+-----------------------------------------------------------------------
| Running ffmpeg on OpenBSD
+-----------------------------------------------------------------------

bktr(4) support (amd64/i386/powerpc only) may be controlled through the
following environment variables:

BKTR_DEV={0|1|2|3|4}: Selects device input (tuner, camera, ...)

BKTR_FORMAT={1|2|3|4|5|6}:
  1 PAL
  2 NTSC
  3 SECAM
  4 PALN
  5 PALM
  6 NTSCJ

BKTR_FREQUENCY=xxx.yy: Sets frequency in MHz
