Don’t allow input stream to be probed as they then get consumed

Author: rhodgkins

lib/processor.js

@@ -21,7 +21,12 @@ var nlRegexp = /\r\n|\r|\n/g;
  * @private
  */
 function runFfprobe(command) {
-  command.ffprobe(0, function(err, data) {
+  const inputProbeIndex = 0;
+  if (command._inputs[inputProbeIndex].isStream) {
+    // Don't probe input streams as this will consume them
+    return;
+  }
+  command.ffprobe(inputProbeIndex, function(err, data) {
     command._ffprobeData = data;
   });
 }