AutoGK 2.40 quality problem with PDA

[mipop35]

Hi,
I used AutoGK 2.27 for transcoding video for an iPaq 1940 ppc for a long time without any problem.
I used 2mb/minute size, VBR MP3 80kbps, fixed with of 320 px (the native with of the device) and XviD. The quality results were pretty good, better than any other tool I tested.

Last night I apply the 2.27 to 2.4 update patch with very bad quality results. The video quality is very poor, very blocked. I keep using the same settings, so I don't see how to resolve the problem.

Can I uninstall XviD 1.2 and install 1.1 again keeping AutoGK 2.4? Or should I rollback AGK to 2.27?

I will appreciate any help.
Thanks in advance

Diego

[len0x]

you can use version of XviD bundled with 2.27, but are you saying that playback on PC is ok even with latest 2.40, but not on your PDA ?

[mipop35]

I didn't explain myself well. Playback is of poor quality in both PC (VLC) and PDA (TPCMP).

But analyzing the file and the log for the making of this reply I think I found what hapened.
The setting were:
[12/21/2006 1:31:27 PM] Format: AVI
[12/21/2006 1:31:27 PM] Target size: 100Mb
[12/21/2006 1:31:27 PM] Custom resolution settings: fixed width of 320 pixels
[12/21/2006 1:31:27 PM] Audio 1 settings: VBR MP3 with average bitrate: 80Kbps

The file is of 50 mins -> 2Mb/min. Minus 80kbps audio leaves about 180kbps video as I always used, but opening the resulting file with G Spot It tells that the audio is 192 kb/s total (the original stream), thus left for video 92kbps instead of the 180kbps.

looking at the log seems that the problem is that it doesn't reencode audio, so the size left for video is too small:

[12/21/2006 1:46:15 PM] Demuxing audio.
[12/21/2006 1:46:15 PM] Writing the following script to D:\video\ppc\history\ww2\agk_tmp\lastjob.vcf
===========================================================
VirtualDub.Open("D:\\shared\\incoming\\xvid\\documentary\\history\\ww2\\Biografia - (History Channel).avi",0,0);
VirtualDub.video.SetMode(0);
VirtualDub.video.filters.Clear();
VirtualDub.subset.Delete();
VirtualDub.stream[0].SetMode(0);
VirtualDub.stream[0].Demux("D:\\video\\ppc\\history\\ww2\\agk_tmp\\Biografia - (History Channel)_track1.mp3");
===========================================================
[12/21/2006 1:46:51 PM] Audio1 size: 71,998,764 bytes (68.66 Mb)
[12/21/2006 1:46:51 PM] Overhead: 892,032 bytes (0.85 Mb)
[12/21/2006 1:46:51 PM] Video size: 31,966,804 bytes (30.49 Mb)
[12/21/2006 1:46:51 PM] Running compressibility test.
[12/21/2006 1:46:51 PM] Writing the following script to D:\video\ppc\history\ww2\agk_tmp\Biografia - (History Channel)_comptest.avs
===========================================================

I have the complete log in case of need.

Diego

[zacoz]

From Official AutoGK FAQ (http://forum.doom9.org/showthread.php?t=72679) (emphasis added)

5.12 What are limitations/features of AVI input mode?
- your OS has to be able to decode input AVI via Dshow (note sometimes decoder, for instance ffdshow, has problems with certain type of video, so you have to change it. See here for example problem: http://forum.doom9.org/showthread.php?t=92047)
- no denoising is done for AVI mode except for DV sources
- no cropping is done for AVI mode apart from the one needed to keep AR (if you need it then enable it via hidden options)
- DV sources are detected via "dv" string in 4cc and appropriate AR resizing is performed (AR is 1.095 or 0.909). Original AR option won't work for such sources.
- only DV type 2 files are supported
- Analysis step is only performed for DV source (for deinterlacing)
- BFF is assumed for DV sources
- input audio can be PCM(always encoded)/MPA(kept/encoded)/MP3(always kept)/AC3(encoded/kept)/DTS(encoded/kept)
- if your DV source is 16:9 then you need to enable this AR in hidden options as AutoGK can't detect that.
- mp3 re-encoding is not possible due to LAME crashing on most mp3 sources
- sometimes LAME has issues with 11KHz PCM input audio, so it might need to be processed manually.

[mipop35]

zacoz, you are completely right. Thanks for the tip. I searched through files recoded with 2.27 and found that they keep the original mp3 stream.

But... I also found that the video quality of those files is far better than what I got with AGK 2.4, with video bitrates as low as 69kbps. That's the reason why I didn't noticed the problem with AGK 2.27. So I think I'll go back to xvid 1.1/AGK2.4 and see what happens.

thanks,
Diego