python 3.x - opencv VideoCapture doesn't read from avi -

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i upgraded ubuntu 16.04, installed anaconda3 , installed opencv3 conda install -c https://conda.anaconda.org/menpo opencv3. tried reading avi file, cap = cv2.videocapture('/path/to/avi') cap.read() returns (false,none). capturing webcam works fine. have idea causing problem? read might have ffmpeg, have it:

$ ffmpeg -version ffmpeg version n-79139-gde1a0d4 copyright (c) 2000-2016 ffmpeg developers built gcc 4.8 (ubuntu 4.8.4-2ubuntu1~14.04.1) configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libfreetype --enable-gnutls --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvidstab libavutil      55. 19.100 / 55. 19.100 libavcodec     57. 30.100 / 57. 30.100 libavformat    57. 29.101 / 57. 29.101 libavdevice    57.  0.101 / 57.  0.101 libavfilter     6. 40.102 /  6. 40.102 libavresample   3.  0.  0 /  3.  0.  0 libswscale      4.  0.100 /  4.  0.100 libswresample   2.  0.101 /  2.  0.101 libpostproc    54.  0.100 / 54.  0.100


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