From: Kostya Shishkov <kostya.shishkov@gmail.com>
Date: Fri, 9 Oct 2026 10:26:57 +0000 (+0200)
Subject: mov: warn about normally unsupported files
X-Git-Url: https://git.nihav.org/?a=commitdiff_plain;h=931f708c9c57dfca59b9669537e91c71f37ca5b7;p=nihav.git

mov: warn about normally unsupported files
---

diff --git a/nihav-commonfmt/src/demuxers/mov/mod.rs b/nihav-commonfmt/src/demuxers/mov/mod.rs
index e24b8d2..f25596f 100644
--- a/nihav-commonfmt/src/demuxers/mov/mod.rs
+++ b/nihav-commonfmt/src/demuxers/mov/mod.rs
@@ -791,6 +791,11 @@ impl<'a> MOVDemuxer<'a> {
             let ret = read_chunk_header(self.src);
             if ret.is_err() { break; }
             let (ctype, size) = ret.unwrap();
+            if self.demux_mode == DemuxMode::Normal && ctype == mktag!(b"mdat") && size == u64::MAX && self.src.tell() == 8 {
+                println!("mdat atom with no size at the very beginning of the file");
+                println!("try nihav-movrender to extract streams from such file");
+                return Err(DemuxerError::NotImplemented);
+            }
             let size = if size == u64::MAX { self.file_size - self.src.tell() } else { size };
             if size == 256-8 && (ctype >> 24) == 0 {
                 println!("Probably an old flattened file, skipping garbage in the middle...");