[MEncoder-users] Re: mencoder blues

[Dev Gorur]

On 4/13/06, Guillaume POIRIER <poirierg at gmail.com> wrote:
>
> Hi,
>
> On 4/13/06, Dev Gorur <dgorur at gmail.com> wrote:
> > I've been having serious trouble with mencoder and am at the point where
> I
> > start dissing it to friends and colleagues. Initially, I was quite taken
> by
> > all the praise showered on it, and have spent many hours trying to get
> it to
> > do simple things like encode 20 jpegs into a movie that can be played by
> at
> > least one reasonably well-known movie player other than mplayer.
>
> I've put an example on on this part of the doc to encode to flash
> video format:
> http://www.mplayerhq.hu/DOCS/HTML/en/menc-feat-selecting-codec.html
>
> I don't remember if it works with pre7, so if it doesn't, use cvs.
>
>
> > Fair assumption: The majority of the world does not use mplayer to play
> > movies, and therefore the movies that mencoder makes need to be playable
> on
> > a reasonable range of other players. First I discovered the `trick' that
> > unless one forces the fourcc to DX50, the mpegs produced by mencoder are
> > useless unless you have mplayer. Now it seems that one needs similar
> black
> > magic tricks to get qtvideo, or even lavc with rv20, to work!
> >
> > The following command:
> > mencoder 'mf://fitImage*.jpg' -mf type=jpg:fps=2 -ovc lavc -lavcopts
> > vcodec=rv20 -o gaussMovie.rm
> >
> > Results in a movie that produces the following output from realplayer:
> > Unsupported document type. (
> >
> file:///afs/ir.stanford.edu/users/d/g/dgorur/Research/PC/Own_code/Matlab/Testing/GaussAll/gaussMovie.rm
> > )
>
> ?
> strange! Can you post a sample online?


Will do so.

> Attempts at qtvideo:
> > mencoder 'mf://fitImage*.jpg' -mf type=jpg:fps=2 -ovc qtvideo -o
> > gaussMovie.qt
> >
> > result in:
> > Making movie
> > MEncoder 1.0pre7try2-3.4.4 (C) 2000-2005 MPlayer Team
> > CPU: Advanced Micro Devices Athlon MP/XP Thoroughbred (Family: 6,
> Stepping:
> > 0)
> > Detected cache-line size is 64 bytes
> > CPUflags: Type: 6 MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 0
> > Compiled for x86 CPU with extensions: MMX MMX2 3DNow 3DNowEx SSE
> >
> > File not found: 'frameno.avi'
> > Failed to open frameno.avi
> > success: format: 16  data: 0x0 - 0x0
> > [demuxer] mf support.
> > [mf] search expr: fitImage*.jpg
> > [mf] number of files: 5 (20)
> > VIDEO:  [IJPG]  0x0  24bpp  2.000 fps    0.0 kbps ( 0.0 kbyte/s)
> > [V] filefmt:16  fourcc:0x47504A49  size:0x0  fps: 2.00  ftime:=0.5000
> > QuickTime6.3 DLLs found
> > QuickTime.qts patched!!! old entry=0x6693c3e0
> > theQuickTimeDispatcher catched -> 0x6693c3e0
> > WARNING! Invalid Ptr handle!
> >
> > ### Searching for QuickTime plugins (*.qtx) at /usr/local/lib/codecs...
> > ### FindNext: QuickTimeEssentials.qtx
> > ### FindNext: AvidQTAVUICodec.qtx
> > ### FindNext: QuickTimeInternetExtras.qtx
> > ### FindNext: BeHereiVideo.qtx
> > theQuickTimeDispatcher catched -> 0x6693c3e0
> > theQuickTimeDispatcher catched -> 0x6693c3e0
> > Opening video filter: [expand osd=1]
> > Expand: -1 x -1, -1 ; -1  (-1=autodetect) osd: 1
> >
> ==========================================================================
> > Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
> > Selected video codec: [ffmjpeg] vfm:ffmpeg (FFmpeg MJPEG decoder)
> >
> ==========================================================================
> > Writing AVI header...
> > ODML: Aspect information not (yet?) available or unspecified, not
> writing
> > vprp header.
> > VDec: vo config request - 1201 x 901 (preferred csp: Planar YV12)
> > Could not find matching colorspace - retrying with -vf scale...
> > Opening video filter: [scale]
> > VDec: using Planar YV12 as output csp (no 3)
> > Movie-Aspect is 1.33:1 - prescaling to correct movie aspect.
> > SwScaler: reducing / aligning filtersize 5 -> 4
> > SwScaler: reducing / aligning filtersize 1 -> 4
> > SwScaler: reducing / aligning filtersize 1 -> 1
> > SwScaler: reducing / aligning filtersize 5 -> 4
> >
> > SwScaler: BICUBIC scaler, from Planar YV12 to Packed YUY2 using MMX2
> > Cannot find requested component
> > FATAL: Cannot initialize video driver.
> >
> > Exiting...
> > ---------------
> > Rumours found in the depths of google sewers spoke in hushed whispers of
> > wrong video depths. Incidentally, all the jpegs are grayscale, so I
> don't
> > know what colorspace this stupid encoder is fretting about.
>
> I've never used qtvideo (I didn't even know that mencoder could encode
> using this codec lib), so I can't say for sure. Try appending "-vf
> scale" to the end of your command line. I may work.


Nope, didn't work. mencoder, of course, boasts that it can encode with
qtvideo: try
mencoder -ovc help
Curiouser and curiouser: rv10 works better than rv20, provided I use the -of
lavf option. Then realplayer `opens' it and `plays' it, although nothing
displays. It doesn't even seem to think that it's video content!

Dev

Guillaume
>
> --
> I am disillusioned enough to know that no man's opinion on any subject
> is worth a damn unless backed up with enough genuine information to
> make him really know what he's talking about.
>
> -- H. P. Lovecraft (about the flamewars on FFmpeg and MPlayer-dev mailing
> lists)
> http://www.brainyquote.com/quotes/quotes/h/hplovecr278144.html
>
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