Martin
Guest
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 Posted:
Tue Nov 09, 2004 10:43 am Post subject:
Re: mux demux different sizes |
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"Irwin Feuerstein" <ebct@hotmail.com> wrote in message
news:542d2ca5.0411081525.56dffe39@posting.google.com...
| Quote: | Hi. Boy this video stuff is complicated. I have a 790 MB video file. I
was advised to demux and mux it with tMPGenc. When I am done demux and
muxing it it is 590 MB. Why? I did it twice, made sure that the
product was svcd mpg2 vbr, though curiously if I do it as vcd mpg1 it
is almost the same size. And avicodec says that it is indeed mpg2. I
don't get it.
Thanks,
IMF
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Maybe the original was padded.
The video stream can be padded with null data which brings the bitrate up to
a desired level.
A low bitrate video may be padded to ensure that the decoder receive enough
data to process/decode successfully.
When you encode VBR with TMPGEnc you'll see a setting in the MPEG Settings
under Rate Control Mode.
Here you can turn padding on or off when you encode a video.
So i'd guess that your original video had the stream padded with null data
so that it reached a minimum bitrate - and now that you've demuxed and
remuxed it, the video no longer has the extra padding.
Martin. |
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