ffmpeg进度条 - PHP中的编码百分比

时间:2012-07-11 21:08:36

标签: php regex parsing ffmpeg

我用PHP编写了一个完整的系统,并在服务器上使用bash在我的VPS上转换和流式传输HTML5中的视频。转换由ffmpeg在后台完成,内容输出到 block.txt

查看了以下帖子:

Can ffmpeg show a progress bar?

ffmpeg video encoding progress bar

除其他外,我找不到一个有效的例子。

我需要以百分比的形式获取当前编码的进度。

我上面链接的第一篇帖子提供了:

$log = @file_get_contents('block.txt');

preg_match("/Duration:([^,]+)/", $log, $matches);
list($hours,$minutes,$seconds,$mili) = split(":",$matches[1]);
$seconds = (($hours * 3600) + ($minutes * 60) + $seconds);
$seconds = round($seconds);

$page = join("",file("$txt"));
$kw = explode("time=", $page);
$last = array_pop($kw);
$values = explode(' ', $last);
$curTime = round($values[0]);
$percent_extracted = round((($curTime * 100)/($seconds)));

echo $percent_extracted;

$ percent_extracted变量回显零,因为数学不是我的强项,我真的不知道如何在这里取得进展。

这是来自block.txt的ffmpeg输出的一行(如果它有用)

  

时间= 00:19:25.16比特率= 823.0kbits / s帧= 27963 fps = 7 q = 0.0 size =   117085kB时间= 00:19:25.33比特率= 823.1kbits / s帧= 27967 fps = 7   q = 0.0 size = 117085kB time = 00:19:25.49 bitrate = 823.0kbits / s   帧= 27971 fps = 7 q = 0.0 size = 117126kB

请帮我输出这个百分比,一旦完成,我可以创建自己的进度条。感谢。

3 个答案:

答案 0 :(得分:42)

好的,我已经找到了我需要的东西 - 希望这对其他人也有帮助!

首先,您希望将ffmpeg数据输出到服务器上的文本文件中。

ffmpeg -i path/to/input.mov -vcodec videocodec -acodec audiocodec path/to/output.flv 1> block.txt 2>&1

因此,ffmpeg输出是block.txt。现在在PHP中,让我们这样做!

$content = @file_get_contents('../block.txt');

if($content){
    //get duration of source
    preg_match("/Duration: (.*?), start:/", $content, $matches);

    $rawDuration = $matches[1];

    //rawDuration is in 00:00:00.00 format. This converts it to seconds.
    $ar = array_reverse(explode(":", $rawDuration));
    $duration = floatval($ar[0]);
    if (!empty($ar[1])) $duration += intval($ar[1]) * 60;
    if (!empty($ar[2])) $duration += intval($ar[2]) * 60 * 60;

    //get the time in the file that is already encoded
    preg_match_all("/time=(.*?) bitrate/", $content, $matches);

    $rawTime = array_pop($matches);

    //this is needed if there is more than one match
    if (is_array($rawTime)){$rawTime = array_pop($rawTime);}

    //rawTime is in 00:00:00.00 format. This converts it to seconds.
    $ar = array_reverse(explode(":", $rawTime));
    $time = floatval($ar[0]);
    if (!empty($ar[1])) $time += intval($ar[1]) * 60;
    if (!empty($ar[2])) $time += intval($ar[2]) * 60 * 60;

    //calculate the progress
    $progress = round(($time/$duration) * 100);

    echo "Duration: " . $duration . "<br>";
    echo "Current Time: " . $time . "<br>";
    echo "Progress: " . $progress . "%";

}

这将输出剩余的时间百分比。

你可以把它作为回显到页面的唯一文本片段,从另一个页面你可以使用jQuery执行AJAX请求来获取这段文本并将其输出到div中,例如,更新为您的页面每10秒钟一次。 :)

答案 1 :(得分:5)

ffmpeg现在有一个进度选项,可以更容易地解析输出。

  

ffmpeg -progress block.txt -i path / to / input.mov -vcodec videocodec -acodec audiocodec path / to / output.flv 2&gt;&amp; 1

在你开始编码之前你可以得到总帧数和其他很多信息(这是用bash做的。我是一个Perl程序员所以我不知道你是怎么得到的信息到PHP脚本中。)

  

eval $(ffprobe -of flat = s = _ -show_entries stream = height,width,nb_frames,duration,codec_name path / to / input.mov);

  宽度= $ {streams_stream_0_width};
  高度= $ {streams_stream_0_height};
  帧= $ {streams_stream_0_nb_frames};
  videoduration = $ {streams_stream_0_duration};
  audioduration = $ {streams_stream_1_duration};
  编解码器= $ {streams_stream_0_codec_name};
  echo $ width,$ height,$ frames,$ videoduration,$ audioduration,$ codec;

-of flate = s = _表示将每个name = value放在一个单独的行上。 -show_entries告诉它显示以下条目(-show_streams的流,-show_format的格式等)stream = ...表示从-show_streams输出中显示这些项目。请尝试以下方法查看可用内容:

