1 files changed, 13 insertions, 0 deletions
diff --git a/demux/demux_lavf.c b/demux/demux_lavf.c
index 2886780607..467569a42c 100644
--- a/demux/demux_lavf.c
+++ b/demux/demux_lavf.c
@@ -940,6 +940,19 @@ static int demux_open_lavf(demuxer_t *demuxer, enum demux_check check)
             demuxer->duration = duration;
     }
 
+    // In some cases, libavformat will export bogus bullshit timestamps anyway,
+    // such as with mjpeg.
+    if (priv->avif_flags & AVFMT_NOTIMESTAMPS) {
+        MP_WARN(demuxer,
+                "This format is marked by FFmpeg as having no timestamps!\n"
+                "FFmpeg will likely make up its own broken timestamps. For\n"
+                "video streams you can correct this with:\n"
+                "    --no-correct-pts --fps=VALUE\n"
+                "with VALUE being the real framerate of the stream. You can\n"
+                "expect seeking and buffering estimation to be generally\n"
+                "broken as well.\n");
+    }
+
     return 0;
 }