Problems w/corrupted downloads in kmttg/Tivo Desktop

Discussion in 'TiVo Home Media Features & TiVoToGo' started by cubdukat, Oct 25, 2016.

  1. moyekj

    moyekj Well-Known Member

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    Mission...

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    In config--VideoRedo enable option to decrypt using VideoRedo.
     
  2. lpwcomp

    lpwcomp Well-Known Member

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    John's...
    I don't believe there is any way for that qsfix to run on an encrypted file.

    VRD uses its qsfix to decrypt so no reason to run it separately.
     
  3. ***mike212***

    ***mike212*** New Member

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    Thank you, I understand now, I was using VRD's QS Fix tool on the .Tivo file and then using kmttg to decrypt the new .Tivo file. Your saying if you use VRD to decrypt the .Tivo file it automatically runs the QS Fix tool before the actual decrypt. Thanks
     
  4. lpwcomp

    lpwcomp Well-Known Member

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    John's...
    You misunderstand. It's not running qsfix then decrypting. It's decrypting on the fly as it reads the file using the TiVo DirectShow filter, which is why you need at least a partial install of TiVo Desktop.
     
  5. ***mike212***

    ***mike212*** New Member

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    Thanks
     
  6. Dan203

    Dan203 Super Moderator Staff Member TCF Club

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    Yeah even though the resulting file is a .tivo it's still decrypted. The only part that remains encrypted after running it through QSF is the header where the metadata is stored. The actual video data is decrypted.
     
  7. lpwcomp

    lpwcomp Well-Known Member

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    John's...
    o_O What I get is a .ts file with no metadata. I download in transport stream format and get a (presumably)encrypted .tivo file. Then qsfix runs against that file. Are you talking about what happens if you combine download & decrypt?
     
  8. moyekj

    moyekj Well-Known Member

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    There's an option in VideoRedo itself to "save as" where you have option to save as a .TiVo file. In that case you get what Dan describes - unencrypted video with header metadata.
     
  9. ssobol

    ssobol New Member

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    All my recordings made since I changed my Series 2 HD to Tivo Bolt have at least one section of dropouts/corruption after transferring to PC. I watch most shows from my Tivo on a laptop after conversion through VideoReDo because I travel a lot for work. The Series 2 HD recordings did not present any problems. When running VRD Quickfix it is not uncommon to see 2-3K frames removed. If a file contains a corruption and I try to use VRD to cut it, VRD will usually crash when transcoding the output file.

    My Series 2 HD worked better than my Bolt does.
     
  10. Dan203

    Dan203 Super Moderator Staff Member TCF Club

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    2-3K frames? That's too many. There are usually only 30-60 frames per second of video. So that means you're losing over a minute of content. Does the recording have an error when played on the TiVo or only when transferred to a PC?
     
  11. lpwcomp

    lpwcomp Well-Known Member

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    John's...
    2 things.

    1. I've seen 30-40 seconds variance in the duration of multiple downloads of the same recording after qsfix.

    2. There's no such thing as a "Series 2 HD". It's either a Series 3 or it's not HD . And neither one supports TS downloads.
     
    dlfl and kpeters59 like this.
  12. SlimTrigger

    SlimTrigger New Member

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    If you go back a bit in this thread to the posts in February 2017, I believe Dan203 enlightened us on a very important point - that the TiVo does not store files in TiVo format, and when you download files to a PC using any of the various front-ends (TiVo desktop, kmmtg and Archivo, to name three), it is still the TiVo unit that does the initial recode from its internal format to a .tivo file. When the source program was in TS format, there were always some corrupted frames in the initial recode.
    We were able to get better results (less corruption in the file) by making multiple attempts at downloading from the TiVo, trying different front-ends, and choosing the best recode format (for me it was from a .tivo file to a H.264 m2ts file.
    In the past three months or so, the results I have been able to obtain have deteriorated, and the deterioration is very consistent. I don't know if this condition is because of a change in the source program (delivered by Comcast), or because TiVo has changef something in its software which makes for more errors in the initial recode to a .tivo file. The deterioration is now consistent across all the permutations I try, and multiple attempts at downloading the same program now give identical results in terms of number of corrupted frames.
    Prior to this deterioration (and again, this is when source program is in TS format), in a movie with roughly 400,000 frames I would experience roughly 100 to 200 corrupted frames. Now, in a movie with 400,000 frames , I get 700 to 900 corrupted frames.
    No change in any of my equipment or setup, and as before playback directly from TiVo shows no corruption. This is what leads me to believe it's either a change in what Comcast delivers in TS format (and my TiVo unit struggles to recode), or TiVo has changed the internal software which recodes to .tivo format and creates more corrupted frames.
    Anybody else having this newly worse problem and/or have ideas on what might help?
    Thanks to all!
     
