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@ -6,67 +6,66 @@ ffprobe用于检测多媒体流格式；ffplay用于播放视频,包括本地与 |
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# 一、ffmpeg命令行 |
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## 1、命令行参数介绍 |
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Print help / information / capabilities:<br> |
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-help show help<br> |
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-version show version<br> |
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-formats show available formats<br> |
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-muxers show available muxers<br> |
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-demuxers show available demuxers<br> |
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-devices show available devices<br> |
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-codecs show available codecs<br> |
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-decoders show available decoders<br> |
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-encoders show available encoders<br> |
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-bsfs show available bit stream filters<br> |
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-protocols show available protocols<br> |
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-filters show available filters<br> |
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-pix_fmts show available pixel formats<br> |
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-sample_fmts show available audio sample formats<br> |
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-hwaccels show available HW acceleration methods<br> |
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Global options (affect whole program instead of just one file:<br> |
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-v loglevel set logging level<br> |
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-y overwrite output files<br> |
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-n never overwrite output files<br> |
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-filter_threads number of non-complex filter threads<br> |
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-stats print progress report during encoding<br> |
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-vol volume change audio volume (256=normal)<br> |
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Per-file main options:<br> |
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-f fmt force format<br> |
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-c codec codec name<br> |
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-codec codec codec name<br> |
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-t duration record or transcode "duration" seconds of audio/video<br> |
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-to time_stop record or transcode stop time<br> |
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-fs limit_size set the limit file size in bytes<br> |
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-ss time_off set the start time offset<br> |
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-sseof time_off set the start time offset relative to EOF<br> |
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-frames number set the number of frames to output<br> |
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Video options:<br> |
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-vframes number set the number of video frames to output<br> |
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-r rate set frame rate (Hz value, fraction or abbreviation)<br> |
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-s size set frame size (WxH or abbreviation)<br> |
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-aspect aspect set aspect ratio (4:3, 16:9 or 1.3333, 1.7777)<br> |
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-vn disable video<br> |
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-vcodec codec force video codec ('copy' to copy stream)<br> |
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-vf filter_graph set video filters<br> |
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-ab bitrate audio bitrate (please use -b:a)<br> |
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-b bitrate video bitrate (please use -b:v)<br> |
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Audio options:<br> |
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-aframes number set the number of audio frames to output<br> |
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-aq quality set audio quality (codec-specific)<br> |
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-ar rate set audio sampling rate (in Hz)<br> |
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-ac channels set number of audio channels<br> |
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-an disable audio<br> |
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-acodec codec force audio codec ('copy' to copy stream)<br> |
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-vol volume change audio volume (256=normal)<br> |
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-af filter_graph set audio filters<br> |
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Subtitle options:<br> |
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-s size set frame size<br> |
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-sn disable subtitle<br> |
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-scodec codec force subtitle codec ('copy' to copy stream)<br> |
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| Print help/info: | Description | |
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|:-------------------|:-------------------------------| |
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| --help topic | show help | |
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| -version | show version | |
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| -formats | show available formats | |
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| -muxers | show available muxers | |
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| -demuxers | show available demuxers | |
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| -devices | show available devices | |
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| -codecs | show available codecs | |
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| -decoders | show available decoders | |
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| -encoders | show available encoders | |
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| -protocols | show available protocols | |
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| -filters | show available filters | |
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| -pix_fmts | show available pixel formats | |
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| -sample_fmts | show available sample formats | |
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| -hwaccels | show available HW acceleration | |
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| Global options: | Description | |
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|:-------------------|:-------------------------------| |
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| -v loglevel | set logging level | |
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| -y | overwrite output files | |
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| -n | never overwrite output files | |
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| -filter_threads | number of filter threads | |
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| -vol volume | change audio volume(256=normal)| |
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| main options: | Description | |
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|:-------------------|:-------------------------------| |
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| -f fmt | force format | |
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| -c codec | codec name | |
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| -codec codec | codec name | |
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| -t duration | duration seconds of audio/video| |
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| -to time_stop | record or transcode stop time | |
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| -ss time_off | set the start time offset | |
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| -frames number | set the number of frames | |
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| -discard | discard | |
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| -disposition | disposition | |
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| Video options: | Description | |
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|:-------------------|:-------------------------------| |
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| -vframes number | set the number of video frames | |
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| -r rate | set frame rate (Hz value) | |
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| -s size | set frame size | |
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| -aspect aspect | set aspect ratio (4:3, 16:9) | |
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| -vn | disable video | |
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| -vcodec codec | force video codec | |
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| -vf filter_graph | set video filters | |
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| -ab bitrate | audio bitrate (please use -b:a)| |
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| -b bitrate | video bitrate (please use -b:v)| |
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| Audio options: | Description | |
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|:-------------------|:-------------------------------| |
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| -aframes number | set the number of audio frames | |
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| -aq quality | set audio quality | |
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| -ar rate | set audio sampling rate (in Hz)| |
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| -ac channels | set number of audio channels | |
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| -an | disable audio | |
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| -acodec codec | force audio codec | |
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| -vol volume | change audio volume(256=normal)| |
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| -af filter_graph | set audio filters | |
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命令行整体格式：以ffmpeg开头，参数之间用空格隔开，每个参数key以"-"开头，后面跟着参数value，输出文件放在命令行最后。<br> |
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@ -184,6 +183,9 @@ ffmpeg -ss 20 -accurate_seek -t 10 -i input.mp4 -an -r 5 %3d.jpg<br> |
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使用setpts设置视频速度，atempo设置音频速度：<br> |
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ffmpeg -i in.mp4 -filter_complex [0:v]setpts=%.2f*PTS[v];[0:a]atempo=%.2f[a] -map [v] -map [a] out.mp4<br> |
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### 3.12 旋转视频 |
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ffmpeg -i in.mp4 -c copy -metadata:s\:v:0 rotate=90 out.mp4<br> |
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# 二、ffplay命令行 |
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ffplay主要用于播放视频，也可以播放网络流，示例如下：<br> |
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ffplay -i beyond.mp4<br> |
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xufulong
3 years ago