[libdv-dev] YUV output from PAL DV - more details

[Christoph S. <ch...@ne...>]

Hello,

My first e-mail about my PAL -> YUV 4:2:0 conversion problems with libdv-0.7
was probably a little cryptic.

This is the kind of code I use to decode the DV frame:
    
    static dv_decoder_t *decoder;
    guint16 pitches[3];
    unsigned char *frame[3]
    static unsigned char dv_data[512*1024];

    ...
    allocate memory for frame
    ...

    decoder = dv_decoder_new();
    dv_init();
    decoder->quality = DV_QUALITY_BEST;

    ...
    read dv_data from AVI file
    ...

    dv_parse_header(decoder, dv_data);
    switch(decoder->sampling) {
        case e_dv_sample_420:
            pitches[0] = decoder->width;
            pitches[1] = decoder->width / 2;
            pitches[2] = decoder->width / 2;
            res = dv_decode_full_frame(decoder, dv_data, e_dv_color_yuv,
                (guchar **) frame, pitches);
            break;
        default:
            break;
    }


I also prepared two 5 second MPEG-1 sequences (VCD compatible video streams)
that show the correct output using RGB decoding of the DV data (through
dv2jpg) and the result I get using YUV decoding or Xv output in kino-0.4. The
files are about 700K each and you can download them from
    http://markov.chem.rochester.edu/chris/dv_tst.mpg
    http://markov.chem.rochester.edu/chris/dv_tst_correct.mpg

The setup I am using is Debian woody and XFree 4.0.2 with the Xv patch from
Gatos for my r128 video card (Xpert2000).
    
Thanks in advance,

Christoph

------------------------------------------------------------------------------
 Christoph Scheurer              e-mail: ch...@fe...
 Department of Chemistry         WWW: http://markov.chem.rochester.edu/chris
 University of Rochester
 P.O. Box RC 270216              phone:  +1-716-275-8289
 Rochester, NY 14627-0216                +1-716-242-0989 (private)
 USA                             Fax:    +1-716-473-6889
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