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@gentoo.org mailing list
