[MPlayer-users] documentation mencoder section multiple jpg / png / tga

[Helmut Rathgen]

Hello Guillaume,

here comes more information. I built the cvs snapshot including cvs 
libavcodecs. Also here libavcodec doesn't seem to handle the multiple 
.jpg correctly.

helmut at ncv77:~/phd/sfa/experiments/05_11_29/test$ mplayer mf://*.jpg -mf 
fps=25

MPlayer dev-CVS-050806-06:00-3.3.5 (C) 2000-2005 MPlayer Team
CPU: Intel Pentium 4/Xeon/Celeron Foster (Family: 8, Stepping: 9)
Detected cache-line size is 64 bytes
CPUflags:  MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
Compiled for x86 CPU with extensions: MMX MMX2 SSE SSE2


Playing mf://*.jpg.
[demux_mf] file type was not set! trying 'type=jpg'...
[mf] search expr: *.jpg
[mf] number of files: 9 (36)
VIDEO:  [IJPG]  0x0  24bpp  25.000 fps    0.0 kbps ( 0.0 kbyte/s)
vo: X11 running at 1280x1024 with depth 24 and 32 bpp (":0.0" => local 
display)
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffmjpeg] vfm:ffmpeg (FFmpeg MJPEG decoder)
==========================================================================
Audio: no sound
Starting playback...
VDec: vo config request - 680 x 512 (preferred csp: Unknown)
Could not find matching colorspace - retrying with -vf scale...
Opening video filter: [scale]
The selected video_out device is incompatible with this codec.
Also try adding the scale filter, e.g. -vf spp,scale instead of -vf spp.
mp_image: Unknown out_fmt: 0x0

FATAL: Could not initialize video filters (-vf) or video output (-vo).


Exiting... (End of file)


If I specify -vc ijpg, it works.

helmut at ncv77:~/phd/sfa/experiments/05_11_29/test$ mplayer mf://*.jpg -mf 
fps=25 -vc ijpg
MPlayer dev-CVS-050806-06:00-3.3.5 (C) 2000-2005 MPlayer Team
CPU: Intel Pentium 4/Xeon/Celeron Foster (Family: 8, Stepping: 9)
Detected cache-line size is 64 bytes
CPUflags:  MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
Compiled for x86 CPU with extensions: MMX MMX2 SSE SSE2


Playing mf://*.jpg.
[demux_mf] file type was not set! trying 'type=jpg'...
[mf] search expr: *.jpg
[mf] number of files: 9 (36)
VIDEO:  [IJPG]  0x0  24bpp  25.000 fps    0.0 kbps ( 0.0 kbyte/s)
vo: X11 running at 1280x1024 with depth 24 and 32 bpp (":0.0" => local 
display)
==========================================================================
Forced video codec: ijpg
Opening video decoder: [ijpg] JPEG Images decoder
Selected video codec: [ijpg] vfm:ijpg (Independent JPEG Group's codec)
==========================================================================
Audio: no sound
Starting playback...
VDec: vo config request - 680 x 512 (preferred csp: RGB 24-bit)
Could not find matching colorspace - retrying with -vf scale...
Opening video filter: [scale]
VDec: using RGB 24-bit as output csp (no 0)
Movie-Aspect is undefined - no prescaling applied.
SwScaler: reducing / aligning filtersize 1 -> 4
SwScaler: reducing / aligning filtersize 1 -> 4
SwScaler: reducing / aligning filtersize 1 -> 1
SwScaler: reducing / aligning filtersize 9 -> 8

SwScaler: BICUBIC scaler, from RGB 24-bit to Planar YV12 using MMX2
VO: [xv] 680x512 => 680x512 Planar YV12
V:   0.3   9/  9 ??% ??% ??,?% 0 
0                                                                                                                                                                                  


Exiting... (End of file)


This leads me to the conclusion that it is really important to use 
mencoder with the -vc ijpg option for multiple jpg movies. I think it 
could be of great help for newbees to find an example with the -vc ijpg 
option in the mjpg / mpng / mtga section of the Docs.

Thank you once again:-)!

