> I also had same error while building.

[anhtai9710]

I also had same error while building.
That's why I mentioned submitting PR with fix to FFmpeg
You can resolve the issue yourself by changing following lines in libavcodec/videotoolbox.c

#if TARGET_OS_IPHONE
     CFDictionarySetValue(buffer_attributes, kCVPixelBufferOpenGLESCompatibilityKey, kCFBooleanTrue);
#else
     CFDictionarySetValue(buffer_attributes, kCVPixelBufferIOSurfaceOpenGLTextureCompatibilityKey, kCFBooleanTrue);
 #endif

to following code:

#if TARGET_ABI_USES_IOS_VALUES
    CFDictionarySetValue(buffer_attributes, kCVPixelBufferOpenGLESCompatibilityKey, kCFBooleanTrue);
#elif TARGET_OS_OSX
    CFDictionarySetValue(buffer_attributes, kCVPixelBufferIOSurfaceOpenGLTextureCompatibilityKey, kCFBooleanTrue);
#endif

Everything worked well when I modify the libavcodec/videotoolbox.c, Thank you very much @666tos Your magic script really helped me .

Originally posted by @simayang01 in kewlbear/FFmpeg-iOS-build-script#147 (comment)