DM8168 Lossless streaming using Gstreamer

Abhilash Surendran

The platform we are using DM8168 TI EVM with TI provided Linux SDK and PSP.

We need to capture video data from different capture inputs (DVI,HDMI,S-Video, AV,etc) and encode it and stream over ethernet.

Simultaneous streaming of two video channels is required.

For video capturing part we are planning to use TI daughter cards/custom hardware. For streaming we are planning to use Gstreamer.

We checked the TI blog regarding Gstreamer over TCP.

The link is:

http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/717/p/216799/775577.aspx#775577

As per the link, performance issue is observed at ARM side when they tried to stream video using the Gstreamer element ‘tcpserversink’.

Performance improvement was observed when encoded video was streamed, but since we need to stream two HD channels simultaneously this can get worser.

The route cause being pointed out in the blog is ‘not using DMA by the Gstreamer plugin for copying data to network’.

TI has not provided any satisfactory reply in the blog, but they just recommended to use RTP.

Our requirement is to stream video over lossless network medium, hence RTP (using UDP) will not be a choice for us. Please suggest an alternate mechanism for streaming losslessly using Gstreamer in DM8168 and not having any performance impact.

over 12 years ago

0 Margarita Gashova over 12 years ago

TI__Guru* 80190 points

Hello,

What is the software release that you are using here?

What is the omx-gstreamer version also?

In this topic the use case was board side :

filesrc->decoding->streaming on the decoded video.

If I am understanding you right your use case on bard side is:

capturing->encoding->streaming

Is it correct?

Best Regards,

Margarita

0 Abhilash Surendran over 12 years ago in reply to Margarita Gashova

Prodigy 40 points

Hi,

Please find my reply to your queries:

>What is the software release that you are using here?

TI EZSDK v5 is being used here. (http://processors.wiki.ti.com/index.php/EZSDK_Feature_List)

>What is the omx-gstreamer version also?

Gstreamer version available with TI EZSDK v5 is being used.

>If I am understanding you right your use case on bard side is:

>capturing->encoding->streaming

Yes your understanding is correct. This is the desired use case for us at board side.

Regards,

Abhilash.

0 Margarita Gashova over 12 years ago in reply to Abhilash Surendran

TI__Guru* 80190 points

Hello,

You could check here:

http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/717/p/199343/852137.aspx

Useful links:

http://processors.wiki.ti.com/index.php/TI81XX_PSP_VIDEO_CAPTURE_Driver_User_Guide

http://processors.wiki.ti.com/index.php/DM81xx_AM38xx_Adding_External_Decoders_to_V4L2_Capture_Driver

Example pipeline:

gst-launch -e v4l2src device=/dev/video0 queue-size=8 ! video/x-raw-yuv, format=\(fourcc\)NV12, width=1920, height=1080, framerate=\(fraction\)30/1, buffer-count-requested=10 ! gstperf ! \
omx_h264enc output-buffers=6 input-buffers=4 force-idr-period=16 i-period=16 bitrate=16000000 ! rtph264pay ! udpsink host=IP port=XXXX v4l2src device=/dev/video5 always-copy=false\
queue-size=8 ! 'video/x-raw-yuv,format=(fourcc)NV12,width=1920,height=1080,framerate=(fraction)60/1' ! omxbufferalloc numBuffers=8 ! gstperf ! omx_h264enc output-buffers=6 input-buffers=4 \
force-idr-period=16 i-period=16 bitrate=16000000 ! rtph264pay ! udpsink host=IP port=XXXX

Hope this help.

Best Regards,

Margarita

0 Abhilash Surendran over 12 years ago in reply to Margarita Gashova

Prodigy 40 points

Hi Margarita,

Thank you for the inputs and the example pipeline.

But as I mentioned in my post dated 09 July 2013, my requirement is to have a lossless streaming.

The pipeline you suggested above is using 'udpsink 'for streaming and this is definitely a lossy streaming and hence cannot be used.

There performance concern regarding usage of 'tcpserversink' is being mentioned. Could you please go through the post and provide a reply.

Regards,

Abhilash.

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DM8168 Lossless streaming using Gstreamer