How to check 'Output bit depth' of the libx264 library in ffmpeg?

Question

According to the x264 Encoding Guide, the crf scale depends on whether x264 is 8-bit or 10-bit. Supposedly x264 --help shows the Output bit depth. But on Windows ffmpeg -h full doesn't say anything about Output bit depth and the crf scale option is described as from -1 to FLT_MAX. How can I check if my ffmpeg is using 8-bit or 10-bit version of the libx264 library?

Answer 1

You can run ffmpeg -h encoder=libx264 and look for values of supported pixel formats.

For bit-depth=8 of libx264 it will be something like:

Supported pixel formats: yuv420p yuvj420p yuv422p yuvj422p yuv444p yuvj444p nv12 nv16

And for bit-depth=10 of libx264 it will be something like:

Supported pixel formats: yuv420p10le yuv422p10le yuv444p10le nv20le