Iframeinterval doesn't seem to work

[user100090]

I am trying to see what knobs I can tune to lower the network bandwidth when using h265 lossless streaming.

In below test, I just use bunch of png files we captured to provide h265 lossless streaming.

$ test-launch 'multifilesrc location="%07d_0.png" caps="image/png,framerate=13/1" ! pngdec ! nvvidconv ! nvv4l2h265enc enable-lossless=true iframeinterval=30 ! rtph265pay name=pay0 pt=96'

I tried iframeinterval from 1 to 1000, but that doesn’t seem to make any difference on the network bandwidth usage when I watch the stream from a client on the same LAN using VLC player. Is this flag a no-op in JP 4.6.1?

BTW, I also tried h264 but found nvv4l2h264enc enable-lossless=true and nvv4l2h264enc enable-lossless=false use about same network bandwidth, so I assume the property enable-lossless is probably a no-op for h264 in JP 4.6.1. Can someone confirm?

[DaneLLL]

Hi,
For lossless encoding the bitrate cannot be changed. If you need to control bitrate, please set to YUV420 for video encoding.

[user100090]

@DaneLLL

For lossless encoding the bitrate cannot be changed.

With nvv4l2h265enc, even if setting enable-lossless to false, if I then adjust iframeinterval from 1 to 1000, it does NOT make a difference with bandwidth usage.

[DaneLLL]

Hi,
Please set CBR + virtual buffer size for a try. Here is an example for reference:
Random blockiness in the picture RTSP server-client -Jetson TX2 - #5 by DaneLLL