Black Bars on Sides when I render to 4:3?
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I am trying to produce a short video for upload to Amazon. They require a 4:3 aspect ratio. I have shot the footage in AVCHD 1920X1080. With the advice I received in an earlier post, I then changed my Project Properties to a custom setting of 1440X1080. I then clicked the Pan/Crop button on each video event and selected "Match Output Aspect". This seemed to do the trick. Then when I rendered it (720X480, square pixel, progressive) I ended up with thin black bars on the sides of the image.
I tried changing the Project Properties width slightly ( 1445) but it had no effect. I also tried changing the render width manually to (725) and it would automatically change it to (736) but it did not eliminate the bars either. Anyone know how to fix this? Any help would be appreciated. Thanks. |
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The square-pixel 4:3 standard def size is 640x480 - try that for the last render. Does that work? Ah, a closer look at those last settings reveals 720x480 at .909 PAR - DV. Rendering for online services is always better at 1.0PAR, the online services can do unpredictable things with non-square PAR. Are you embedding the amazon player in a webpage in photo #3? If so, this may be related to the height of the control bar not being considered in the pixel dimensions of the embedded player. Try adding 24 pixels or so to the height param, eg. instead of Code:
<object width="640" height="480">... You might also consider MP4 for the final render instead of MPEG2 - better quality for filesize, pixels are always square, IIRC. |
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The thin black bars just fill in the difference. Alternately, if you want a 4:3 image that is 720 wide, divide 720 by 4 (=180) and multiply by 3. You will get 540. So, 640x480 is 4:3, 720x540 is 4:3 (though not standard). But 720x480 is not 4:3, it is 3:2. |
Problem Solved
Thanks for the responses. I feel kinda stupid now. 640X480 did the trick. The video above is actually on YouTube not Amazon. Seth, I know what you mean about adding pixels for the control bar. I've had to do that before when embedding videos on my blog.
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While this may seem confusing, it's even worse to offer unintended misinformation that might cause problems down the road. Might as well give the full explanation up front and let folks know that what mathematically might work out as 4:3 isn't what is always called 4:3. Fortunately, this is all greatly simplified in the world of HDTV since it uses square pixels just like computers do. |
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