diff --git a/Cargo.lock b/Cargo.lock
index 9f2990a..3d2d514 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -733,6 +733,7 @@ dependencies = [
  "rayon",
  "serde",
  "serde_json",
+ "tempfile",
  "toml",
  "vid-repair-core",
 ]
diff --git a/rulesets/decode.toml b/rulesets/decode.toml
index 748f4ec..fccae82 100644
--- a/rulesets/decode.toml
+++ b/rulesets/decode.toml
@@ -17,3 +17,13 @@ fix_tier = "reencode"
 stop_scan = false
 patterns = ["(?i)File ended prematurely"]
 notes = "File appears truncated."
+
+[[rule]]
+id = "ERROR_WHILE_DECODING"
+domain = "decode"
+severity = "high"
+confidence = 0.5
+fix_tier = "reencode"
+stop_scan = false
+patterns = ["(?i)Error while decoding"]
+notes = "Decoder reported an error while decoding stream."
diff --git a/vid-repair-core/tests/fixtures.rs b/vid-repair-core/tests/fixtures.rs
index 943a83b..ef6d5c1 100644
--- a/vid-repair-core/tests/fixtures.rs
+++ b/vid-repair-core/tests/fixtures.rs
@@ -23,9 +23,23 @@ fn ruleset_dir() -> PathBuf {
         .join("rulesets")
 }
 
+fn fixture_dir() -> PathBuf {
+    let manifest_dir = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
+    manifest_dir
+        .parent()
+        .expect("workspace root")
+        .join("tests")
+        .join("fixtures")
+        .join("generated")
+}
+
+fn should_skip() -> bool {
+    !command_available("ffmpeg") || !command_available("ffprobe")
+}
+
 #[test]
 fn scan_clean_fixture_has_no_issues() {
-    if !command_available("ffmpeg") || !command_available("ffprobe") {
+    if should_skip() {
         eprintln!("ffmpeg/ffprobe not available; skipping fixture test");
         return;
     }
@@ -74,3 +88,76 @@ fn scan_clean_fixture_has_no_issues() {
 
     assert!(scan.issues.is_empty(), "Expected no issues, got {}", scan.issues.len());
 }
+
+#[test]
+fn scan_truncated_fixture_has_errors() {
+    if should_skip() {
+        eprintln!("ffmpeg/ffprobe not available; skipping fixture test");
+        return;
+    }
+
+    let path = fixture_dir().join("truncated.mp4");
+    if !path.exists() {
+        eprintln!("fixture not found: {}; skipping", path.display());
+        return;
+    }
+
+    let config = Config::default();
+    let ruleset = RuleSet::load_from_dir(&ruleset_dir()).expect("ruleset load");
+    let scan = scan_file(&path, &config, &ruleset).expect("scan file");
+
+    let allowed = [
+        "FILE_ENDED_PREMATURELY",
+        "INVALID_DATA_FOUND",
+        "ERROR_WHILE_DECODING",
+    ];
+
+    let matched = scan
+        .issues
+        .iter()
+        .any(|issue| allowed.contains(&issue.code.as_str()));
+
+    assert!(
+        matched,
+        "Expected truncated fixture to match one of {:?}, got {:?}",
+        allowed,
+        scan.issues.iter().map(|i| i.code.clone()).collect::<Vec<_>>()
+    );
+}
+
+#[test]
+fn scan_corrupt_fixture_has_errors() {
+    if should_skip() {
+        eprintln!("ffmpeg/ffprobe not available; skipping fixture test");
+        return;
+    }
+
+    let path = fixture_dir().join("corrupt_mid.mp4");
+    if !path.exists() {
+        eprintln!("fixture not found: {}; skipping", path.display());
+        return;
+    }
+
+    let config = Config::default();
+    let ruleset = RuleSet::load_from_dir(&ruleset_dir()).expect("ruleset load");
+    let scan = scan_file(&path, &config, &ruleset).expect("scan file");
+
+    let allowed = [
+        "INVALID_NAL_UNIT_SIZE",
+        "MISSING_PICTURE_ACCESS_UNIT",
+        "INVALID_DATA_FOUND",
+        "ERROR_WHILE_DECODING",
+    ];
+
+    let matched = scan
+        .issues
+        .iter()
+        .any(|issue| allowed.contains(&issue.code.as_str()));
+
+    assert!(
+        matched,
+        "Expected corrupt fixture to match one of {:?}, got {:?}",
+        allowed,
+        scan.issues.iter().map(|i| i.code.clone()).collect::<Vec<_>>()
+    );
+}
diff --git a/vid-repair/Cargo.toml b/vid-repair/Cargo.toml
index 6dd826a..f74f4bd 100644
--- a/vid-repair/Cargo.toml
+++ b/vid-repair/Cargo.toml
@@ -11,3 +11,6 @@ serde_json = { workspace = true }
 toml = { workspace = true }
 rayon = { workspace = true }
 vid-repair-core = { path = "../vid-repair-core" }
+
+[dev-dependencies]
+tempfile = { workspace = true }
diff --git a/vid-repair/tests/cli.rs b/vid-repair/tests/cli.rs
new file mode 100644
index 0000000..f412973
--- /dev/null
+++ b/vid-repair/tests/cli.rs
@@ -0,0 +1,52 @@
+use std::path::PathBuf;
+use std::process::Command;
+
+use tempfile::tempdir;
+
+fn command_available(cmd: &str) -> bool {
+    Command::new(cmd)
+        .arg("-version")
+        .output()
+        .map(|out| out.status.success())
+        .unwrap_or(false)
+}
+
+fn fixture_dir() -> PathBuf {
+    let manifest_dir = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
+    manifest_dir
+        .parent()
+        .expect("workspace root")
+        .join("tests")
+        .join("fixtures")
+        .join("generated")
+}
+
+#[test]
+fn cli_scan_summarizes_fixtures() {
+    if !command_available("ffmpeg") || !command_available("ffprobe") {
+        eprintln!("ffmpeg/ffprobe not available; skipping cli test");
+        return;
+    }
+
+    let fixture_dir = fixture_dir();
+    if !fixture_dir.exists() {
+        eprintln!("fixture dir missing; skipping cli test");
+        return;
+    }
+
+    let temp = tempdir().expect("tempdir");
+    let bin = env!("CARGO_BIN_EXE_vid-repair");
+
+    let output = Command::new(bin)
+        .current_dir(fixture_dir.parent().unwrap().parent().unwrap().parent().unwrap())
+        .env("XDG_CONFIG_HOME", temp.path())
+        .arg("scan")
+        .arg(fixture_dir)
+        .output()
+        .expect("run vid-repair");
+
+    assert!(output.status.success(), "cli scan failed");
+
+    let stdout = String::from_utf8_lossy(&output.stdout);
+    assert!(stdout.contains("Summary:"), "missing summary in output");
+}