ffmpeg参数说明
文章目录
为了查找方便,把ffmpeg中的参数都列出来
| 参数 | 英文说明 |
|---|---|
| -L | show license |
| -h | show help |
| -version | show version |
| -formats | 显示可以使用的格式,编码,协议 |
| -f | 强行设置输出格式[fmt] |
| -i | 输入文件名[filename] |
| -y | 不询问直接覆盖输出文件 |
| -map | set input stream mapping,file:stream[:syncfile:syncstream] |
| -map_meta_data | set meta data information of outfile from infile,outfile:infile |
| -t | set the recording time[duration] |
| -fs | set the limit file size［limit_size］ |
| -ss | set the start time offset[time_off] |
| -itsoffset | set the input ts offset[time_off] |
| -title | 视频文件标题[string] |
| -timestamp | set the timestamp[time] |
| -author | set the author[string] |
| -copyright | set the copyright[string] |
| -comment | set the comment[string] |
| -album | set the album[string] |
| -benchmark | add timings for benchmarking |
| -dump | dump each input packet |
| -hex | when dumping packets, also dump the payload |
| -re | read input at native frame rate |
| -loop_input | loop (current only works with images) |
| -loop_output | number of times to loop output in formats that support looping (0 loops forever) |
| -v | control amount of logging[verbose] |
| -target | specify target file type (”vcd”, “svcd”, “dvd”, “dv”, “dv50″, “pal-vcd”, “ntsc-svcd”, …)[type] |
| -threads | thread count[count] |
| -vsync | video sync method |
| -async | audio sync method |
| -vglobal | video global header storage type |
| -copyts | copy timestamps |
| -shortest | finish encoding within shortest input |
| -dts_delta_threshold | timestamp discontinuity delta threshold |
| 以下是视频相关的命令 | |
| -vframes | 按所提供的帧数对文件解码（例ffmpeg -i test5.flv -r 15 -s 384*288 -y -vframes 1 photos.flv）[num] |
| -aframes | set the number of audio frames to record[num] |
| -dframes | set the number of data frames to record[num] |
| -r | 设置帧速率,每秒多少帧 (Hz value, fraction or abbreviation)[rate] |
| -s | 设置视频的宽度和高度,格式为320×240,320*240,320:240都可以 |
| -aspect | set aspect ratio (4:3, 16:9 or 1.3333, 1.7777)[aspect] |
| -pix_fmt | set pixel format[format] |
| -croptop | set top crop band size (in pixels)[size] |
| -cropbottom | “set bottom crop band size (in pixels)[size] |
| -cropleft | set left crop band size (in pixels)[size] |
| -cropright | set right crop band size (in pixels)[size] |
| -padtop | set top pad band size (in pixels)[size] |
| -padbottom | set bottom pad band size (in pixels)［size］ |
| -padleft | set left pad band size (in pixels)［size］ |
| -padright | set right pad band size (in pixels)[size] |
| -padcolor | set color of pad bands (Hex 000000 thru FFFFFF)[color] |
| -intra | use only intra frames |
| -vn | disable video |
| -vdt | discard threshold[n] |
| -qscale | use fixed video quantizer scale (VBR)[q] |
| -qdiff | max difference between the quantizer scale (VBR)[q] |
| -rc_eq | set rate control equation[equation] |
| -rc_override | rate control override for specific intervals[override] |
| -vcodec | force video codec (’copy’ to copy stream)［codec］ |
| -me | set motion estimation method[method] |
| -me_threshold | motion estimaton threshold |
| -ps | set packet size in bits[size] |
| -strict | how strictly to follow the standards[strictness] |
| -sameq | use same video quality as source (implies VBR) |
| -pass | select the pass number (1 or 2)[n] |
| -passlogfile | select two pass log file name[filename] |
| -deinterlace | deinterlace pictures |
| -psnr | calculate PSNR of compressed frames |
| -vstats | dump video coding statistics to file |
| -vhook | insert video processing module[module] |
| -intra_matrix | specify intra matrix coeffs[matrix] |
| -inter_matrix | specify inter matrix coeffs[matrix] |
| -top | top=1/bottom=0/auto=-1 field first |
| -dc | intra_dc_precision[precision] |
| -vtag | force video tag/fourcc[fourcc/tag] |
| -newvideo | add a new video stream to the current output stream |
| -qphist | show QP histogram |
| 以下是音频相关的命令 | |
| -ab | 声音码流(in kbit/s)[bitrate] |
| -aq | 声音品质(codec-specific)[quality] |
| -ar | 声音的采样频率 (in Hz)[rate] |
| -ac | 设置输出的声道数[channels] |
| -an | 不输出声音 |
| -acodec | 设置输入声音的编码格式 (’copy’ to copy stream)[codec] |
| -atag | force audio tag/fourcc[fourcc/tag] |
| -vol | change audio volume (256=normal)[volume] |
| -newaudio | add a new audio stream to the current output stream |
| -alang | set the ISO 639 language code (3 letters) of the current audio stream[code] |
| 以下是字幕相关的命令 | |
| -scodec | force subtitle codec (’copy’ to copy stream)[codec] |
| -newsubtitle | add a new subtitle stream to the current output stream |
| -slang | set the ISO 639 language code (3 letters) of the current subtitle stream[code] |
| 以下是不常用的命令 | |
| -vd | set video grab device[device] |
| -vc | set video grab channel (DV1394 only)[channel] |
| -tvstd | set television standard (NTSC, PAL (SECAM))[standard] |
| -ad | set audio device[device] |
| -grab | request grabbing using[format] |
| -gd | set grab device[device] |
| -muxdelay | set the maximum demux-decode delay[sec] |
| -muxpreload | set the initial demux-decode delay[sec] |
| -absf | |
| -vbsf | |
| -default | generic catch all option |
(ffmpeg参数说明)：
| **【参数】** | **【说明】** | **【示例】** |
| -i "路径" | 指定需要转换的文件路径 | -i "C:\nba.wmv" |
| -y | 覆盖输出文件,即如果nba.xxx文件已经存在的话,直接覆盖 | |
| ** 控制画面参数** | ||
| -bitexac | 使用标准比特率 | |
| -vcodec xvid | 使用xvid压缩 | |
| -s <宽高比> | 指定分辨率大小 | -s 320*240 |
| -r <数值> | 帧速率(非标准数值会导致音画不同步【标准值为15或29.97】) | -r 15 |
| -b <比特率> | 指定压缩比特率 | -b 1500 |
| -qmin <数值> | 设定最小质量 | -qmin 10 |
| -qmax <数值> | 与-qmin相反,可以与-qmin同时使用 | -qmax 30 |
| -sameq | 使用与源视频相同的质量 | |
| ** 控制声音参数** | ||
| -acodec aac | 设定声音编码 | |
| -ac <数值> | 设定声道数：1为单声道,2为立体声 | -ac 2 |
| -ar <采样率> | 设定声音采样率(8000,11025,22050) | -ar 22050 |
| -ab <比特率> | 设定声音比特率(-ac设为立体声时要以一半比特率来设置,比如192kbps的就设成96) | -ab 96 |
| -vol <百分比> | 设定音量大小,比如设定200就会比原来的音量大2倍 | -vol 200 |
文章作者 古道
上次更新 2012-07-12