make -C libavutil all
make[1]: Entering directory `/home/n1/clean-live/conv/ffmpeg/libavutil'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/home/n1/clean-live/conv/ffmpeg/libavutil'
make -C libavcodec all
make[1]: Entering directory `/home/n1/clean-live/conv/ffmpeg/libavcodec'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/home/n1/clean-live/conv/ffmpeg/libavcodec'
make -C libavformat all
make[1]: Entering directory `/home/n1/clean-live/conv/ffmpeg/libavformat'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/home/n1/clean-live/conv/ffmpeg/libavformat'
make: *** No rule to make target `/home/n1/conv/ffmpeg/libavformat/avformat.h', needed by `ffmpeg.o'. Stop.