update 5: 17/feb: WebKit works 100% accurate now! Congratulations! Also in the news: Microsoft has been in contact, adding IE9 compatible video (add it to the video selection menu)
update 4: 3/feb: Added new synthesized test video (H264, Webm and Ogv), WebKit is working on a fix. IE9 confirmed to have this bug as well (IE9 Public Feedback Program #636755 "Frame accurate seeking isn't always accurate")
update 3: Firefox is aiming to get it fixed for V4 too.
update 2: Seems to work fine in latest FF4 nightly (Firefox/4.0b10pre 2011-01-18)
update 1: 19/jan: Chromium is per r71676 the first browser to be 100% SMPTE timecode & frame accurate! Congrats
burned-in timecode should match the calculated timecode
Video info: currentTime: 0 fixedTimecode: 0 srcVideo: http://www.massive-interactive.nl/html5_video/video/perfect-timecoded.webm