  

ffprobe -show_streams path / to / input.mov

进度文件的输出大约每秒添加一次。编码完成后,内容如下所示。在我的脚本中,每隔一秒我将文件放入一个数组,然后以相反的顺序遍历数组,只使用第一个[最后一个反转之前]两个“进度”行之间的内容,以便我使用文件末尾的最新信息。可能有更好的方法。这是来自没有音频的mp4,因此只有一个流。

  

框= 86个
  FPS = 0.0
  stream_0_0_q = 23.0
  TOTAL_SIZE = 103173
  out_time_ms = 1120000
  Out_time相当= 00:00:01.120000
  dup_frames = 0
  drop_frames = 0
  进度=继续
  帧= 142
  FPS = 140.9
  stream_0_0_q = 23.0
  TOTAL_SIZE = 415861
  out_time_ms = 3360000
  Out_time相当= 00:00:03.360000
  dup_frames = 0
  drop_frames = 0
  进度=继续
  帧= 185
  FPS = 121.1
  stream_0_0_q = 23.0
  TOTAL_SIZE = 1268982
  out_time_ms = 5080000
  Out_time相当= 00:00:05.080000
  dup_frames = 0
  drop_frames = 0
  进度=继续
  帧= 225
  FPS = 110.9
  stream_0_0_q = 23.0
  TOTAL_SIZE = 2366000
  out_time_ms = 6680000
  Out_time相当= 00:00:06.680000
  dup_frames = 0
  drop_frames = 0
  进度=继续
  帧= 262
  FPS = 103.4
  stream_0_0_q = 23.0
  TOTAL_SIZE = 3810570
  out_time_ms = 8160000
  Out_time相当= 00:00:08.160000
  dup_frames = 0
  drop_frames = 0
  进度=继续
  帧= 299
  FPS = 84.9
  stream_0_0_q = -1.0
  TOTAL_SIZE = 6710373
  out_time_ms = 11880000
  Out_time相当= 00:00:11.880000
  dup_frames = 0
  drop_frames = 0
  进度=端

答案 2 :(得分:1)

如果javascript更新了您的进度条,javascript可以“直接”执行第2步:

[此示例需要dojo]


1 php:开始转换并将状态写入文本文件 - 示例语法:

exec("ffmpeg -i path/to/input.mov path/to/output.flv 1>path/to/output.txt 2>&1");

对于第二部分,我们需要只需javascript 来读取文件。 以下示例使用dojo.request进行AJAX,但您可以使用jQuery或vanilla或其他任何内容:

[2] js:从文件中获取进度:

var _progress = function(i){
    i++;
    // THIS MUST BE THE PATH OF THE .txt FILE SPECIFIED IN [1] : 
    var logfile = 'path/to/output.txt';

/* (example requires dojo) */

request.post(logfile).then( function(content){
// AJAX success
    var duration = 0, time = 0, progress = 0;
    var result = {};

    // get duration of source
    var matches = (content) ? content.match(/Duration: (.*?), start:/) : [];
    if( matches.length>0 ){
        var rawDuration = matches[1];
        // convert rawDuration from 00:00:00.00 to seconds.
        var ar = rawDuration.split(":").reverse();
        duration = parseFloat(ar[0]);
        if (ar[1]) duration += parseInt(ar[1]) * 60;
        if (ar[2]) duration += parseInt(ar[2]) * 60 * 60;

        // get the time 
        matches = content.match(/time=(.*?) bitrate/g);
        console.log( matches );

        if( matches.length>0 ){
            var rawTime = matches.pop();
            // needed if there is more than one match
            if (lang.isArray(rawTime)){ 
                rawTime = rawTime.pop().replace('time=','').replace(' bitrate',''); 
            } else {
                rawTime = rawTime.replace('time=','').replace(' bitrate','');
            }

            // convert rawTime from 00:00:00.00 to seconds.
            ar = rawTime.split(":").reverse();
            time = parseFloat(ar[0]);
            if (ar[1]) time += parseInt(ar[1]) * 60;
            if (ar[2]) time += parseInt(ar[2]) * 60 * 60;

            //calculate the progress
            progress = Math.round((time/duration) * 100);
        }

        result.status = 200;
        result.duration = duration;
        result.current  = time;
        result.progress = progress;

        console.log(result);

        /* UPDATE YOUR PROGRESSBAR HERE with above values ... */

        if(progress==0 && i>20){
            // TODO err - giving up after 8 sec. no progress - handle progress errors here
            console.log('{"status":-400, "error":"there is no progress while we tried to encode the video" }'); 
            return;
        } else if(progress<100){ 
            setTimeout(function(){ _progress(i); }, 400);
        }
    } else if( content.indexOf('Permission denied') > -1) {
        // TODO - err - ffmpeg is not executable ...
        console.log('{"status":-400, "error":"ffmpeg : Permission denied, either for ffmpeg or upload location ..." }');    
    } 
},
function(err){
// AJAX error
    if(i<20){
        // retry
        setTimeout(function(){ _progress(0); }, 400);
    } else {
        console.log('{"status":-400, "error":"there is no progress while we tried to encode the video" }');
        console.log( err ); 
    }
    return; 
});
}
setTimeout(function(){ _progress(0); }, 800);