Re: MPEG playback time
- From: "Ken Maltby" <kmaltby@xxxxxxxxxxxxx>
- Date: Mon, 1 Oct 2007 23:39:04 -0500
"yaugin" <yaugin@xxxxxxxxx> wrote in message
news:1191290405.116896.308280@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
I have two videos, containing principally the same content (casual
viewing reveals no differences). When loaded in GSpot, everything is
the same except file size: 160,125 kb vs 160,269 kb and "Sys bitrate":
one is 615, the other 594. In both cases the duration reported is
35:00.18.
However, when I load these into Media Player Classic, one file is
35:00 and the other is 36:51, a relatively large difference. I played
the videos side-by-side, and could not determine if there was any
cutting or other anomalies in either video, but over time it did
appear that the shorter video was advancing faster than the other.
In VLC, the longer video is reported as having a playtime of only
1:00, but it continues to play the video correctly. VirtualDub reports
"anachronistic or discontinuous timestamps" in both files, but with
the longer file having more.
Overall it appears as though the smaller file is more correct, but I'm
curious as to the nature of the problem. What's especially curious to
me is that the videos actually playback at different speeds in MPC. Is
this a quirk of MPC, revealing that its timer is actually based on
progress rather than elapsed time, or is it a result of the "Sys
bitrate", which I thought was just dummy info in the mpeg header?
One of the great strengths of MPC, is that it uses the
DirectShow filters to play the media. Since you say
the files you are playing are the same; the same filters
should have been used to play both files. You can
gather a great deal more information by comparing
the property pages for the filters (including the properties
shown for the file under the Filter dropdown listing.)
Examining these may provide an answer. Load your
video then hit space to pause the playback. Right click
on MPC then mouseover "Filters". You will now have
a listing of the filters used and, at the bottom of the list,
the file. When you mouseover the file listing you will
have another dropdown with "Properties" at the top,
click on that. With this and what you can get from
clicking on the other filters listed, you can have a lot
of information to compare.
Luck;
Ken
.
- References:
- MPEG playback time
- From: yaugin
- MPEG playback time
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