On Fri, 3 Jun 2005, Luca Bonissi wrote:
> I have a problem with PAL DV:
>
> **ERROR: [lav2yuv] DV PAL YV12 input was not configured at compile time
Sigh, not *that* again. It seems to come up periodically.
About the time that folks have forgotten the previous discussion
someone else stumbles into the problem.
> # ifndef LIBDV_PAL_YV12
> //mjpeg_error_exit1("DV PAL YV12 input was not configured at " \
> "compile time");
> Do you know why you put this restriction?
Because libdv couldn't make up its mind about PAL DV being 4:2:0
or 4:2:2? ;)
> P.S.: I also tried to compile libdv --with-pal-yuv=YV12 but I had the
> same error. So I manully defined the macro LIBDV_PAL_YV12 but the chroma
> output was wrong...
libdv's handlng of PAL DV was (is?) a bit of a mess. libdv by
default changes the 4:2:0 planar output to 4:2:2 packed (YUY2) but
there is nothing in the libdv.h file that tells which output format
libdv was built to use. Seems weird since PAL DV is 4:2:0.
mjpegtools tried to guess (or allow the user to specify) which
way libdv was configured - that is what the '--with-pal-yuv' option
is for. But, alas, there seems to be a bug somewhere :( Using that
option apparently doesn't define the macro LIBDV_PAL_YV12.
The whole situation is a mess (as you've noticed). The user was
required to guess how libdv was built, and even then things wouldn't
work right it seems.
It looks like libdv places the output format ("yv12" or "yuy2") into
the decoder->sampling member.
It is time for the LIBDV_PAL_YV12 issue to be resolved. As the first
step in this I have removed the LIBDV_PAL_YV12 usage in mjpegtools.
I do not have any PAL equipment I can not test the changes, it is
quite possible that PAL DV handling has a bug it did not have before.
If there are any PAL DV users who could check the CVS version of
mjpegtools (after SourceForge makes the changes available to
anonymous cvs) that would be wonderful. Post the problem reports
(and fixes ;)) to either the -users or -devel lists
Cheers,
Steven Schultz
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