After more than seven years as a Senior Staff engineer at Periscope and Twitter, Geraint Davies is returning to freelance consulting.

Geraint has 40 years experience as a programmer, and was the architect and lead developer for DirectShow as well as the video engineer for Periscope and Twitter's live video. He has worked for 20 years as a freelance developer, developing solutions and advising on video and audio software. Previous clients include Periscope, Microsoft, VBrick, Philips Semiconductors, Mediamatics, Broadcom, Intel and the BBC.

Contact Geraint at

GDCL: 1996-2015 and 2022-present

Documents on DirectShow

22 Apr 2014
Frame Re-ordering Support in iOS Video Encoding
21 Jan 2014
Video Encoding on iOS 7
12 Nov 2013
DirectShow RTSP filter and Port Settings
29 Sep 2013
Decline and Competition
16 May 2013
DirectShow RTSP Server filter and RTSP Jukebox