Awesome! That will save me some time. =) I just tested the function, and it
works great.
-Jonathan
On Thu, Dec 23, 2010 at 1:03 AM, Dan Dennedy <[email protected]> wrote:
> On Wed, Dec 22, 2010 at 10:22 PM, Dan Dennedy <[email protected]> wrote:
> > On Wed, Dec 22, 2010 at 8:25 PM, Jonathan Thomas
> > <[email protected]> wrote:
> >> Dan,
> >> Do you have any code snippets or examples that I can use when debugging
> MLT
> >> to save an image buffer to a file, so I can view what the image looks
> like
> >> at various places inside MLT? For example, during filter processing
> (i.e.
> >> the affine filter), image buffers are passed around and modified, and
> >> debugging this kind of bug is quite tricky without seeing what is
> happening.
> >
> > Nothing exists now other than the consumers and carefully constructing
> > melt commands. However, ppm is easy to write, and it would be possible
> > to add a mlt_frame function to write a frame's image as ppm. You can
> > see code for reading ppm in src/modules/core/producer_ppm.c.
> >
> void mlt_frame_write_ppm( mlt_frame frame )
> {
> int width;
> int height;
> mlt_image_format format = mlt_image_rgb24;
> uint8_t *image;
>
> if ( mlt_frame_get_image( frame, &image, &format, &width, &height, 0
> ) == 0 )
> {
> FILE *file;
> char filename[16];
>
> sprintf( filename, "frame-%05d.ppm", mlt_frame_get_position(
> frame ) );
> file = fopen( filename, "wb" );
> if ( !file )
> return;
> fprintf( file, "P6\n%d %d\n255\n", width, height);
> fwrite( image, width * height * 3, 1, file );
> fclose( file );
> }
> }
>
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