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- A little while ago I took a 4:3 1080p lossless Blu-Ray rip of a public domain short film, A Trip to the Moon. Straight off the Blu-Ray it's around 2.5 GB, at 1920x1080. (The left and right are made up of black bars.)
- Regardless of whether ffmpeg supports it (I don't think it does) is it technically possible to losslessly crop the black bars of the video, such that the final size is <=2.5 GB and every pixel within the 4:3 1280x1080 frame is preserved exactly as it appears on the Blu-Ray? When I used ffmpeg's crop commands, the final 15 minute video was 12 GB, because it was lossless and as I understand it it's like saving a JPEG as a PNG - the previous format compressed it well but ffmpeg couldn't crop it and keep the nice compression. The video is AVC in an MKV container.
- The only point of comparison I have is that a photo editing tool, Irfanview, has a JPEG lossless crop feature that re-arranges the relevant data within the file so it is neither re-compressed as a new JPEG (which causes quality loss) nor saved at a file size greater than the original size.
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