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Dodgey videa playback

  • 12-01-2005 9:07pm
    #1
    chump
    Closed Accounts Posts: 3,807 ✭✭✭


    I've dl'ed a few *trailers* off the interweb...
    I've encountered a few problems when playing SOME of these on my lidl divX player ... the problems:
    Slight dubbing problems, ie. sound not quite same pace as vid, although this seems to go with below

    Crappy framerate... sound & picture quality excellent yet just a bit jerky -watchable but not smoooooth.
    The thing about this is the reported fps is quite slow, 23-24fps - yet some other files with the same fps are grand...
    The funny thing is the technically better specced file ran jerkier than the lesser one.

    Two recent trailers, HB, BSunSet, have had this issue when played on tv... both are xvid, one is 148kbps, other 98 ...
    yet another xvid with very similar qualities is grand...
    The trailers that are 25/-29fps seem to play grand...

    Also I have some mpg's ... well 2, 1 shows up on a cd in the player, the other doesn't (it's a kvcd mpeg1 file)... all the avi's always show up...

    And what are SVCD, VCD files? Show they be burnt as video cd's and not just copied as raw data?


Comments

  • #2
    Mutant_Fruit
    Closed Accounts Posts: 4,943 ✭✭✭Mutant_Fruit


    SVCD/VCD's are just mpg files burnt on CD.

    IF you burn them as normal data, you can fit at most a 700meg file. If you burn them as an SVCD/VCD you can burn at most an 800meg file. Burning as an SVCD is therefore better. Google if you want an explanation as to why that happens.

    Could the chopiness be due to NTSC video clips not playing back right?


  • #3
    chump
    Closed Accounts Posts: 3,807 ✭✭✭chump


    It doesn't make much sense to me...
    I've just been bopping them across in nero as files, just like I would mp3's... so what's with the vcd, svcd referencing?

    I've been reading doom9 ... and gooling, it seems the player might have trouble playing back some vids for other folk... http://forum.digital-digest.com/archive/topic/44775-1.html

    Although that's the only one I found...

    Is there anyway I can decode the divX and then re-encode it possibly in different 'type' of divX...

    and is there any tool that helps me find out every possible piece of info about a video file, ie. what version os which codec etc...?

    grateful for any help


  • #4
    zilog_jones
    Registered Users, Registered Users 2 Posts: 6,638 ✭✭✭zilog_jones


    GSpot will tell you everything there is to be told about AVI files. VCD/SVCD *ARE NOT* just MPEG video stuck on a CD - you have to author them properly just like you would with a DVD video as things have to go in certain places and whatnot. However your DivX player may be able to play MPEG files just stuck on a standard (ISO9660) CD-R.

    I don't think re-encoding is the solution to your problem as whatever you do it's just gonna make the video a lot worse. It could just be badly-encoded in the first place, or using something screwy, or some specifications that your player doesn't support properly (and there's a lot of issues like that with these) - that last one could explain why the better quality video ran worse on your player. A lot of players seem to have problems mostly with full-spec XviD (a superior codec than DivX 5).

    Also, those bitrates you noted - 98 and 148kbps - must have been the bitrates of the audio. You couldn't make watchable XviD/DivX video out of bitrates that low! They should be at least around 300kb/s...


  • #5
    Mutant_Fruit
    Closed Accounts Posts: 4,943 ✭✭✭Mutant_Fruit


    VCD/SVCD *ARE NOT* just MPEG video stuck on a CD - you have to author them properly just like you would with a DVD video as things have to go in certain places and whatnot. However your DivX player may be able to play MPEG files just stuck on a standard (ISO9660) CD-R.
    Yeah i suppose you're right, what i was referring to is that the video files are just standard mpg files, and not specially encoded in a special format like vob's for DVD's.

    Often you can get away with not reencoding an MPG file by just burning it as data. I've never met a DVD player that couldn't play a DATA cd with mpg's on em when it already supports (S)VCD's


  • #6
    zilog_jones
    Registered Users, Registered Users 2 Posts: 6,638 ✭✭✭zilog_jones


    I've heard of some that can support MPEG like that - maybe it's more common with new players?

    DVD video doesn't have to be re-encoded - VOBs are just MPEG-2 video and whatever else multiplexed. VOB is a format of "container". I think.


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  • #7
    Mutant_Fruit
    Closed Accounts Posts: 4,943 ✭✭✭Mutant_Fruit


    zilog_jones wrote:
    DVD video doesn't have to be re-encoded - VOBs are just MPEG-2 video and whatever else multiplexed. VOB is a format of "container". I think.
    you have to have very specific video sizes for DVD aswell, and so most videos have to be reencoded to the correct size, i've never had to reencode an mpg to play it as a (s)vcd.


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