Magic Lantern Forum

Using Magic Lantern => Raw Video => Raw Video Postprocessing => Topic started by: cpc on March 28, 2014, 12:31:22 AM

Title: Lossless compression for DNG video (with DNG Converter and DNGStrip)
Post by: cpc on March 28, 2014, 12:31:22 AM
Most of you are probably familiar with losslessly compressing DNG raw video with DNG Converter. The compressed DNG sequences work fine in both Resolve and ACR.
I've written a small tool (DNGStrip) to strip these of useless stuff which is unconditionally added by DNGConverter to each frame: a thumbnail and some pointless tags. Mac and Windows versions, free to use. Pretty fast. Download link in this article: Lossless compression for DNG raw video + introducing DNGStrip (http://www.shutterangle.com/2014/lossless-compression-for-dng-raw-video-dngstrip/). The text also gives more context on the whole process.

In short, compressed 16:9 frames will lose 114kb per frame, compressed 2:1 frames will lose 102kb per frame after going  through DNGStrip. Test footage (2:1 1920x960 Canon 5dm3 raw) was reduced from 710gb to 399gb with DNG Converter and then further down to 377gb with DNGStrip. That's 53.1% of the original size for full original image quality and average bitrate only 317 mbps. Not bad, methinks.
Title: Re: Lossless compression for DNG video (with DNG Converter and DNGStrip)
Post by: Milk and Coffee on August 22, 2023, 07:58:14 PM
This looks amazing! Any discounts for the magic lantern family?
Title: Re: Lossless compression for DNG video (with DNG Converter and DNGStrip)
Post by: Walter Schulz on August 22, 2023, 08:10:55 PM
Account info cpc: Last Active: July 17, 2020, 01:28:23 AM