View Full Version : mpeg stills are cut off
azurenights
20th January 2002, 05:57
Well when I authored a svcd with a introductory still image everything worked fine apart from the fact that the outerparts of the image were cut off by the tv. I resized the image to 768x576 and then uploaded the image to http://www.vcdimager.org/stillencode/
which encodeded the image for me so that I could put it in my svcd. Has anyone else had this problem of the outer parts of the image being cut off by the tv?? If so how should I resize my image??? Should I make it smaller so the whole image can be shown on the tv?? My player doesn't zoom or anything so I don't have the option to zoom out. any help would be appreciated!! thanks
Radioman
20th January 2002, 13:15
I have the same problem and have my own sollution when it comes to capture TV shows etc.
I capture *.avi at 448x544 with Picvideo Q19 with VirtualDub. Then I use avisynth and adds border 16,16,16,16 to the sript beore it goes for mpeg conversion. This is for PAL SVCD (480x576).
Maybe there is problem with some card to capture with those settings but my ATI AIW 16mb AGP works great for this.
24hourloop
20th January 2002, 15:26
This is normal. It's called overscan. As a matter of fact some of these lines contain non-picture specific information (You may have noticed during capture, depending upon your card that there are some black and white tiny bars hopping around on some of the lines. You will *not* see this when you capture from a video tape).
You have several options:
a.) Insert black information where the overscan lines are.
b.) Live with it. If you display the same movie on your PC monitor instead the black information might be very annoying. Or should you ever get an LCD TV.
I prefer b.) Take it into consideration when making titles.
Kedirekin
20th January 2002, 15:32
Many (most?) TVs have overscan. This is perfectly normal. In fact, I believe most subtitles end 40-60 pixels above the bottom of the image for this very reason. There is nothing wrong with either your encode or your TV.
The amount of overscan varies from TV to TV, but I believe it is almost always greater than 16 pixels on each edge (on my TV, it appears to hover between 18 and 28; it varies by edge and changes over time). If I were you and I absolutely had to see the entire image on the screen, I'd add borders (preferably the same color as your image background) at least 32 pixels wide all the way around.
In partial response to Radioman's post, I wouldn't recommend either capture (or resize) at anything other than a vertical resolution of 480 unless you're absolutely certain the source is progressive - which means never for NTSC. Cropping to another size is fine (I crop overscan quite regularly), but resize (or capture) with vert resolution other than 480 is likely to wreak havok with interlaced sources.
Radioman
21st January 2002, 06:55
@Kederekin
Source is interlaced and I just add borders. No resize and no problem at all. Works great and there is no rubbish shown because, as you mentioned , the overscan is much more then 16 pixels at every side.
:cool:
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