  13. cubdukat

    cubdukat Member

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    Sadly this is one of those instances where both TiVo and/or Comcast will point the finger at the other guy and swear it’s their fault, but neither will rectify the problem.

    I’ve been having the same problem with increasing frequency since both our NBC and ABC affiliates in Chicago went to H.264. Now every time I record a show, I have a 50/50 chance it’ll come out completely corrupted and unusable. It’s especially lamentable what happened to NBC because they went from 1080i MPEG-2 with an average bitrate of 12.5 megs to bitrate-starved 720p with an average of 3-3.5 megs, at best. ABC didn’t suffer as much, since they’ve always been bitrate-starved (even OTA).

    I don’t know if it would be possible to implement an TS-compatible variation of the “Resume Downloads” function, but I think it would probably help because I think it has something to do with the delay the Bolt seems to have in tuning in H.264 channels. MPEG-2 is almost instantaneous, but with H.264, I’ve noticed a 2-3 second delay, as if it’s having problems locking on.
     
    Last edited: Jun 20, 2018
  14. Phantom Gremlin

    Phantom Gremlin Active Member

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    I don't have any great insight, just an observation as to the "state of the art". My bottom line is that things are just too complicated.

    Look at H.264: H.264/MPEG-4 AVC - Wikipedia

    Imagine having to implement that. Imagine implementing it in a combination of hardware and software. Now imagine the inevitable bugs in hardware, with software workarounds. With buggy software on top of that.

    Now imagine two different H.264 implementations, viz. cable company encoder and TiVo decoder. What are the odds that they will perfectly interoperate?

    Overlay that with whatever buggy "magic" TiVo does to the bits to turn them into a .tivo TS and it's a wonder that anything works at all.

    Which is a crying shame. High Definition was sold to the public as something which would provide us with wonderful, high quality television. The current reality is the exact opposite of that hype.
     
    leswar likes this.
  15. cubdukat

    cubdukat Member

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    Since I last posted on this thread, I have established two workarounds. I discovered that the file corruption seemed to be with the higher-numbered duplicates Comcast has initiated. I have since corrected my One Passes to record on the lower-numbered channels instead, and in the case of our NBC affiliate, I have also brought out my old ATSC OTA tuner. That way, I can get all of NBC's programming in MPEG-2 and 1080i, the way it was before Comcast screwed everything up. Fortunately, right now only ABC and NBC are downconverted, but it won't be long before CBS and Fox follow suit, and both of them have very high bitrates in MPEG-2.

    I'm also debating whether or not to upgrade to the Bolt Vox, in the hopes that maybe it's the tuners in the first-gen Bolt that are causing the problem. Besides, I've had the Bolt about two or three years; it's just time.
     
  16. ej42137

    ej42137 Well-Known Member

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    I really doubt there have been any significant changes from the Bolt to the Bolt VOX; I'm pretty sure the remote is the only difference.
     
  17. ADent

    ADent Active Member

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    Interesting. I have two Bolts next to each other and the one setup to use the higher channels has a very low success rate using KMTTG lately and has always had more problems.

    My recent work around has been to go back to TiVoDesktop and download using that.

    The TiVo app directly to my iPhone works consistently too.
     
  18. ClearToLand

    ClearToLand Old !*#$% Tinkerer!

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    1. Are the TiVos wired or wireless?
      .
    2. How much free HDD space is available on each TiVo?
      .
    3. MPEG-2 or H.264 channels?
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    4. Transport Stream or Program Stream transfer protocol?
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    5. If using Transport Stream, how are you monitoring TS Sync Errors?
    All of the TiVo-to-PC transfer methods must use the same basic TiVo 'algorithms' so in that regard it doesn't matter which one you use.
    No experience here...
     
  19. rthurlow

    rthurlow Member

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    I just moved, and went from an OTA antenna to Comcast with a CableCARD (after the requisite couple of days to get the card activated properly), both with the same white Bolt. I did a test recording and transferred it in TS format ("TS downloads" checked) via kmttg. OMG - it was so hosed: Windows Media Center played a few seconds of video and a few minutes of audio with a black screen, and nothing for the rest of the 40 minutes. VideoRedo QuickStream Fix could not do anything with it, complaining about an "Audio Ring Buffer Overflow".

    I downloaded the same show with "TS downloads" turned off to get a PS download, and all is well. Since I had used TS to get whole files instead of truncated ones when there were OTA signal dropouts, PS should be fine. I was worried Comcast might copy-protect the world or something, but it looks like I'm good.

    Take care,
    Rob T
     
  20. ClearToLand

    ClearToLand Old !*#$% Tinkerer!

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    I thought Comcast was big on H.264? [Check a few channels in Diagnostics]

    As long as your shows are in MPEG-2 and you don't care about closed captions, PS 'Slow' File Transfers are fine...
     
    Mikeguy likes this.

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