什么是FFmpeg？
FFmpeg是一个开源免费跨平台的视频和音频流方案，属于自由软件，采用LGPL或GPL许可证（依据你选择的组件）。它提供了录制、转换以及流化音视频的完整解决方案。它包含了非常先进的音频/视频编解码库libavcodec，为了保证高可移植性和编解码质量，libavcodec里很多codec都是从头开发的。
FFmpeg在Linux平台下开发，但它同样也可以在其它操作系统环境中编译运行，包括Windows、Mac OS X等。
这个项目最早由Fabrice Bellard发起，现在由Michael Niedermayer维护。许多FFmpeg的开发人员都来自MPlayer项目，而且当前FFmpeg也是放在MPlayer项目组的服务器上。项目的名称来自MPEG视频编码标准，前面的"FF“代表"Fast Forward“。更多详情》
/* 转视频 ??*/$cmd="ffmpeg.exe -i tiwer_update_move.avi -ab 56 -ar 22050 -b 500 -r 15 -s 500x600 201112120089123.flv"; ?
/* ?视频截图*/$cmd="ffmpeg.exe -itiwer_update_move.avi -f image2 -ss 10 -s 600*500 -vframes 1 201112120089123.jpg";exec($cmd);
生成缩略图
/* 生成缩略图 */$thumbnail = new ImageHelper(); ?$thumbnail->resizeimage("2012121208123.jpg", 30,30, 0, "2012121208123_small.jpg"); ?图片处理工具类如下：
ImageHelper.class.php/** * 图片处理工具 * * Project: BoBo Manage System * This is NOT a freeware, use is subject to license terms! * ?* Site: http://www.bobo123.cn * * $Id: ImageHelper.class.php 269 2011-03-08 00:44:01Z wgw8299 $ * * Copyright ? 2007-2012 Bobo123.CN Developer Team. All Rights Reserved. */class ImageHelper { ?????var $type; ???????????????/* 实际宽度 */ ????var $width; ??????????/* 实际高度 ?*/ ????var $height; ??????????/* 改变后的宽度 ??*/ ???var $resize_width; ??????????/* 改变后的高度 */ ?????var $resize_height; ??????????/* 是否裁图 ??*/ ???var $cut; ??????????/* 源图象 ?*/ ????var $srcimg; ??????????/* 目标图象地址 ?*/ ????var $dstimg; ??????????/* 临时创建的图象 ?*/ ????var $im; ???????function resizeimage($img, $wid, $hei,$c,$dstpath) { ????????????????$this->srcimg = $img; ?????????$this->resize_width = $wid; ?????????$this->resize_height = $hei; ?????????$this->cut = $c; ??????????????????/* 图片的类型 ?*/ ????????$this->type = strtolower(substr(strrchr($this->srcimg,"."),1)); ??????????????????/* 初始化图象 ?*/ ????????$this->initi_img(); ??????????????????/* 目标图象地址 ??*/ ???????$this -> dst_img($dstpath); ???????????????????????????$this->width = imagesx($this->im); ?????????$this->height = imagesy($this->im); ??????????????????/* 生成图象 ?*/ ???????$this->newimg(); ??????????????????ImageDestroy ($this->im); ?????} ???????function newimg() { ???????????/* 改变后的图象的比例 ?*/ ????????$resize_ratio = ($this->resize_width)/($this->resize_height); ???????????/* 实际图象的比例 */ ?????????$ratio = ($this->width)/($this->height); ?????????????if(($this->cut)=="1") { ?????????????/* 裁图高度优先 */ ?????????????if($ratio>=$resize_ratio){ ?????????????????$newimg = imagecreatetruecolor($this->resize_width,$this->resize_height); ?????????????????imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width,$this->resize_height, (($this->height)*$resize_ratio), $this->height); ?????????????????ImageJpeg ($newimg,$this->dstimg); ?????????????} ???????????????????????????????????????/* 裁图 宽度优先 ?*/ ????????????if($ratio<$resize_ratio) { ?????????????????$newimg = imagecreatetruecolor($this->resize_width,$this->resize_height); ?????????????????imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, $this->resize_height, $this->width, (($this->width)/$resize_ratio)); ?????????????????ImageJpeg ($newimg,$this->dstimg); ?????????????} ?????????} else { ?????????????????????/* 不裁图 ?*/ ????????????if($ratio>=$resize_ratio) { ?????????????????$newimg = imagecreatetruecolor($this->resize_width,($this->resize_width)/$ratio); ?????????????????imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, ($this->resize_width)/$ratio, $this->width, $this->height); ?????????????????ImageJpeg ($newimg,$this->dstimg); ?????????????} ?????????????if($ratio<$resize_ratio) { ?????????????????$newimg = imagecreatetruecolor(($this->resize_height)*$ratio,$this->resize_height); ?????????????????imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, ($this->resize_height)*$ratio, $this->resize_height, $this->width, $this->height); ?????????????????ImageJpeg ($newimg,$this->dstimg); ?????????????} ?????????} ?????} ???????/* 初始化图象 */ ?????function initi_img() { ?????????if($this->type=="jpg") { ?????????????$this->im = imagecreatefromjpeg($this->srcimg); ?????????} ??????????????????if($this->type=="gif") { ?????????????$this->im = imagecreatefromgif($this->srcimg); ?????????} ??????????????????if($this->type=="png") { ?????????????$this->im = imagecreatefrompng($this->srcimg); ?????????} ??????????????????if($this->type=="bmp") { ?????????????$this->im = $this->imagecreatefrombmp($this->srcimg); ?????????} ?????} ?????????/* 图象目标地址 ??*/ ???function dst_img($dstpath) { ?????????$full_length ?= strlen($this->srcimg); ?????????$type_length ?= strlen($this->type); ?????????$name_length ?