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Thread: MUX'ing, VSplit, and MPG2 files.

  1. #886
    Join Date
    Jan 2002
    Posts
    4,809
    Ok. Sorry obviously I was clear enough. I meant to be but hey I knew what I wast talking about...

    Ok. To find a hole, and I used that terminology on purpose. Do the following (this is just like before from way way way back when):

    vsplit -n input.ty junk.m2v junk.m2a > junk.txt

    Spefically use the first version of the #13 release that was pre-mux'ing. I did leave this part out. Sorry... Then edit the junk.txt file. It will be small so even note pad can be used.

    The in junk.txt look for the word "hole" in the text. It will be part of an OOB line. A simple search for hole in the file will be good enough to find it.

    the -n says no output for audio or video files, which makes it faster to un. The non mux mode, i.e. no -m flag, makes it ignore the mux'er step (but that needed version did not contain it anyway...) and run the whole thing from start to finish.

    It will also ignore the reseting PTS/DTS fix that went into #13c I think. So I guess #13 from the sticky thread really is the best one to try.

    Once you identify a problem either write it down for now, or actually use TyFileSplit to cut the segment of the file that contains the problem. 20-50 chunks is pretty much what is needed for things to run.

    Do keep in mind that the result of a TyFileSplit call can be used as input to vsplit so it is easy to test it and see if what was cut contains the same problem.

    Look for anything that is not a standard process. But keep in mind:

    - Not every OOB is bad, it has to have the word "hole" in it.
    - If it stops splitting and gives nothing but OOB reports to the end of the file (from more than the very end like always...) then you have found a problem.
    - If you are not certain send me the short simple .txt output file and I will tell you what you have found.

    --jdiner

    Changed. To specifically reference the version #13 from the sticky thread...
    Last edited by jdiner; 11-11-2002 at 01:32 PM.

  2. #887
    Join Date
    May 2002
    Location
    West Hartford CT
    Posts
    620

    720x480 <-> 480x480 ? audio ?

    I'm wondering as I look at my perfectly in-sync streams , dreaming about the day that the "chunk restriction" will be lifted...

    Right now I have some great streams, and play great on my PC, but will the audio upsample take place during the mux process? I'm assuming the DTiVo audio is 32khz and must be upsampled for compliance for either DVD or VCD/SVCD.

    Is this just a non-issue? I'm all for "direct2VOB" for those Showtime or HBO movies but what about those 1/2hour shows that fit prefectly on a SVCD? I guess I could put 5-6 of them on a DVD-R ?

    anyway ... just wonder'in GREAT work jdiner! You are the guy that is making all this possible!
    ~Hi8

    (4) Hughes SD DVR40
    (1) Hughes HR10-250
    (2) xbmc XBOX X2 & xbit

  3. #888
    Join Date
    Jan 2002
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    1,030
    DTivo audio is 48khz
    SA tivos audio is 32khz

    SVCD is 44.1
    DVD is 48

    if target is DVD and you are using DTivo not need to change the audio.

  4. #889
    Join Date
    Aug 2002
    Posts
    30

    Re: A hole?

    Done, but not a hole, by your definition.


    Originally posted by jdiner
    Yeah. Grab TyFileSplit and do a:

    TyFileSplit inp.ty out.ty 700 50

    That should be more than enough to figure out what is going on in that clip.

    --jdiner

  5. #890
    Join Date
    Apr 2002
    Location
    Wales UK
    Posts
    26
    Hi Joel, you said the debug had been cut right back is the following expected? This is from a UK 2.5 SA stream
    Plays just fine in Power DVD sync is good to end but there seem to be some clicks in the audio.

    .### The Vid Body is off! 20 50 40 -> 2D 12 40 diff == 0xFFF33E00 (-836096)
    .### The Vid Body is off! 20 50 40 -> 2D 12 40 diff == 0xFFF33E00 (-836096)
    $$$ The Aud Body is off! 2D 12 40 -> 2E BB 80 diff == 0xFFFE56C0 (-108864)
    ### The Vid Body is off! 20 50 40 -> 2D 12 40 diff == 0xFFF33E00 (-836096)
    .### The Vid Body is off! 20 50 40 -> 2D 12 40 diff == 0xFFF33E00 (-836096)
    .### The Vid Body is off! 20 50 40 -> 2D 12 40 diff == 0xFFF33E00 (-836096)
    ### The Vid Body is off! 20 50 40 -> 2D 12 40 diff == 0xFFF33E00 (-836096)
    2000


    A/V Sync Offset: 13ms (i.e. plays 13ms early!)
    MUX: Padded the output by 860 bytes...

  6. #891
    Join Date
    Sep 2002
    Posts
    231
    I second the SA Tivo Audio and resolution thing. I would love to have it as one step from Ty -> VOB, but the audio is at the wrong frequency and the resolution for all my current Tys are 480x480.

  7. #892
    Join Date
    Jan 2002
    Location
    Sonoran Desert
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    2,829
    I know pretty much null about mpeg whatnots, but just curious, what causes a buffer underrun? Is this what causes our audio to lose sync when we attempt to modify the mpeg file with any other programs?
    Before PMing me: Iím not your personal tech support. If you have a question, ask in public so I don't have to repeat if somebody else asks. If you want images or slices, use emule. I will ignore all support PMs.

    Sponsor a vegetarian! I have taken the pledge, how about you?

