Modify h264 encode frame rate doesn't work!!

maik maa

Intellectual 400 points

Hi,

I'm trying to change h264 encode fps to 20(use 8148 with DVRRDK3.0 McFW multi-chan usecase),

modify the following parameters:

Venc_setInputFrameRate(chId, 30 );

params.frameRate = 20;

Venc_setDynamicParam(chId, 0, &params, VENC_FRAMERATE);

and also set the related params,

pLinkDynPrm->intraFrameInterval = 20;

pLinkChPrm->encodingPreset = XDM_USER_DEFINED;

(encLink_h264.c)

staticParams->vuiCodingParams.vuiCodingPreset = IH264_VUICODING_USERDEFINED;
staticParams->vuiCodingParams.hrdParamsPresentFlag = 1;
staticParams->vuiCodingParams.timingInfoPresentFlag = 1;

the encode file size would be smaller than 30 fps file,

and I use h264 tool to get:

MaxFPS =40 (time_scale=40000, num_units_in_tick=1000)

and it has I frame in every 20 frames,

It's truly became 20 frames per second by counting step by step,

but played by VLC player will be fast forward,

how to solve this problem? thanks.

over 12 years ago

0 Badri Narayanan over 12 years ago

TI__Guru 59700 points

Check the encoded bitstream with a H264 stream analyzer to see if the frame rate info is correct.

0 maik maa over 12 years ago in reply to Badri Narayanan

Intellectual 400 points

Hi,

I check the encode file with h264 tool and info from VLC,

and I got fps(MaxFPS)= 40,

Is that means I lost some information in h264 header,

Does DVRRDK really support modify fps to 20 or lower?

How exactly to do that?

0 Badri Narayanan over 12 years ago in reply to maik maa

TI__Guru 59700 points

Attach the encoded bitstream.

0 maik maa over 12 years ago in reply to Badri Narayanan

Intellectual 400 points

http://e2e.ti.com/cfs-file.ashx/__key/communityserver-discussions-components-files/716/8883.fps20.7z

Thanks~

0 Badri Narayanan over 12 years ago in reply to maik maa

TI__Guru 59700 points

The bitstream has correct info. The H264 stream analyzer like Elecard correctly detects the frame rate as 25. This could be issue with VLC ffmpeg H264 decoder detecting the correct frame rate.

0 maik maa over 12 years ago in reply to Badri Narayanan

Intellectual 400 points

Hi,

"Elecard correctly detects the frame rate as 25", do you mean by the MaxFPS=25,

I can't find any else parameter that indicates frame rate.

I'm also use Elecard, but I got MaxFPS=40, how is that happen??

I try update to the newest version of VLC player to this file, it also doesn't work(also fast forward),

and I can find others player able to play this h264 file, any suggestion?

0 Badri Narayanan over 12 years ago in reply to maik maa

TI__Guru 59700 points

Elecard stream analyzer shows the declared frame rate and actual frame rate correctly as 20. If you set frame rate as 30 does VLC play it correctly at 30 fps. If 30 fps works fine ,share encoded stream encoded with taargetFrameRate at 30

0 maik maa over 12 years ago in reply to Badri Narayanan

Intellectual 400 points

Here is the encode file with fps 30, and VLC play it correctly, thankshttp://e2e.ti.com/cfs-file.ashx/__key/communityserver-discussions-components-files/716/6406.fps30.7z

0 Badri Narayanan over 12 years ago in reply to maik maa

TI__Guru 59700 points

VLC shows framerate as 60 for the 30 fps stream you attached.

0 maik maa over 12 years ago in reply to Badri Narayanan

Intellectual 400 points

The file as 30 fps can be played by VLC, but 20 fps is not, how is that happen?

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Modify h264 encode frame rate doesn't work!!