Gknot (again)

George Tatum · **Posted:** Tue Feb 10, 2004 6:05 pm **Post subject:** Gknot (again)

Following the valuable advice I received last week I have followed the Doom9 instructions for using Gknot and it produced a file of exactly 700MB, however the compressibility test produced a very low percentage and to get it in the 40-60% range I had to adjust the output resolution to 352x272, I think I started at either 512x400 or 544x432 prior to running the compressibility test. Everything else looks fine. Is this OK or should I be doing something else that's not in the Doom9 document?

Filesize.....: 700 MB (or 716,850 KB or 734,054,400 bytes)
Runtime......: 01:29:36 (134,409 fr)
Video Codec..: XviD
Video Bitrate: 958 kb/s
Audio Codec..: 0x0055(MP3) ID'd as MPEG-1 Layer 3
Audio Bitrate: 128 kb/s (64/ch, stereo) CBR
Frame Size...: 352x272 (1.29:1) [~13:10]

ViSCeRaL · **Posted:** Tue Feb 10, 2004 6:08 pm **Post subject:**

After good advice from PC_Arcade I found that adjusting the resolution until you get ~16 bits/pixel per frame, regardless of whether the output value goes red or not, gives a good looking video with best resolution.

Polityk · **Posted:** Tue Feb 10, 2004 6:50 pm **Post subject:**

*moved*

spudthedestroyer · **Posted:** Tue Feb 10, 2004 6:54 pm **Post subject:**

DJBenz wrote:

After good advice from PC_Arcade I found that adjusting the resolution until you get ~16 bits/pixel per frame, regardless of whether the output value goes red or not, gives a good looking video with best resolution.

for a 1cd rip anyways

@George, the rip is way out at that res. you shouldn't go below 512x horizontal res unless its an absolute, must, final, total and last ditched resort. Ignore the compressibility test, and follow what DJ said.

One final point, drop CBR, its a total waste of bits, use VBR 128kb/s. There is little need for CBR I don't think, it wastes too much data.

George Tatum · **Posted:** Tue Feb 10, 2004 6:55 pm **Post subject:**

DJBenz wrote:

After good advice from PC_Arcade I found that adjusting the resolution until you get ~16 bits/pixel per frame, regardless of whether the output value goes red or not, gives a good looking video with best resolution.

OK I'll give it another go, thx DJ :beerchug:

George Tatum · **Posted:** Tue Feb 10, 2004 7:00 pm **Post subject:**

spudthedestroyer wrote:

@George, the rip is way out at that res. you shouldn't go below 512x horizontal res unless its an absolute, must, final, total and last ditched resort. Ignore the compressibility test, and follow what DJ said.

One final point, drop CBR, its a total waste of bits, use VBR 128kb/s. There is little need for CBR I don't think, it wastes too much data.

Thx Spud, I knew the res was unacceptable and hoped someone could help me on the forums but didn't realise the probs with CBR. :beerchug:

George Tatum · **Posted:** Tue Feb 10, 2004 10:16 pm **Post subject:**

spudthedestroyer wrote:

One final point, drop CBR, its a total waste of bits, use VBR 128kb/s. There is little need for CBR I don't think, it wastes too much data.

Once again sorry for being an annoying noob but I tried this in BeSweet (selected MP3 in the Lame frame, clicked on Lame2 and selected VBR, then maximum allowed bitrate = 128), and it produced an MP3 with min & max bitrate both = 128 (my min was set to the default 32). Should I have set a lower max? When I used the default max of 320 it produced a file with an average of 148.

PC_Arcade · **Posted:** Tue Feb 10, 2004 10:40 pm **Post subject:**

mmm, I wouldn't bother re-encoding the audio from the already transcoded mp3, if you want VBR then re-encode from the .ac3

Having said that I prefer to work with CBR because you can produce a sample file a damn sight easier also the saving with VBR isn't all that great anyway IMHO

spudthedestroyer · **Posted:** Tue Feb 10, 2004 11:18 pm **Post subject:**

Quote:

Having said that I prefer to work with CBR because you can produce a sample file a damn sight easier also the saving with VBR isn't all that great anyway IMHO

Encode the mp3 and work with filesize not bitrate, first step to take with every rip (actually select the file then in gknot and simply mux at the end). The bitrate saving is very significant, normally about 20mb which should be spent on video.

The audio is also encoded better, you get more data spent on active scenes, and less on quiet scenes.

PC_Arcade · **Posted:** Tue Feb 10, 2004 11:34 pm **Post subject:**

I (and PS22) had problems with cutting a section of VBR encoded .avi's for use as a sample, never used VBR since. Maybe it's time I took another look.

ViSCeRaL · **Posted:** Wed Feb 11, 2004 1:35 pm **Post subject:**

Scene releases get nuked for use of CBR.

PC_Arcade · **Posted:** Wed Feb 11, 2004 2:03 pm **Post subject:**

DJBenz wrote:

Scene releases get nuked for use of CBR.

Right, I'd better start using VBR again then

spudthedestroyer · **Posted:** Wed Feb 11, 2004 9:51 pm **Post subject:**

DJBenz wrote:

Scene releases get nuked for use of CBR.

as mentioned above, it really shouldn't be used in professional rips as you try and save every bit possible for where its needed.

Didn't recall they got nuked for that, but it makes sense

ohgodnotanotherone · **Posted:** Thu Feb 12, 2004 5:45 pm **Post subject:**

Shit if I can find the link right now , but vbr isn't such a blessing at all.....
Something about 2 streams... hang on...

spudthedestroyer · **Posted:** Thu Feb 12, 2004 5:52 pm **Post subject:**

you sure that wasn't Ghostbusters?

George Tatum · **Posted:** Thu Feb 12, 2004 6:00 pm **Post subject:**

ohgodnotanotherone wrote:

Shit if I can find the link right now , but vbr isn't such a blessing at all.....
Something about 2 streams... hang on...

Bollocks, just when the rip was done

Well I'm happy with this one

Filesize.....: 700 MB (or 716,820 KB or 734,023,680 bytes)
Runtime......: 01:29:36 (134,409 fr)
Video Codec..: XviD
Video Bitrate: 986 kb/s
Audio Codec..: 0x0055(MP3) ID'd as MPEG-1 Layer 3
Audio Bitrate: 97 kb/s (48/ch, stereo) VBR LAME3.90.?
Frame Size...: 544x432 (1.26:1) [~5:4]

spudthedestroyer · **Posted:** Thu Feb 12, 2004 6:04 pm **Post subject:**

@george, don't worry i've heard articles like it before, they're sometimes very obscure and contain a lot of technical 'theory'; however you can be assured that VBR is better than CBR when it comes to one cd rips especially.

When it comes to 2cds however, that can be a different kettle of fish.

DxaKrator · **Posted:** Sun Feb 15, 2004 3:39 am **Post subject:**

I got a question,When I have gnot do the split into 2 cd option it ends up making 2 files that are over 2gb in size...I swear I have used this option before and it came out perfect but over the last few days it has done it to 3 dvds.What the hell have I done wrong all of a sudden?The main file that it was split from is correct in size(about 1.4gb for a 2 cd rip)this isn't a huge issue since I can do it maually with vdub but would like to figure out what I am not doing right here.

Probably something simple that I will kick myself in the ass for as usual. :roll:

spudthedestroyer · **Posted:** Sun Feb 15, 2004 4:13 am **Post subject:**

what codec are you using to encode. Xvid 1.0 isn't yet supported, you must use an earlier codec, or better, just use gknot as a bitrate calculator, create an avs file and then use virtualdubmod to do the leg work from the avs file gknot made.

Gknot (again)

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