PHP使用ffmpeg压缩视频

PHP使用ffmpeg压缩视频

视频压缩可以有一下方式&＃xff1a;

1.压缩分辨率

例如视频的分辨率是720x1280&＃xff0c;可以压缩分辨率为360x640

2.压缩帧数

通过压缩视频的帧数来压缩&＃xff0c;可以压缩视频的帧数到1秒10帧甚至1秒5帧

3.压缩比特率

即压缩视频的码率&＃xff0c;要求不高的话可以压缩到700kb/s左右

4.压缩音频码率

压缩视频的音频码率&＃xff0c;一般可以压缩到128kb/s或者64kb/s

5.修改视频编码方式

现在普遍是H.264编码&＃xff0c;已经是最优编码

ffmpeg命令

1.查看视频信息

ffmpeg -i video.mp4

bitrate:1724kb/s就是比特率&＃xff0c;128kb/s就是音频的码率&＃xff0c;720x1280就是分辨率

2.压缩

我这边压缩视频的做法是只压缩比特率和分辨率&＃xff0c;这样对视频的影响最小

ffmpeg -i video.mp4 -s 360x640 -b:v 862k new.mp4

其中-s 360x640表示修改分辨率为360x640

其中-b:v 862k表示修改比特率为862kb/s

其中video.mp4为原视频

其中new.mp4为压缩后的视频地址

其他压缩命令&＃xff1a;

1.压缩帧数

ffmpeg -i video.mp4 -r 5 new.mp4

其中-r 5表示1秒5帧

2.压缩音频码率

ffmpeg -i video.mp4 -b:a 64k new.mp4

其中-b:a 64k表示音频码率为64k/s

3.修改编码方式

ffmpeg -i video.mp4 -vcodec libx264 new.mp4

其中-vcodec libx264表示H.264编码

上面的命令都是可以组合使用的&＃xff0c;找到符合需求的命令组合压缩视频即可。

PHP代码实现获取视频信息以及压缩&＃xff08;压缩的组合命令是分辨率和比特率&＃xff09;&＃xff1a;

/* 视频压缩 */
public function compressVideo($file, $file_name) {$file_content &＃61; file_get_contents($file);$compress_path &＃61; PUBLIC_PATH;$compress_file &＃61; $compress_path . $file_name . &＃39;.mp4&＃39;;$compress_after_file &＃61; $compress_path . $file_name . &＃39;_compress.mp4&＃39;;try{file_put_contents($compress_file, $file_content);$video_info;exec(FFMPEG_PATH . "ffmpeg -i {$compress_file} 2>&1", $video_info);$video_info &＃61; implode(&＃39; &＃39;, $video_info);$bitrate &＃61; &＃39;&＃39;; // 比特率$resolution &＃61; &＃39;&＃39;; // 分辨率if(preg_match("/Duration: (.*?), start: (.*?), bitrate: (\d*) kb\/s/", $video_info, $match)) {$bitrate &＃61; $match[3];}if(preg_match("/Video: (.*?), (.*?), (.*?)[,\s]/", $video_info, $match)) {$resolution &＃61; $match[3];}$file_size &＃61; filesize($compress_file);$file_size &＃61; intval($file_size / 1048576);if(empty($bitrate)) throwErr(&＃39;找不到比特率信息&＃39;);if(empty($resolution)) throwErr(&＃39;找不到分辨率信息&＃39;);if($file_size <10) throwErr(&＃39;视频大小不足10M&＃xff0c;不需要压缩&＃39;, null, 1100);$resolution &＃61; explode(&＃39;x&＃39;, $resolution);$bitrate_update &＃61; &＃39;&＃39;;$resolution_width_update &＃61; &＃39;&＃39;;$resolution_height_update &＃61; &＃39;&＃39;;$bitrate_update &＃61; $this->getVideoCompressBitrate($bitrate);$resolution_percent &＃61; 0;if($resolution[0] > $resolution[1]) {if($resolution[1] > 320) {$resolution_percent &＃61; $resolution[1] <&＃61; 520 ? 0.8 : 0.5;}}else {if($resolution[0] > 320) {$resolution_percent &＃61; $resolution[0] <&＃61; 520 ? 0.8 : 0.5;}}if($resolution_percent > 0) {$resolution_width_update &＃61; intval($resolution[0] * $resolution_percent);$resolution_height_update &＃61; intval($resolution[1] * $resolution_percent);}if(empty($bitrate_update) && empty($resolution_width_update)) throwErr(&＃39;比特率和分辨率同时不满足压缩条件&＃39;, null, 1100);$compress_bitrate &＃61; &＃39;&＃39;;$compress_resolution &＃61; &＃39;&＃39;;if(!empty($bitrate_update)) {$compress_bitrate &＃61; "-b:v {$bitrate_update}k";}if(!empty($resolution_width_update)) {$compress_resolution &＃61; "-s {$resolution_width_update}x{$resolution_height_update}";}$compress_exec &＃61; FFMPEG_PATH . "ffmpeg -i {$compress_file} %s% %v% {$compress_after_file}";$compress_exec &＃61; str_replace(array(&＃39;%s%&＃39;, &＃39;%v%&＃39;), array($compress_resolution, $compress_bitrate), $compress_exec);exec($compress_exec);unlink($compress_file);return array(&＃39;compress_file&＃39; &＃61;> $compress_after_file);}catch(\Exception $e) {unlink($compress_file);return array();}
}/* 获取视频压缩比特率 */
public function getVideoCompressBitrate($bitrate, $query_count &＃61; 0) {$bitrate_update &＃61; &＃39;&＃39;;if($bitrate >&＃61; 700) {if($bitrate <&＃61; 1000) {$bitrate_update &＃61; intval($bitrate * 0.8);}else {$bitrate_update &＃61; intval($bitrate * 0.5);}}if(empty($bitrate_update)) {return $query_count &＃61;&＃61; 0 ? $bitrate_update : $bitrate;}else {return $this->getVideoCompressBitrate($bitrate_update, &＃43;&＃43;$query_count);}
}

