FOCUS Enhancements 3.2 user manual Latent Images or Flashing During Playback

Troubleshooting

"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.

Stuttering Files During Playback

Irregular playback can be caused by a number of conditions:

1.Mixed video only MPEG files with MPEG with video and audio data: Confirm that all files are either video only, audio only, or audio/video files. It is recommended to have a "blank" audio track encoded with all MPEG files--even if no audio is present on the source material. This will ensure compatibility, if MPEGs with audio/video information are introduced at a later date.

2.Dolby Digital files: Dolby Digital files can not be mixed with any other type of file. Ensure that all of the file types are the same.

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