从命令行中制作平滑的、流畅的慢动作视频。
BF is a video manipulation tool that can:
BF works by rendering intermediate frames between existing frames using a process called motion interpolation. Given two existing frames, A and B, this program can generate frames C.1, C.2...C.n positioned between the two. In contrast to other tools that can only blend or dupe frames, this program warps pixels based on motion to generate new ones.
The addition of interpolated frames gives the perception of more fluid animation commonly found in high frame rate videos, an effect most people know as the "soap opera effect".
Besides creating motion interpolated videos BF can leverage interpolated frames to make fluid slow motion videos:
In these examples BF slowed a 1sec video down by 10x. An additional 270 frames were interpolated from 30 original source frames giving the video a smooth feel during playback. The same video was slowed down using FFmpeg alone, but because it dupes frames and can't interpolate new ones the video has a noticeable stutter (shown on the right-hand side).
Requirements: A 64-bit system with a compatible graphics device.
BF requires no setup to use but it's too slow out of the box to do any serious work. BF can take advantage of hardware accelerated methods to make rendering significantly faster, but this requires that you have a functional OpenCL environment on your machine.
You can check if you have a compatible OpenCL device by running butterflow -d. If BF detects your device no other set up is necessary, otherwise continue reading below.
First make sure that you have the latest version of your graphics driver installed and then try running butterflow -d again. If BF still fails to detect your device, try specifying the location of your hardware's OpenCL client driver in the registry at HKEY_LOCAL_MACHINE\SOFTWARE\Khronos\OpenCL\Vendors by adding a key with the full path to the DLL as a REG_DWORD type with a data value of 0. NVIDIA users should look for nvopencl64.dll, AMD: amdocl64.dll, and Intel: IntelOpenCL64.dll by searching system folders, then add the keys with Registry Editor.
You may still need to add 32-bit keys even if you're on a 64-bit system. Do the same for 32-bit drivers nvopencl32.dll, amdocl32.dll, ..., at HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Khronos\OpenCL\Vendors.
Example for NVIDIA:
[HKEY_LOCAL_MACHINE\SOFTWARE\Khronos\OpenCL\Vendors]
"C:\Windows\System32\nvopencl64.dll"=dword:00000000
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Khronos\OpenCL\Vendors]
"C:\Windows\System32\nvopencl32.dll"=dword:00000000
When finished, run butterflow -d again to check if your device is detected.
No setup on macOS is necessary because Apple provides OpenCL support by default on all newer Macs. If you're on Linux, please seek other sources on how to satisfy the OpenCL requirement.
Run butterflow -h for a full list of options. See: Example Usage for typical commands.
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