All posts tagged: encoding

420 vs 422 subsampling

The mysteries of bit depth and chroma subsampling

Colour depth or bit depth is either the number of bits used to define the colour of a single pixel in a bitmapped image or video frame buffer, or the number of bits used for each colour component of a single pixel. Chroma subsampling is the practice of encoding images by delivering a lower resolution for chroma (colour) information than for luma (lightness). The two combine into what your footage looks like when it has been freshly recorded.

atomos AtomFLEX 4K60p HDMI cable

Why ProRes video encoding in post is inferior to ProRes recording

Shooting in ProRes or DNxHD has several benefits if you’re working with Final Cut Pro X or Avid Media Composer. Of course you can always encode or transcode from a different codec to either of these in post-production, but that costs time — which may be valuable. There may be other reasons why you don’t want to wait until post, as I found out. I spent three days experimenting with a GoPro HERO4, four encoding apps for the Mac, the Final Cut Pro X timeline and an Atomos Ninja Assassin. Thanks to the newest version of Telestream’s Switch QC app, I came across some strange results that I didn’t know about before, and which changed my views on post-production video encoding versus shooting straight to ProRes with a Ninja monitor/recorder.

Squeeze 11 interface

Squeeze Desktop 11 Pro improves codecs, 64-bit 4K support and high-bit dithering

The new version of Sorenson Media’s Squeeze has new features and improved codecs. It also allows you to output footage at higher frame rates than the source clips you’re importing. However, and just like any other transcoding app currently available, there’s no support for creating footage from DNG files such as the ones your Blackmagic Design camera will output. The best news of the day is that Squeeze Desktop 11 does create movies from still images and is again a bit faster than its predecessor.

video scopes within scopebox

ScopeBox serves parades, histograms and video scopes to your NLE or compositing app

ScopeBox displays video scopes, regardless of whether your clip is processed with EditReady — before you transcode them — or Final Cut Pro X, Premiere Pro and other apps. It does so via ScopeLink, a clever system that allows ScopeBox to integrate with a slew of supported applications, including SpeedGrade, various versions of After Effects, Prelude and Pomfort Silverstack. In addition, ScopeBox provides scopes for live sources such as BlackMagic Design and Aja input equipment, and for movie clips stored on your disk(s).

editready and scopebox

Who’s the fastest and best encoder in the land?

It’s been a while since EditReady was first released. Since then I’ve only used Squeeze and Episode. I have them on my machine and they’re industrial workhorses so why would I choose something else? Speed could be a significant factor and quality of output of course. I decided to try them all with a GoPro HERO4 UHD clip and the results sort of surprised me.

Why you need Episode 7 for video encoding: because it has all you need

Transcoding app Episode 7 has been released a couple of weeks ago. I’ve been testing it with a large number of various clips and it’s faster, can now handle 4K footage and supports a larger number of formats, including DNxHD, DNxHR, DVCPro HD and JPEG2000. Naming a storage device was previously only possible via the Command Line Interface. In Episode 7 you can do this through the GUI as well. Finally, you can now map audio channels in one area of the UI.

Episode 6.5

Telestream upgrades Episode 6.5, adds HEVC, VP9 and multi-track audio

Telestream has upgraded Episode, their transcoding application, to version 6.5. The upgrade includes support for formats such as HEVC, XAVC, VP9 and MXF AS-11, caption insertion with encoding and pass-through of formats such as MCC, SCC and CEA-608/708, multi-bitrate streaming support, support for multi-track audio, and image sequence support directly from the GUI. Some jobs using the new codecs turned out to be too memory intensive and crashed.