= $full_length-$type_length; ?????????$name = substr($this->srcimg,0,$name_length-1); ?????????$this->dstimg = $dstpath; ?????} ??????????????????function ConvertBMP2GD($src, $dest = false) { ?????????if(!($src_f = fopen($src, "rb"))) { ?????????????return false; ?????????} ?????????if(!($dest_f = fopen($dest, "wb"))) { ?????????????return false; ?????????} ?????????$header = unpack("vtype/Vsize/v2reserved/Voffset", fread($src_f,14)); ?????????$info = unpack("Vsize/Vwidth/Vheight/vplanes/vbits/Vcompression/Vimagesize/Vxres/Vyres/Vncolor/Vimportant", fread($src_f, 40)); ??????????????????extract($info); ?????????extract($header); ??????????????????if($type != 0x4D42) { // signature "BM" ?????????????return false; ?????????} ??????????????????$palette_size = $offset - 54; ?????????$ncolor = $palette_size / 4; ?????????$gd_header = ""; ?????????// true-color vs. palette ?????????$gd_header .= ($palette_size == 0) ? "\xFF\xFE" : "\xFF\xFF"; ?????????$gd_header .= pack("n2", $width, $height); ?????????$gd_header .= ($palette_size == 0) ? "\x01" : "\x00"; ?????????if($palette_size) { ?????????????$gd_header .= pack("n", $ncolor); ?????????} ?????????????????$gd_header .= "\xFF\xFF\xFF\xFF"; ???????????fwrite($dest_f, $gd_header); ???????????if($palette_size) { ?????????????$palette = fread($src_f, $palette_size); ?????????????$gd_palette = ""; ?????????????$j = 0; ?????????????while($j < $palette_size) { ?????????????????$b = $palette{$j++}; ?????????????????$g = $palette{$j++}; ?????????????????$r = $palette{$j++}; ?????????????????$a = $palette{$j++}; ?????????????????$gd_palette .= "$r$g$b$a"; ?????????????} ?????????????$gd_palette .= str_repeat("\x00\x00\x00\x00", 256 - $ncolor); ?????????????fwrite($dest_f, $gd_palette); ?????????} ???????????$scan_line_size = (($bits * $width) + 7) >> 3; ?????????$scan_line_align = ($scan_line_size & 0x03) ? 4 - ($scan_line_size & ?????????0x03) : 0; ???????????for($i = 0, $l = $height - 1; $i < $height; $i++, $l--) { ?????????????// BMP stores scan lines starting from bottom ?????????????fseek($src_f, $offset + (($scan_line_size + $scan_line_align) * $l)); ?????????????$scan_line = fread($src_f, $scan_line_size); ?????????????if($bits == 24) { ?????????????????$gd_scan_line = ""; ?????????????????$j = 0; ?????????????????while($j < $scan_line_size) { ?????????????????????$b = $scan_line{$j++}; ?????????????????????$g = $scan_line{$j++}; ?????????????????????$r = $scan_line{$j++}; ?????????????????????$gd_scan_line .= "\x00$r$g$b"; ?????????????????} ?????????????} ?????????????else if($bits == 8) { ?????????????????$gd_scan_line = $scan_line; ?????????????} ?????????????else if($bits == 4) { ?????????????????$gd_scan_line = ""; ?????????????????$j = 0; ?????????????????while($j < $scan_line_size) { ?????????????????????$byte = ord($scan_line{$j++}); ?????????????????????$p1 = chr($byte >> 4); ?????????????????????$p2 = chr($byte & 0x0F); ?????????????????????$gd_scan_line .= "$p1$p2"; ?????????????????} ?????????????????$gd_scan_line = substr($gd_scan_line, 0, $width); ?????????????} ?????????????else if($bits == 1) { ?????????????????$gd_scan_line = ""; ?????????????????$j = 0; ?????????????????while($j < $scan_line_size) { ?????????????????????$byte = ord($scan_line{$j++}); ?????????????????????$p1 = chr((int) (($byte & 0x80) != 0)); ?????????????????????$p2 = chr((int) (($byte & 0x40) != 0)); ?????????????????????$p3 = chr((int) (($byte & 0x20) != 0)); ?????????????????????$p4 = chr((int) (($byte & 0x10) != 0)); ?????????????????????$p5 = chr((int) (($byte & 0x08) != 0)); ?????????????????????$p6 = chr((int) (($byte & 0x04) != 0)); ?????????????????????$p7 = chr((int) (($byte & 0x02) != 0)); ?????????????????????$p8 = chr((int) (($byte & 0x01) != 0)); ?????????????????????$gd_scan_line .= "$p1$p2$p3$p4$p5$p6$p7$p8"; ?????????????????} ?????????????????$gd_scan_line = substr($gd_scan_line, 0, $width); ?????????????} ?????????????fwrite($dest_f, $gd_scan_line); ?????????} ?????????fclose($src_f); ?????????fclose($dest_f); ?????????return true; ?????} ???????function imagecreatefrombmp($filename) { ?????????$tmp_name = tempnam("/tmp", "GD"); ?????????if($this->ConvertBMP2GD($filename, $tmp_name)) { ?????????????$img = imagecreatefromgd($tmp_name); ?????????????unlink($tmp_name); ?????????????return $img; ?????????} ?????????return false; ?????} ???????????}软件下载
FFmpeg官方下载：http://ffmpeg.org/download.html
- 原始视频文件路径：
水印图片路径：水印位置：（x,y)=(输出文件路径：FFmpeg + php 视屏转换
原文地址：https://www.cnblogs.com/5aiQ/p/9457794.html