Dear Support, I’ve done everything I can imagine, and can’t stop the iframes from pulsing on any camera that I try - from MIPI to USB. Here is my pipeline: TX: gst-launch-1.0 pylonsrc ! video/x-raw,width=2560,height=1440,format=UYVY ! nvvidconv ! nvv4l2h264enc bitrate=50000000 control-rate=0 vbv-…

@mark_umina , sorry if my post wasn’t clear. The low bitrate pulsing was related to omx encoders, not nvv4l2 ones. With nvv4l2h264enc, excessive bitrate may result in some pulsing. My advice of 30M would work with Main or High profile, but would lead to pulsing with baseline. Reducing the bitrate wo…

Hi, We suggest set vbv-size in bitrate/fps ~ 2*(bitrate/fps). Your bitrate is 50Mbps and for 30fps, may set in the range 1666666 ~ 3333333.

[image] DaneLLL: 3333333 Hi @DaneLLL Thank you for the response. I’ll give this a try tomorrow in the daylight.

Hi @DaneLLL I have tested with the suggested buffer sizes on the pipeline in my original post. it caused the digitization to get far worse. Please let me know what other suggestions you may have. So far we are not seeing great results using the nvv4l2h264enc/nvv4l2h264enc encoders, and the omxh26…

Hi @DaneLLL I’ve tried the suggestion above. Both of these pipelines increase digitization to create an almost unusable picture: gst-launch-1.0 pylonsrc ! video/x-raw,width=2560,height=1440,format=UYVY ! nvvidconv ! nvv4l2h264enc bitrate=50000000 control-rate=1 vbv-size=3333333 iframeinterval=30 …

Hi, Another possible solution is to run in VBR mode and set qp-range: qp-range : Qunatization range for P, I and B frame, Use string with values of Qunatization Range in MinQpP-MaxQpP:MinQpI-MaxQpI:MinQpB-MaxQpB order, to set the prope…

Hi @DaneLLL That’s very interesting, and something I haven’t tried. I’ll give that a run in the morning when there’s light. Thanks!

I tried this and still had a lot of trouble with it. I have again tested the nvv4l2h264/5enc using different cameras and I still see the same issues with pulsing on Iframes and digitization being very frequent regardless of bit rate. I have moved away from them and onto the omxh265enc again, which …

[image] mark_umina: What steps can I take to ensure fastest frame processing rate using the omxh265enc? I am away from any jetson and cannot check, but you would find ultra fast preset option with: gst-inspect-1.0 omxh265enc [image] mark_umina: So far the omxh265enc seems to ignore the …

Hi @Honey_Patouceul Thanks for the response! I’m using 1 for FastPreset, because 0 appears very grainy: (0): UltraFastPreset - UltraFastPreset for high perf (1): FastPreset - FastPreset (2): MediumPreset - M…

H.264/5 iframe pulsing

Robotics & Edge Computing Jetson Systems Jetson Nano

DaneLLL April 21, 2021, 4:21am 6

Hi,
control-rate=0 is VBR mode. Please set control-rate=1 along with vbv-size and try again.

The commands in the post are corrected.

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H.264/5 iframe pulsing

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