TivoHD & Series3 MRV/TTG/TTCB: FAQ + Discussion

Discussion in 'TiVo Series3 HDTV DVRs' started by bkdtv, Oct 26, 2007.

  1. Nov 4, 2007 #121 of 366
    bkdtv

    bkdtv New Member

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    The Tivo Series3 is based around the Broadcom BCM7038 CPU and MPEG-2 decoder, but it also has a BCM7411 that is not yet used. The BCM7411 is the same MPEG-2/MPEG-4/VC-1 decoder used by the Samsung BD-P1000 and BD-P1200 Blu-ray players. It is also the same chip in the DirecTV HR20 DVR.

    The TivoHD has the newer BCM7401 DVR CPU which integrates the BCM7038 and BCM7411 into a single chip. The BCM7401 is the same chip found in the new DirecTV HR21 DVR.

    The DirecTV HR20 and HR21 DVRs both load a driver with MPEG-4 support, but Tivo only loads a MPEG-2 driver. I suspect Tivo will add MPEG-4 decoding capability to the next major release (maybe 10.x ?) so they can support high-definition downloads from Amazon Unbox (and elsewhere) in MPEG-4 AVC and VC-1 format. Unfortunately for Tivo, the hardware in the Series2 is not -- and never will be -- MPEG-4 capable.
     
  2. Nov 4, 2007 #122 of 366
    holligl

    holligl Member

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    I had the same experience (Transfers OK but no sound) using HDTVtoMPEG2 converter. I had tried VideoReDo and saved as TiVo format but the TiVo would not recognize the file on NPL.
    I have not gotten NonTiVo HD content back to the THD. SD MPEGS are transfering fine with the Basic TTG.
     
  3. Nov 4, 2007 #123 of 366
    Laserfan

    Laserfan Member

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    Thanks for that; I didn't know it had any hardware-decoding for MPEG-4.

    I couldn't find anything that explicitly stated the BCM7411 would decode Xvid/Dvix files...if you or anyone here knows, by all means share.
     
  4. Nov 4, 2007 #124 of 366
    amukhael

    amukhael New Member

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    holligl, let's hope wgw is onto something in regards to his very plausible solution that would require a downsampling of the AC3 audio-feed (it's currently at 1500kbps).

    What say you wgw, or any others that have gotten non-TiVo recorded HD content to play on the Series3?
     
  5. Nov 4, 2007 #125 of 366
    moyekj

    moyekj Well-Known Member

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    I have several HD mpeg2 transport stream recordings from my Fusion HDTV USB tuner that I converted to mpeg2 program stream using HDTV2MPEG2 that play back fine on my S3s. However, some of them exhibit the following problems when played on the Tivos (OK for PC playback):
    - Trick functions won't work
    - Displayed total time not correct
    - Audio/video sync problems
    There are at least 2 recordings that play back perfectly - these are all recordings of ABCs "Lost".
    Also of note that for all of the above I also have downconverted DVD compatible mpeg2 versions (created from the sources above) and all of those play back without issue on my S3s.

    I have used TTG on several HD recordings from my S3s and stripped them of commercials (using Womble Mpeg Video Wizard) and fed them back to my S3s. In every case those recordings play back perfectly. So this seems to confirm that the most reliable HD sources for the Tivos are ones originating from the Tivos themselves which is probably why TivoPony mentioned that's officially all that Tivo supports for now.
     
  6. Nov 4, 2007 #126 of 366
    HDTiVo

    HDTiVo Not so Senior Member

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    The big question in my mind is what formats the hi def TiVoes are capable of supporting on the box - can they be made to play protected WMVs, etc.? Then after that comes what will TiVo actually implement with software updates?
     
  7. Nov 4, 2007 #127 of 366
    amukhael

    amukhael New Member

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    Likewise, I am able to stream any DVD-quality MPEG-2 file over to the S3. I am now scouring Doom9 for solutions to maybe demux the original .ts source file so that I can downsample the AC-3 audio stream and then re-mux it back to make a playable .mpg for the S3. Looking for any recommendations from the forum :)
     
  8. Nov 4, 2007 #128 of 366
    johnnylundy

    johnnylundy New Member

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    Using the web interface on my TiVo HD through a NetGear 11g router and the TiVo USB adapter, I am only getting 545 KB/sec transfer. This is better than the 350+KB/sec I used to get with my Series 2, but nowhere near the MB/sec you guys are speaking of.

    Is the TiVo-branded USB wireless adapter limiting here? I suppose I could hook up ethernet to my laptop and see...
     
  9. Nov 4, 2007 #129 of 366
    cogx

    cogx Member

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    I've spent way, way too many hours with FFMPEG in the last week or so, trying to figure out exactly how to get my S3 to playback converted-to MPEG2 videos and it is really hard to keep quality and yet not have the S3 freak out (skip bits and/or FFW past parts) when presumably there are spikes in bitrate. Also, VideoRedo didn't do anything at all to let me watch a converted HD capture from my PC to my S3, the same thing, it just seems the S3 can't handle spikes in bitrate at all.

