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fix(preview): ffmpeg gets stuck when getting video cover #45722

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fix(preview): ffmpeg gets stuck when getting video cover #45722

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4f7e5c7
fix(preview): ffmpeg gets stuck when getting video cover
ncheng89 Jun 8, 2024
0e2412d
Improved the command to get the cover
ncheng89 Jun 13, 2024
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109 changes: 80 additions & 29 deletions lib/private/Preview/Movie.php
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Original file line number Diff line number Diff line change
Expand Up @@ -96,55 +96,106 @@ public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage {

return $result;
}

private function generateThumbNail(int $maxX, int $maxY, string $absPath, int $second): ?IImage {
$tmpPath = \OC::$server->getTempManager()->getTemporaryFile();

$binaryType = substr(strrchr($this->binary, '/'), 1);
$cmd = $this->buildCommand($binaryType, $second, $absPath, $tmpPath);

if (!$cmd) {
unlink($tmpPath);
return null;
}

$proc = proc_open($cmd, [1 => ['pipe', 'w'], 2 => ['pipe', 'w']], $pipes);
if (!is_resource($proc)) {
unlink($tmpPath);
return null;
}

$output = $this->processPipes($pipes);
$status = proc_get_status($proc);

if ($status['running']) {
proc_terminate($proc, 9); // SIGKILL
}

$returnCode = proc_close($proc);

if ($returnCode === 0) {
return $this->handleSuccessfulThumbnailCreation($tmpPath, $maxX, $maxY);
}

$this->logError($second, $output);
unlink($tmpPath);
return null;
}

private function buildCommand(string $binaryType, int $second, string $absPath, string $tmpPath): ?array {
if ($binaryType === 'avconv') {
$cmd = [$this->binary, '-y', '-ss', (string)$second,
$cmd = [
$this->binary, '-y', '-ss', (string)$second,
'-i', $absPath,
'-an', '-f', 'mjpeg', '-vframes', '1', '-vsync', '1',
$tmpPath];
$tmpPath
];
} elseif ($binaryType === 'ffmpeg') {
$cmd = [$this->binary, '-y', '-ss', (string)$second,
$cmd = [
$this->binary, '-y', '-ss', (string)$second,
'-i', $absPath,
'-f', 'mjpeg', '-vframes', '1',
$tmpPath];
$tmpPath
];
} else {
// Not supported
unlink($tmpPath);
return null;
}
return $cmd;
}

$proc = proc_open($cmd, [1 => ['pipe', 'w'], 2 => ['pipe', 'w']], $pipes);
$returnCode = -1;
private function processPipes(array $pipes): string {
$output = "";
if (is_resource($proc)) {
$stdout = trim(stream_get_contents($pipes[1]));
$stderr = trim(stream_get_contents($pipes[2]));
$returnCode = proc_close($proc);
$output = $stdout . $stderr;
$endTime = time() + 10;

foreach ([1, 2] as $pipeNum) {
stream_set_blocking($pipes[$pipeNum], false);
stream_set_timeout($pipes[$pipeNum], 10);

while (!feof($pipes[$pipeNum])) {
$chunk = fread($pipes[$pipeNum], 8192);
if ($chunk === false || $chunk === "") {
$info = stream_get_meta_data($pipes[$pipeNum]);
if ($info['timed_out'] || $info['eof']) {
break;
}
if (time() > $endTime) {
break;
}
usleep(10000);
} else {
$output .= $chunk;
}
}
fclose($pipes[$pipeNum]);
}

if ($returnCode === 0) {
$image = new \OCP\Image();
$image->loadFromFile($tmpPath);
if ($image->valid()) {
unlink($tmpPath);
$image->scaleDownToFit($maxX, $maxY);
return $output;
}

return $image;
}
}

if ($second === 0) {
$logger = \OC::$server->get(LoggerInterface::class);
$logger->info('Movie preview generation failed Output: {output}', ['app' => 'core', 'output' => $output]);
}

unlink($tmpPath);
private function handleSuccessfulThumbnailCreation(string $tmpPath, int $maxX, int $maxY): ?IImage {
$image = new \OCP\Image();
$image->loadFromFile($tmpPath);
if ($image->valid()) {
unlink($tmpPath);
$image->scaleDownToFit($maxX, $maxY);
return $image;
}
return null;
}

private function logError(int $second, string $output): void {
$logger = \OC::$server->get(LoggerInterface::class);
$logger->info('Thumbnail generation failed at second {second}. Output: {output}', ['app' => 'core', 'second' => $second, 'output' => $output]);
}

}
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