How to improve video quality of H.264 Encoder on DM365

0755.h264_files.rar

I don't know why but there has been a problem while uploading the h264 compressed files.

I am attaching the files now; you can find the encoded files by both TI encoder and ffmpeg encoder.

Thanks in advance,
Fikret

Hi Fikret,

You are comparing PC encoder with DM365, There will be lot of things matters like DM365 will use less resources and minimal power and achieves realtime encoding.In realtime encoding there will always compromise between speed performance Vs Quality. For ex: motion search range  and number of ref frames matters in P frame encoding.

And we seen your 2 videos from ffmpeg and DM365, ffmpeg video encoded with B frames and 5 ref frames while DM365 has single ref and no B frames. Try by encoding ffmpeg video IPP, single ref, and reduced search range encoding. With this you may minimal diff but not same quality.

Thanks,

Veeranna

Dear Veeranna,

Thank you for your answer. Ok, you are right, one of them is real-time and the other is a PC encoder, but before this comparison with the exactly same video frontend (input),  I have compared TI encoder and another embedded encoder from another company. The encoded video with TI encoder is blurry while the encoded video with the other embedded encoder is more sharper and clear for the same bitrate. That's why I made this comparison.

Let me ask in a different way. I don't wait exactly the same quality with ffmpeg, but if you notice the quality difference is very obvious and according to me there is a sharpness problem or blurriness problem in the encoded video with TI encoder. What can I do to solve this problem? Did you check my encoder parameters, are they correct? Or do you have some recommendations for the encoder parameters? 

I have also seen a document SPRAB83 - Smart Codec Features of DM365 which explains some enhancements such as multi-pass encoding, does it help to me? Please share your recommendations with me.

Thanks&Best Regards,

Fikret

Hi Fikert,

Can you try by setting below params. And hope you are using latest encoder (02.30.00.04), if not download it from

http://software-dl.ti.com/dsps/dsps_public_sw/codecs/DM36x/index_FDS.html

Params

setp h264enc1 EncQuality 1

setp h264enc1 airRate 0

setp h264enc1 perceptualRC 0

setp h264enc1 idrFrameInterval 0 or make it overlap to intraframe interval

Thanks,

Veeranna

Dear Veeranna,

We were not using the latest encoder version, the version was 02.20.00.01. So I have updated the codec version and the parameters you recommended. Now, there is an enhancement in the video quality. It can be seen by visually or with the measurements. Here is the bitrate of the new encoded file with DM365;

The PSNR measurement of newly encoded file and ffmpeg is given below;

The SSIM measurement of dm365 and ffmpeg is given below;

The measurements for the previously encoded file and the newly encoded file are given for a comparison as follows;

The PSNR;

The SSIM;

And the frame 110 of the new encoded file is given below;

As it can be seen both visually and by measurements, there is an improvement in the video quality with these new settings. But when I compare the video quality with the other embedded encoder, it is still sharper and clearer. The blurring problem of TI encoder is improved when compared to the previous one, but as I said still the other one is better. I am going to share two clips from both TI encoder and the other embedded encoder.

What I want to ask is if there is a possibility for further improvement of the video quality? In my previous post, I asked about the smart encoder features; multi-pass encoding or region based encoding, do they help to us for a better video quality? Or any other parameter tuning? Or the last possibility, this is all that we can do for the quality? :) 

Thank you for your support Veerena.

Best Regards,

Fikret

1321.encoded_video.rar

Hi again,

Here are the sample encoded video clips for the benchmark product and dm365 encoder. As it can be seen, the video is sharper and clearer in the benchmark. The edges are noisy in DM365 encoded video and still there is a blurriness problem. Movie player can be used to watch the videos. Are there anything we can do in order to prevent this problem?

Thanks &Best Regards,

Fikret

Any updates?

Hi,

We are looking into videos shared by you. Just to conform can you please tell how you generated the dm365 video? because it has B frames.(I guess you recorded the video while displaying the DM365 output)

Hi Veerana,

I have recorded both videos by using VLC over RTSP, but I've only recorded, not displayed. Do you want me to record both encoders with an NVR?

Thanks&Best Regards,

Fikret

Hi Fikret,

Recording with VLC will actually do re-encoding. Pls try to give the original encoded content of DM365 and the benchmark device, I think the NVR will do that job.

regards

Yashwant

Dear Yashwant,

Attached, you can find the new clips that are directly recorded for DM365 and benchmark product. Thank you for your helps.

Best Regards,

Fikret

5633.new_h264clips.rar

Dear Yashwant and Veerenna,

Did you check the clips? Any recommendations?

Thanks&Best Regards,

Fikret

Hi Fikret,

Thanks, we are looking into the issue. Can you also tell the data flow in both the cases ? Wanted to understand if there are other module before video encoding which are different in these two platforms.

regards

Yashwant

Dear Yashwant,

For TI platform, we do not perform anything before or after video encoding; just simple video encoding operation is performed, no analytics or any kind of enhancements.

For the other platform, there is an SoC from another company. So I don't know if they have used extra modules or not. But if you want, I can share the IC part number of the SoC.

Best Regards,

Fikret

Dear Yashwant,

Any updates or recommendations?  We are waitin for your answer in order to proceed. Thanks in advance.

Best Regards,

Fikret Alim

According to the encoding skill of your bitstream, I think the benchmark encoder should be Amba's encoder.