value in case of error. Improve error reporting and consistency with
the other opt_* functions.
Originally committed as revision 14914 to svn://svn.ffmpeg.org/ffmpeg/trunk
{"b",OPT_FUNC2|HAS_ARG|OPT_VIDEO,{(void*)opt_bitrate},"set bitrate (in bits/s)","bitrate"},
{"vb",OPT_FUNC2|HAS_ARG|OPT_VIDEO,{(void*)opt_bitrate},"set bitrate (in bits/s)","bitrate"},
{"vframes",OPT_INT|HAS_ARG|OPT_VIDEO,{(void*)&max_frames[CODEC_TYPE_VIDEO]},"set the number of video frames to record","number"},
{"r",HAS_ARG|OPT_VIDEO,{(void*)opt_frame_rate},"set frame rate (Hz value, fraction or abbreviation)","rate"},
{"r",OPT_FUNC2|HAS_ARG|OPT_VIDEO,{(void*)opt_frame_rate},"set frame rate (Hz value, fraction or abbreviation)","rate"},
{"s",HAS_ARG|OPT_VIDEO,{(void*)opt_frame_size},"set frame size (WxH or abbreviation)","size"},
{"aspect",HAS_ARG|OPT_VIDEO,{(void*)opt_frame_aspect_ratio},"set aspect ratio (4:3, 16:9 or 1.3333, 1.7777)","aspect"},
{"pix_fmt",HAS_ARG|OPT_EXPERT|OPT_VIDEO,{(void*)opt_frame_pix_fmt},"set pixel format, 'list' as argument shows all the pixel formats supported","format"},