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I'm generating a multicast stream with this command:

ffmpeg -hwaccel_device 1 -format_code Hi50 -re -f decklink -i 'DeckLink Duo (1)' -pix_fmt yuv420p -c:v h264_nvenc -profile:v high -b:v 3500k -rc 2 -cbr true -maxrate 3500k -bufsize 7000k -c:a mp2 -b:a 192k -f mpegts "udp://239.1.1.2:5000?ttl=2&pkt_size=1316"

My problem is that if I open this stream on a device with a 100Mb/s connection, it's heavily pixelated. The same stream on a 1Gb/s device displays fine.

I have other multicast streams from our ISP and they display fine regardless of connection speed.

Has someone come across this issue? This seems ffmpeg related.

I tried several settings, bitrates, etc. Also playing on VLC, OBS. Same result.

Version:

ffmpeg version N-111519-gefa6cec759

Thanks in advance.

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  • Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking.
    – Community Bot
    Commented Jun 9 at 17:04

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