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Limiting factors for encoding and transcoding.

Discussion in 'General Hardware' started by Foxor`, 9 May 2006.

  1. Foxor`

    Banned

    Joined: 23 Oct 2003

    Posts: 580

    Location: Cambridge

    I do quite alot of encoding and transcoding on my pc (specs in sig) and it takes a while to change stuff to dvd format from VCD or Divx. Using nero7 it takes;


    1.36gb divx to dvd = 1hour 12mins
    2x700mb VCD to dvd = 3hours 50mins

    Thats a long time for both really. and id like to cut down the time it takes to transcode vcd's to dvd. Any ideas? is Raid 0 the solution?
     
  2. vanandjuanunited

    Soldato

    Joined: 20 Oct 2005

    Posts: 5,523

    Might help if we could see your sig. Its too big. :p
     
  3. Foxor`

    Banned

    Joined: 23 Oct 2003

    Posts: 580

    Location: Cambridge

    Intel(R) Pentium(R) 4 CPU 3.60GHz (2 CPUs)
    3068MB RAM
    RADEON X1800 Series
    SB X-Fi Audio [C8A0]
    Maxtor 7L250S0
     
  4. Energize

    Caporegime

    Joined: 12 Mar 2004

    Posts: 28,884

    Location: England

    Processor is the main factor, upgrade that to see a boost.

    You didnt mention how long those videos were. Encoding speed isnt based on filesize its based on the frames rendered.

    A 3hr film at 1.36gb will take 3x as long as a 1 hour film at 1.36gb.
     
    Last edited: 9 May 2006
  5. Foxor`

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    Joined: 23 Oct 2003

    Posts: 580

    Location: Cambridge

    the vcd's cd1 is 1hour 2mins and cd2 is 52mins
    the divx is 102mins thats loads better quality then the vcd tho.

    does nero take advantage of dc cpu's? i dought a 3.8ghz (im assuming thats the fastest singlecore they make(bar the over priced EE chips) would make much of a diff

    Foxor
     
  6. Orifice

    Man of Honour

    Joined: 1 Oct 2002

    Posts: 5,521

    Using nero 7 to encode a 1.37gb file takes about 42 mins, using a Pentium D 830, it seems to take advantage of both cores as according to task manager its using 97%.

    If its the 660 in your sig that your using, then its only hyperthreading, which is pretty useless for encoding, you need true dual core.
     
  7. Energize

    Caporegime

    Joined: 12 Mar 2004

    Posts: 28,884

    Location: England

    How long is the 1.37gb file though? Like I said, its frames rendered not filesize that determines how long it takes. Knowing the filesize doesnt help when you dont know how long the video lasts.
     
    Last edited: 10 May 2006
  8. fornowagain

    Sgarrista

    Joined: 3 Nov 2004

    Posts: 9,835

    Location: UK

    I haven't looked into this to closely, so it may not be what you need. But the ATI x1*** cards have hardware encoding. I used it to convert some MPEG to DIVX and it was a LOT quicker than VirtualDub (cpu).
     
  9. Foxor`

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    Joined: 23 Oct 2003

    Posts: 580

    Location: Cambridge




    i know the diff between logical and physical cores :)
     
  10. Foxor`

    Banned

    Joined: 23 Oct 2003

    Posts: 580

    Location: Cambridge

    the vcd's cd1 is 1hour 2mins and cd2 is 52mins
    the divx is 102mins thats loads better quality then the vcd tho.

    1.3gb = 102mins
    2x700 - 124mins

    time to encode

    1.36gb divx to dvd = 1hour 12mins
    2x700mb VCD to dvd = 3hours 50mins
     
  11. Energize

    Caporegime

    Joined: 12 Mar 2004

    Posts: 28,884

    Location: England

    Somethings wrong with that time for vcd to dvd it shouldnt be anywhere near that amount of time. The vcd is only 114mins long, it should be roughly the same length as the divx one, not more than 3x longer. What program are you using because with a 3.8ghz cpu you should be getting less than a 1:1 encoding ratio, I would have thought that you'd be getting 1:0.75 at the worst. Unless your using two pass encoding?

    Try svcd2dvd, is one of the best programs out there for dvd conversion, it might be the software that your using.
     
    Last edited: 10 May 2006
  12. hhhhbk

    Wise Guy

    Joined: 1 Apr 2004

    Posts: 1,125

    CPU and software are what have major effects

    your processor is fine
    dvdsanta was pretty quick at turning video files into dvds
    sadly it doesnt seem to want to work since i installed SP2 and i havent got around to fiddling with it yet
     
  13. Foxor`

    Banned

    Joined: 23 Oct 2003

    Posts: 580

    Location: Cambridge


    3.6ghz cpu.
    Nero7
    Two pass encoding is on yes. Shall i turn this off - will it decrease the image quality alot? Im pretty fussy on how a film/programs looks(in terms of picture quality), or i wont watch it.

    Going to try the programs suggested
     
  14. Energize

    Caporegime

    Joined: 12 Mar 2004

    Posts: 28,884

    Location: England

    Its upto you, Personally I dont notice a difference from single pass to 2 pass on xvid to dvd conversion so I have it off because it doubles the encode time, using 2 pass with vcd to dvd is pointless though because the dvd at cbr will still be the same quality however many passes you make. And if your using 2 pass encoding with a constant bitrate, don't.