diff --git a/signbank/dictionary/management/commands/rename_non_mp4_extensions.py b/signbank/dictionary/management/commands/rename_non_mp4_extensions.py
new file mode 100644
index 000000000..ceeaf0ddf
--- /dev/null
+++ b/signbank/dictionary/management/commands/rename_non_mp4_extensions.py
@@ -0,0 +1,97 @@
+"""Convert gloss videos to mp4."""
+
+import os
+import shutil
+from django.core.management.base import BaseCommand
+from django.core.exceptions import *
+from signbank.settings.server_specific import WRITABLE_FOLDER, GLOSS_VIDEO_DIRECTORY, BACKUP_VIDEOS_FOLDER
+from signbank.dictionary.models import Dataset, Gloss
+from signbank.video.models import GlossVideo, GlossVideoNME, GlossVideoPerspective
+from signbank.dataset_checks import gloss_backup_videos, rename_backup_videos
+
+
+def get_two_letter_dir(idgloss):
+    foldername = idgloss[:2]
+
+    if len(foldername) == 1:
+        foldername += '-'
+
+    return foldername
+
+
+def gloss_video_non_mp4_filename_check(dataset):
+
+    non_mp4_videos = []
+
+    default_language = dataset.default_language
+
+    all_glosses = Gloss.objects.filter(lemma__dataset=dataset,
+                                       lemma__lemmaidglosstranslation__language=default_language).order_by(
+        'lemma__lemmaidglosstranslation__text').distinct()
+    for gloss in all_glosses:
+        glossvideos = GlossVideo.objects.filter(gloss=gloss,
+                                                glossvideonme=None,
+                                                glossvideoperspective=None).order_by('version')
+        version_0_videos = glossvideos.filter(version=0)
+        mp4_pattern = '.mp4'
+        mp4_in_filename = [gv for gv in version_0_videos if not str(gv.videofile).endswith(mp4_pattern)]
+        if mp4_in_filename:
+            non_mp4_videos.append((gloss, mp4_in_filename))
+
+    return non_mp4_videos
+
+
+def rename_extension_videos(gloss, glossvideos):
+
+    idgloss = gloss.idgloss
+    two_letter_dir = get_two_letter_dir(idgloss)
+    dataset_dir = gloss.lemma.dataset.acronym
+    desired_filename_without_extension = idgloss + '-' + str(gloss.id)
+    for inx, gloss_video in enumerate(glossvideos, 0):
+        _, bak = os.path.splitext(gloss_video.videofile.name)
+        desired_extension = '.mp4'
+        current_version = gloss_video.version
+        if current_version > 0:
+            continue
+        desired_filename = desired_filename_without_extension + desired_extension
+        current_relative_path = str(gloss_video.videofile)
+        if bak == desired_extension:
+            continue
+        source = os.path.join(WRITABLE_FOLDER, current_relative_path)
+        destination = os.path.join(WRITABLE_FOLDER, GLOSS_VIDEO_DIRECTORY,
+                                   dataset_dir, two_letter_dir, desired_filename)
+        print('rename_extension_videos move ', source, destination)
+        # os.rename(source, destination)
+        # gloss_video.videofile.name = desired_filename
+        # gloss_video.save()
+
+
+class Command(BaseCommand):
+    help = 'Rename gloss backup videos that have bak sequences.'
+
+    def add_arguments(self, parser):
+        parser.add_argument('dataset-acronym', nargs='+', type=str)
+
+    def handle(self, *args, **kwargs):
+        if 'dataset-acronym' in kwargs:
+            for dataset_acronym in kwargs['dataset-acronym']:
+                try:
+                    dataset = Dataset.objects.get(acronym=dataset_acronym)
+                    backup_videos = gloss_video_non_mp4_filename_check(dataset)
+                    # use a separate variable because we are going to filter out objects without a file
+                    gloss_videos_to_move = backup_videos
+                    checked_gloss_videos = []
+                    for gloss, glossvideos in gloss_videos_to_move:
+                        gloss_video_objects = glossvideos
+                        checked_videos_for_gloss = []
+                        for gloss_video in gloss_video_objects:
+                            source = os.path.join(WRITABLE_FOLDER, str(gloss_video.videofile))
+                            if not os.path.exists(source):
+                                # skip non-existent files, don't put them in enumeration list
+                                continue
+                            checked_videos_for_gloss.append(gloss_video)
+                        checked_gloss_videos.append((gloss, checked_videos_for_gloss))
+                    for gloss, glossvideos in checked_gloss_videos:
+                        rename_extension_videos(gloss, glossvideos)
+                except ObjectDoesNotExist as e:
+                    print("Dataset '{}' not found.".format(dataset_acronym), e)