• Compression Techniques

  4096×4096 encoding to MPEG-2

  Posted by Geoff Skelton on October 7, 2011 at 10:41 pm

  When encoding 4096×4096 source images, the output has 4096×4096 pixel resolution, but displays only the top left quarter (2k worth) of the original image

  ffmpeg -f image2 -i V:ffmpegtestAL-3AL-3-ffmpeg-test_%05d.png -r 30 -bufsize 2M -b:v 36000k -minrate:v 36000k -maxrate:v 36000k e:sliceAL-3-ffmpeg-test-4k-4k-from-source.m2v

  ffmpeg -f image2 -i V:ffmpegtestAL-3AL-3-ffmpeg-test_%05d.png -r 30 -bufsize 2M -b:v 36000k -minrate:v 36000k -maxrate:v 36000k -s 4096X4096 e:sliceAL-3-ffmpeg-test-4k-4k-explicit.m2v

  MPEG-2 Output at 2k, however, showed the entire image.

  ffmpeg -f image2 -i V:ffmpegtestAL-3AL-3-ffmpeg-test_%05d.png -r 30 -bufsize 2M -b:v 36000k -minrate:v 36000k -maxrate:v 36000k -s 2048x2048 e:sliceAL-3-ffmpeg-test-2k.m2v

  I tested by “encoding” jpg frames, output frames showed the entire image.

  ffmpeg -f image2 -i V:ffmpegtestAL-3AL-3-ffmpeg-test_%05d.png -s 4096x4096 -f image2 V:ffmpegtestAL-34k-encode-check-framesAL-3-ffmpeg-test-4k_%04d.jpg

  Can you give me hope that ffmpeg will be able to encode the resolution I need?

  I installed this: ffmpeg-git-6638207-win32-static.7z
  I read this: ffmpeg.html
  this: faq.html
  and this: general.html

  Many thanks for any advice,

  Geoff Skelton

  Geoff Skelton replied 14 years, 11 months ago 1 Member · 0 Replies
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