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Ffmpeg images to video 60 fps2/16/2023 ![]() See for details of x264's bitrate vs crf options. If you want to target a particular bitrate, use bitrate targeting (although you may get better results with crf). ![]() "No change in bitrate" can only be achieved if the source has a constant bitrate. "No change in duration, resolution" is achievable. No change in duration, resolution, bitrates, etc. Though you can always use the occasion to switch to a more efficient video codec. ![]() So re-encoding is required by doing so, you may need to increase the bitrate to keep the same quality, and your space savings might not be impressive. If you try to remove every even frame (2, 4, 6, 8), you'll hit problems: frames 3, 5, 7 need previous frames same problem with removing odd frames. So you may have a sequence such as this one: Frame# 1 2 3 4 5 6 7 8 … Reason for this is that I take up much more disk space (or bandwidth in case of streaming) than P frames. Typically, you'll have a single I-frame for tens or hundreds of P-frames. B frames also exist, but they don't matter right now. ![]() Why?īecause for most video formats, there are at least two types of frames: keyframes (we'll call them I) store the full image, and predicted frames (we'll call them P) only store the difference to previous frames. You cannot just drop random frames from most video formats. This is the most common method people answered for change framerates, it does changed the framerate, but it just so slow I can only gets 4x of speed (on 6-core CPU) and even slower when bitrate is higher at some point ffmpeg -i -filter:v fps=fps=30 Basically I want getting smaller file size quickly. and no audio needed, just want to lower the frame-rate while not taking long time to process it which is looking for a more efficient way, doesn't matter using other software or takes several lines of commands though. I'm asking just drop the frame rate from 60 to 30, no change in duration, resolution, etc. Though seems the OpenGL that usable with all GPU supports Filtering mode that used to reduce framerate, but right now too few information regarding how to implement this and the effectiveness. I know those who want a faster method and me don't have such graphics card, but having right tool is more efficient way than simply pile up core numbers The only way is using hardware-based encoder, specify NVENC.
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