Interlaced playback in qtpro7 on 1 mac and deinterlaced in qt7 on 2nd mac?

howdy folks!
i've got a g4 dual 1.42ghz tower running quicktime pro 7.2.0 and a 17" macbook pro running quicktime 7.2.0...
currently i'm exporting movies from imovie (although i'm learning fcp 5.1) using either full quality or expert settings...(btw, what are the full quality settings?)
the quicktime pro on the g4 plays full quality .dv movies with interlaced lines while the regular quicktime on the macbook pro plays the same file back deinterlaced...
1.   how do i get the quicktime pro on the g4 to playback deinterlaced movies?
2.   does quicktime playback actually affect the final output to dvd? (e.g. if i cannot fix this deinterlaced playback issue, is it affecting my final dvd product)
3.   is there an actual quality difference with compression and export going from fcp 5.1 > dvd studio pro 4 / imovie hd 6 > dvd studo pro 4 / imovie hd 6 > idvd 6?
thank ya kindly for your support!
cheers, howdy

2. does quicktime playback actually affect the final output to dvd?
It shouldn't, but unfortunately some apps stubborny honor the playback quality setting when processing the input files!
For example: if you want interlaced video-DVD output from Toast 7, you must manually remember to set the iMovie reference.mov to High Quality, non-deinterlaced. Then feed it to Toast 7.
Also when you import iMovie project's /Cache/Timeline Movie.mov reference movie to iMovie project: by default the input is deinterlaced. So to preserve all quality you must tweak the Timeline Movie.mov's quality settings and uncheck the Deinterlace options.
Many other apps behave the same so watch out!!
That applies to .mov files, usually .dv files' playback quality doesn't matter when they are used as an input.
BTW, .dv files' playback quality is deinterlaced low quality by default. Also note that that it isn't possible to save the high quality flag to the .dv file's data-fork, so you can a) save as... as a .mov file. Or b) save the HQ info in the .dv file's resource fork (MPEG Streamclip and Toast use this trick in .dv files).
Also remember that to verify what quality flag the .dv file really has, you must disable the QT Player's "Use high-quality video setting when available" -- otherwise the HQ flag is always checked eventhough it isn't really saved into the file!
So, in summary: you should always run a test with your workflow to verify how each app handles the quality setting of the input file!! If you don't, prepare yourself for unexpected deinterlaced output or bad quality output.
This is why I have a few interlaced test .dv clips on my HD so I readily see how each app handles them. I'm very familiar with each frame so I can quickly spot any unexpected bad quality from the output (due to unexpected deinterlacing, wrong field dominance, scaling artifacts etc). Those issues are surprisingly common, but sometimes they aren't readily recognized unless searched for.

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Recently I'm trying to transcode a DVD into H.264 with x264. All the VOB files are dumped already.
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------------------------------------------------------------------------------------------+
I'm not familiar with mencoder's options, though it seems to be able to drop the extra frame with "-vf pullup,softskip -ofs 24000/1001", but I can't find a way to let mencoder output as yuv4mpeg. Also there is a reason why I tend to avoid using mencoder:
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http://omploader.org/vMjE3Zw
The original (mplayer VTS_01_1.VOB)::
http://omploader.org/vMjE3aA
Maybe it's just my build of mencoder(compiled at home)... But with this I really can't say mencoder is to be trusted.
...Or, is it something wrong in my command?
-------------------------------------------------------------------------------------------+
By the way, for this specific DVD, I believe mplayer plus x264 together can achieve the best result; on the other hand, just as the title suggests, I'd like to find some decent tool to do IVTC and Deinterlacing. CLI preferred but good GUI apps are also welcome
Thanks in advance!
Last edited by lolilolicon (2009-07-25 03:31:59)

skottish wrote:You should be able to use the -vf pullup,softskip stuff still.
man mplayer wrote:Softskip
Only useful with MEncoder. Softskip moves the frame skipping (dropping) step of encoding from before the filter chain to some point during the filter chain. This allows filters which need to see all frames (inverse telecine, temporal denoising, etc.)
Actually, when I tried::
mplayer -vf pullup,softskip VTS_01_1.VOB -noconfig all
The result is the same as just using "-vf pullup". The extra frame can't be dropped by mplayer this way......
Too bad many "convenient" tools like h264enc all use mencoder. I don't know whether handbrake does too. Haven't tried it out.
Avisynth is a great tool but works only for windows. x264's built in deinterlaced mode does no good in my case. ffmpeg's filters are still too limited by far. What can I do? Is there anything that does nothing but good IVTC?
-------------------------------------------------------------------------------------+
Klepper wrote:It says to always use the softskip filter together with pullup
man mplayer wrote:Always follow pullup with the softskip filter when encoding to ensure that pullup is able to see each frame.
In my case, pullup seems to work better than filmdint: I've just tried the h264enc script which is almost totally a frontend to mencoder. Look at the mencoder filters it used:
mencoder VTS_01_1.VOB -o 01.avi -fps 30000/1001 -ofps 24000/1001 -vf filmdint=fast=0/io=30:24/dint_thres=256,softskip,harddup -oac pcm -ovc x264 -x264encopts <x264OPTIONS>
See, it also used filmdint as you suggust. The result is not too bad: removed the extra frame and plays at 24fps. But I can still notice interlacing occasionally. Maybe it's because the video isn't constant pattern "PPPII" but with some shifting (say, PPPIIPPPII...PPPIIPIIPPPIIPPPII, I found some pattern like this in the source VOB)
Man page says "io=<ifps>:<ofps>" must match "-fps/-ofps" ("-fps 30000/1001" and "-ofps 24000/1001" in my case.)
Since -ofps is an option ONLY for mencoder, but not for mplayer, filmdint can't make mplayer drop the extra frame like mencoder.
I played the VOB with "mplayer -vf filmdint=fast=0/io=30:24 VTS_01_1.VOB -noconfig all" and there're lots of "@@@@@@@@ Bottom-first field??? @@@@@@@@" spitted out in the console. I read about this in the man page but don't understand....
If the source is MPEG-2, [u]this must be the first filter to allow access to the field-flags set by the MPEG-2 decoder[/u]. Depending on the source MPEG, you may be fine ignoring this advice, as long as you do not see lots of "Bottom-first field" warnings.
I don't have any other filters in the command line, so... why?
The occasional interlacing is the same as the video encoded with h264enc. Also, it did not drop the extra frame anyway.
-------------------------------------------------------------------------------------+
Also I have a doubt:
In my first post, I wrote:
The original (mplayer VTS_01_1.VOB)::
http://omploader.org/vMjE3aA
But I think even this is not "original" -- not as good as the original video before it was telecined into NTSC format. I think it's mplayer not doing it good enough. The real original frame should have no blocking......
I've compared it to one fansub rip, the same frame looks better than in the image above, very little blocking, also the bass string isn't blurred like in the image above:
http://omploader.org/vMjE5aw
I don't know how they did it. And I actually want to do it better
Last edited by lolilolicon (2009-07-25 09:32:30)

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