Preview Question

[The Old Timer]

I'm still confused as to exactly whats happening with the preview. I just ran a preview which took less than 2 minutes for a 2 hour video. I have had it take 10 minutes or more. The preview has no audio playing. Is it supposed to?

The Video quality as displayed appears to be good. Is this the same quality that I will end up if click the start button? If I do click the start button I'm sure that trans-coding will take about 3 hours or more. If The quality that I end up with is the same as what I previewed what accounts for the enormous difference between the 2 times? Is the time spent mainly in demuxing & remuxing?

Thanks for any advise.

[BigDid]

I'm still confused as to exactly whats happening with the preview. I just ran a preview which took less than 2 minutes for a 2 hour video. I have had it take 10 minutes or more. The preview has no audio playing. Is it supposed to?
Hi,

If you are talking about AutoGK, yes this is what the preview is supposed to do: run DGindex which gives a d2v file which is used in the avisynth script (preview.avs) which launches the preview

The Video quality as displayed appears to be good. Is this the same quality that I will end up if click the start button?
1/What is displayed is the source (mpeg2 file or VOB) cropped, filtered and eventually deinterlaced, not the xvid-mpeg4 rencoded final file. Only exception would be original beeing an avi file(xvid or dix or other mpeg4 codec)
2/ The destination quality will approach the original (transparancy) if:
-sharpmatrix is used
-720 or original width is retained by AGK( retained automatically by AGK, not declared as fixed width); this is done by giving enough size to the destination file;
* see thread: redo first pass... why?

If I do click the start button I'm sure that trans-coding will take about 3 hours or more. If The quality that I end up with is the same as what I previewed what accounts for the enormous difference between the 2 times?
See above for difference between mpeg2 source and mpeg4 destination; it is not transcoding, it is encoding (or recoding) with a different codec, mpeg4: xvid

Is the time spent mainly in demuxing & remuxing?
For 3 hours 2 pass, you have more or less:
30mn analysis, audio recoding and comptest;
60 mn first pass
90 mn second pass

Please take the time to review these basics with the different guides provided in the doom9 web pages: http://www.doom9.org/guides.htm
and search the forum ; it has been reviewed lots and lots already. Hope your questions have been answered and the answers are understandable

Did

[The Old Timer]

Thanks for that reply. I was surprised to see that you suggest that the first pass is faster. I have often seen the second one faster but maybe this is because I have reduced the size too much & that a lower resolution has been chosen.

[BigDid]

Thanks for that reply. I was surprised to see that you suggest that the first pass is faster. I have often seen the second one faster but maybe this is because I have reduced the size too much & that a lower resolution has been chosen.
Post a log if you want some comments; here is an extract of one of an (old) mpeg2 anim capture:

[19/09/2005 02:30:24] AutoGK 2.13b
[19/09/2005 02:30:24] OS: WinXP (5.1.2600).2
[19/09/2005 02:30:24] Job started.
[19/09/2005 02:30:24] Input file: UVS050918-003.MPG
[19/09/2005 02:30:24] Output file: F:\WinFast WorkArea\Chateau ds le ciel 1,1.avi
[19/09/2005 02:30:24] Output codec: XviD
[19/09/2005 02:30:24] Audio1: Audio Stream 0 MPEG
[19/09/2005 02:30:24] Subtitles: none
[19/09/2005 02:30:24] Format: .AVI
[19/09/2005 02:30:24] Target size: 1110Mb
[19/09/2005 02:30:24] Custom resolution settings: minimum width of 512 pixels
[19/09/2005 02:30:24] Custom audio settings: VBR MP3 with average bitrate: 160Kbps
[19/09/2005 02:30:24] Started encoding.
[19/09/2005 02:30:24] Demuxing and indexing.
[19/09/2005 02:33:48] Processing file: WorkArea\UVS050918-003.MPG
[19/09/2005 02:33:48] Source resolution: 720x576
[19/09/2005 02:33:48] Found PAL source.
[19/09/2005 02:33:48] Source aspect ratio: 4:3
[19/09/2005 02:33:48] Analyzing source.
[19/09/2005 02:39:10] Source has percentage of interlacing in motion areas: 80,71
[19/09/2005 02:39:10] Source is considered to be interlaced.
[19/09/2005 02:39:10] Output will contain 178978 frames
[19/09/2005 02:39:10] Encoding audio.
[19/09/2005 02:46:17] Picking up credits information.
[19/09/2005 02:46:17] Credits start frame: 175250
[19/09/2005 02:46:17] Credits quality percentage: 20
[19/09/2005 02:46:17] Audio1 size: 145,444,992 bytes (138.71 Mb)
[19/09/2005 02:46:17] Overhead: 7,159,168 bytes (6.83 Mb)
[19/09/2005 02:46:17] Video size: 1,011,315,200 bytes (964.47 Mb)
[19/09/2005 02:46:17] Running compressibility test.
[19/09/2005 02:46:17] Writing the following script to F:\WinFast WorkArea\agk_tmp\Chateau ds le ciel 1,1_comptest.avs
===========================================================


===========================================================
[19/09/2005 02:54:45] Duration was: 8 minutes 27 seconds
[19/09/2005 02:54:45] Speed was: 17,63 fps.
[19/09/2005 02:54:45] Compressibility percentage is: 25,34
[19/09/2005 02:54:45] Using softer matrix.
[19/09/2005 02:54:45] Using softer resizer.
[19/09/2005 02:54:45] Chosen resolution is: 560x304 ( AR: 1,84 )
[19/09/2005 02:54:45] Predicted comptest value is: 55,58
[19/09/2005 02:54:45] Running first pass.
[19/09/2005 02:54:45] Writing the following script to F:\WinFast WorkArea\agk_tmp\Chateau ds le ciel 1,1_movie.avs
===========================================================


===========================================================
[19/09/2005 03:54:20] Duration was: 59 minutes 35 seconds
[19/09/2005 03:54:20] Speed was: 50,06 fps.
[19/09/2005 03:54:21] Expected quality of first pass size: 56,38
[19/09/2005 03:54:21] Running second pass.
[19/09/2005 05:21:45] Duration was: 1 hour, 27 minutes 24 seconds
[19/09/2005 05:21:45] Speed was: 34,13 fps.
[19/09/2005 05:21:45] Job finished. Total time: 2 hours 51 minutes 20 seconds


Did