[MEncoder-users] Problem with generating video from image files

[Torbjörn Rathsman]

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> Från: mencoder-users-bounces at mplayerhq.hu
> [mailto:mencoder-users-bounces at mplayerhq.hu]För Lobster
> Skickat: den 18 december 2011 06:45
> Till: MEncoder usage discussions
> Ämne: Re: [MEncoder-users] Problem with generating video from image
> files
>
>
> On 18/12/2011 9:04 a.m., Torbjörn Rathsman wrote:
> > I am trying to create a video file from a set of image file using the
> > following command:
> >
> > mencoder mf://../frames/%d.png -mf fps=25 -o ../video/new-video.avi -ovc
> > lavc -lavcopts
> >
> vcodec=mpeg4:mbd=2:mv0:trell:v4mv:cbp:last_pred=3:predia=2:dia=2:v
> max_b_fram
> > es=2:vb_strategy=1:precmp=2:subcmp=2:preme=2:qns=2:vbitrate=30000000
> >
> > After it comes to a completly black frame it says
> >
> > "The selected video_out device is incompatible with this codec."
> >
> > and aborts without generating a valid video file. If I remove the black
> > frame, everything works fine. How should I deal with this?
>
> It sounds to me like that black frame has been created with different
> colour settings
> than the other frames, or some thing similar.
>
> if I was you I would compare the colour depth and mode of the black png
> compared
> to the other ones, and then try to make the black png with the same
> settings as the
> other png's.
>

This frame was 1 bit per pixel black/white while the other was rgb24. What I
am doing is the following

mogrify -resize x720 ..\frames\*.png
mogrify -crop 1280x720+128+0 ..\frames\*.png
mencoder mf://../frames/%%d.png -mf fps=25 -o ../video/new-video.avi -ovc
lavc -lavcopts
vcodec=mpeg4:mbd=2:mv0:trell:v4mv:cbp:last_pred=3:predia=2:dia=2:vmax_b_fram
es=2:vb_strategy=1:precmp=2:subcmp=2:preme=2:qns=2:vbitrate=30000000

It looks like mogrify changes color type to save space when it can. However,
I guess I could do the resample and crop in the mencoder command. How?
First the frame should be resampled to a height of 720 pixels. Then the
width should be cropped to 1280 pixels preserving the center of the image.


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