All the best,

Helmut



Guillaume POIRIER wrote:

>Hi Helmut,
>
>On 11/30/05, Helmut Rathgen <helmut.rathgen at web.de> wrote:
>  
>
>>Hello Guillaume,
>>
>>thank you for your answer! I understand you are the one who is taking
>>care about the docs?!
>>    
>>
>
>Yes, I'm the current maintainer of MEncoder's docs.
>
>
>  
>
>>Really nice - they are great!
>>    
>>
>
>Thanks! I don't think I ever heared this since I contribute to
>MPlayer. Most users who post to the mailing list complain that the doc
>is too "high level" (which on the one hand I think is true, on the
>other hand it has the benefit not to treat the user as if he was
>stupid).
>
>
>  
>
>>I want to try to give you more information.
>>
>>    
>>
>>>problem. Helmut, what version of MPlayer are you using? Are you using
>>>CVS or a release? Try with latest CVS if you did not try already.
>>>
>>>      
>>>
>>I am using 1.0pre7try2.
>>    
>>
>
>Please, try with CVS version of MPlayer: pre7 is now fairly dated, and
>I would not be surprised if the problem you experience is fixed in
>CVS.
>
>
>  
>
>>I started from a set of .tif files. Converted them to .jpg.
>>
>>*|$> for i in *.tif; do convert -depth 8 -colorspace rgb $i `basename $i .tif`.jpg; done|
>>    
>>
>
>[..]
>
>  
>
>>==========================================================================
>>Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
>>INFO: libavcodec init OK!
>>Selected video codec: [ffmjpeg] vfm:ffmpeg (FFmpeg MJPEG decoder)
>>==========================================================================
>>Audio: no sound
>>Freeing 0 unused audio chunks.
>>Starting playback...
>>[ffmpeg] aspect_ratio: nan
>>VDec: vo config request - 680 x 512 (preferred csp: Unknown)
>>Trying filter chain: vo
>>Could not find matching colorspace - retrying with -vf scale...
>>Opening video filter: [scale]
>>SwScale params: -1 x -1 (-1=no scaling)
>>Trying filter chain: scale vo
>>The selected video_out device is incompatible with this codec.
>>mp_image: Unknown out_fmt: 0x0
>>*** [vo] Exporting mp_image_t, 680x512x0bpp YUV packed, 0 bytes
>>
>>FATAL: Could not initialize video filters (-vf) or video output (-vo).
>>
>>uninit video: ffmpeg
>>vo: uninit ...
>>
>>Exiting... (End of file)
>>
>>*...the movies doesn't play.
>>    
>>
>
>Ok... My guess is that ffmpeg's MJPEG decoder is somewhat broken or
>incorrectly initialised. That's a quite different problem than just
>updating docs.
>Please try if the problem still exists in CVS version or not (just
>follow the instructions listed on the link I gave you earlier).
>
>If the problem still exist, then either report the problem here or
>open a bugzilla report: http://bugzilla.mplayerhq.hu
>
>
>
>[..]
>
>  
>
>>I understand without -vc ijpg mplayer chooses lavc's ffmpeg to play the "mf://*.jpg" source. However ijpg is the better choice.
>>
>>Now as for the mencoder, I understand it works "in two steps". Correct me if I'm wrong. First mplayer generates a stream of the source and second this stream is fed to mencoder which generates the desired output file. So I can use the -vc option with mencoder to tell it how it should read the source, like
>>    
>>
>
>That's not technically correct, but that's a somewhat good approximation ^^
>
>[..]
>
>
>  
>
>>So I suggest it should be very useful for a newbee (like me) to understand from the examples in the mencoder mjpg / mpng / mtga Docs section that this is possible (and maybe sometimes necessary).
>>    
>>
>
>I'll see what I can do. If the doc has to be updated to work around a
>bug that can't be fixed right now, I may add a new FAQ entry.
>I could also add a note to MEncoder's docs to point out that in some
>cases it my be desirable to force the input codec with "-vc".
>
>But before I do that, please test CVS.
>
>Guillaume
>
>--
>MPlayer's doc is offline. Find some fresh one here:
>http://tuxrip.free.fr//MPlayer-DOCS-HTML/en/
>http://tuxrip.free.fr//MPlayer-DOCS-HTML/fr/
>
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>  
>