Tivo Decrypt

bd51520

New member
Hello. I am wondering if you can steer me in the right direction. I'm afraid, as a user, I am just not proficient enough in the arena of editing to understand what the problem could be.

I use KMTTG to take my programs from the Tivo to put on a hard drive, which I use to play them on a media player in another room. Just recently, I've noticed that as I watch the program, periodically thought the program, it will appear to freeze for about 5-8 seconds and then continue. In retracing my steps, I noticed that when I use Videoredo (Suite version 3.20) to decrypt the file to save it as an .mpg, the file size of the output increases from 6.887 gb to 6.962 gb. In comparison, I ran the same .tivo file through Tivodecode, and it outputted the file at the same size as the source original.

Also, when I view the VRD output's file's Win7 properties, it shows the length of the program to be 1:02:31. When I open the output file again in VRD, it shows the length of the program to be 0:59:59 (just like in the source), which is the length of the program on the tivo itself, as well as the output of the Tivodecode'd file's properties.

Obviously, the differences here explain the behavior of my media players in terms of how they are handling this. In addition to freezing (which overall adds up to about two minutes), it just bombs out between 1:00:00 and 1:02.31 because there's no "data" left to show at that point. (I am actually at 58 minutes into the broadcast, but the player thinks it's at 1 hour.) So, this sort of makes sense, intuitively. :mad:

I am on the current version of Tivo Desktop and have been for about a year.

What I don't understand is why this problem is intermittent. The show I am recording is "Person of Interest". The show I recorded on 2/23 has the problem; the one I recorded on 1/12 did not. All I can see is that the bit rate of the Feb program is much lower than the January program. I am not sure why that would matter, but that appears to be the only difference that I can understand as significant in the VRD logs for both decryptions. (log files are attached for both)

I have such a superficial understanding of the nature of digital video, so I was wondering if anyone could provide thoughts/suggestions/understanding of this issue. I can certainly change KMTTG to use Tivodecode instead of VRD for decrypting; I just wanted to further learn about what the thoughts are about what could be going on with the VRD or directshow filter, if anything.

Thanks so very much for any responses....and your indulgence! :confused:
 

Attachments

dlflannery

Moderator
Is your TiVo a Premiere or Elite model? If so, are you selecting the "fast transfer" option (whatever it's called -- I don't have those models) in TiVo Desktop? If so, change it -- that could be causing problems. Of course, you mention both kmttg and TiVo desktop, so I'm not sure which program you're using to transfer files, or are you using both?

Some obvious issues based on your log file attachment:
1. How can the file sizes (and thus bit rates) be so different for two one-hour episodes of the same series show? Was one transferred with kmttg and the other with TiVo Desktop (and see first paragraph)?

2. VRD's analysis of one file shows a Duration of 0. (???)

3. The QSF flag is set only for one of the files -- the one that did not have an issue. Did you do Save As for one file and QSF for the other? Since QSF does more clean up on the file, it would not be surprising for the output size to be different, and for the resulting file to play better in your media players.

BTW, what is the "media player in another room" ?
 

Dan203

Senior Developer
Staff member
Are you actually editing the program? Or just running it through Quick Stream Fix to convert to .mpg?

There are a couple of issues I know of that can cause weird behavior like this. Recently I have seen files, sent to me by customers, where the commercials in the program either have a different frame rate then the main video or where the audio has a different sampling rate. VideoReDo does not handle either of these well. However if you edit out the parts where this occurs you should be able to skip over these odd parts and fix the problem. However you have to do this before you ever run the file through anything else. You have to edit the .tivo file directly.

Edit: One more thing to be aware of. If your cable company is doing this then you have to watch out for programs that start off with one of these odd commercials. VideoReDo gleans all the information it uses for the whole output process from the first frame in the file. So if it doesn't match the body of the program you wont be able to process the file correctly with VideoReDo even if you edit it out. The only way around this would be to use the Trim & Copy tool to try and cut the bad commercial from the start of the file so that the first frame matches the main program

Dan
 
Last edited:

bd51520

New member
Hi Dan. I really appreciate your taking the time to respond with such detail. I have been out of town for work, so I've not had a lot of time to get back to this. I think your comments are on the right path. I switched from using videoredo to tivodecode to get the files off the tivo, and that didn't matter. What I do notice is that it only occurs on the CBS programs; not the NBC, PBS, or TVLand programs I record. Each of the CBS programs commence with a network commercial advertising another CBS program that you should watch.

I'll start playing around with it to see what I can understand. I may not fix it, but at least I will have learned something. The other strange thing is that my media player, which is a Sage TV HD200 loses its mind over this, but when I play the exact same video in Windows Media Player, it doesn't seem to mind.

I'll report back what I do or do not figure out. Thanks again for the clues.

bd
 

bd51520

New member
Hi Dan. I really appreciate your taking the time to respond with such detail. I have been out of town for work, so I've not had a lot of time to get back to this. I think your comments are on the right path. I switched from using videoredo to tivodecode to get the files off the tivo, and that didn't matter. What I do notice is that it only occurs on the CBS programs; not the NBC, PBS, or TVLand programs I record. Each of the CBS programs commence with a network commercial advertising another CBS program that you should watch.

I'll start playing around with it to see what I can understand. I may not fix it, but at least I will have learned something. The other strange thing is that my media player, which is a Sage TV HD200 loses its mind over this, but when I play the exact same video in Windows Media Player, it doesn't seem to mind.

I'll report back what I do or do not figure out. Thanks again for the clues.

bd
 
Top Bottom