Chroma is used in the last steps of the subpixel refinement by default. For a slight speed increase, this can be disabled (at the cost of quality). –8x8dct (x264) -flags2 +dct8x8(FFmpeg) Gives a notable quality boost by allowing x264 to choose between 8×8 and 4×4 frequency tra...
speed_t cfgetispeed(const struct termios *); speed_t cfgetospeed(const struct termios *); int cfsetispeed(struct termios *, speed_t speed); int cfsetospeed(struct termios *, speed_t speed); 7. 其他函数 #include <termios.h> int tcdrain(int fd); int tcflow(int fd, int flowtype); i...
--enable-shared build shared libraries [no] --enable-small optimize for size instead of speed --disable-runtime-cpudetect disable detecting cpu capabilities at runtime (smaller binary) --enable-gray enable full grayscale support (slower color) --disable-swscale-alpha disable alpha channel suppor...
FFmpeg allows you to adjust video playback speed. To increase the video playback speed, just run ffmpeg -i -vf "setpts=0.5*PTS" This command will double the speed of the video. To slow down your video you need to use a parameter greater than1, like ffmpeg -i -vf "setpts=4.0*...
--enable-raise-major increase major version numbers in sonames [no] 程序选项,每个选项对应一个可单独执行的程序,可选择编译还是不编译, Program options: --disable-programs do not build command line programs --disable-ffmpeg disable ffmpeg build ...
此命令使用libx264编解码器，-r 5可减少所用时间。-tune fastdecode -preset ultrafast也可用于更快的...
9, 0 decrease and increase volume respectively 减少量和增加量 /, * decrease and increase volume respectively 减少量和增加量 a cycle audio channel in the current program 循环当前程序中的音频通道 v cycle video channel 循环视频信道 t cycle subtitle channel in the current program 循环当前程序中的字...
12. How to Adjust Video Speed with FFmpeg To increase video playback speed, run the following command with the-vfoption, which sets the video filters that help to adjust the playback speed. ffmpeg -i video.mpg -vf "setpts=0.5*PTS" highspeed.mpg ...
FFmpeg allows you to adjust the video playback speed. To increase the video playback speed, run: $ ffmpeg -i input.mp4 -vf "setpts=0.5*PTS" output.mp4 The command will double the speed of the video. To slow down your video, you need to use a multipliergreater than1. To decrease pl...
首先登陆FFmpeg的官方网站https://ffmpeg.org/,打开下载地址:https://ffmpeg.org/download.html#get-sources,在页面的“more releases”段落里,可以看到多个版本的FFmpeg源代码。我用的版本是 3.2.12 ,代号”Hypatia”。 下载完成后拷贝到Ubuntu虚拟机中。