int black_after; ///< first frame for which to output a black frame, rather than the actual video content, or 0 for none
int decode_video_frequency; ///< skip frames so that this many are decoded in all (or 0) (for generating thumbnails)
bool decode_audio; ///< true to decode audio, otherwise false
int black_after; ///< first frame for which to output a black frame, rather than the actual video content, or 0 for none
int decode_video_frequency; ///< skip frames so that this many are decoded in all (or 0) (for generating thumbnails)
bool decode_audio; ///< true to decode audio, otherwise false