How to record via IEEE 1394 (Firewire) to Windows XP - Page 204 - AVS Forum | Home Theater Discussions And Reviews
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post #6091 of 6098 Old 02-23-2017, 12:16 AM
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Huge file size in firewire output from Motorola RNG200

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Originally Posted by dr1394 View Post
Comcast is currently converting HD channels from MPEG-2 to H.264 here in the Bay Area. I've been putting it off, but after the latest round of channel conversions, I had to replace my DCH-3200 with an RNG110.

The IEEE1394 port on the RNG110 is enabled, but it's operation is not correct. PAT and PMT is missing and there's a huge amount of stuffing packets on PID 0x1fff. No D-VHS box of any kind can ever work with an RNG110.

However, the video and audio streams are present. With some software trickery, I was able to capture a workable Transport Stream for both MPEG-2 and H.264 channels.

Ron
If anyone knows what's going on with my RNG200 DVR from Comcast, it might be you, Ron. I have an old DCX-3401 that I sometimes record stuff to my PC via the firewire port. I also do the same with my newer Comcast box --- an RNG200 (aka DCX-3501). So they are both Motorola critters. Now that most of the channels have been switched to H.264, I have noticed a huge difference in the file sizes when I record H.264 content from the RNG200, versus the DCX-3401.

For example, if I record a 2-hour movie from the Hallmark channel for my stepdaughter, using the DCX-3401, the file is a little over 3GB in size. If I record the same movie, same channel, using the RNG200 (DCX-3501), the file size is over 20GB!!! Usually about 23GB, actually. Both files are quite playable with the VLC Player app.

Ron, you say you have an RNG110 and you noticed "a huge amount of stuffing packets on PID 0x1fff" in the stream you captured to a PC. I am not sophisticated enough to look inside packets (although I do have an IT background), but do you think that what you observed might be what's going on with my gargantuan file sizes from the RNG200?

Larry
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post #6092 of 6098 Old 02-23-2017, 12:45 AM
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It's very likely that it's stuffing packets. An easy test would be to try and compress the large files with PKZIP, 7-Zip or whatever you use.

In general, trying to compress MPEG-2 Transport Streams usually doesn't get you anywhere (since the video and audio is already compressed). But since stuffing packets are almost all 1's, they will compress very well. So the 23 GB files should end up around 3 GB just like you're seeing from the DCX-3401.

Ron

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post #6093 of 6098 Old 02-23-2017, 10:41 PM
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Another easy test to see what's in the file would be to run it through (free) TSReader Lite, which would directly show how many of each type of packet it contains. The non-free, non-Lite version could create a new file with proper PAT and no null ("stuffing") packets. There are other freeware tools for null-packet stripping also.
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post #6094 of 6098 Old 04-04-2017, 06:35 AM
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The amount of packing on the RNG 200 boxes is absurd. Having been a MOTO capture guy for over a decade, I am thrilled I can still capture. However, I just captured a 30 minute program that is still an MPEG2 stream. Ran it through VideoRedo with no edits and left it same format:

Capture: 6.19 GB
VRD TS: 2.06 GB

That's a lot of wasted disc space.

The picture after the MP4 switchover is soft with more blocking than before. Really a disappointment for the hassle they made us go through.
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post #6095 of 6098 Old 07-06-2017, 11:18 AM
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I still do some firewire recording from a Comcast Moto RNG150N but am looking to switch to FIOS. The box they''d be supplying is a CHS 335HDC which I see it has a firewire port. Anyone know if it's active?
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post #6096 of 6098 Old 07-08-2017, 10:05 AM
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Quote:
Originally Posted by etete View Post
I still do some firewire recording from a Comcast Moto RNG150N but am looking to switch to FIOS. The box they''d be supplying is a CHS 335HDC which I see it has a firewire port. Anyone know if it's active?
I fully expect that it is active. I also fully expect that the firmware is garbage, rendering it basically unusable. But hopefully I'm wrong on that last one.
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post #6097 of 6098 Old 07-08-2017, 10:16 AM
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Just like gummy bear packs get smaller and smaller in time to keep the price constant, same applies to all what cable companies are doing, shoving more and more programming w/commercials into same bandwidth, which obviously reduces product quality.

Trouble is I can always get two bags of gummy bears when I feel like it. Can't do better quality with cable though.

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post #6098 of 6098 Old 07-08-2017, 05:59 PM
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Appreciate the reply!

The more I think about it Firewire capture is is beginning to be less of a deal killer (but it can at least let me feel even better about it).

Yes, Comcast has really been cutting corners lately -- Most egregious is their switch to 720p for nearly every HD station, only the locals remain 1080i. They've only recently started to attach no-copy flags to the gratis premium channels (IFC. MGM, Encore) but, mostly, downsizing of nearly all HD lessens my capture/archive enthusiasm. With FIOS offering identical service for $52 (25%) less a month I'm hoping their 1 month trial period is boom, not bust. The only truly mitigating factor is I have an elderly mother using the service and I hate to make any changes to her "comfort zone".
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