JVT-FR-EXT: fix FRExt2_Panasonic_C output format

[ndufresne]

No description provided.

[rgonzalezfluendo]

Right.

ffprobe FRExt2_Panasonic.avc
Input #0, h264, from 'FRExt2_Panasonic.avc':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: h264 (High), yuv420p(top first), 352x288, 24.08 fps, 25 tbr, 1200k tbn, 50 tbc

Thanks.

[ndufresne]

Thanks again, and sorry for these format errors, ffmpeg decoder integration does not force the format, so the resulting file was yuv420p and md5 matched, its later with some V4L2 support that Jonas found that mistake.