maintaining closed caption information

david_at_houston wrote on 9/29/2010, 8:11 PM

I have a DVD with closed caption encoding. (I have hearing impaired students who need captions.) I needed to save a short clip from the DVD. I rendered the clip using the default setting for WMV, 512 Kbps. When I played the clip, the closed captions were not viewable. What do I need to do to maintain the closed caption encoding?

I am using version 8.0c, Build 142.
Thank you.

Comments

Chienworks wrote on 9/30/2010, 4:19 AM

The 512Kbps template is only 320x240. You'll have to maintain the original 720x480 resolution. There aren't any WMV templates for that so you'll have to go into custom settings and type in the 720. You'll also need a much higher bitrate to maintain the captioning data codes. Probably 3Mbps is the absolute minimum that will do it. I'd go with 6Mbps just to be safe.

MSmart wrote on 9/30/2010, 11:14 AM

How did you import the DVD clip into VMS?

I could be wrong (no direct experience) but I don't think VMS has the ability to decode the CC stream from the DVD. You may need a third party software do to it, I found this:

CCExtractor

Unless what Chienworks suggested, keepting the bitrate up, is all you need.

Chienworks wrote on 9/30/2010, 1:52 PM

If it's actual closed captioning, and not DVD subtitles, then the information will be encoded in the video stream as part of the video frame. As long as conversions don't distort the data or compress it overly much it should be preserved.

DVD subtitles are a completely different matter. They aren't stored within the video itself.