Which video has the higher quality?

[Jay123210599]

I have two scenarios based on this question:

1. A deinterlaced video with the original frame rate vs a deinterlaced video with twice the original frame rate.
   
2. A 480p video or lower upscaled into a 1080p video vs a 1080i video deinterlaced into a 1080p video.

[Bwaak]

Depends on the effective rate of the program.

Don't you have at least four scenarios here?

[poisondeathray]

I have two scenarios based on this question:

1. A deinterlaced video with the original frame rate vs a deinterlaced video with twice the original frame rate.
   
2. A 480p video or lower upscaled into a 1080p video vs a 1080i video deinterlaced into a 1080p video.

It depends on other factors as well -

The bitrate and encoder type and settings used

The deinterlacing algorithm used

The upscaling algorithm used

and how you are defining "quality"

[davexnet]

In addition to the above, double rate deinterlacing maintains the full motion fluidity of the interlaced file.
Many things to consider ...

[Jay123210599]

All right, I use QTGMC for deinterlacing and Topaz Video AI for upscaling. What's the answer now?

[davexnet]

You deinterlace with qtgmc and then upscale the result with Topaz?
Can you post some samples?

[poisondeathray]

I have two scenarios based on this question:

1. A deinterlaced video with the original frame rate vs a deinterlaced video with twice the original frame rate.
   
2. A 480p video or lower upscaled into a 1080p video vs a 1080i video deinterlaced into a 1080p video.

1) One way of thinking of it is single rate deinterlaced, original framerate means you discard 50% of the information . So at maximum it's half "quality" by one definition, since you only have half the temporal samples . That doesn't necessarily indicate anything about the per field spatial quality (or per frame spatial quality)

At a given limited bitrate, the single rate deinterlaced file may have higher spatial quality, because it has 1/2 the frames. If you use adequate bitrate and encoder settings, then it's a non issue

2)Also depends on the "480p or lower " quality and "1080i" quality you are starting with .


This is assuming your 1080i are actually interlaced content. If it's progressive content you should be field matching