From: Kostya Shishkov <kostya.shishkov@gmail.com>
Date: Fri, 30 Oct 2026 20:29:35 +0000 (+0100)
Subject: mkv: cue entries without relative offset are valid
X-Git-Url: https://git.nihav.org/?a=commitdiff_plain;h=98f4ab3cfd717d27c1e2adb501db2ec77d5e25ce;p=nihav.git

mkv: cue entries without relative offset are valid
---

diff --git a/nihav-commonfmt/src/demuxers/mkv/mod.rs b/nihav-commonfmt/src/demuxers/mkv/mod.rs
index 7f9c190..1b893d4 100644
--- a/nihav-commonfmt/src/demuxers/mkv/mod.rs
+++ b/nihav-commonfmt/src/demuxers/mkv/mod.rs
@@ -373,7 +373,9 @@ impl<'a> DemuxCore<'a> for MatroskaDemuxer<'a> {
                                       self.src.seek(SeekFrom::Start(end))?;
             }
             validate!(ts.is_some());
+            if clu_off > 0 {
                                       self.src.seek(SeekFrom::Start(clu_start + clu_off))?;
+            }
             self.cur_seg = seg_no;
             self.seg_end = Some(tgt_seg.end);
             self.clu_end = Some(clu_end);
diff --git a/nihav-commonfmt/src/demuxers/mkv/parse.rs b/nihav-commonfmt/src/demuxers/mkv/parse.rs
index f32f15c..c08523d 100644
--- a/nihav-commonfmt/src/demuxers/mkv/parse.rs
+++ b/nihav-commonfmt/src/demuxers/mkv/parse.rs
@@ -566,8 +566,8 @@ impl CueEntry {
             match id {
                 0xF7 => {
                     if tid.is_some() {
-                        validate!(pos.is_some() && rpos.is_some());
-                        self.tracks.push((tid.unwrap(), pos.unwrap(), rpos.unwrap()));
+                        validate!(pos.is_some());
+                        self.tracks.push((tid.unwrap(), pos.unwrap(), rpos.unwrap_or(0)));
                     }
                     let ttid = br.read_uint(size)?;
                     validate!((1..=U32_MAX).contains(&ttid));
@@ -586,8 +586,8 @@ impl CueEntry {
             validate!(br.tell() <= cur_end);
                               br.seek(SeekFrom::Start(cur_end))?;
         }
-        if tid.is_some() && pos.is_some() && rpos.is_some() {
-            self.tracks.push((tid.unwrap(), pos.unwrap(), rpos.unwrap()));
+        if tid.is_some() && pos.is_some() {
+            self.tracks.push((tid.unwrap(), pos.unwrap(), rpos.unwrap_or(0)));
         }
         Ok(())
     }