I have my own blog post about it, so it would be helpful to read it. QTKit, QTStringTime() and SMPTE http://jongampark.wordpress.com/2008/10/27/qttime-qtstringtime-and-smpte/ https://jongampark.wordpress.com/2011/08/25/quicktime%EC%97%90%EC%84%9C-time... This is a kind of side information for DV video case. Timecode QuickTime returns vs. Correct timecode for DF video https://jongampark.wordpress.com/2009/12/28/timecode-quicktime-returns-vs-co... If it doesn't help you, let me know. Thank you. JongAm Park _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/pro-apps-dev/site_archiver%40lists.a... This email sent to site_archiver@lists.apple.com Hello.. Apple has a documentation on the issue in their developer.apple.com, but problem is that they tried to do so verbally ( although verbal the content can be mathematical ) what the QuickTime time code mean is quite blurry. More complete explanation is done here, but I'm sorry that I wrote it in Korean. However, I put some excerpt from Apple's own document in my own post. So, I believe you can figure it out. I wrote it in Korean and would have written in English also, but I decided not to because I believe most English-speaking people would have some more source to figure those out. QuickTime에서 TimeScale은 정확하게 무엇일까? ( What is TimeScale exactly in QuickTime? )