4 appendix d: hints for minimizing bitrates, On the encoder menu – QVidium QVSD User Manual
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User‟s Manual v.3
QVidium
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QVSD H.264 SD Video
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12.4 Appendix D: Hints for Minimizing Bitrates
Audio Notes
To minimize wasted audio overhead and minimize audio bitrates, you should set one of
the following:
1. Set the Audio Bitrate to 56 Kbps and the Sample Rate to 48 KHz. Encoding MUST
be AAC (results in 63 Kbps); or
2. Set the Audio Bitrate to 64 Kbps and the Sample Rate to 32 KHz. Any audio
encoding (results in 84 Kbps)
At low bitrates, we have found that MPEG1/Layer2 Audio Encoding sounds best.
(Note: setting MPEG1/Layer2 to 56 Kbps results in a total of 126 Kbps audio overhead.)
Low-Bitrate Encoder Settings
On the Encoder menu:
1. Click on "Default" to reset the Encoder Profile.
2. Then set the following:
On basic tab:
On Advanced tab:
Video Bit Rate: 200000
Low Delay: Yes
Video Encoding: H264
Video Filtering: On
Audio Bit Rate: 64000
Video Frame Rate: Half
Audio Encoding: MPEG1/Layer2
Video Resolution: CIF
Audio Sampling Rate: 32000