[Libav-user] Warnings using wmv2 encoder

[Robert Krüger]

Hi,

I am encoding via API using the wmv2 encoder and the resulting video
looks fine but I get the following warnings (I am pasting all of them
here in case the amount gives an indication regarding the cause) for
encoding a clip of a little more than 2 seconds:

Output #0, asf, to '(null)':
    Stream #0:0: Video: wmv2, yuv420p, 1920x1080, q=2-31, 200 kb/s, 25 tbc
[wmv2 @ 0x7ff6f252f400] warning, clipping 1 dct coefficients to -255..255
[wmv2 @ 0x7ff6f252f400] warning, clipping 1 dct coefficients to -255..255
[wmv2 @ 0x7ff6f252f400] warning, clipping 1 dct coefficients to -255..255
[wmv2 @ 0x7ff6f252f400] warning, clipping 1 dct coefficients to -255..255
[wmv2 @ 0x7ff6f252f400] warning, clipping 1 dct coefficients to -255..255
[wmv2 @ 0x7ff6f252f400] warning, clipping 1 dct coefficients to -255..255
[wmv2 @ 0x7ff6f252f400] warning, clipping 1 dct coefficients to -255..255
[wmv2 @ 0x7ff6f252f400] warning, clipping 1 dct coefficients to -255..255
[wmv2 @ 0x7ff6f252f400] warning, clipping 1 dct coefficients to -255..255
[wmv2 @ 0x7ff6f252f400] warning, clipping 1 dct coefficients to -255..255
[wmv2 @ 0x7ff6f252f400] warning, clipping 1 dct coefficients to -255..255
[wmv2 @ 0x7ff6f252f400] warning, clipping 1 dct coefficients to -255..255
[wmv2 @ 0x7ff6f252f400] warning, clipping 1 dct coefficients to -255..255
[wmv2 @ 0x7ff6f252f400] warning, clipping 1 dct coefficients to -255..255

Does anyone know what possible reasons for this could be? Doing the
same transcoding (to the best of my knowledge) on the command line
with ffmpeg built from the same sources as the libs for my application
doesn't produce any warnings.

I know this is not a lot of information but maybe this rings a bell for someone.

Thanks,

Robert