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compressing mpeg2 5 times with acceptable quality
Forum Index -> Video -> Linux Printer-friendly version
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lagu2653
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Joined: 01 Nov 2005
Location: Sweden
Post Posted: Dec 23, 2005 17:13 Posts Comp View users profile Send private message Reply with quote
I want to migrate my VHS collection to DVD5. I have a Hauppauge PVR 350 card in my SuSE PC. I can capture video through a regular cat-command (cat /dev/video0 > /mnt/hdb1/TV/recordings/tmp.mpg). But the file is app. 5 times too large. How can I shrink it 5 times in order to be able to fit 8 hours of VHS-video onto a 4.37 GB DVD5 without too much loss of video- and audio-quality? I want to be able to play the video-files (mpeg, avi, divx, xvid... which ever format offers the best quality at a 5:1 compression ratio) both on Linux and Windows.
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SuSE 9.3 Pro

lumis
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Joined: 18 Jan 2005
Location: the remnants of pangea
Post Posted: Jan 01, 2006 01:47 Posts Comp View users profile Send private message Reply with quote
expecting good quality at 8 hours on a dvd5 is asking too much..

you should probably shoot for 3 dvd's, maybe even 4.. 2 would be stretching it quite a bit..
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disturbed1
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Joined: 22 Apr 2001
Location: init 4
Post Posted: Jan 01, 2006 06:13 Posts Comp View users profile Send private message Reply with quote
Xvid would be your best option for 8 hours -> 4.35GB, but even that's a stretch. 4 hours per DVD in Xvid would be ideal.

hkl8324
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Joined: 09 Dec 2005
Location: Hong Kong
Post Posted: Jan 25, 2006 01:17 Posts Comp View users profile Send private message Reply with quote
Use H.264 with 1Mb/s

It is more than enough for VHS quality video...

redtux
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Joined: 21 Dec 2006
Location: United Kingdom
Post Posted: Dec 21, 2006 09:50 Posts Comp View users profile Send private message Reply with quote
I can get around 4-5 hours as DVD format (not avi/divx) that should play on (nearly) any dvd

try this command
ffmpeg -i inputfile -target dvd -qscale 3 -acodec mp2 -ac 2 ab 224k -ar 44100 outputfile

wzrlpy
Member


Joined: 03 Dec 2006
Location: Europe
Post Posted: Dec 26, 2006 05:11 Posts Comp View users profile Send private message Reply with quote
Hi,

The previous command will work better using 48KHz audio (standard for DVD) instead of 44.1KHz (standard for SVCD):

Code:
ffmpeg -i inputfile -target dvd -acodec mp2 -ac 2 -ab 224k -ar 48000 outputfile


Also since your source is VHS, you may consider using less resolution (Half-D1: PAL 352 x 576 or NTSC 352x480):

Code:
ffmpeg -i inputfile -target dvd-pal -s 352x576 -size -acodec mp2 -ac 2 -ab 224k -ar 48000 outputfile


Code:
ffmpeg -i inputfile -target dvd-ntsc -s 352x480 -size -acodec mp2 -ac 2 -ab 224k -ar 48000 outputfile


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