sporadic blinking in dark scenes, when using Levels effect

[Graham Bernard]

If your Preview is good I really doubt it’s the Levels FX. If it was, then we’d be swamped with similar issues from others, and we are not. Try rendering to an alternative Format to test. Plus we need more information on your Media and that Render Template used.

* Grazie

Video Content Creator and Potter
PC 7 64-bit 16gb * Intel® Core™i7-2600k Quad Core 3.40GHz * 2GB NVIDIA GEFORCE GTX 560 Ti
Cameras: Canon XF300 + PowerShot SX50HS Bridge

[Marius Dudu]

Hi Graham,

The thing is, if I disable Levels effect then everything is fine on rendered video. As I have mentioned, this issue occurs only on dark scenes, and using Levels I am trying to adjust a little bit let’s say the brightness and the noise because the video was shot at night.

Below are the properties of the video I am trying to edit:

Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42
File size : 481 MiB
Duration : 4mn 55s
Overall bit rate : 13.7 Mbps
Encoded date : UTC 2018-11-14 17:31:24
Tagged date : UTC 2018-11-14 17:31:24

Video
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.0
Format settings, CABAC : Yes
Format settings, ReFrames : 2 frames
Codec ID : avc1
Duration : 4mn 55s
Bit rate mode : Variable
Bit rate : 13.5 Mbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16/9
Frame rate mode : Constant
Frame rate : 29.970 fps
Resolution : 24 bits
Colorimetry : 4:2:0
Scan type : Progressive
Bits/(Pixel*Frame) : 0.218
Stream size : 477 MiB (99%)
Language : English
Encoded date : UTC 2018-11-14 17:31:24
Tagged date : UTC 2018-11-14 17:31:24

Audio
Format : AAC
Format/Info : Advanced Audio Codec
Format version : Version 4
Format profile : LC
Format settings, SBR : No
Codec ID : 40
Duration : 4mn 55s
Bit rate mode : Constant
Bit rate : 128 Kbps
Channel(s) : 2 channels
Channel positions : L R
Sampling rate : 48.0 KHz
Resolution : 16 bits
Stream size : 4.51 MiB (1%)
Language : English
Encoded date : UTC 2018-11-14 17:31:24
Tagged date : UTC 2018-11-14 17:31:24


The Render Template I am using is: Sony AVC/MVC 1920×1080-30p.

Thank you

[Graham Bernard]

Marius thanks for the info. Really helps

[Marius Dudu] “The Render Template I am using is: Sony AVC/MVC 1920×1080-30p.”

Try rendering to another template. It’s starting to sound you’ve got too low a bitrate. There’s a lot of maths going on with a Levels Correction.

Oh I meant to ask. Do you have another Media in your Project?

* Grazie

Video Content Creator and Potter
PC 7 64-bit 16gb * Intel® Core™i7-2600k Quad Core 3.40GHz * 2GB NVIDIA GEFORCE GTX 560 Ti
Cameras: Canon XF300 + PowerShot SX50HS Bridge

[Marius Dudu]

Yes, I do have multiple Media in the Project, but all are from the same source (smartphone).
From experience and several testing, I learned that this template gives the best quality for mp4: Sony AVC/MVC 1920×1080-30p