  8. #893
    Join Date
    Sep 2002
    Posts
    140
    Here are two files I did off my DTiVo

    This one has AC3 "SpyGame"

    Processing 'spygame.ty': (10 chunks per tick)
    Detected Tivo Type: DTivo
    Detected Audio Stream Type: Dolby Digital 5.1
    Final standardAudioSize = 1552

    Final standardFrameLength = 1536

    Final standardAudioDiff = 2880 or 00:00:00.032
    First Video PTS: 00:00:19.398
    ......... 100......... 200......... 300......... 400......... 500
    ......... 600......... 700......... 800......... 900......... 1000
    ......... 1100......... 1200......... 1300......... 1400......... 1500
    ......... 1600......... 1700......... 1800......... 1900......... 2000


    A/V Sync Offset: 10ms (i.e. plays 10ms early!)
    MUX: Padded the output by 0 bytes...

    This one is just normal. "Birds of Prey"

    Processing 'birds.ty': (10 chunks per tick)
    Detected Tivo Type: DTivo
    Detected Audio Stream Type: MPEG Layer II
    Final standardAudioSize = 492

    Final standardFrameLength = 480

    Final standardAudioDiff = 2160 or 00:00:00.024
    First Video PTS: 00:02:28.989
    ......... 100......... 200......... 300......... 400......... 500
    ......... 600......... 700......... 800......... 900......... 1000
    ......... 1100......... 1200......... 1300......... 1400......... 1500
    ......... 1600......... 1700......... 1800......... 1900......... 2000


    A/V Sync Offset: 5ms (i.e. plays 5ms early!)
    MUX: Padded the output by 0 bytes...

    Matt

  9. #894
    Join Date
    Nov 2001
    Posts
    64

    Question command line

    Excuse me for a very elementary question but I havn't been able to find the answer on my own so here goes. ......just exactly what is the command line to run vsplit1k. ???

    Deter


    PS: i think i got it with vsplit1k -m 20.ty junk.m2v junk.m2a
    Last edited by DeTer; 11-11-2002 at 08:18 PM.

  10. #895
    Join Date
    Sep 2002
    Posts
    110

    Re: command line

    Originally posted by DeTer
    Excuse me for a very elementary question but I havn't been able to find the answer on my own so here goes. ......just exactly what is the command line to run vsplit1k. ???

    Deter


    PS: i think i got it with vsplit1k -m 20.ty junk.m2v junk.m2a
    type in "vsplit1k -h" without quotes and it will give you all of the avaliable options.

    Rowan

  11. #896
    Join Date
    Nov 2001
    Posts
    64

    Re: Re: command line

    Originally posted by Rowan
    type in "vsplit1k -h" without quotes and it will give you all of the avaliable options.

    Rowan
    Rowan


    Thanks for the reply, i have used the -h for help. I have used vsplit before but just can't figure out the muxing and what the file out put file should be. I ran the command line I posted above and ended up with and m2a & m2v......only the video had bytes.
    Thx again
    DeTer <-------kinda stupid......but not totally just new

  12. #897
    Join Date
    Sep 2002
    Posts
    110

    Re: Re: Re: command line

    Originally posted by DeTer
    I posted above and ended up with and m2a & m2v......only the video had bytes.
    [/B]
    Yes, that is kinda confusing but total expected. The commandline interface still needs the m2a (or whatever you called it) file name there but it is not used. It is created but as you see it has zero bytes, the real muxed output is in the m2v file. Just ignore the other zero byte file when using the muxing option.

    Rowan

  13. #898
    Join Date
    Oct 2002
    Posts
    21

    Re: 720x480 <-> 480x480 ? audio ?

    Originally posted by Hi8
    Right now I have some great streams, and play great on my PC, but will the audio upsample take place during the mux process? I'm assuming the DTiVo audio is 32khz and must be upsampled for compliance for either DVD or VCD/SVCD.
    Audio is at 48khz. I guess the audio for SVCD's is supposed to be 44.1khz, but just for giggles I took the mux'ed mpeg file from vsplit1k and ran it through VCDImager, and it played on my friend's DVD player, though the audio was off by a second (which was not the case when I viewed the mpg file from my PC). I was going to run it through Nero or some other SVCD generating program to see if that would help.. It would be great to be able to just vsplit and burn, 5 minute SVCD's...

  14. #899
    Join Date
    Feb 2002
    Posts
    54
    48 KHZ is fine for DVD. The problem as I understand it is that SA tivo's record at 32 KHZ (I don't have one).

    The only thing I'm positive requires 44.1 khz is redbook audio. DVD format is definetely 48 khz, and I think SVCD is also. I don't really know about VCD though.

  15. #900
    Join Date
    Jan 2002
    Posts
    4,809

    Re: 720x480 <-> 480x480 ? audio ?

    Originally posted by Hi8
    Right now I have some great streams, and play great on my PC, but will the audio upsample take place during the mux process? I'm assuming the DTiVo audio is 32khz and must be upsampled for compliance for either DVD or VCD/SVCD.
    Someone else here on the forum has been helping me with the transcoding of the audio segment. It is not that hard a process just nothing something I have even had time to look at in anyway.

    He is working over some code for me that will allow the users of vsplit/tytool to automatically change the bit-rate of the audio stream from 32 to 44.1 or 48 depending on what is needed and from 48 to 44.1 if needed.

    Once that is in place the SVCD mode (2324 output chunks) output should run in just about any SVCD enabled dvd player.

    Someone mentioned that audio is off by ~1 second. As near as I can tell from what I have read the problem is that you are out of the defined spec and it just doesn't like that.

    When I tried it here the APEX I have did the same thing to me.

    --jdiner

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