Inspiring

Question

Transcoding to Cineform seems to reduce quality

Forum|Forum|7 years ago
July 24, 2018
3 replies
2030 views

If I maximize the preview window in premiere of the program window to 400 percent and have the transcoded clip above the native .mp4 clip the cineform clip is actually slightly reduced. Like the hand of someone will be more blurry than the native clip. I can notice this by using pressing the eye viewer button to bounce back and forth between the two video tracks. Is this normal? I have transcoded a .mp4 native clip to Cineform quality 4 which is filmscan21and it's slightly blurry if you zoom in at 400 percent compared the native clip. If I transcode to cineform 5 which is the highest quality and maximum setting it does not cause any form of blur.

Is this supposed to happen? If Cineform retains quality why would it be slightly reduced after transcoding?

my .mp4 native clips are in 1080p HD and my cineform settings are 10 bit at quality 4

If it's normal for the clips to be slightly reduced then why would I ever want to transcode?

This topic has been closed for replies.

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excited_Genie16B8

Legend

My recommendation is to use Cineform proxies. They will make editing a LOT smoother, but the originals will be used for final export.

Work offline using proxy media |

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Offbeat Bryce ProductionsAuthor

Inspiring

good idea. I manged to just now create a SD cineform proxy that's really small files to put on a 1TB SSD

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Meg The Dog

Inspiring

Remember my first question to you:

Are you confident that when you did the transcode you did not alter the pixel dimensions, pixel aspect ratio, field dominance or add frame blending or other modification to the transcode?

MtD

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Meg The Dog

Inspiring

Are you confident that when you did the transcode you did not alter the pixel dimensions, pixel aspect ratio, field dominance or add frame blending or other modification to the transcode?

I just did a test from some Sony MXF footage to ProRes 422, and can't see any difference at 400% (the Pro Res is on the left, the original on the right:

MtD

O

Offbeat Bryce ProductionsAuthor

Inspiring

it's the same resolution. Double checked.

Here is a video screenshot of me going from the transcoded clip to native and you will see the minor detail differences as I switch back and forth. Particularly by the guys finger with his ring on it. The sharpness comes back when I turn off the top clip which is the cineform clip which is quality setting 4. ScreenCapture_2018-7-24 13.00.48.mp4 - Google Drive

If you look closely you will see that the pixels on the hand etc change when I flip back and forth from cineform to native

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Offbeat Bryce ProductionsAuthor

Inspiring

Please post the screenshots !!!!!!

Cineform Tree

native footage tree

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Byron Cortez

Community Expert

And how does the quality go 100%? That is the question you must answer. There is always some difference when you do a transcoding and you should always make comparisons to the actual size ie 100%. If being 100% looks very different from the original, that is a problem, but if 100% looks very good or equal quality, that is the result you are waiting for and it means that everything is fine.

Byron.

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Offbeat Bryce ProductionsAuthor

Inspiring

So Don't worry about what is looked like blown up above 100 percent?

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Byron Cortez

Community Expert

I would not worry if I transcoded, there are always internal coding changes when I go from one codec to another. 100% is the actual size of the video and everything that goes up from that value will begin to deteriorate even if it is the original video.

Byron.

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