Cropping using gstreamer on Netra/Centaurus

Hi,

If this gstreamer is using V4L2 capture, than v4l2 capture has implemented V4L2_S_CROP ioctl to do cropping on incoming frames.

Hi Anuj,

We cannot do inline unscaling, but we can support cropping with the 1x scaling and then captured video can be upscaled using m2m omx or any other component.

Thx,

Brijesh

I missed scaling part, it needs to be done using OMX VFPC component.

Hello Hardik,

In my case i did the following changes to my SDCard created with ezsdk_05_04_00_11,

cp /usr/share/ti/ti-media-controller-utils/load-hd-v4l2-firmware.sh /etc/init.d/load-hd-firmware.sh

After re-boot, I am able to invoke the following decode pipeline

gst-launch-0.10 filesrc location=1080p50.MTS ! mpegtsdemux ! h264parse !  omx_h264dec ! omx_scaler ! 'video/x-raw-yuv,width=1920,height=1080' ! omx_ctrl display-mode=OMX_DC_MODE_1080P_60  ! gstperf ! omx_videosink sync=true

Now the question is:

how to crop left-top 960x540 and scale up to full screen 1920x1080?

Br,

Albert.

Hello Hardik/Brijesh,

Fist of all, my question is related to cropping the input video from the h264 file(not from v4l2 captured external video),

coming back to your question related to omx_vfpc for scaling:

I have tested following gstreamer pipelines:

############################downscaling 1080 video to 720#########################################################

1920x1080 Input  file displayed natively as 1920x1080p video out(video was spanning over the full screen of my fullHD monitor):

gst-launch-0.10 filesrc location=1920x1080p50.MTS ! mpegtsdemux ! h264parse !  omx_h264dec ! omx_scaler ! 'video/x-raw-yuv,width=1920,height=1080' ! omx_ctrl display-mode=OMX_DC_MODE_1080P_60  ! gstperf ! omx_videosink sync=true

1920x1080 Input  file displayed as 1280x720 down scaled(video was looking small in the center on my FullHD monitor, remaining outer boundary was black)

gst-launch-0.10 filesrc location=1920x1080p50.MTS ! mpegtsdemux ! h264parse !  omx_h264dec ! omx_scaler ! 'video/x-raw-yuv,width=1280,height=720' ! omx_ctrl display-mode=OMX_DC_MODE_1080P_60  ! gstperf ! omx_videosink sync=true

############################upscaling 720 video to 1080#########################################################

1280x720 Input  file displayed natively without any scaling(video was looking small in the center on my FullHD monitor, remaining outer boundary was black)

gst-launch-0.10 filesrc location=1280x720p24.MTS ! mpegtsdemux ! h264parse !  omx_h264dec ! omx_scaler ! omx_ctrl display-mode=OMX_DC_MODE_1080P_60  ! gstperf ! omx_videosink sync=true

1280x720 Input  file displayed as 1920x1080p video out(video was spanning over the full screen)

gst-launch-0.10 filesrc location=1280x720p24.MTS ! mpegtsdemux ! h264parse !  omx_h264dec ! omx_scaler ! 'video/x-raw-yuv,width=1920,height=1080' ! omx_ctrl display-mode=OMX_DC_MODE_1080P_60  ! gstperf ! omx_videosink sync=true

with these example, it is clear that up-scale and down-scale with gstreamer omx_scalar component is working fine, So my question is:

why and how  OMX VFPC component plays role in this cropping scenario? as i understood, omx_scalar internally uses OMX.VFPC component(In gstreamer my focus is only on omx_scalar plug-in).

scaling with omx_scalar seems to be working fine in my case, i just need some magic component like omx_cropper which can be used in the following pipeline

gst-launch-0.10 filesrc location=1920x1080p50.MTS ! mpegtsdemux ! h264parse !  omx_h264dec ! omx_cropper width=x height=y ! omx_scaler ! 'video/x-raw-yuv,width=1920,height=1080' ! omx_ctrl display-mode=OMX_DC_MODE_1080P_60  ! gstperf ! omx_videosink sync=true

do we have such a component available? or before invoking my gst-pipeline, do i need to use a small userspace program for configuring the cropping parameters using IOCTL?

btw: one more question

with ezsdk 05.04.00.11, what happens when i replace the following script

cp /usr/share/ti/ti-media-controller-utils/load-hd-v4l2-firmware.sh /etc/init.d/load-hd-firmware.sh?

Is it affecting both capture and display functionalities using v4l2 driver?

thanks and Br,

Albert.

Hi Albert,

Scalar component can do the cropping as well. In ezSDK 54011, cropping is not functional. It will be fixed in next release.

Regards

Vimal

Hello Vimal,

At the moment I need a work-around to demonstrate cropping functionality. Is there any other way I can configure crop parameters(through IOCTL call) before invoking my gstreamer pipeline?

thanks and Br,

Albert.

Albert,

By specifying nOffset in OMX buffer headers startX, startY can be changed. Also If scalar width/height is made as required cropping width/height, It may do the required cropping.

Regards

Vimal