我想用ffmpeg从Directshow卡(Osprey Card 450e)捕获到mp4流组播来编码实时流视频.目前我有这个错误.
ffmpeg -f dshow -i video="Osprey-450e Video Device 1A":audio="Osprey-450e Audio Device 1A" -f mpegts -b:v 5120k -r 30 -c:v mpeg2video -c:a ac3 -b:a 256k udp://239.192.42.61:1234
[dshow @ 02c7f640] Could not run filter video=Osprey-450e Video Device 1A:Audio?Osprey-450e Audio Device 1A: Input/output error
Ffmpeg可以编码Directshow输入吗？