Quantcast Deinterlacing already captured footage? - digitalFAQ Forum
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06-13-2020, 03:23 AM
retractOffer retractOffer is offline
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Hello,

I have captured my NTSC 8mm tapes as well as my VHS-C PAL tapes using virtualdub (Lagarith) and now I am trying to encode them to mp4 using avidemux.
I have analyzed the captured file and determined it to be interlaced because I can see the combing effect. In avidemux's x264 settings, there is the "Interlaced" checkbox that I am assuming I have to check because the source is interlaced. When I check the box and select TFF, the output seems sped up (not really sped up but it just looks that way) in VLC when its "Deinterlace" option is set to auto or on. However, when Deinterlace is set to off in VLC, it looks like the master copy (looks normal).
1) Why is this the case?

Also when the output MP4 file is displayed on TV (Sony A9G) it looks sped up just like on PC with VLC's Deinterlace option set to auto or on and there's no setting for toggling deinterlacing on the TV.
I was under the impression that I should not deinterlace just for the heck of it because modern TVs do deinterlace interlaced videos on the fly.
When I do not check the "Interlaced" option in avidemux, the output mp4 looks fine on PC with VLC's deinterlace option set to auto or off and looks jerky when set to on.

2) Doesn't not checking the "Interlaced" option in avidemux mean avidemux is going to deinterlace the video? It seems to do so because mediainfo reports "progressive" on the output but I can still see the combing effect on the end result. The output in terms of combing effect is the same as the one with "Interlaced" checked. What am I missing here?

3) Am I correct to say that for viewing on TV I shouldn't deinterlace?

4) If I wanna view on a PC, should I deinterlace or use on the fly deinterlace like the one in VLC?

5) If I need to deinterlace for the scenarios I explained, what is the best software (+instructions) to do so? I've read that QTGMC is very good, but I had trouble setting up avisynth on Windows 10.

6) Select TFF or BFF?

Attached are 10s samples of the master, interlaced checked, and interlaced not checked videos for reference.

Thanks


Attached Files
File Type: avi org.avi (84.79 MB, 7 downloads)
File Type: mp4 interlaced checked.mp4 (21.61 MB, 5 downloads)
File Type: mp4 interlaced not checked.mp4 (21.26 MB, 7 downloads)
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  #2  
06-13-2020, 11:22 PM
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Do not deinterlace in Avidemux.
Do not even encode in VLC. It's a player, the encoding is terrible.

VLC has all kinds of screwy issues, and I never use it for anything but casually watching videos. Never to check anything of important. The Yadif(x2) looks best for deinterlace, but on 2 of your clips it stutters. The other is buttery smooth 59.94fps.

H.264 handles interlace poorly on playback devices.
MPEG = interlaced
H264 = deinterlaced (QTGMC, use Hybrid to make it easy)

TFF vs. BFF is completely determined by the source. VHS via lossless will be TFF.

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06-14-2020, 12:27 AM
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Quote:
Originally Posted by lordsmurf View Post
Do not deinterlace in Avidemux.
Do not even encode in VLC. It's a player, the encoding is terrible.

VLC has all kinds of screwy issues, and I never use it for anything but casually watching videos. Never to check anything of important. The Yadif(x2) looks best for deinterlace, but on 2 of your clips it stutters. The other is buttery smooth 59.94fps.

H.264 handles interlace poorly on playback devices.
MPEG = interlaced
H264 = deinterlaced (QTGMC, use Hybrid to make it easy)

TFF vs. BFF is completely determined by the source. VHS via lossless will be TFF.
Appreciate your response. Could you address all my questions? Also which 2 clips are you referring to? I think you should've tried only on the original sample. The other two were derived from the original.
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06-14-2020, 12:43 AM
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Some of the question don't make much sense, other made moot by earlier post.

1. Why? I don't see what you see.
2. That setting just flags (or doesn't) the file. Interlace flagged as progressive is possible (and wrong).
3. It's about source, not viewing device.
4. "PC" (computer) viewed how? Local vs. online/streaming. Again, about source, not viewer.
5. QTGMC using Hybrid as the encoder.
6. Already answered.

VHS is interlaced, should be left that way, aside from something like Youtube uploading.

