Picture Rolls Or Other Video Problems Occur When Using External Audio/Video Switching - Visual Circuits Firefly User Manual

Troubleshooting
Picture Rolls or Other Video Problems Occur
When Using External Audio/Video Switching
Genlock must be turned on in the Firefly system settings for
external audio/video switching to work properly. See Genlock on
page 79 for details on how set this parameter.
If you do not genlock to the video input, the Firefly system will
turn this parameter on temporarily for the duration of the playlist;
however, note that this temporary setting switch may cause picture
roll to occur at the beginning and/or end of the playlist.
"Latent Images" or "Flashing" During
Playback
1. Incorrect timecodes or improperly closed encoding session. If
the incorrect timecode is given for a particular file it is possible
to actually encode a frame or two of the trailer or header
information from the source. Often this "extra" frame is seen
only briefly and may appear as a "flash" on the screen. Review
the original source of the encoding and determine if the
timecodes are correct or if the encoding session was actually
closed on the proper frame.
2. Playing MPEG 1 and MPEG2 files back to back: The
resolution switch from MPEG 1 files (342X240) to MPEG2
files (720X480) causes a "latent image" or a "quadrant display"
of the last played file's image. The only way to perform
seamless playback when using a playlist of files is to insert an
encoded "black file" with blank audio track, between MPEG 1
and MPEG 2 files. The black MPEG file preceding the
playback file should be of the same standard. In other words,
prior to an MPEG 1 file the "black file"--again with a blank
audio track--should be MPEG 1 and vice versa.
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