Tuesday, May 06, 2008
T H & B closing performances
a brief document of the closing performances of T H & B, May 3, 2008
performers, in order of appearance:
Tor Lukasik-Foss
Lesley Loksi Chan
Reinhard Reitzenstein & Gayle Young
Dave Hind
handheld camera, ambient sound and lighting
P + C = qzh, Throwaway Digital, 2008
Subscribe to:
Post Comments (Atom)
4 comments:
video skips, especially around 1:50, are due to Google Video
note: once again, video on Google lets me down in the audio sync department. fix coming soon.
q x
after some research on Google Video:
Using an mp4 capable tool (mp4box) I gathered some detailed info about
this video file. I find that the video and audio streams are listed as
having different durations. The video is 00:53:13.633 and the audio is
00:53:10.398, a difference of over 3 seconds, which is most visible
near the end of the file. I also gathered the video framerate, which
is listed as being 29.969 frames per second.
Okay, now for a bit of math... If you divide the duration of the video
stream (00:53:13.633) by the duration of the audio stream
(00:53:10.398) you get a ratio of about 1.001014, which is how much
longer the video is from the audio. If you multiply this ratio
(1.001014) by the listed framerate of 29.969 you get 29.999388, which
is very close to an even 30 frames per second (fps).
Technically speaking, it seems to me that the problem with these
downloadable Google video files is that the video and audio streams
are being encoded and/or listed at two different framerates -- one at
30 fps and the other at 29.969 fps, and so the video and audio are not
being played at the same rate, leaving them out of sync.
I hope someone from Google is aware of this, so these videos can be
corrected. This problem is still happening on recently released
videos!
In the meantime I'm hoping to find a method or tool that lets me
directly edit the video framerate on these files, so that I don't have to screw around with demuxing or reencoding and such.
---end of post
q x
fixed.
q x
Really interesting performances - thanks for the capture!
Post a Comment