This may be an old topic:
When “INTERNAL” is selected for preview, I get video but no audio,
When “DIRECT SHOW” is selected with Dfab video and audio selected, I get no video but good audio. If I select the “ffdshow” decoder with Dfab audio, I get video in a different window with good audio. The 5 series version of Dfab worked with no problem when set to “DIRECT SHOW” with Dfab video and audio decoders selected. Any fix for this… it would be nice to be able to view the video in the Dfab box and be able to select the audio track.