QVidium QVSD - Manual (Page 48)

User‟s Manual v.3 QVidium
®
QVSD H.264 SD Video Codec™
Copyright 2011 QVidium
®
Technologies, Inc.Page 48 of 53
12.3 Appendix C: H.264 SD Video Codec
™ Bitrate Limits
Encode Bitrate Limits
The video encoding bit rate limits specified below are subjective suggestions based on
limited empirical testing. The QVSD codec will allow you to enter any video encoding
bitrate and will attempt to produce the best video quality it can, based on the video bit rate
you set as an upper limit on the average peak bitrate. (Unless noted otherwise, all bitrates
below assume full NTSC (29.97 fps) or PAL frame rates (25 fps).)
Therefore, the values here are only provided as a general guideline to help with estimating
the expected network loading:
Maximum Video Encoding Bit Rates:
25 Mbps for UDP or RTP transport (error correction disabled)
15 Mbps with ARQ error correction enabled
Minimum Suggested Bit Rates for general content, such as movies:
MPEG-2 (Main Profile):
2.0 Mbps for Full video resolution (720x480)
500 Kbps for CIF video resolution (352x240)
250 Kbps for CIF video resolution at Half Frame Rate
H.264 (MPEG4-AVC High Profile):
4.8 Mbps for 1080i video resolution
2.4 Mbps for 720p video resolution
1.0 Mbps for Full SD video resolution (720x480)
250 Kbps for CIF video resolution (352x240)
125 Kbps for CIF video resolution at Half Frame Rate
Note: Video quality is content dependent and the minimum bitrates suggested above may
not produce acceptable video for any given application. As a general rule we
suggest that you use H.264 encoding for best video quality, and adjust the bitrate
based on your own observations to suit your needs.
Decode Bitrate Limits
Bitrate limits related to receiving MPEG-2 Transport Stream video from the network:
Maximum MPEG-2 TS bitrates (MPEG-2 or H.264):
15 Mbps for UDP and RTP input transport
4.5 Mbps for ARQ
Minimum MPEG-2 TS bitrates (MPEG-2 or H.264):
1 Mbps (Lower input bitrates can produce decoder instability.)