Importance of Key Frame Interval in live streaming

Question

What is the significance of Key frame interval in live streaming. In VOD I know that media players seeks between these keyframes but what is use of it in live streaming. Any effect on quality ?
Please help
-Prem

Answer 1

Sorry the recommendations didn't work. I tested two 1080p files – one 23.98 fps and a 29.97 fps – at those settings. No loss of sync whatsoever here.
So perhaps there is something about your source file that's a problem. Try another file and see.
On a different, but related topic, the MPEG4 encoding that Compressor 3.5 uses is kind of long in the tooth. You'll note in the user manual that all the discussion about features and settings seems to presume that the file will not be re-encoded. (Hence, my question about whether it was for your own Web Site.)
All the video services take whatever we upload and re-encode them to their proprietary specs. So generally it's best to upload as much info as possible. (David Brewer, who frequently contributes to these boards, uploads very large Pro Res files with good results.)
YT's advanced encoding guidelines recommend the MP4 container, but with the h.264 codec. That is the Part 10 MPEG standard, which Compressor 3.0 and 3.5 cannot do. (However, Compressor 4.0 can do that encode, which is one of benefits of having that version.)
FWIW, all videos that I prepare for the Web are h.264 .mov files (not mp4) and I've not had any quality issues with video or audio. Just personal preference.
Perhaps someone else will have some ideas why you lose sync other than sample rate and/or change in frame rate.
Good luck.
Russ