diff --git a/Changelog.txt b/Changelog.txt
index 22c4a8f10..370325d0a 100644
--- a/Changelog.txt
+++ b/Changelog.txt
@@ -12,6 +12,7 @@
    * Add "Toggle custom surround text with" shortcut - thx HadiSparrow
    * Add "Go to next/previous time code from video position" shortcuts - thx faon-92
    * Add option to change search engine in "Spell check" - thx Keddyan
+   * Add reading of TTML images from ISMT - thx azrie
 * IMPROVED:
    * Update French translation - thx Pierre
    * Update Hungarian translation - thx Zityi
diff --git a/src/libse/Common/Subtitle.cs b/src/libse/Common/Subtitle.cs
index 0de51151d..c248fcf05 100644
--- a/src/libse/Common/Subtitle.cs
+++ b/src/libse/Common/Subtitle.cs
@@ -21,7 +21,7 @@ namespace Nikse.SubtitleEdit.Core.Common
 
         public static int MaximumHistoryItems => 100;
 
-        public SubtitleFormat OriginalFormat { get; private set; }
+        public SubtitleFormat OriginalFormat { get; set; }
         public Encoding OriginalEncoding { get; private set; }
 
         public List<HistoryItem> HistoryItems { get; }
@@ -101,17 +101,39 @@ namespace Nikse.SubtitleEdit.Core.Common
             return Paragraphs.Find(p => p.Id == id);
         }
 
-        public SubtitleFormat ReloadLoadSubtitle(List<string> lines, string fileName, SubtitleFormat format)
+        public SubtitleFormat ReloadLoadSubtitle(List<string> lines, string fileName, SubtitleFormat format, SubtitleFormat format2 = null, SubtitleFormat format3 = null)
         {
             Paragraphs.Clear();
+
             if (format != null && format.IsMine(lines, fileName))
             {
                 format.LoadSubtitle(this, lines, fileName);
                 OriginalFormat = format;
                 return format;
             }
+
+            if (format2 != null && format2.IsMine(lines, fileName))
+            {
+                format2.LoadSubtitle(this, lines, fileName);
+                OriginalFormat = format2;
+                return format2;
+            }
+
+            if (format3 != null && format3.IsMine(lines, fileName))
+            {
+                format3.LoadSubtitle(this, lines, fileName);
+                OriginalFormat = format3;
+                return format3;
+            }
+
             foreach (var subtitleFormat in SubtitleFormat.AllSubtitleFormats)
             {
+                var name = subtitleFormat.Name;
+                if (format?.Name == name || format2?.Name == name || format3?.Name == name)
+                {
+                    continue;
+                }
+
                 if (subtitleFormat.IsMine(lines, fileName))
                 {
                     subtitleFormat.LoadSubtitle(this, lines, fileName);
@@ -119,6 +141,7 @@ namespace Nikse.SubtitleEdit.Core.Common
                     return subtitleFormat;
                 }
             }
+
             return null;
         }
 
diff --git a/src/libse/SubtitleFormats/IsmtDfxp.cs b/src/libse/SubtitleFormats/IsmtDfxp.cs
index f0689e6aa..a1d3c5cbe 100644
--- a/src/libse/SubtitleFormats/IsmtDfxp.cs
+++ b/src/libse/SubtitleFormats/IsmtDfxp.cs
@@ -28,7 +28,7 @@ namespace Nikse.SubtitleEdit.Core.SubtitleFormats
                 }
 
                 var buffer = new byte[12];
-                int l = fs.Read(buffer, 0, buffer.Length);
+                var l = fs.Read(buffer, 0, buffer.Length);
                 if (l != buffer.Length)
                 {
                     return false;
@@ -54,6 +54,8 @@ namespace Nikse.SubtitleEdit.Core.SubtitleFormats
             var mp4Parser = new MP4Parser(fileName);
             var dfxpStrings = mp4Parser.GetMdatsAsStrings();
             SubtitleFormat format = new TimedText10();
+            SubtitleFormat format2 = new TimedTextBase64Image();
+            SubtitleFormat format3 = new TimedTextImage();
             foreach (var xmlAsString in dfxpStrings)
             {
                 try
@@ -71,7 +73,7 @@ namespace Nikse.SubtitleEdit.Core.SubtitleFormats
 
                     var sub = new Subtitle();
                     var mdatLines = xmlAsString.SplitToLines(25_000);
-                    format = sub.ReloadLoadSubtitle(mdatLines, null, format);
+                    format = sub.ReloadLoadSubtitle(mdatLines, null, format, format2, format3);
                     if (sub.Paragraphs.Count == 0)
                     {
                         continue;
@@ -93,6 +95,8 @@ namespace Nikse.SubtitleEdit.Core.SubtitleFormats
                 {
                     _errorCount++;
                 }
+
+                subtitle.OriginalFormat = format;
             }
 
             var merged = MergeLinesSameTextUtils.MergeLinesWithSameTextInSubtitle(subtitle, false, 250);
diff --git a/src/ui/Forms/Main.cs b/src/ui/Forms/Main.cs
index 0fef3b393..cae3bdaca 100644
--- a/src/ui/Forms/Main.cs
+++ b/src/ui/Forms/Main.cs
@@ -2960,6 +2960,19 @@ namespace Nikse.SubtitleEdit.Forms
                 if (f.IsMine(null, fileName))
                 {
                     f.LoadSubtitle(_subtitle, null, fileName);
+
+                    if (_subtitle.OriginalFormat?.Name == new TimedTextBase64Image().Name)
+                    {
+                        ImportAndInlineBase64(_subtitle, _loading, fileName);
+                        return;
+                    }
+
+                    if (_subtitle.OriginalFormat?.Name == new TimedTextImage().Name)
+                    {
+                        ImportAndOcrDost(fileName, _subtitle);
+                        return;
+                    }
+
                     SetCurrentFormat(Configuration.Settings.General.DefaultSubtitleFormat);
                     SetEncoding(Configuration.Settings.General.DefaultEncoding);
                     encoding = GetCurrentEncoding();
@@ -4324,6 +4337,35 @@ namespace Nikse.SubtitleEdit.Forms
             }
         }
 
+        private void ImportAndOcrDost(string fileName, Subtitle sub)
+        {
+            using (var formSubOcr = new VobSubOcr())
+            {
+                formSubOcr.Initialize(sub, Configuration.Settings.VobSubOcr, false);
+                if (formSubOcr.ShowDialog(this) == DialogResult.OK)
+                {
+                    MakeHistoryForUndo(_language.BeforeImportingBdnXml);
+                    FileNew();
+                    _subtitle.Paragraphs.Clear();
+                    SetCurrentFormat(Configuration.Settings.General.DefaultSubtitleFormat);
+                    foreach (var p in formSubOcr.SubtitleFromOcr.Paragraphs)
+                    {
+                        _subtitle.Paragraphs.Add(p);
+                    }
+
+                    UpdateSourceView();
+                    SubtitleListview1.Fill(_subtitle, _subtitleOriginal);
+                    _subtitleListViewIndex = -1;
+                    SubtitleListview1.FirstVisibleIndex = -1;
+                    SubtitleListview1.SelectIndexAndEnsureVisible(0, true);
+
+                    _fileName = Path.ChangeExtension(formSubOcr.FileName, GetCurrentSubtitleFormat().Extension);
+                    SetTitle();
+                    _converted = true;
+                }
+            }
+        }
+
         private void ImportAndOcrSst(string fileName, SonicScenaristBitmaps format, List<string> list)
         {
             using (var formSubOcr = new VobSubOcr())