AM5728: Artifacts in JPEG encoded frame

Steven Springman

Part Number: AM5728

Hi all,

We've noticed an issue with the jpeg encoder when the height of the frame is not divisible by 16 (1080p, 360p, etc). There are some green-coloured lines at the very bottom of the image. Information and steps to reproduce are below:

Dev kit: Both AM57xx evm and AM571x idk

SDK version: TI processor SDK, v06.00.00.07

To reproduce, simply run the gst pipeline below and view the output:

gst-launch-1.0 videotestsrc num-buffers=1 ! video/x-raw,format=NV12, width=1920, height=1080, framerate=30/1 ! ducatijpegenc ! filesink location=/tmp/output.jpg

Attached are jpg files with this pipeline run at 1080p and 360p (it is a little easier to see at 360p). Also attached is a png file zoomed in on the artifacts.

high-quality jpeg encoded video is critical for some our upcoming products, so this is a blocker for us.

Thanks,

Steve

1080p Image:

360p:

Zoomed in:

over 4 years ago

0 Krunal Bhargav34 over 4 years ago

TI__Mastermind 35615 points

Hi Steve,

I am able to replicate the same issue and I am internally checking with our developers. I will get back to you within 24-48 hours.

Regards,
Krunal

0 Krunal Bhargav34 over 4 years ago in reply to Krunal Bhargav34

TI__Mastermind 35615 points

Hi Steve,

Based on my internal discussion, this is a known limitation of ducatijpegenc plugin and I recommend to align the width and height with vpe. For example, please refer to the following pipeline:

gst-launch-1.0 videotestsrc num-buffers=1 ! video/x-raw,format=NV12, width=1920, height=1080, framerate=30/1 ! vpe ! video/x-raw,format=NV12, width=1920, height=1088, framerate=30/1 ! ducatijpegenc ! filesink location=/tmp/output.jpg

Regards,
Krunal

0 Steven Springman over 4 years ago in reply to Krunal Bhargav34

Prodigy 60 points

Hi Krunal,

Can you confirm this is an issue with the IVA-HD hardware and not a gstreamer/software issue? Unfortunately stretching the height to 1088 is not a good resolution for us because it would require us to distort the image when playing from a live 1080p camera source.

BR,

Steve

0 Krunal Bhargav34 over 4 years ago in reply to Steven Springman

TI__Mastermind 35615 points

Hello Steve,

This is a limitation with the JPEG IVAHD encoder and the width/height has to be a multiple of 16.

Regards,
Krunal

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AM5728: Artifacts in JPEG encoded frame