VideoReDo Deinterlacing

criggs

Member
I've got this MP4 file that has pronounced interlacing artifacts. I'm trying to de-interlace it, and getting nowhere fast. I've tried Auto, Bob, Weave and Smart but it won't go away.

As for rendering, I picked H.264, CRF encoding value 23.

At this point, I'm stumped. Am I doing something wrong? Any ideas? Thanks!

Here are the stats for the source file:

File: Name : C:\Users\chrig_000\Videos\MusicVideo.mp4
Size : 0.130 GB
Duration : 00:02:57.14
Mux type : MP4
Video: Encoding : H.264
VideoStreamID : x201
Frame rate : 29.97 fps
Frame rate flag : Constant
Encoding size : 1920 x 1080
Aspect ratio : 16:9
Header bit rate : 135.000 Mbps
VBV buffer : 2470 KBytes
Profile : Main/5.0
Progressive : Progressive
Chroma : 4:2:0
Entropy mode : CABAC
Bit rate : 5.644 Mbps
Captioning : None found
Audio Stream: 1 (Primary) Codec : AAC
Format : RAW
Channels : 2.0
Language : und
PID : x202
PES Stream Id : xC0
Sampling rate : 48000
Sample size : 16 bits
 

jmc

Active member
They are working on deinterlacing problems as we speak and it will be much better with "3:2 PullDown" MPGs.
But I have not worked with interlaced H264.MP4s.

There is one thing I've noticed...
My tv deinterlaces so I don't see any problem with the Big Bang tv series while watching the show.
BUT a commercial for that same show will show interlacing issues on my tv.

I can only guess that the commercial was recorded on some system that did not deinterlace so the horrible interlacing artifacts are recorded right into the video itself. Don't think there is any way to fix that.

Would love to know why anyone would produce an interlaced video file in this day and age! They are horrible.
 

Danr

Administrator
Staff member
What may be happening is that the file is interlaced, but marked as progressive. If the file itself is marked as progressive or if the individual frames are marked as progressive then deinterlacing is NOT performed regardless of the output profile setting. You can try and fix things by recoding twice.

1. Transcode, with the deinterlacer to "force interlace". This will recode the file and mark the frames as interlaced. The video itself (other than recoding) won't be touched.

2. Transcode again with the interlacer enabled. This will run each frame through the deinterlacer and hopefully fix the problem.
 

musicvid

Member
If you have an MP4 that shows interlacing artifacts, it is almost certainly a 2nd or 3rd generation frankenfile, in which the misprocessing errors are already baked in, and unrecoverable. A couple of these come across my desk every week, the most recent was yesterday.
 
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