[Bug 686041] uvch264_src fails with Unknown auxiliary stream format : .=?UTF-8?Q?=EF=BF=BD?=/}

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=686041
  GStreamer | gst-plugins-bad | 0.10.x

Jami Pekkanen <jami.pekkanen> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |UNCONFIRMED
         Resolution|NOTGNOME                    |

--- Comment #8 from Jami Pekkanen <jami.pekkanen at helsinki.fi> 2012-10-23 23:32:39 UTC ---
Reopening, as an alternative approach to recording the video[1] doesn't exhibit
the behavior. It may still be a bug elsewhere, as this approach doesn't show
the viewfinder stream, so the USB bandwidth isn't as large, but I think it
still hints that the bug could be in uvch264. And I'm able to reproduce the bug
also with the "official" pipeline described in[2], but with dumping the h264
frames to a filesink:

GST_DEBUG=6 gst-launch uvch264_src device=/dev/video0 name=src auto-start=true
src.vfsrc ! queue ! "video/x-raw-yuv,width=320,height=240,framerate=30/1" !
xvimagesink src.vidsrc ! queue !
video/x-h264,width=1920,height=1080,framerate=30/1,profile=constrained-baseline
! h264parse ! filesink location=test.h264

I've attached 100 lines before and after the element posts the error (the whole
log with GST_DEBUG=6 is 27 MB), but I'll post more if needed.

With xvimagesink it doesn't seem to crash (at least as often), could that be
because it's able to drop frames? Anyway I guess this shouldn't be the behavior
on buffer over/underruns?

BTW, when trying to reproduce, it usually takes many minutes minutes to get the
first crash and then the frequency seems to increase.

The problem may start with uvcvideo dropping frames (the USB isochronous frame
lost (-18) messages in the uvcvideo logs) (The journal-messages were a bit of a
suspect, but the bug occurs also with journaling disabled).



[1]
http://www.oz9aec.net/index.php/gstreamer/473-using-the-logitech-c920-webcam-with-gstreamer
[2]
http://kakaroto.homelinux.net/2012/09/uvc-h264-encoding-cameras-support-in-gstreamer/

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