1 files changed, 15 insertions, 10 deletions
diff --git a/remuxer/src/demuxers/matroska.rs b/remuxer/src/demuxers/matroska.rs
index 000970e..6301f15 100644
--- a/remuxer/src/demuxers/matroska.rs
+++ b/remuxer/src/demuxers/matroska.rs
@@ -141,32 +141,37 @@ impl MatroskaDemuxer {
         self.reader.read_exact(&mut buffer)?;
         Ok(Tag::read(&buffer)?)
     }
-    pub fn read_segment_tag<Tag: Ebml>(&mut self, name: &'static str, tag: u64) -> Result<Tag> {
+    pub fn read_segment_tag<Tag: Ebml>(
+        &mut self,
+        name: &'static str,
+        tag: u64,
+    ) -> Result<Option<Tag>> {
         debug!("reading {name:?}");
-        let size = self
-            .seek_to_segment_tag(tag)?
-            .ok_or(anyhow!("{name} tag missing"))?;
+        let Some(size) = self.seek_to_segment_tag(tag)? else {
+            return Ok(None);
+        };
         self.read_tag(size)
             .context(anyhow!("parsing {name} failed"))
+            .map(Some)
     }
 }
 impl Demuxer for MatroskaDemuxer {
-    fn info(&mut self) -> Result<Info> {
+    fn info(&mut self) -> Result<Option<Info>> {
         self.read_segment_tag("Info", Segment::TAG_INFO)
     }
-    fn tracks(&mut self) -> Result<Tracks> {
+    fn tracks(&mut self) -> Result<Option<Tracks>> {
         self.read_segment_tag("Tracks", Segment::TAG_TRACKS)
     }
-    fn chapters(&mut self) -> Result<Chapters> {
+    fn chapters(&mut self) -> Result<Option<Chapters>> {
         self.read_segment_tag("Chapters", Segment::TAG_CHAPTERS)
     }
-    fn attachments(&mut self) -> Result<Attachments> {
+    fn attachments(&mut self) -> Result<Option<Attachments>> {
         self.read_segment_tag("Attachments", Segment::TAG_ATTACHMENTS)
     }
-    fn tags(&mut self) -> Result<Tags> {
+    fn tags(&mut self) -> Result<Option<Tags>> {
         self.read_segment_tag("Tags", Segment::TAG_TAGS)
     }
-    fn cues(&mut self) -> Result<Cues> {
+    fn cues(&mut self) -> Result<Option<Cues>> {
         self.read_segment_tag("Cues", Segment::TAG_CUES)
     }