Ffmpeg gif lossless mp4#
Ffmpeg gif lossless full#

However, if your mp4 files are already very high quality, I expect the size difference will not be so great.įootnote 1: If you're using Microsoft Windows instead of UNIX, change /dev/null to NUL. When I tried -lossless 1 on a low-quality mp4, the resulting webm was 100× larger, which was not accceptable to me. You may need ffmpeg to convert video to PNG frames first.

Ffmpeg gif lossless full#

The -lossless 1 option of ffmpeg’s VP9 encoder enables lossless quality mode, but with a potentially enormous increase in filesize.Īll you need is this: ffmpeg -i input.mp4 -lossless 1 output.webm If you get erros about command not found, use full absolute path to gifski(.exe).

If you mean “without quality loss” literally A word about transcodingīy the way, in general, transcoding formats (taking a compressed video and recompressing it with a different codec) is a bad idea as you’ll not only add the normal errors from lossy video encoding, but you’ll waste bits in the new format trying to preserve the artifacts from the old. Please see the ffmpeg VP9 documentation if you’d like to learn more. The first pass compiles statistics about the video which is then used in the second pass to make a smaller and higher quality video. While that can be useful for streaming, it reduces quality significantly as frames with a lot of motion will not have the bandwidth needed to look good.Īnother part of the reason you’re losing quality is that webm (VP9) prefers to encode in two passes for best results. In this video, every image will be a frame at 30.How to convert a high quality. If you do not specify a video bitrate, it defaults to something low which gets you Constrained Quality mode, where each frame has a maximum bitrate. I have generated 180k images on my computer, which I now would like to turn into a video. It is important to set the video bitrate to zero. For VP9, the CRF can range from 0 (best quality) to 63 (smallest file size). All you need is this: ffmpeg -i input.mp4 -lossless 1 output.webm When I tried -lossless 1 on a low-quality mp4, the resulting webm was 100× larger, which was not accceptable to me. Setting the video bitrate to zero while also specifying the CRF (Constant Rate Factor) enables Constant Quality mode which targets a certain perceptual quality level. The -lossless 1 option of ffmpeg’s VP9 encoder enables lossless quality mode, but with a potentially enormous increase in filesize. I am using an AVerMedia Live Gamer 4K and the latest Win 64 Static nightly build of FFmpeg. Use two-pass Constant Quality mode:¹ ffmpeg -i input.mp4 -b:v 0 -crf 30 -pass 1 -an -f webm -y /dev/nullįfmpeg -i input.mp4 -b:v 0 -crf 30 -pass 2 output.webm I am trying to capture lossless 4K, 60 FPS, HDR game play for the purpose of frame rate analysis.