[XviD-devel] input format

[Christoph Lampert]

xvid_encraw takes either "YUV within PGM" or "raw YUV" as input, you can 
specify which to use by the "-type" command line parameter. 0=yuv, 1=pgm

raw YUV does't have information on frame size in them, you have to know it 
in advance. For "YUV within PGM" each frame has a short header with 
the framesize (and some other data) in it.  

raw PGM is more or less a homebrewn format, you can create files yourself 
e.g. with mplayer's pgm output (just 'cat' all output PGM into one big 
file), or with ffmpeg. 

raw YUV is more common for download from the internet, e.g. ".qcif" are 
raw YUV files of the fixed size 176x144 and ".cif" are 352x288 (so qcif is 
one _q_uarter the pixels of cif). 

So, if you have a .qcif file, using 

xvid_encraw -type 0 -w 176 -h 144 -i inputfile.qcif -o outputfile.m4v

should give you useful operation, and output like 


xvid_encraw - raw mpeg4 bitstream encoder written by Christoph Lampert 
2002-2003

    0: key=2, time=      5, len=    8006 | type=I, quant=  2, len=    8006
    1: key=0, time=     10, len=     507 | type=P, quant=  2, len=     507
    2: key=0, time=      9, len=     410 | type=P, quant=  2, len=     410
    3: key=0, time=      8, len=     344 | type=P, quant=  2, len=     344
    4: key=0, time=      8, len=     318 | type=P, quant=  2, len=     318
...
  869: key=0, time=      8, len=     284 | type=P, quant=  2, len=     284
   -1: key=0, time=      0, len=      -5
Tot: enctime(ms) =8707.51,               length(bytes) = 1008509
Avg: enctime(ms) =  10.01, fps =  99.91, length(bytes) =    1159


gruel



On Wed, 3 Nov 2004, Tom Jacobs wrote:
> ive got a little problem with testing my threaded encoder. i think it is
> probable down to the raw images that i am paasing in. im not really sure
> how to process *.yuv *.ppm and *.qcif files. i have a variety of these both
> in single file or one per frame. what parameters do i use to set these as an
> input? can i have the seperate files as an input or do i need to combine
> them in someway. ive had various sucess doing this with the 'convert' tool.
>  when i have tried to play my outputed m4v files in mplayer the colour is
> wrong and the picture is not right either. you can tell the image but its
> got a constant 'not rightness' to it, this is the same for both my encoder
> and the xvidcore
> 
> any help would be greatful
> 
> thanks
> 
> Tom
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