On Thursday 28 October 2004 23:00, Dik Takken wrote: > In order to combine all of this into one MPEG2 stream, I start with > converting all three components to MJPEG files. All three MJPEG files need > to have the same resolution, interlacing and so on, or else lavtrans won't > be able to merge them into a single MJPEG file.
A better strategy, albeit more space consuming, would be to convert them into YUV4MPEG2 (if it still is called that nowadays; the raw YUV files produced by lav2yuv) instead. If you have more CPU than disk, you could convert-stream-and-feed-the-encoder via pipes instead. The YUV4MPEG2 header is not that hard to filter away in such a setup. This would give you better source material to work with, as it hasn't been MJPEG compressed. The YUV file is very simple and straightforward; with some scripting, you could even create it with a tool like convert from ImageMagick. > The most important question would probably be: Can I expect the resulting > video to look good on a TV screen? I can't try this at home because I > don't own a DVD burner myself, so I ask what you expect based on your > experience. I am a bit worried about this, because I lied to the ppmtoy4m > program about the ppm image being interlaced, while it's not. The top and > bottom fields of the image are very different, especially when the image > contains lots of thin horizontal lines. Could this mean that the TV image > starts flickering at 50 fps? Yes. At least antialias it a bit, or rethink the graphics. Make sure no lines are one pixel high, and make sure that any two-pixel lines occupy approximately the same place in the viewed image. Otherwise you will get those "bad weather map effects" the news programs has learned to avoid. /Sam ------------------------------------------------------- This Newsletter Sponsored by: Macrovision For reliable Linux application installations, use the industry's leading setup authoring tool, InstallShield X. Learn more and evaluate today. http://clk.atdmt.com/MSI/go/ins0030000001msi/direct/01/ _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
