[win10] ffmpeg 學習筆記
阿新 • • 發佈：2018-10-31
目錄
1.官方宣傳
一個完整的跨平臺解決方案，用於錄製，轉換和流式傳輸音訊和視訊。FFmpeg是領先的多媒體框架，能夠解碼，編碼， 轉碼，複用，解復用，流式傳輸
2.下載與安裝
2.1 下載
官網：https://ffmpeg.zeranoe.com/builds/
- FFmpeg分為3個版本：
Static、Shared、Dev - 前兩個版本可以直接在命令列中使用。包含了三個
exe:ffmpeg.exe，ffplay.exe，ffprobe.exe Static版本中的exe體積較大,那是因為相關的Dll都已經編譯進exe裡面去了。Shared版本中exe的體積相對小很多,是因為它們執行的時候還需要到相關的dll中呼叫相應的功能Dev版本用於開發,裡面包含了庫檔案xxx.lib以及標頭檔案xxx
本博主下載的是 ffmpeg-20181028-bdfd2e3-win64-static
2.2 安裝
他沒有安裝程式，我們需要把包含exe的那個資料夾放入環境變數，重啟電腦即可。
3.用法
3.1 ...\ffmpeg\bin 下三個exe的解釋
藉由雷神的 https://blog.csdn.net/leixiaohua1020/article/details/15811977，我們可以瞭解ffmpeg.exe、ffplay.exe和ffprobe.exe 的用法
3.1.1 ffmpeg.exe
ffmpeg是用於轉碼的應用程式。
一個簡單的轉碼命令可以這樣寫：
將input.avi轉碼成output.ts，並設定視訊的位元速率為640kbps
ffmpeg -i input.avi -b:v 640k output.ts具體的使用方法可以參考： ffmpeg引數中文詳細解釋
詳細的使用說明（英文）：http://ffmpeg.org/ffmpeg.html
3.1.2 ffplay.exe
ffplay是用於播放的應用程式。
一個簡單的播放命令可以這樣寫：
播放test.avi
ffplay test.avi
具體的使用方法可以參考：ffplay的快捷鍵以及選項
詳細的使用說明（英文）：http://ffmpeg.org/ffplay.html
3.1.3 ffprobe.exe
ffprobe是用於檢視檔案格式的應用程式。
這個就不多介紹了。
詳細的使用說明（英文）：http://ffmpeg.org/ffprobe.html
3.2 ffmpeg 命令列
在cmd中 ffmpeg.exe -h 檢視ffmpeg說明，可以看到：
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...
Getting help:
-h -- print basic options
-h long -- print more options
-h full -- print all options (including all format and codec specific options, very long)
-h type=name -- print all options for the named decoder/encoder/demuxer/muxer/filter/bsf
See man ffmpeg for detailed description of the options.
Print help / information / capabilities:
-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
-sources device list sources of the input device
-sinks device list sinks of the output device
-hwaccels show available HW acceleration methods
Global options (affect whole program instead of just one file:
-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
-y overwrite output files
-n never overwrite output files
-ignore_unknown Ignore unknown stream types
-filter_threads number of non-complex filter threads
-filter_complex_threads number of threads for -filter_complex
-stats print progress report during encoding
-max_error_rate maximum error rate ratio of errors (0.0: no errors, 1.0: 100% errors) above which ffmpeg returns an error instead of success.
-bits_per_raw_sample number set the number of bits per raw sample
-vol volume change audio volume (256=normal)
Per-file main options:
-f fmt force format
-c codec codec name
-codec codec codec name
-pre preset preset name
-map_metadata outfile[,metadata]:infile[,metadata] set metadata information of outfile from infile
-t duration record or transcode "duration" seconds of audio/video
-to time_stop record or transcode stop time
-fs limit_size set the limit file size in bytes
-ss time_off set the start time offset
-sseof time_off set the start time offset relative to EOF
-seek_timestamp enable/disable seeking by timestamp with -ss
-timestamp time set the recording timestamp ('now' to set the current time)
-metadata string=string add metadata
-program title=string:st=number... add program with specified streams
-target type specify target file type ("vcd", "svcd", "dvd", "dv" or "dv50" with optional prefixes "pal-", "ntsc-" or "film-")
-apad audio pad
-frames number set the number of frames to output
-filter filter_graph set stream filtergraph
-filter_script filename read stream filtergraph description from a file
-reinit_filter reinit filtergraph on input parameter changes
-discard discard
-disposition disposition
Video options:
-vframes number set the number of video frames to output
-r rate set frame rate (Hz value, fraction or abbreviation)
-s size set frame size (WxH or abbreviation)
-aspect aspect set aspect ratio (4:3, 16:9 or 1.3333, 1.7777)
-bits_per_raw_sample number set the number of bits per raw sample
-vn disable video
-vcodec codec force video codec ('copy' to copy stream)
-timecode hh:mm:ss[:;.]ff set initial TimeCode value.
-pass n select the pass number (1 to 3)
-vf filter_graph set video filters
-ab bitrate audio bitrate (please use -b:a)
-b bitrate video bitrate (please use -b:v)
-dn disable data
Audio options:
-aframes number set the number of audio frames to output
-aq quality set audio quality (codec-specific)
-ar rate set audio sampling rate (in Hz)
-ac channels set number of audio channels
-an disable audio
-acodec codec force audio codec ('copy' to copy stream)
-vol volume change audio volume (256=normal)
-af filter_graph set audio filters
Subtitle options:
-s size set frame size (WxH or abbreviation)
-sn disable subtitle
-scodec codec force subtitle codec ('copy' to copy stream)
-stag fourcc/tag force subtitle tag/fourcc
-fix_sub_duration fix subtitles duration
-canvas_size size set canvas size (WxH or abbreviation)
-spre preset set the subtitle options to the indicated preset
4.思考：接下來我們該做什麼？
博主從來沒有見過-h出來這麼多命令的exe，這簡直就是在勸退所有初學者......ok，我先摸索摸索路子，船到橋頭自然直嘛。記錄一下，我找到一箇中文版的教程https://www.longqi.cf/tools/2015/02/13/ffmpegcn/，看了一下，其實就是翻譯，不過沒亂碼~感謝感謝，還有一個新一點的http://wiki.11ten.net/Resources/ffmpeg-%E4%B8%AD%E6%96%87%E6%96%87%E6%A1%A3.html。
接下來我們慢慢剖析這些命令列，沒事，博主頭鐵。
參考
1.https://www.jianshu.com/p/7ed3be01228b
2.https://blog.csdn.net/leixiaohua1020/article/details/15811977