Add proper catch for ISE in video thumb extractor.

app/src/main/java/org/thoughtcrime/securesms/video/videoconverter/VideoThumbnailsExtractor.java

@@ -161,7 +161,14 @@ final class VideoThumbnailsExtractor {
         }
       }
 
-      int outputBufIndex = decoder.dequeueOutputBuffer(info, TIMEOUT_USEC);
+      final int outputBufIndex;
+      try {
+        outputBufIndex = decoder.dequeueOutputBuffer(info, TIMEOUT_USEC);
+      } catch (IllegalStateException e) {
+        Log.w(TAG, "Decoder not in the Executing state, or codec is configured in asynchronous mode.", e);
+        throw new TranscodingException("Decoder not in the Executing state, or codec is configured in asynchronous mode.", e);
+      }
+
       if (outputBufIndex >= 0) {
         if ((info.flags & MediaCodec.BUFFER_FLAG_END_OF_STREAM) != 0) {
           outputDone = true;

video/src/main/java/org/thoughtcrime/securesms/video/videoconverter/TranscodingException.java

@@ -9,4 +9,8 @@ final class TranscodingException extends Exception {
   TranscodingException(Throwable inner) {
     super(inner);
   }
+
+  TranscodingException(String message, Throwable inner) {
+    super(message, inner);
+  }
 }