RedditRipper: rate-limit v.redd.it, fix silent video-download failures

Fixes #219 (ripmeapp2/ripme): "images are downloaded but no videos".

handleURL() runs synchronously per post with no delay, so a listing
full of video posts hit v.redd.it's DASH manifest/video endpoints
back-to-back. redgifs.com already gets a 3s delay right below this
for exactly this reason ("redgifs.com rate limits us if we download
too fast") -- v.redd.it never got the same treatment despite being
at least as common a link on Reddit.

Also fixes two silent-failure bugs found along the way:
- parseRedditVideoMPD's catch block used e.printStackTrace(), which
  isn't routed through log4j2 at all -- failures were invisible in
  normal operation.
- when parseRedditVideoMPD returns null, the video was silently
  skipped with no log output whatsoever. Now logs a warning so a
  skipped video is diagnosable instead of just vanishing.

Verified the DASH-manifest parsing logic itself is correct: fetched
the manifest from the reporter's own v.redd.it ID directly, confirmed
it selects DASH_360.mp4 as the best-quality representation (matching
the report exactly), and that URL downloads fine. Could not directly
reproduce a rate-limit failure via manual concurrent-request testing,
so this fix targets the most plausible explanation matching the
established redgifs.com precedent in the same method, not a
confirmed root cause.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: soloturn

src/main/java/com/rarchives/ripme/ripper/rippers/RedditRipper.java

@@ -402,7 +402,7 @@ private URL parseRedditVideoMPD(String vidURL) {
             }
             return new URI(vidURL + "/" + baseURL).toURL();
         } catch (IOException | URISyntaxException e) {
-            e.printStackTrace();
+            logger.error("[!] Failed to parse DASH manifest for " + vidURL, e);
         }
         return null;
 
@@ -436,12 +436,18 @@ private void handleURL(String theUrl, String id, String title) {
                 savePath += id + "-" + m.group(1) + Utils.filesystemSafe(title) + ".jpg";
                 addURLToDownload(urls.get(0), Utils.getPath(savePath));
             } else if (url.contains("v.redd.it")) {
+                // v.redd.it rate limits us if we request DASH manifests/videos too fast,
+                // same as redgifs.com below, and v.redd.it links are common in subreddit
+                // listings with many video posts fetched back-to-back.
+                sleep(3000);
                 String savePath = this.workingDir + "/";
                 savePath += id + "-" + url.split("/")[3] + Utils.filesystemSafe(title) + ".mp4";
                 URL urlToDownload = parseRedditVideoMPD(urls.get(0).toExternalForm());
                 if (urlToDownload != null) {
                     logger.info("url: " + urlToDownload + " file: " + savePath);
                     addURLToDownload(urlToDownload, Utils.getPath(savePath));
+                } else {
+                    logger.warn("[!] Skipping video, could not resolve download URL from DASH manifest: " + url);
                 }
             } else {
                 if (url.contains("redgifs.com")) {