TVMR Framerate significance and working

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX2
1

Hi,
I’m opening the stream using OpenCV 3.3.1 on Jetson TX2.
It’s giving me TVMR logs as output.

NvMMLiteOpen : Block : BlockType = 261 
TVMR: NvMMLiteTVMRDecBlockOpen: 7647: NvMMLiteBlockOpen 
NvMMLiteBlockCreate : Block : BlockType = 261 
TVMR: cbBeginSequence: 1179: BeginSequence  1280x720, bVPR = 0
TVMR: LowCorner Frequency = 100000 
TVMR: cbBeginSequence: 1529: DecodeBuffers = 2, pnvsi->eCodec = 4, codec = 0 
TVMR: cbBeginSequence: 1600: Display Resolution : (1280x720) 
TVMR: cbBeginSequence: 1601: Display Aspect Ratio : (1280x720) 
TVMR: cbBeginSequence: 1669: ColorFormat : 5 
TVMR: cbBeginSequence:1683 ColorSpace = NvColorSpace_YCbCr601
TVMR: cbBeginSequence: 1809: SurfaceLayout = 3
TVMR: cbBeginSequence: 1902: NumOfSurfaces = 9, InteraceStream = 0, InterlaceEnabled = 0, bSecure = 0, MVC = 0 Semiplanar = 1, bReinit = 1, BitDepthForSurface = 8 LumaBitDepth = 8, ChromaBitDepth = 8, ChromaFormat = 5
TVMR: cbBeginSequence: 1904: BeginSequence  ColorPrimaries = 2, TransferCharacteristics = 2, MatrixCoefficients = 2
Allocating new output: 1280x720 (x 9), ThumbnailMode = 0
OPENMAX: HandleNewStreamFormat: 3464: Send OMX_EventPortSettingsChanged : nFrameWidth = 1280, nFrameHeight = 720 
TVMR: FrameRate = 15

Can I know what the TVMR does?
What the framerate signifies?
Because as the time flies, the Framerate slows down.

2

Hi pharatekomal,
The framerate is printed based on the timestamps of input frames. It shows your input is getting slow.

3

Okay…
Can I know if I can retrieve the framerate given by TVMR using some code?
Also…Can I rely on the framerate parameter to conclude if the stream is getting slowed down ?

4

Hi DaneLLL,
Can I get some code to test TVMR working on jetson?

5

Hi pharatekomal,
Not sure what your reuest is. Do you mean you suspect the frame rate prints of TVMR is wrong?

6

TVMR prints are right.
But I’m not sure about the reason behind the slow framerate.
So if I get any C language code or some script, may be I will be able to check if my camera is working fine.

7

@DaneLLL,
I hope you are getting my doubt…
Can I expect any reply?

8

Hi pharatekomal,
You may run ‘your_source ! appsink’ and check timestamps frame by frame.

Some samples of linking appsink:
[url]https://devtalk.nvidia.com/default/topic/1011376/jetson-tx1/gstreamer-decode-live-video-stream-with-the-delay-difference-between-gst-launch-1-0-command-and-appsink-callback/post/5160929/#5160929[/url]
[url]NVMM memory - Jetson TX1 - NVIDIA Developer Forums