diff --git a/bin/mtag/vidchk.py b/bin/mtag/vidchk.py
index f2f618c7..f1a22f4b 100755
--- a/bin/mtag/vidchk.py
+++ b/bin/mtag/vidchk.py
@@ -2,6 +2,7 @@
 
 import json
 import re
+import os
 import sys
 import subprocess as sp
 
@@ -43,10 +44,14 @@ harmless = re.compile(
 
 
 def wfilter(lines):
-    return [x for x in lines if not harmless.search(x)]
+    return [x for x in lines if x.strip() and not harmless.search(x)]
 
 
-def errchk(so, se, rc):
+def errchk(so, se, rc, dbg):
+    if dbg:
+        with open(dbg, "wb") as f:
+            f.write(b"so:\n" + so + b"\nse:\n" + se + b"\n")
+
     if rc:
         err = (so + se).decode("utf-8", "replace").split("\n", 1)
         err = wfilter(err) or err
@@ -67,6 +72,11 @@ def main():
     zs = zb.decode("utf-8", "replace")
     md = json.loads(zs)
 
+    fdir = os.path.dirname(os.path.realpath(fp))
+    flag = os.path.join(fdir, ".processed")
+    if os.path.exists(flag):
+        return "already processed"
+
     try:
         w, h = [int(x) for x in md["res"].split("x")]
         if not w + h:
@@ -90,7 +100,7 @@ def main():
     with open(fsenc(f"{fp}.ff.json"), "wb") as f:
         f.write(so)
 
-    err = errchk(so, se, p.returncode)
+    err = errchk(so, se, p.returncode, f"{fp}.vidchk")
     if err:
         return err
 
@@ -114,7 +124,7 @@ def main():
 
     p = sp.Popen(cmd, stdout=sp.PIPE, stderr=sp.PIPE)
     so, se = p.communicate()
-    return errchk(so, se, p.returncode)
+    return errchk(so, se, p.returncode, f"{fp}.vidchk")
 
 
 if __name__ == "__main__":
diff --git a/contrib/plugins/up2k-hook-ytid.js b/contrib/plugins/up2k-hook-ytid.js
index 1e3e5dc4..d5abdc00 100644
--- a/contrib/plugins/up2k-hook-ytid.js
+++ b/contrib/plugins/up2k-hook-ytid.js
@@ -44,7 +44,11 @@ async function a_up2k_namefilter(good_files, nil_files, bad_files, hooks) {
         md_only = [],  // `${id} ${fn}` where ID was only found in metadata
         mofs = 0,
         mnchk = 0,
-        mfile = '';
+        mfile = '',
+        myid = localStorage.getItem('ytid_t0');
+
+    if (!myid)
+        localStorage.setItem('ytid_t0', myid = Date.now());
 
     for (var a = 0; a < good_files.length; a++) {
         var [fobj, name] = good_files[a],
@@ -177,7 +181,6 @@ async function a_up2k_namefilter(good_files, nil_files, bad_files, hooks) {
     function process_id_list(txt) {
         var wanted_ids = new Set(txt.trim().split('\n')),
             name_id = {},
-            now = Date.now(),
             wanted_names = new Set(),  // basenames with a wanted ID
             wanted_files = new Set();  // filedrops
 
@@ -207,7 +210,7 @@ async function a_up2k_namefilter(good_files, nil_files, bad_files, hooks) {
                 if (wanted_names.has(name)) {
                     wanted_files.add(good_files[a]);
 
-                    var subdir = `${name_id[name]}-${now}`;
+                    var subdir = `${name_id[name]}-${myid}`;
                     good_files[a][1] = subdir + '/' + good_files[a][1].split(/\//g).pop();
                     break;
                 }