Decoding takes too long

[zklATB]

@kumattau @mholtmanns @n1mmy @aaronp24 @jakepoz Hello, I am running the SampleDemuxDecode.py file and trying to test decoding an rtsp online stream on the LAN on the T4 graphics card. The actual measurement is that a single frame takes about 40ms, of which demux takes up most of the time. Is this normal? Are there any optimization solutions? We want to achieve real-time decoding + deep learning inference, thank you.