PORT

* on my desktop:
  gst-launch udpsrc port=$PORT ! smokedec ! v4l2sink device=/dev/video0

/dev/video0 is the v4l2loopback device.

I'm using the v4l2loopback 0.3.1-1 package from ubuntu natty.

% LANG=C gst-launch -vvvv udpsrc port=$PORT ! smokedec ! v4l2sink 
device=/dev/video0
Setting pipeline to PAUSED ...
libv4l2: error getting pixformat: Invalid argument
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
/GstPipeline:pipeline0/GstSmokeDec:smokedec0.GstPad:src: caps = 
video/x-raw-yuv, format=(fourcc)I420, width=(int)320, height=(int)240, 
framerate=(fraction)2993/100

** (gst-launch-0.10:4842): CRITICAL **: gst_v4l2sink_sync_overlay_fields: 
assertion `v4l2_ioctl (fd, VIDIOC_G_FMT, &format) >= 0' failed
/GstPipeline:pipeline0/GstV4l2Sink:v4l2sink0.GstPad:sink: caps = 
video/x-raw-yuv, format=(fourcc)I420, width=(int)320, height=(int)240, 
framerate=(fraction)2993/100

And when using mplayer on /dev/video0 I get:

% mplayer -fps 15 tv:// -tv  driver=v4l2:device=/dev/video0
MPlayer 1.0rc4-4.4.5 (C) 2000-2010 MPlayer Team
mplayer: could not connect to socket
mplayer: No such file or directory
Failed to open LIRC support. You will not be able to use your remote control.

Playing tv://.
TV file format detected.
Selected driver: v4l2
 name: Video 4 Linux 2 input
 author: Martin Olschewski <olschewski@zpr.uni-koeln.de>
 comment: first try, more to come ;-)
Selected device: Dummy video device
 Capabilites:  video capture  video output  read/write  streaming
 supported norms: 0 = NTSC; 1 = NTSC-M; 2 = NTSC-M-JP; 3 = NTSC-M-KR; 4 = NTSC-443; 5 = PAL; 6 = PAL-BG; 7 = PAL-H; 8 = PAL-I; 9 = PAL-DK; 10 = PAL-M; 11 = PAL-N; 12 = PAL-Nc; 13 = PAL-60; 14 = SECAM; 15 = SECAM-B; 16 = SECAM-G; 17 = SECAM-H; 18 = SECAM-DK; 19 = SECAM-L; 20 = SECAM-Lc;
 inputs: 0 = loopback;
 Current input: 0
 Current format: YUV420
v4l2: ioctl set format failed: Invalid argument
Selected input hasn't got a tuner!
v4l2: ioctl set mute failed: Invalid argument
v4l2: ioctl query control failed: Invalid argument
v4l2: ioctl query control failed: Invalid argument
v4l2: ioctl query control failed: Invalid argument
v4l2: ioctl query control failed: Invalid argument
open: No such file or directory
[MGA] Couldn't open: /dev/mga_vid
open: No such file or directory
[MGA] Couldn't open: /dev/mga_vid
[VO_TDFXFB] Can't open /dev/fb0: No such file or directory.
[VO_3DFX] Unable to open /dev/3dfx.
==========================================================================
Opening video decoder: [raw] RAW Uncompressed Video
Movie-Aspect is undefined - no prescaling applied.
VO: [vdpau] 320x240 => 320x240 Planar I420 
Selected video codec: [rawi420] vfm: raw (RAW I420)
==========================================================================
Audio: no sound
FPS forced to be 15.000  (ftime: 0.067).
Starting playback...
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?
Frame too small! (76800<115200) Wrong format?

MPlayer interrupted by signal 2 in module: sleep_timer
V:   0.0  39/ 39  0%  0%  0.0% 0 0 

MPlayer interrupted by signal 2 in module: free_demuxer

I'm not sure where exactly the problem is, but for me it looks like the looback 
device is not working with the v4l2sink.

I'm more than happy to help debuggingthis furth.
Thanks for your help.

Original issue reported on code.google.com by markus.k...@gmail.com on 22 Dec 2010 at 2:11

GoogleCodeExporter commented 8 years ago 
Hi, i have the same problem. Any news?

Original comment by nicola.c...@gmail.com on 5 Nov 2011 at 3:48