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ReplayTV 4000 Series

For MPEG-2 usage with the 5000 series, visit the ReplayTV5KMPEG-2Usage section.

Quick Reference

QualitySetting Resolution Video Bitrate Audio Bitrate
High 720x480 (D1) 6Mbps VBR 128 or 224 kbps
Medium 720x480 (D1) 4Mbps VBR 128 or 224 kbps
Standard/Extended 352x480 (HHR) 2MBps VBR 128 or 224 kbps

Although the streams are all VBR (Variable Bitrate) the MPEG header shows a constant or nominal bitrate. It should also be noted that High can peak at 12Mbps which is incompatible with DVD specifications which max at 9.7Mbps.

Technical Profile

Parameter Setting
System Stream Type Program
Video Standard NTSC
Video Compression MPEG-2
Video Bitrates (see above)
Resolution (see above)
Frame Rate 29.97 fps
Drop Frame Flag Not Set
Constrained No
IQ Matrix False
Non-IQ Matrix False
Aspect Ratio (Standard) 4:3 (640x480)
Aspect Ratio (High/Medium) 4:3 (720x540)
Sequence Format Interlaced
Field Order A (top first)
Chroma Format 4:2:0
Profile/Level MP@ML
Color Primaries ITU-R BT.470-2 System B, G
Transfer ITU-R BT.470-2 System B, G
Matrix FCC
Quantizer Scanning Pattern zigzag
Quantizer Scale 1
Intra DC Precision 8
Intra VLC Format 1
Audio Compression MPEG-1 Layer 2
Audio Stream Stereo, 48kHz
Audio Bitrates (see above)
Frame Length 24.0 ms (384 bytes if 128kbps or 672 bytes if 224kbps)
VBV Buffer 112 / 224
VBV Delay 65535
Minimum Buffer Size 229376 bytes

MUX Rates

All measurements are bits per second

QualitySetting System Video Audio
Standard 1948000 1820000 128000 or 224000
Medium 4224000 4000000 128000 or 224000
High 6224000 6000000 128000 or 224000

Notes and Issues

System Stream

Video Stream

Video Stream Packet Length usually around 2054 bytes.

Audio Stream

It is not yet known what causes the audio bitrate to be 128 on some recordings and 224 on others.

-- LeeThompson - 20 Apr 2002

I know that a number of people have looked at playing back non-Replay generated MPEG files (after generating a ndx file using your utility) with little/no success. Do you guys have any notes on what has been tried, what results have been seen, and any theories you have on why it doesn't work? It seems like a fun problem to look into...

Is there any reason to believe that, once it is determined why non-Replay generated MPEGs don't play back, we couldn't write a utility to do a transform to make an MPEG compliant? Do you think the problem is in the MPEG format itself, perhaps requiring a complete re-encoding with a encoder that emits something Replay's MPEG chip will accept (ugh), or do you think that some unused area in the MPEG format is being used to store checksum/CRC data either by the encoder chip or by the Replay itself?


-- JoeToomey - 10 Jan 2003

Your post will appear before this form in chronological order (newest at bottom)

Topic ReplayTVMPEG-2Usage . { Edit | Attach | Ref-By | Printable | Diffs | r1.14 | > | r1.13 | > | r1.12 | More }
Revision r1.14 - 01 Apr 2003 - 04:22 GMT - TWikiGuest
Parents: GuideSnapshot > ReplayShow > GOP > MPEG-2
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