Video transcoding extension, currently just supports changing the video container

core/command_builder.php

@@ -0,0 +1,65 @@
+<?php declare(strict_types=1);
+
+// Provides mechanisms for cleanly executing command-line applications
+// Was created to try to centralize a solution for whatever caused this:
+// quotes are only needed if the path to convert contains a space; some other times, quotes break things, see github bug #27
+class CommandBuilder
+{
+    private $executable;
+    private $args = [];
+    public $output;
+
+    function __construct(String $executable) {
+        if(empty($executable)) {
+            throw new InvalidArgumentException("executable cannot be empty");
+        }
+
+        $this->executable = $executable;
+    }
+
+    public function add_flag(string $value): void
+    {
+        $this->args[] = $value;
+    }
+
+    public function add_escaped_arg(string $value): void
+    {
+        $this->args[] = escapeshellarg($value);
+    }
+
+    public function generate(): string
+    {
+        $command = escapeshellarg($this->executable);
+        if(!empty($this->args)) {
+            $command .= " ";
+            $command .= join(" ", $this->args);
+        }
+
+        return escapeshellcmd($command)." 2>&1";
+    }
+
+    public function combineOutput(string $empty_output = ""): string
+    {
+        if(empty($this->output)) {
+            return $empty_output;
+        } else {
+            return implode("\r\n", $this->output);
+        }
+
+    }
+
+    public function execute(bool $fail_on_non_zero_return = false): int
+    {
+        $cmd = $this->generate();
+        exec($cmd, $this->output, $ret);
+
+        $output = $this->combineOutput("nothing");
+
+        log_debug('command_builder', "Command `$cmd` returned $ret and outputted $output");
+
+        if($fail_on_non_zero_return&&(int)$ret!==(int)0) {
+            throw new SCoreException("Command `$cmd` failed, returning $ret and outputting $output");
+        }
+        return $ret;
+    }
+}

core/imageboard/image.php

@@ -63,6 +63,9 @@ class Image
     /** @var boolean */
     public $video = null;
 
+    /** @var string */
+    public $video_codec = null;
+
     /** @var boolean */
     public $image = null;