Video Decoding on imx6 with Debian

[Rainer Dorsch]

Hello,

does anybody have a working gstreamer pipeline for the imx6 with HW video
decoding?

Following https://trac.gateworks.com/wiki/ventana/vpu I setup the HW and
gstreamer reports

***@mo:~$ gst-inspect-1.0 | grep -P "v4l2.*dec"
video4linux2: v4l2h264dec: V4L2 H264 Decoder
video4linux2: v4l2jpegdec: V4L2 JPEG Decoder
video4linux2: v4l2mpeg2dec: V4L2 MPEG2 Decoder
video4linux2: v4l2mpeg4dec: V4L2 MPEG4 Decoder
***@mo:~$

I also allocated extra cma memory

***@mo:~$ cat /proc/cmdline
console=ttymxc0,115200 quiet cma=256M
***@mo:~$

But I did not manage to get a working h264 playback:

# gst-launch-1.0 filesrc location=/mnt/net/fs/mnt/disk/scratch/xbian/storage/
videos/Erdmännchen/002_Zum_in_die_Luft_gehen.mp4 ! rtph264depay ! v4l2h264dec
! kmssink name=imx-drm sync=0

Which outputs

Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
ERROR: from element /GstPipeline:pipeline0/GstFileSrc:filesrc0: Internal data
stream error.
Additional debug info:
../libs/gst/base/gstbasesrc.c(3132): gst_base_src_loop (): /
GstPipeline:pipeline0/GstFileSrc:filesrc0:
streaming stopped, reason error (-5)
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...

When I use gstreamer's playbin, I get no errors, but the video is not
displayed properly and on the output are messages that the HW is too slow (I
assume in this case the HW decoder is not used).

Any idea or hint is welcome.

Many thanks
Rainer

[Rainer Dorsch]

Hello,

for reference in case somebody reads the archives: I found an answer on the
gstreamer matrix channel

gst-launch-1.0 filesrc location=/mnt/net/fs/mnt/disk/scratch/xbian/storage/
videos/Erdmännchen/002_Zum_in_die_Luft_gehen.mp4 ! qtdemux ! h264parse !
v4l2h264dec ! kmssink

works for me.

Rainer

Post by Rainer Dorsch
Hello,
does anybody have a working gstreamer pipeline for the imx6 with HW video
decoding?
Following https://trac.gateworks.com/wiki/ventana/vpu I setup the HW and
gstreamer reports
video4linux2: v4l2h264dec: V4L2 H264 Decoder
video4linux2: v4l2jpegdec: V4L2 JPEG Decoder
video4linux2: v4l2mpeg2dec: V4L2 MPEG2 Decoder
video4linux2: v4l2mpeg4dec: V4L2 MPEG4 Decoder
I also allocated extra cma memory
console=ttymxc0,115200 quiet cma=256M
# gst-launch-1.0 filesrc
location=/mnt/net/fs/mnt/disk/scratch/xbian/storage/
videos/Erdmännchen/002_Zum_in_die_Luft_gehen.mp4 ! rtph264depay !
v4l2h264dec ! kmssink name=imx-drm sync=0
Which outputs
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
ERROR: from element /GstPipeline:pipeline0/GstFileSrc:filesrc0: Internal
data stream error.
../libs/gst/base/gstbasesrc.c(3132): gst_base_src_loop (): /
streaming stopped, reason error (-5)
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...
When I use gstreamer's playbin, I get no errors, but the video is not
displayed properly and on the output are messages that the HW is too slow (I
assume in this case the HW decoder is not used).
Any idea or hint is welcome.
Many thanks
Rainer