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</o:shapelayout></xml><![endif]--></head><body lang=RU link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US>Hi!<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I try to use avdevice_list_devices() for getting list of video devices, but don’t clearly understand, how to do that properly. How should I properly init AVFormatContext for calling avdevice_list_devices()?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Tried something like that:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>int main() {<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> avdevice_register_all();<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> avcodec_register_all();<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> AVFormatContext* format_context = avformat_alloc_context();<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> AVInputFormat *fmt = av_find_input_format("dshow");<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> AVDeviceInfoList *device_list=NULL;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> int err = avformat_open_input(&format_context, NULL, fmt, NULL);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> if (err != 0) {<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> fprintf(stderr, "ffmpeg: Unable to open input: %d\n", err);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> }<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> int i = avdevice_list_devices(format_context, &device_list);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> return 0;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>}<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>But avformat_open_input() returns error (code -1414092869), and so does avdevice_list_devices() (code -40)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>