Re: Gstreamer pipeline problem

[Chris Tapp <opensource@keylevel.com>]

On 10 Jul 2013, at 20:19, Chris Tapp wrote:

> I've got an application which uses playbin2 to capture video. The pipeline is of the form:
> 
> playbin2 uri=... video-sink="queue2 ! videoscale ! video/x-raw-rgb, pixel-aspect-ratio=1/1, width=<capture-width>, height=<capture-height> ! fakesink"
> 
> I then get the "frame" property from the pipeline and use this to grab the latest frame.
> 
> This works on my development system (Ubuntu 11.10) and a Cedar Trail / Yocto system, but the pipeline fails on the Wandboard Quad. I think this is related to:
> 
> 0:00:13.028151336  1349 0x4442d520 WARN           basetransform /media/SSD-RAID/build-danny-wandboard/tmp/work/armv7a-vfp-neon-poky-linux-gnueabi/gstreamer/0.10.36-r2/gstreamer-0.10.36/libs/gst/base/gstbasetransform.c:1304:gst_base_transform_setcaps:<videoscale0x2ab820> transform could not transform video/x-raw-yuv, width=(int)854, height=(int)480, framerate=(fraction)24/1, format=(fourcc)I420, interlaced=(boolean)false in anything we support
> 
> I added an ffmpegcolorspace element betwween the queue2 and the videoscale to get round this and the pipeline now builds, but only a few frames are captured. There are different diagnostics showing:
> 
> 0:00:02.881403000  1361   0x28da60 WARN                  vpudec vpudec.c:914:gst_vpudec_core_create_and_register_frames: Allocate Internal framebuffers!!!!
> Message Callback : Element playbin0x250b68 changed state from READY to PAUSED.
> 0:00:03.237675000  1361   0x28da60 WARN                  vpudec vpudec.c:1578:gst_vpudec_chain: Got no frame buffer message, return 0x89, 8 frames in displaying queue!!
> 0:00:03.242324334  1361   0x28da60 WARN                  vpudec vpudec.c:1578:gst_vpudec_chain: Got no frame buffer message, return 0x89, 8 frames in displaying queue!!
> 
> <lots of repeats>
> 
> 0:00:08.499914334  1382   0x28d860 WARN                  vpudec vpudec.c:1655:gst_vpudec_chain: Retry too many times, maybe BUG!!
> 0:00:08.500784667  1382   0x28d860 WARN                  vpudec vpudec.c:1578:gst_vpudec_chain: Got no frame buffer message, return 0x88, 8 frames in displaying queue!!
> 
> <lots of repeats>
> 
> Message Callback : Element playbin0x250aa0 changed state from PAUSED to PLAYING.
> 0:00:09.253202667  1382   0x28d860 WARN                  vpudec vpudec.c:1578:gst_vpudec_chain: Got no frame buffer message, return 0x88, 8 frames in displaying queue!!
> 
> 0:00:13.364523335  1460   0x142ec0 WARN             mfw_v4lsink mfw_gst_v4l_buffer.c:435:mfw_gst_v4l2_new_buffer: Try new buffer failed, ret 2 No such file or directory queued 0
> 
> 
> The "Message Callback" events are my own logging to try and see what's happening in my app.
> 
> Is this something I'm doing wrong, or are these messages a real issue somewhere?

This is when playing a .webm. The results for an .flv are as expected.

Chris Tapp

opensource@keylevel.com
www.keylevel.com