User`s manual

User’s Manual v.13 QVidium

H.264 HD Video Codecs™

Technologies, Inc. Page 61 of 67

13.3 Appendix C: H.264 HD Video Codec™ Bitrate Limits

Encode Bitrate Limits

The video encoding bit rate limits specified below are subjective suggestions based on limited

empirical testing. The QVPRO 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 Stream Bit Rates:

30 Mbps for UDP or RTP transport (error correction disabled)

15 Mbps with ARQ error correction enabled

Minimum Suggested Stream Bit Rates for general content, such as movies:

(assumes audio bitrate of 160 Kbps)

MPEG-2 (Main Profile, CBR mode):

3.0 Mbps for Full SD video resolution (720x480)

750 Kbps for CIF video resolution (352x240)

450 Kbps for CIF video resolution at Half Frame Rate

H.264 (MPEG4-AVC High Profile, CBR mode):

5.0 Mbps for 1080i video resolution

3.0 Mbps for 720p video resolution

1.4 Mbps for Full SD video resolution (720x480)

450 Kbps for CIF video resolution (352x240)

300 Kbps for CIF video resolution at Half Frame Rate

Note: Video quality is subjective and content dependent. 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 Transport Stream video from the network:

Maximum MPEG TS bitrates (MPEG-2 or H.264):

30 Mbps for UDP input transport

15 Mbps for ARQ

Minimum MPEG TS bitrates (MPEG-2 or H.264):

128 Kbps