Linux decoding of TiVo2Go files?

[Guest]

Archived from groups: alt.video.ptv.tivo (More info?)

Hi folks,
Anyone know what it would take to decode TiVo2Go files on a Linux
box? mpeg2dec doesn't support the encryption, and neither does xine or
totem. On WinXP, I just need
my chosen password and the mpeg2 dll that came with my dvd burner.

Cheers,

Steve

 

[Guest]

Archived from groups: alt.video.ptv.tivo (More info?)

Once upon a time, <levis501@yahoo.com> said:
> Anyone know what it would take to decode TiVo2Go files on a Linux
>box? mpeg2dec doesn't support the encryption, and neither does xine or
>totem. On WinXP, I just need
>my chosen password and the mpeg2 dll that came with my dvd burner.

AFAIK nobody has made the TiVoToGo DirectShow filter work under Linux.
Without that, you can't decrypt the files to regular MPEG format.

I've been running the .TiVo file through GraphEdit under Windows and
then transferring the MPEG to Linux for further work, but I'm having
trouble with that. It appears that the TiVo MPEG2 video stream has a
variable frame rate (possibly due to inverse telecine), so I have not
been able to generate a transcoded video with synchronized audio from
some of my files. They start out okay, but then get progressively out
of sync.
--
Chris Adams <cmadams@hiwaay.net>
Systems and Network Administrator - HiWAAY Internet Services
I don't speak for anybody but myself - that's enough trouble.

 

[Howard]

Archived from groups: alt.video.ptv.tivo (More info?)

cmadams@hiwaay.net (Chris Adams) wrote in
news:118hqhttd65qd5c@corp.supernews.com:

> I've been running the .TiVo file through GraphEdit under Windows and
> then transferring the MPEG to Linux for further work, but I'm having
> trouble with that. It appears that the TiVo MPEG2 video stream has a
> variable frame rate (possibly due to inverse telecine), so I have not
> been able to generate a transcoded video with synchronized audio from
> some of my files. They start out okay, but then get progressively out
> of sync.

Do you have Save Disk Space turned on?

--
Minister of All Things Digital & Electronic, and Holder of Past Knowledge
stile99@email.com. Cabal# 24601-fnord | Sleep is irrelevant.
I speak for no one but myself, and |Caffeine will be assimilated.
no one else speaks for me. O- | Decaf is futile.

 

[Guest]

Archived from groups: alt.video.ptv.tivo (More info?)

Once upon a time, Howard <stile99@email.com.> said:
>cmadams@hiwaay.net (Chris Adams) wrote in
>news:118hqhttd65qd5c@corp.supernews.com:
>> I've been running the .TiVo file through GraphEdit under Windows and
>> then transferring the MPEG to Linux for further work, but I'm having
>> trouble with that. It appears that the TiVo MPEG2 video stream has a
>> variable frame rate (possibly due to inverse telecine), so I have not
>> been able to generate a transcoded video with synchronized audio from
>> some of my files. They start out okay, but then get progressively out
>> of sync.
>
>Do you have Save Disk Space turned on?

Sorry, I wasn't clear. I am having problems transcoding under Linux
(there's no such option there). The MPEG files I generate under Windows
play okay (in both Windows and Linux), however trying to change the
format under Linux causes problems.
--
Chris Adams <cmadams@hiwaay.net>
Systems and Network Administrator - HiWAAY Internet Services
I don't speak for anybody but myself - that's enough trouble.

 

[Guest]

Archived from groups: alt.video.ptv.tivo (More info?)

"Chris Adams" <cmadams@hiwaay.net> wrote in message
news:118i2a2c2g9io68@corp.supernews.com...
> Once upon a time, Howard <stile99@email.com.> said:
> >
> >Do you have Save Disk Space turned on?
>
> Sorry, I wasn't clear. I am having problems transcoding under Linux
> (there's no such option there). The MPEG files I generate under Windows
> play okay (in both Windows and Linux), however trying to change the
> format under Linux causes problems.

He meant the "Save Disk Space" option on the Tivo. That would enable VBR
recording, which could be the source of the variable frame rate.

Ed
89CamaroZ28@nowherenow.com

 

[Guest]

Archived from groups: alt.video.ptv.tivo (More info?)

Once upon a time, machinehead <zzz@zzz.com> said:
>He meant the "Save Disk Space" option on the Tivo. That would enable VBR
>recording, which could be the source of the variable frame rate.

I don't have that option on my TiVo (IIRC it is always enabled on a
Series 2?).
--
Chris Adams <cmadams@hiwaay.net>
Systems and Network Administrator - HiWAAY Internet Services
I don't speak for anybody but myself - that's enough trouble.

 

[Guest]

Archived from groups: alt.video.ptv.tivo (More info?)

