[Theora-dev] New addition to FAQ

[David Kuehling]

<20040630234503.GA23361 at ebed.etf.cuni.cz>
<200407011305.01146.Chilling_Silence at orcon.net.nz>
Message-ID: <87d63gktmp.fsf at snail.Pool>

>>>>> "Chilling" == Chilling Silence <Chilling_Silence at orcon.net.nz> writes:

> On Thursday 01 July 2004 11:45, you wrote:
>> I have Q, but no A yet:
>>
>> How do I encode DVD to theora without storing huge raw files on the
>> disk?

> In a nutshell: AFAIK - You cant!

Using mplayer, you can.  The following code only needs temporary storage
for the audio.  Actually you could get around the temporary storage by
using another mplayer-process in a pipe for audio.  However, for DVDs
this is utterly slow and sometimes hangs on my system.  You can
optimized more, by storing only the compressed MP2-audio on disk and
using another mplayer-decoding pipe when creating the .ogg.  The
following script I'm currently using for encoding a the Chihiro DVD
(encoding not completed yet...):

#! /bin/sh

rm stream.yuv
mkfifo stream.yuv

if ! test -f audiodump.wav; then
mplayer dvd://1 -alang ja -ao pcm -vc dummyxy -vo null -cache 8192
fi

mplayer -cache 8192 -vo yuv4mpeg -benchmark -nosound \
-vop expand=480:352:0:0:0,scale=480:288:0:0:40,crop=640:512,pp=lb/dr \
-spuaa 4 -slang de -spugauss 0.5 -spualign 1 -sws 7 \
dvd://1 &> /dev/null &

encoder_example -a 2 -v 7 audiodump.wav stream.yuv > theora.ogg

David
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