Image Processing Reference
In-Depth Information
What Are the Best Bit Rates to Aim For?
For broadband, choose 350-500 Kbps and for modem, 28-56 Kbaud should support a pay-
load of 20 to 40 Kbps. Mobile phones are capable of 64 Kbps. Table A-1 summarizes typi-
cal bit rates across a variety of different transport types:
A-1 Bit Rates for Different Transport Types
Bit rate
350-500 Kbps
28-56 Kbaud
Broadcast TV
3-5 Mbps
SDTV video with MPEG-2
4.5 Mbps
SDTV video with H.264
2 Mbps
HDTV video with H.264
5-6 Mbps
Uncompressed SDTV video
25 Mbps
Edit-quality DV video
25-50 Mbps
What Are the Best Formats for Different Devices?
Table A-2 lists a selection of settings that are appropriate for some standard ways that the
encoded output must be deployed.
A-2 Example Compression Settings
Low bit-rate mobile format
64 Kbps, QCIF or smaller image,
and 15 fps frame rate.
PDA format
160 pixels, 65K colors, and compressed
using Kinoma.
Streaming format
240, 18 fps, and compressed with Real,
Windows Media, or H.264.
Modem-quality video
56 Kbps, low frame rate, small picture size,
mono audio sampled at 22 KHz.
Broadband video
Whatever you can squeeze in at 500 Kbps.
With H.264, this could be near TV sized.
Broadcast format
579 or 480, coded with MPEG-2 at
4 Mbps or H.264 at 2 Mbps.
Store and forward format
TV resolution, full frame rate, high-quality
H.264 at 3 Mbps.
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