    I've found that all I can do is to really lower the entire quality of the video, so that the S3 can handle playing back the entire video, because nothing I do with the -b -maxrate and -bt settings has been able to work on my entire test suite of videos.

    I think the key is if the video was originally encoded in MPEG2 with a modest bitrate (like a DVD), then it is fine, but HD MPEG-2 videos from capture cards and also transcoding from MPEG-4 to MPEG-2 has really been "flaky" in my experiments. The bottom line is, I can get it to work, if I really butcher the quality, but that defeats the purpose of having a sort of universal media player (like say the TViX 5110 PVR?)

    Oh well, I really don't *need* to have the TTCB feature, it was just something I wanted to see what it was capable of in case I did want to rely on it, but I now see it can't be relied upon, but is more of a "bonus feature" perhaps.
     
  10. Nov 4, 2007 #130 of 366
    Laserfan

    Laserfan Member

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    Ouch; as cogx just said VideoReDo must mangle the mpg somehow that Womble does not--I have yet to get an edited HD show back onto my S3 w/o problems. :(
     
  11. Nov 4, 2007 #131 of 366
    moyekj

    moyekj Well-Known Member

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    I think cogx was referring to HD captures on his PC edited with VideoRedo. I thought others posted success with VideoRedo for editing HD recordings originating from Tivos? The flow I use that has worked perfectly:
    - TTG to PC (Windows XP SP2, Tivo Desktop 2.50)
    - Direct Show Dump Utility to convert .TiVo to .mpg
    - Edit with Womble to cut out commercials
    - Save to .mpg (which only transcodes at the cut points)

    Are you editing .TiVo files directly with VideoRedo? If so, perhaps try converting to .mpg first using Direct Show Dump Utility and then run them through VideoRedo to see if it's any better.
     
  12. Nov 4, 2007 #132 of 366
    bkdtv

    bkdtv New Member

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    Wireless throughput is limited by the quality of your signal. Wireless conditions in every home are different, but some wireless routers do better with weaker signals than others.

    That said, remember that throughput differs significantly depending on what you are doing on the Tivo. If both of your tuners are set to high-bitrate HD channels like CBS-HD and Hdnet, throughput will be significantly less than if those tuners are set to SD channels like SciFi and CNN.
     
  13. Nov 4, 2007 #133 of 366
    Laserfan

    Laserfan Member

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    Excellent idea, I will try it, thanks! :)
     
  14. Nov 4, 2007 #134 of 366
    greg_burns

    greg_burns Now in HD

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    Slower...
    I have had success doing doing that. No need for DirectShow Dump (or TivoDecode) here.
     
  15. Nov 4, 2007 #135 of 366
    holligl

    holligl Member

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    Dec 28, 2004
    I have A Fusion RT5 Gold and have now transfered a Transport Stream file back to the THD using VideoReDo and TCCB.

    1) open the .TP file in VideoReDo, Run Commercial Scan if desired.
    2) Save as Mpeg file in the TiVo Recordings folder, but under options change the Audio format to mpeg (I used a 192KBit rate).

    I did this with a fairly short file, to prove it out, the transfer was a little slow, but seemed to hold the quality and no synch problems. It seems the MPEG Spec on the audio is the key. My previous attempts lost the audio.
     
  16. Nov 5, 2007 #136 of 366
    Laserfan

    Laserfan Member

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    Don't want to do that holligl--I wouldn't want to lose the wonderful opening (all surround channels) drums from Santana's "Evil Ways" in the outstanding episode "Brotherhood" of Cane!!!! Wow! :up:
     
  17. Nov 5, 2007 #137 of 366
    cogx

    cogx Member

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    I'm not even worrying about cutting out commercials, I don't even care about doing that. My issue is that although I can already get my HDTV captures into the S3 just fine, and it will play them, it won't play them all the way through without skipping every so often; usually it will skip within the first 30 seconds, so I know soon enough that yet another transfer isn't going to be really be watchable. I find it odd that the S3 can record HDTV perfectly itself, but is unable to perfectly play back the recordings from the same exact channels I record with my Fusion5Gold PCI card. There is a maximum bitrate for HDTV recordings, so I don't understand why it can't handle those video files without skipping.
     
  18. Nov 5, 2007 #138 of 366
    kas25

    kas25 Member

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    I've successfully moved MP4 home movies to my Series 3. When I go to play them, I have the audio drop issue. If I move the input on my tuner to another input and then back to the correct input, the sound comes on. Is this a known bug?
     
  19. Nov 5, 2007 #139 of 366
    flyerman

    flyerman New Member

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    Douglaston, NY
    Tried TTCB with a recorded file from my Nexus-S card. The format of 1280x720 59.94 fps 16/9 aspect 13.480 Mbps. The audio was AC3 but I tried to save as 192 mpg in Videoredo and I had no success. Does anyone have any suggestions?
     
  20. Nov 5, 2007 #140 of 366
    HDTiVo

    HDTiVo Not so Senior Member

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    Did you use 48KHz?
     

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