Transfer Rate Vs PS3

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Transfer Rate Vs PS3

Postby Dan » Wed Feb 04, 2009 3:22 am

Hi,

I noticed that when streaming a Xvid file that the transfer rate is through the roof, but the PS3 reports a more accurate rate. For example I have this file:

Code: Select all
Format                           : AVI
Format/Info                      : Audio Video Interleave
File size                        : 80.1 MiB
Duration                         : 4mn 4s
Overall bit rate                 : 2,749 Kbps
Writing application              : VirtualDubMod 1.5.10.2 (build 2540/release)
Writing library                  : VirtualDubMod build 2540/release

Video
Format                           : MPEG-4 Visual
Format profile                   : Simple@L3
Format settings, BVOP            : No
Format settings, QPel            : No
Format settings, GMC             : No warppoints
Format settings, Matrix          : Default
Codec ID                         : XVID
Codec ID/Hint                    : XviD
Duration                         : 4mn 4s
Bit rate                         : 2,515 Kbps
Width                            : 688 pixels
Height                           : 416 pixels
Display aspect ratio             : 1.654
Frame rate                       : 25.000 fps
Resolution                       : 24 bits
Colorimetry                      : 4:2:0
Scan type                        : Progressive
Bits/(Pixel*Frame)               : 0.351
Stream size                      : 73.2 MiB (91%)
Writing library                  : XviD 1.1.2 (UTC 2006-11-01)

Audio
Format                           : MPEG Audio
Format version                   : Version 1
Format profile                   : Layer 3
Codec ID                         : 55
Codec ID/Hint                    : MP3
Duration                         : 4mn 4s
Bit rate mode                    : Constant
Bit rate                         : 224 Kbps
Channel(s)                       : 2 channels
Sampling rate                    : 44.1 KHz
Resolution                       : 16 bits
Stream size                      : 6.52 MiB (8%)
Alignment                        : Split accross interleaves
Interleave, duration             : 40 ms (1.00 video frame)
Interleave, preload duration     : 500 ms


Yet, to stream this file with an overall bitrate of 2,749 Kbps (2.75 Mbps), without any transcoding, requires a 60 Mbps transfer rate. This doesn't make sense to me. The PS3's "Display" reports a more reasonable average bitrate of around 2.9 Mbps. But Task Manager (WinXP SP2) shows it's going off the chart (60 percent of the 100 Mbps link speed). DU Meter affirms the 60 Mbps transfer rate.

If I'm remembering correctly, this is one of the many Xvid shared files I use to stream from one computer to another in order to watch it, and while using the same router no where did the transfer rate go much above the overall bitrate of the file.

Does anyone know why a considerable amount of overhead (greater than 20 times) is required to stream it to a PS3?

Thanks.
When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car.
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Re: Transfer Rate Vs PS3

Postby shagrath » Wed Feb 04, 2009 9:23 am

ps3's AVI playback is broken... it asks every xvid file in 1Mb piece, with a lot of overhead (but 60mbps seems weird, though)
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Re: Transfer Rate Vs PS3

Postby Dan » Tue Feb 10, 2009 9:37 pm

Yep, seems weird to me, too. I wasn't sure why playback would occasionally stall, so instead of wireless I connected the PS3 with a CAT5 cable directly to the router and was amazed to see peaks in Task Manager up to 60 Mbps during playback. In once sense I'm relieved to know that high transfer rates for Xvid files are to be somewhat expected.

Thanks for the reply
When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car.
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Posts: 110
Joined: Sun Feb 01, 2009 11:22 pm


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