我想使用 proc_open 使用 ffmpeg 從視頻中讀取每一幀，然后使用 PHP 對幀進行處理。下面是相反的示例 - 它從 PHP 逐幀發送到 ffmpeg：$descriptors = array( 0 => array("pipe", "r"), 1 => array("pipe", "w"), 2 => array("file", "C:/error-output.txt", "a") );$frames = glob('Q:/images/*.jpg');$command = "ffmpeg -f image2pipe -pix_fmt rgb24 -framerate 10 -c:v mjpeg -i - ". "-r 10 -vcodec libx264 -pix_fmt yuv420p -preset faster -crf 17 ". "-y test.mp4";$ffmpeg = proc_open($command, $descriptors, $pipes);if (!is_resource($ffmpeg)){ die('Could not run ffmpeg');}foreach ($frames AS $frame){ fwrite($pipes[0], file_get_contents($frame) );}fclose($pipes[0]);這就是我正在嘗試但無法正確完成的方式：$descriptors = array( 0 => array("pipe", "r"), 1 => array("pipe", "w"), write to 2 => array("file", "C:/error-output.txt", "a") );$command = "ffmpeg -i 1.gif -ss 00:00:3 -s 650x390 -vframes 100 -c:v png -f image2pipe -";$ffmpeg = proc_open($command, $descriptors, $pipes);if (!is_resource($ffmpeg)){ die('Could not run ffmpeg');}while (!feof($pipes[1])){ $frame = fread($pipes[1], 5000);}fclose($pipes[1]);最大的問題是我不知道要從 ffmpeg 讀取多少數據才能獲得整個幀。
1 回答
明月笑刀無情
TA貢獻1828條經驗 獲得超4個贊
$descriptors = array(
0 => array("pipe", "r"),
1 => array("pipe", "w"),
2 => array("file", "C:/path/error-output.txt", "a")
);
$command = 'ffmpeg -i INPUT.mp4 -ss 00:00:10 -t 120 -c:v png -f image2pipe -compression_level 0 -';
$ffmpeg = proc_open($command, $descriptors, $pipes);
if (!is_resource($ffmpeg))
{
die('Could not run ffmpeg');
}
$k = 0;
$buff = '';
$blend = 0;
while (!feof($pipes[1]))
{
$buff .= fread($pipes[1], 50000);
$pos = strpos($buff, chr(137).'PNG', 1);
if ($pos !== false)
{
$frame = substr($buff, 0, $pos);
$buff = substr($buff, $pos);
handleFrame($frame, $k);
$k++;
}
}
handleFrame($buff, $k);
fclose($pipes[0]);
fclose($pipes[1]);
function handleFrame(&$str, $num)
{
$im = imagecreatefromstring($str);
...
}
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