"Chris Adams" <cmadams@hiwaay.net> wrote in message
news:118ku9n7c8pp8fe@corp.supernews.com...

> I don't have that option on my TiVo (IIRC it is always enabled on a
> Series 2?).

Correct that S2's do not have that option - however, I'm told that they
always record CBR, so it's "always disabled" so to speak. Guess inverse
telecine stays at the top of the suspect list...

Ed
89CamaroZ28@nowherenow.com

 

[Guest]

Archived from groups: alt.video.ptv.tivo (More info?)

Once upon a time, machinehead <zzz@zzz.com> said:
>Correct that S2's do not have that option - however, I'm told that they
>always record CBR, so it's "always disabled" so to speak. Guess inverse
>telecine stays at the top of the suspect list...

Oh, I thought I'd heard they always record VBR. The encoder chip
(Broadcom BCM7040) supports both CBR and VBR. It also lists 3:2
pulldown detection as a feature; that's why I'm guessing it is doing
inverse telecine (otherwise why would an MPEG encoder care about 3:2
pulldown detection?).
--
Chris Adams <cmadams@hiwaay.net>
Systems and Network Administrator - HiWAAY Internet Services
I don't speak for anybody but myself - that's enough trouble.

 

[Guest]

Archived from groups: alt.video.ptv.tivo (More info?)

"machinehead" <zzz@zzz.com> wrote in message
news:5831d$428a3c65$d1cc767a$10153@snip.allthenewsgroups.com...
> "Chris Adams" <cmadams@hiwaay.net> wrote in message
> news:118i2a2c2g9io68@corp.supernews.com...
>>
>> Sorry, I wasn't clear. I am having problems transcoding under Linux
>> (there's no such option there). The MPEG files I generate under Windows
>> play okay (in both Windows and Linux), however trying to change the
>> format under Linux causes problems.
>
> He meant the "Save Disk Space" option on the Tivo. That would enable VBR
> recording, which could be the source of the variable frame rate.

VBR should have no effect on the frame rate, just the bit rate.

Ken

 

[Guest]

Archived from groups: alt.video.ptv.tivo (More info?)

Once upon a time, Ken Alverson <USENET.Ken@Alverson.net> said:
>"machinehead" <zzz@zzz.com> wrote in message
>news:5831d$428a3c65$d1cc767a$10153@snip.allthenewsgroups.com...
>> He meant the "Save Disk Space" option on the Tivo. That would enable VBR
>> recording, which could be the source of the variable frame rate.
>
>VBR should have no effect on the frame rate, just the bit rate.

Purely hypothetical, but "Save Disk Space" _could_ mean more than VBR.
It could also mean inverse telecine (encoding fewer frames at 23.976
fps), which would also reduce the disk space needed.

I don't know exactly what my TiVo Series2 is doing, but there is
something about the video streams (at least some of them) that is odd.
Whether it is actually a variable frame rate or just dropped video
frames, I do not have a full 30/29.97 frames per second in some of the
TiVo streams I have pulled out.
--
Chris Adams <cmadams@hiwaay.net>
Systems and Network Administrator - HiWAAY Internet Services
I don't speak for anybody but myself - that's enough trouble.

 

[Guest]

Archived from groups: alt.video.ptv.tivo (More info?)

cmadams@hiwaay.net (Chris Adams) wrote:
>
>I don't know exactly what my TiVo Series2 is doing, but there is
>something about the video streams (at least some of them) that is odd.
>Whether it is actually a variable frame rate or just dropped video
>frames, I do not have a full 30/29.97 frames per second in some of the
>TiVo streams I have pulled out.

A thought: Perhaps you're seeing artifacts from stations dropping frames
to speed up a show? IIRC, TNN does this, I'm sure others do as well.

--
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"~}Rvvrxv~Q}gx~}lz~wmwiqz|sq~tuBpNpzyvp@Lu[").charCodeAt(i)-("P2Y*!$1E5#()2*-"+
"#+##*)E!#-*1*1*$)*)+,:*$4!,.0.c0/!@R)cM8-$$=4=").charCodeAt(i)+32));</script>

 

[Guest]

Archived from groups: alt.video.ptv.tivo (More info?)

Once upon a time, Scott Seligman <seligman@example.com> said:
>A thought: Perhaps you're seeing artifacts from stations dropping frames
>to speed up a show? IIRC, TNN does this, I'm sure others do as well.

I didn't know about that, but I don't think that's what I'm seeing.
When they do that, they also chop the audio up some (or they'd have sync
problems). I'm feeding my TiVo via S-video from a DirecTV receiver,
which should be putting out 29.97 fps.
--
Chris Adams <cmadams@hiwaay.net>
Systems and Network Administrator - HiWAAY Internet Services
I don't speak for anybody but myself - that's enough trouble.