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aminet/gfx/conv/mpeg_v1.2a.readme

short : Stanford MPEG encoder/decoder v1.2 alpha author : Andy C. Hung (Unix), ported to Amiga by Son H. Le Requirements (at least): 68000 CPU, 2 meg and lotsa harddisk space! uploader : s924723 minyos xx rmit oz au type : gfx/conv architecture : m68k-amigaos Filetype : application/x-lzh-compressed Size : 104.68K Date : 7-Sep-93 Download : 💾 https://de3.aminet.net/gfx/conv/mpeg_v1.2a.lha
This is the port of Stanford's MPEG utility version 1.2 alpha. It can encode/decode a mpeg file (.mpg) to its separate Y,U and V components. Combined with cyuv2ppm (another utility by Andy C. Hung) you can convert these component files into a standard PPM file or alternative make a mpeg anim file using ppm2cyuv (note: you'll also need ilbmtoppm). The PPM file can be manipulated using all sorts of PPM utilities to alter/fix/enhance the picture and ultimately convert into an displayable filetype (IFF,GIF,etc). Sample usage: Decoding short.mpg anim SHELL:> mpeg -d -s short.mpeg short START>SEQUENCE Transmission rate (bps): 6553200 Image Dimensions: 352x240 MPEG Block Dimensions: 352x240 GOP>FirstFrame: 0 START>Frame: 0 First decoder buffer bits = -256 Intraframe Decode: 0 END>Frame: 0 [snip..snip] END>Frame: 6 END>SEQUENCE Will output files short1.Y, short1.U, short1.V .. short6.Y, short6.U and short6.V. Now you can run "cyuv2ppm" (remember to supply the picture width and height if they're not the default NTSC: 352x240) through them to convert them to PPM files and finally "ppmtoilbm" to convert the PPM files to IFFs. Or alternatively, if you've got >wb2.04 you can use my Yuv2Iff script which automatically takes you through these steps. usage: Yuv2Iff base from to width height where base is the base filename. eg. in above example base=short from is the start frame to is the finish frame (converts "from" to "to" inclusively) width is the picture frame width \ mpeg will tell you these height is the picture frame height / at the beginning. So to continue the "short" decoding example, SHELL:> Yuv2Iff short 1 6 352 240 Processing... short1.[YUV] input size: 352x240 output size: 352x240 ppmtoilbm: computing colormap... ppmtoilbm: too many colors - proceeding to write a HAM6 file ppmtoilbm: if you want a non-HAM file, try doing a 'ppmquant 32' short1.Y Deleted short1.U Deleted short1.V Deleted [snip..snip] Done! Now you can use MkAnim by John Bickers to convert it to an ANIM7 file. If you think ppmtoilbm is too slow, try Wasp by Steven Reiz. However, when used on some mpegs, Wasp didn't make the background black. :( Bye! Son Le
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