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06-22-2020, 12:25 AM
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Quote:
Originally Posted by lordsmurf View Post
VHS is interlaced, should be left that way, aside from something like Youtube uploading.
I need to compress to mp4 and upload to Google Photos (which is basically YouTube). So, you're saying I should deinterlace?

Also, is there a guide for setting up QTGMC on Windows 10?

-- merged --

I followed this tutorial to install QTGMC. Do you have a script available? I'm not sure how to proceed now.
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06-24-2020, 10:19 PM
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Quote:
Originally Posted by retractOffer View Post
I need to compress to mp4 and upload to Google Photos (which is basically YouTube). So, you're saying I should deinterlace?
Also, is there a guide for setting up QTGMC on Windows 10?
I followed this tutorial to install QTGMC. Do you have a script available? I'm not sure how to proceed now.
For merely deinterlacing and converting to H264 (MP4 wrapper), Avisynth scripting is a waste of time and energy.

Use Hybrid. http://www.selur.de/downloads

That's what I do. Easy.

Spend that time tweaking the encode settings for the H264 encoding. And use a good CRF mode, high teens or low 20s.

Deinterlace is a few switches (with Vapoursynth being better than Avisynth).

Save scripted QTGMC for more complex Avisynth needs.

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07-02-2020, 02:00 AM
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Quote:
Originally Posted by lordsmurf View Post
For merely deinterlacing and converting to H264 (MP4 wrapper), Avisynth scripting is a waste of time and energy.

Use Hybrid. http://www.selur.de/downloads

That's what I do. Easy.

Spend that time tweaking the encode settings for the H264 encoding. And use a good CRF mode, high teens or low 20s.

Deinterlace is a few switches (with Vapoursynth being better than Avisynth).

Save scripted QTGMC for more complex Avisynth needs.
Thanks. So yes to deinterlacing?

-- merged --

bump!
bump!
bump!
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  #8  
07-10-2020, 06:12 AM
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Quote:
I need to compress to mp4 and upload to Google Photos (which is basically YouTube). So, you're saying I should deinterlace?
Yes.
Yes.
Yes.

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Yesterday, 07:11 PM
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Quote:
Originally Posted by lordsmurf View Post
Yes.
Yes.
Yes.
Thanks. Regarding the Hybrid encoder:
1) which AVC Profile/Level should I select? High10, High4:2:2, High4:4:4 and the level 5:2, 5:1, 5:0, 4:2, ...
2) Deinterlacer Yadif custom or QTGMC(Vapoursynth) or something else?
3) Do I select even or odd?
4) Do I do anything to double the framerate? How? Does this affect the quality adversely?
4) I tried QTGMC(Vapoursynth) and I can still see the combing effect in the output file, albeit less. Is this expected? (played the output using virtualdub)



Thanks
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Yesterday, 07:41 PM
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You need to attach images to the forum, not hotlink Imgur (which breaks).

4:2:2 retains all color data.
Depends on use. Something like Youtube compresses to 4:2:0

QTGMC, never Yadif, when the choice exists.
Neither even or odd, but bob to get 59.94fps (NTSC) / 50fps (PAL)

I'd need a sample clip to process. But if this is lossless AVI source, you need to force deinterlace. Not auto.

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Yesterday, 09:20 PM
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Quote:
Originally Posted by lordsmurf View Post
You need to attach images to the forum, not hotlink Imgur (which breaks).

4:2:2 retains all color data.
Depends on use. Something like Youtube compresses to 4:2:0

QTGMC, never Yadif, when the choice exists.
Neither even or odd, but bob to get 59.94fps (NTSC) / 50fps (PAL)

I'd need a sample clip to process. But if this is lossless AVI source, you need to force deinterlace. Not auto.
Thanks, Sample is attached to the first post with title 'org.avi'.

1) 4:2:2 with what level?
2) when bob is selected, the footage becomes slow mo and sound is lost for the ~second half.
3) how does doubling the frame rate improve the quality? I mean if the source is 30 fps how does it becomes 60 fps?
4) please refer to question 4 in the previous post.

Picture attached.


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File Type: jpg Capture.jpg (50.1 KB, 2 downloads)
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