Hi. The implementation of 'avdevice_capabilities_create'( https://ffmpeg.org/doxygen/trunk/avdevice_8c_source.html#l00143) starts with the following lines:
1 int ret; 2 av_assert0(s && caps); 3 av_assert0(s->iformat || s->oformat); 4 if ((s->oformat && !s->oformat->create_device_capabilities) || 5 (s->iformat && !s->iformat->create_device_capabilities)) 6 return AVERROR(ENOSYS); My guess is the -40(ENOSYS) error is returned in line 6. Can you check in your code if 'm_pFormatCtxInCam->iformat->create_device_capabilities' is different from null. The next step would be to understand why is 'm_pFormatCtxInCam->iformat->create_device_capabilities' null. With ffmpeg you just have to dive in the source code and try to understand it. Compiling a debug version of the ffmpeg libs/dlls is extremely useful for this purpose. > Maybe I did not initialize everything correctly or bad ordering of open input? > Please see my code: The code seems correct, my only problem with the above code is in the next line: > int ret = avformat_open_input(&m_pFormatCtxInCam, szUrl, m_pInFrmt, > &m_pInOptions); Try using no(NULL) options: int ret = avformat_open_input(&m_pFormatCtxInCam, szUrl, m_pInFrmt, NULL); Maybe opening an input with options shuts down the querying capabilities of the input, I don't really know, it's just a guess. Regards.
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