盒子上编译sophon-sail报错的原因？

在盒子上编译sophon-sail，下载了对应版本的sophon-sail源码，执行cmake -DBUILD_PYSAIL=OFF ..
报错：
linaro@bm1684:/data/sail/sophon-sail/build$ cmake -DBUILD_PYSAIL=OFF ..-- The C compiler identification is GNU 9.3.0-- The CXX compiler identification is GNU 9.3.0-- Check for working C compiler: /usr/bin/cc-- Check for working C compiler: /usr/bin/cc -- works-- Detecting C compiler ABI info-- Detecting C compiler ABI info - done-- Detecting C compile features-- Detecting C compile features - done-- Check for working CXX compiler: /usr/bin/c++-- Check for working CXX compiler: /usr/bin/c++ -- works-- Detecting CXX compiler ABI info-- Detecting CXX compiler ABI info - done-- Detecting CXX compile features-- Detecting CXX compile features - done-- WITH_OPENCV: ON-- WITH_FFMPEG: ON-- WITH_BMCV: ON-- CMAKE_INSTALL_PREFIX: /opt/sophon-- LIBSOPHON_INCLUDE_DIRS: /opt/sophon/libsophon-current/includeCMake Error at build_unix.cmake:116 (find_package):  By not providing "FindFFMPEG.cmake" in CMAKE_MODULE_PATH this project has  asked CMake to find a package configuration file provided by "FFMPEG", but  CMake did not find one.  Could not find a package configuration file provided by "FFMPEG" with any  of the following names:    FFMPEGConfig.cmake    ffmpeg-config.cmake  Add the installation prefix of "FFMPEG" to CMAKE_PREFIX_PATH or set  "FFMPEG_DIR" to a directory containing one of the above files.  If "FFMPEG"  provides a separate development package or SDK, be sure it has been  installed.Call Stack (most recent call first):  CMakeLists.txt:9 (include)-- Configuring incomplete, errors occurred!See also "/data/sail/sophon-sail/build/CMakeFiles/CMakeOutput.log".linaro@bm1684:/data/sail/sophon-sail/build$ 但是盒子上/opt/sophon是有对应的FFMPEG
linaro@bm1684:/opt/sophon$ lltotal 20drwxr-xr-x 5 root root 4096 Dec 27 11:04 ./drwxr-xr-x 5 root root 4096 Feb 22 16:24 ../drwxr-xr-x 6 root root 4096 Dec 27 11:04 libsophon-0.5.1/lrwxrwxrwx 1 root root   27 Dec 27 11:04 libsophon-current -> /opt/sophon/libsophon-0.5.1/lrwxrwxrwx 1 root root   32 Dec 27 11:04 sophon-ffmpeg-latest -> /opt/sophon/sophon-ffmpeg_0.12.0/drwxr-xr-x 5 root root 4096 Dec 27 11:04 sophon-ffmpeg_0.12.0/lrwxrwxrwx 1 root root   32 Dec 27 11:04 sophon-opencv-latest -> /opt/sophon/sophon-opencv_0.12.0/drwxr-xr-x 7 root root 4096 Dec 27 11:04 sophon-opencv_0.12.0/盒子版本：
linaro@bm1684:/opt/sophon$ bm_versionSophonSDK version: v23.09 LTS-SP4sophon-soc-libsophon : 0.5.1sophon-soc-libsophon-dev : 0.5.1sophon-mw-soc-sophon-ffmpeg : 0.12.0sophon-mw-soc-sophon-opencv : 0.12.0BL2 v2.8(release):b3e005d Built : 10:53:36, Dec 27 2024BL31 v2.8(release):b3e005d Built : 10:53:36, Dec 27 2024U-Boot 2022.10 b3e005d (Dec 27 2024 - 10:53:31 +0800) Sophon BM1684KernelVersion : Linux bm1684 5.4.217-bm1684-g01adf91564c4 #1 SMP Fri Dec 27 10:53:44 CST 2024 aarch64 aarch64 aarch64 GNU/LinuxHWVersion: 0x11MCUVersion: 0x39