使用FFmpeg获取视频每一帧的信息
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FFmpeg给我提供了非常好的视频信息分析的办法，使用ffprobe对音视频流的结构的分析非常方便。
首先，可以通过ffprobe --help来查看一些详细的参数的意义
usage: ffprobe [OPTIONS] [INPUT_FILE]
Main options:
-L show license
-h topic show help
-? topic show help
-help topic show help
--help topic show help
-version show version
-buildconf show build configuration
-formats show available formats
-muxers show available muxers
-demuxers show available demuxers
-devices show available devices
-codecs show available codecs
-decoders show available decoders
-encoders show available encoders
-bsfs show available bit stream filters
-protocols show available protocols
-filters show available filters
-pix_fmts show available pixel formats
-layouts show standard channel layouts
-sample_fmts show available audio sample formats
-colors show available color names
-loglevel loglevel set logging level
-v loglevel set logging level
-report generate a report
-max_alloc bytes set maximum size of a single allocated block
-cpuflags flags force specific cpu flags
-hide_banner hide_banner do not show program banner
-sources device list sources of the input device
-sinks device list sinks of the output device
-f format force format
-unit show unit of the displayed values
-prefix use SI prefixes for the displayed values
-byte_binary_prefix use binary prefixes for byte units
-sexagesimal use sexagesimal format HOURS:MM:SS.MICROSECONDS for time units
-pretty prettify the format of displayed values, make it more human readable
-print_format format set the output printing format (available formats are: default, compact, csv, flat, ini, json, xml)
-of format alias for -print_format
-select_streams stream_specifier select the specified streams
-sections print sections structure and section information, and exit
-show_data show packets data
-show_data_hash show packets data hash
-show_error show probing error
-show_format show format/container info
-show_frames show frames info
-show_format_entry entry show a particular entry from the format/container info
-show_entries entry_list show a set of specified entries
-show_log show log
-show_packets show packets info
-show_programs show programs info
-show_streams show streams info
-show_chapters show chapters info
-count_frames count the number of frames per stream
-count_packets count the number of packets per stream
-show_program_version show ffprobe version
-show_library_versions show library versions
-show_versions show program and library versions
-show_pixel_formats show pixel format descriptions
-show_private_data show private data
-private same as show_private_data
-bitexact force bitexact output
-read_intervals read_intervals set read intervals
-default generic catch all option
-i input_file read specified file
-find_stream_info read and decode the streams to fill missing information with heuristics
选择一个视频文件，导出视频帧的信息到outframe.info的文件
查看视频的frame信息：
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