Re: [gentoo-user] mencoder did nothing all night at 100% CPU!

[Nick Rout]

If you want to encode to dvd format I highly recommend any2vob or its
cousin any2dvd

Not in portage AFAIK, but the author provides ebuilds. 

There is a long thread on forums.gentoo.org about any2vob. Here is the
web page for the script:

http://sourceforge.net/projects/any2dvd/

http://forums.gentoo.org/viewtopic-t-117709-highlight-any2vob.html




On Fri, 11 Aug 2006 07:36:32 +0930
Iain Buchanan wrote:

> Hi all,
>
> I'm trying out mencoder to try a few different codecs and formats for 1.
> dvd authoring and 2. just compressing to keep on my HD.
>
> This is what I tried last night:
>
> mencoder 2006.06.24_09-26-48.dv -o 2006.06.24_09-26-48.avi -ovc lavc -oac lavc
>
> that was ok, GREAT file size (original 350MB dv went down to 13MB), but
> crappy quality - I could see all the compression "squares".  Then I
> tried:
>
> mencoder 2006.06.24_09-26-48.dv -o 2006.06.24_09-26-48.avi -ovc lavc -lavcopts vcodec=mpeg4:mbd=2:mv0:trell:v4mv:cbp:last_pred=3:predia=2:dia=2:vmax_b_frames=2:vb_strategy=1:precmp=2:cmp=2:subcmp=2:preme=2:qns=2 -oac lavc
>
> which was better quality, and still a great file size, but I could still
> see some quit noticeable compression artifacts.
>
> THEN I thought, well if I'm going to encode for DVD, lets try:
>
> $ mencoder 2006.06.24_09-26-48.dv -of mpeg -ovc lavc -lavcopts vcodec=mpeg2video -oac pcm -o 2006.06.24_09-26-48.mpeg
>
> which went straight to 100% CPU.  I then went to bed, and when I got up
> in the morning 7 1/2 hours later, it was in the same spot at 100% cpu!
> The file size was 0 bytes.  Heres the output:
>
> $ mencoder 2006.06.24_09-26-48.dv -of mpeg -ovc lavc -lavcopts
> vcodec=mpeg2video -oac pcm -o 2006.06.24_09-26-48.mpeg
> MEncoder 1.0pre8-3.4.6 (C) 2000-2006 MPlayer Team
> CPU:               Intel(R) Pentium(R) 4 CPU 3.00GHz (Family: 15, Model:
> 2, Stepping: 9)
> MMX supported but disabled
> MMX2 supported but disabled
> CPUflags: Type: 15 MMX: 0 MMX2: 0 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
> Compiled with runtime CPU detection.
> 93 audio & 211 video codecs
> success: format: 0  data: 0x0 - 0x15fd6500
> RAWDV file format detected.
> VIDEO:  [DVSD]  720x576  24bpp  25.000 fps    0.0 kbps ( 0.0 kbyte/s)
> [V] filefmt:22  fourcc:0x44535644  size:720x576  fps:25.00
> ftime:=0.0400
> ==========================================================================
> Opening audio decoder: [libdv] Raw DV Audio Decoder
> AUDIO: 32000 Hz, 2 ch, s16le, 28800.0 kbit/2812.50% (ratio:
> 3600000->128000)
> Selected audio codec: [libdv] afm: libdv (raw DV audio decoder (libdv))
> ==========================================================================
> PACKET SIZE: 2048 bytes, deltascr: 245760
> Opening video filter: [expand osd=1]
> Expand: -1 x -1, -1 ; -1, osd: 1, aspect: 0.000000, round: 1
> ==========================================================================
> Opening video decoder: [dshow] DirectShow video codecs
> Decoder supports the following YUV formats: YUY2 UYVY
> Decoder is capable of YUV output (flags 0x9)
> VDec: vo config request - 720 x 576 (preferred colorspace: Packed YUY2)
> [PP] Using codec's postprocessing, max q = 4.
> Could not find matching colorspace - retrying with -vf scale...
> Opening video filter: [scale]
> VDec: using Packed YUY2 as output csp (no 0)
> Movie-Aspect is undefined - no prescaling applied.
>
> SwScaler: BICUBIC scaler, from Packed YUY2 to Planar YV12 using C
> videocodec: libavcodec (720x576 fourcc=3267706d [mpg2])
> Selected video codec: [qdv] vfm: dshow (Sony Digital Video (DV))
> ==========================================================================
> Limiting audio preload to 0.4s.
> Increasing audio density to 4.
> Writing header...
> Killed
>
> (I killed it :)  So, firstly, why didn't that work?
>
> And secondly, how should I encode if I want to write the movie to a DVD,
> and have really good quality (close to the original dv)?
>
> Lastly, how about storing on disk - what codec should I use there?  As I
> said, I didn't like the quality of the first two attempts, so something
> a bit nicer, (at the expense of file size) would be good.
>
>
> Well, there are some big asks in this email - I appreciate anyone
> looking into it and offering tips.  Thanks!
>
> (PS I've been reading:
> http://gentoo-wiki.com/HOWTO_Mencoder_Introduction_Guide
> http://www.mplayerhq.hu/DOCS/HTML/en/menc-feat-dvd-mpeg4.html#menc-feat-dvd-mpeg4-muxing-avi-limitations
> http://www.mplayerhq.hu/DOCS/HTML/en/menc-feat-enc-libavcodec.html
> http://www.mplayerhq.hu/DOCS/HTML/en/menc-feat-mpeg.html
> thanks.)
> --
> Iain Buchanan <iaindb at netspace dot net dot au>
>
> Four fifths of the perjury in the world is expended on tombstones, women
> and competitors.
> 		-- Lord Thomas Dewar
>
> --
> gentoo-user@g.o mailing list

-- 
Nick Rout <nick@×××××××.nz>

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