这里提供PHP获取视频的所有信息代码&＃xff1a;

$info &＃61; &＃39;&＃39;;
exec(FFMPEG_PATH . "ffmpeg -i {$compress_file} 2>&1", $info);$data &＃61; array();
if (preg_match("/Duration: (.*?), start: (.*?), bitrate: (\d*) kb\/s/", $info, $match)) {$data[&＃39;duration&＃39;] &＃61; $match[1]; //播放时间$arr_duration &＃61; explode(&＃39;:&＃39;, $match[1]);$data[&＃39;seconds&＃39;] &＃61; $arr_duration[0] * 3600 &＃43; $arr_duration[1] * 60 &＃43; $arr_duration[2]; //转换播放时间为秒数$data[&＃39;start&＃39;] &＃61; $match[2]; //开始时间$data[&＃39;bitrate&＃39;] &＃61; $match[3]; //码率(kb)
}
if (preg_match("/Video: (.*?), (.*?), (.*?)[,\s]/", $info, $match)) {$data[&＃39;vcodec&＃39;] &＃61; $match[1]; //视频编码格式$data[&＃39;vformat&＃39;] &＃61; $match[2]; //视频格式$data[&＃39;resolution&＃39;] &＃61; $match[3]; //视频分辨率$arr_resolution &＃61; explode(&＃39;x&＃39;, $match[3]);$data[&＃39;width&＃39;] &＃61; $arr_resolution[0];$data[&＃39;height&＃39;] &＃61; $arr_resolution[1];
}
if (preg_match("/Audio: (\w*), (\d*) Hz/", $info, $match)) {$data[&＃39;acodec&＃39;] &＃61; $match[1]; //音频编码$data[&＃39;asamplerate&＃39;] &＃61; $match[2]; //音频采样频率
}
if (isset($data[&＃39;seconds&＃39;]) && isset($data[&＃39;start&＃39;])) {$data[&＃39;play_time&＃39;] &＃61; $data[&＃39;seconds&＃39;] &＃43; $data[&＃39;start&＃39;]; //实际播放时间
}
return $data;