This is a known issue with recent versions of Apple Video Player and Mac OS 8.x on NuBus-based Power Macintosh systems with the AV card installed.
To work around this issue, install Apple Video Player 1.4.2 (or earlier). Be sure to also install the appropriate version of the Video Startup extension, because Apple Video Player and the Video Startup extension must match in order for the program to launch correctly.
This issue is specific to Apple Video Player. Third party programs (Adobe Premiere, for example) appear to be unaffected.
Currently , there is no fix other than the workaround described above.