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On Aug 11, 2006, at 03.13, Dizzy wrote:
Hi there
For years I have been using mencoder for reencoding existent DIVX
files but recently there are problems with this tool introduced by
changes in the features of the tool. I am trying now to switch to
using transcode for reencoding.
Basically, given a file, input.avi (say encoded in xvid/mp3) how can I
reencode it to a lower bit rate xvid/mp3 using transcode ?
Yes.
- -b b[,v[,q[,m]]] audio encoder bitrate kBits/s[,vbr[,quality
[,mode]]] [128,0,5,0]
(From the Transcode --help option)
- -w b[,k[,c]]
encoder bitrate[,keyframes[,crispness]] [(6000 for
MPEG 1/2,
1800 for others),250,100].
--video_max_bitrate b
Use b as maximal bitrate when encoding variable
bitrate MPEG-2
streams
(from the Transcode info page)
I have tried to determine this myself reading the provided
documentation. However I dont seem to be able to really understand
how to do it exactly, the examples found in transcode docs are for
other things. Like, how can I list all the options supported by a
module ? How can I list all the modules supported by -x or -y
Enter a module that doesn't exist, and check out the error. It should
tell you where the files are stored on your system, and then just
list the contents of that directory.
? How
can I list all the codecs supported by an encoding module ? Once
these are answered I can start playing with the various options.
In my specific example, I need the encoding to be done in 2 passes, to
encode the audio only once (thus either 3-pass encoding where the
first one just encodes the audio or 2 pass encoding where only the
second one encodes the audio too while the first one just copies it
form the original stream focusing only on the generation of the hints
file for the second pass video encoding) and to not have A/V
desynchronization problems because some frames in the movie might be
duplicated. I also usually used "high quality encoding" for the lavc
mencoder module, 4 motion vectors and trellis quantization, dont know
how to enable these with transcode.
Don't know how to do those things in Transcode, so you're kind of on
your own there.
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