[haiku-bugs] Re: [Haiku] #6512: More MediaConverter features
- From: "pulkomandy" <trac@xxxxxxxxxxxx>
- Date: Tue, 23 Dec 2014 15:20:40 -0000
#6512: More MediaConverter features
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Reporter: forart.eu | Owner: nobody
Type: enhancement | Status: closed
Priority: normal | Milestone: R1
Component: Applications/MediaConverter | Version:
Resolution: invalid | Keywords: MediaConverter
Blocked By: | Blocking:
Has a Patch: 0 | Platform: All
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Comment (by pulkomandy):
http://msdn.microsoft.com/en-
us/library/windows/desktop/dd743814(v=vs.85).aspx explains what 2-pass
encoding is. It's not "going through the entire video twice". It's
splitting the work in two passes which do different things. The first one
collects data, and in the second one the actual encoding happens, using
information collected in the first pass.
This allows the encoder to make better decisions, like compressing some
parts of the video more because it knows that at a later point there is a
less easily compressed part, which needs more bandwidth to keep a roughly
identical quality.
This is used mostly when you want to encode a file with a fixed final
size, and want the encoder to adjust the bitrates dynamically (VBR) so it
doesn't waste space on parts of the video that don't really need it, and
then overcompresses other parts to compensate.
Since MediaConverter does not allow to set a target file size or even
bitrate, there is no use for this. It is still a great 3rd party
opportunity for a more complete app.
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Ticket URL: <https://dev.haiku-os.org/ticket/6512#comment:6>
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