ffmpeg的操作参数

ffmpeg 常用命令汇总_kingvon_liwei的博客-CSDN博客_ffmpeg
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 #显示可用格式
-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
-dispositions show available stream dispositions
-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 #设置日志级别
-v loglevel set logging level
-report generate a report
-max_alloc bytes set maximum size of a single allocated block
-y overwrite output files #全局的意思，全局覆盖输出文件
-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 decoding errors (0.0: no errors, 1.0: 100% errors) above which ffmpeg returns an error instead of success.
-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)#设置帧速率（赫兹值、分数或缩写)
-fpsmax rate set max 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)
-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

-async 1

Audio sync method. "Stretches/squeezes" the audio
stream to match the timestamps, the parameter is
the maximum samples per second by which the audio
is changed. -async 1 is a special case where only
the start of the audio stream is corrected without
any later correction.Note that the timestamps may be further modified
by the muxer, after this. For example, in the
case that the format option avoid_negative_ts
is enabled.This option has been deprecated. Use the aresample
audio filter instead.

音频同步方法。“拉伸/挤压”音频流以匹配时间戳，该参数是每秒更改音频的最大采样数-async 1是一种特殊情况，在这种情况下，只纠正音频流的开头，而不进行任何后续纠正。
注意，在此之后，时间戳可由muxer进一步修改。例如，如果启用了格式选项“avoid_negative_ts”。
此选项已被弃用。改用aresample音频过滤器。

ffmpeg拼接图像

我们经常将两个视频拼接起来做对比，需要用到2宫格

 ffmpeg -re -i result_voice_pfpth_00315.mp4
-re -i result_voice_wav2lip.mp4
-filter_complex
"nullsrc=size=450x224[base];
[0:v] setpts=PTS-STARTPTS,scale=224x224 [upperleft];
[1:v] setpts=PTS-STARTPTS,scale=224x224 [upperright];
[base][upperleft] overlay=shortest=1[tmp1];
[tmp1][upperright] overlay=shortest=1:x=224"  output.mp4

画布大小为450x224,宽为450，高为224，原来视频大小都是224x224,

[0:V]将其缩放到224x224大小，然后放在upperleft。

[1:V]缩放为224x224，然后放在upperright

[base][upperleft]拼接成为[tmp1] 默认放在(0,0)的位置

[tmp1][upperright]拼接成为最终结果，放在(x=224,y=0)的地方，y没指定默认为0

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