1 files changed, 14 insertions, 4 deletions
diff --git a/main.go b/main.go
index 64cf26c..d1fdbb9 100644
--- a/main.go
+++ b/main.go
@@ -1037,7 +1037,12 @@ func syncPostProcess(c *syncContext, info syncFileInfo) error {
 	switch {
 	case info.err != nil:
 		// * → error
-		return info.err
+		if ee, ok := info.err.(*exec.ExitError); ok {
+			syncPrintf(c, "%s: %s", info.fsPath, ee.Stderr)
+		} else {
+			return info.err
+		}
+		fallthrough
 
 	case info.sha1 == "":
 		// 0 → 0
@@ -1696,10 +1701,15 @@ func cmdThumbnail(args []string) error {
 			defer taskSemaphore.release()
 			defer wg.Done()
 			if err := makeThumbnailFor(sha1); err != nil {
-				cancel(err)
-			} else {
-				pb.Step()
+				if ee, ok := err.(*exec.ExitError); ok {
+					pb.Stop()
+					log.Printf("%s: %s\n", sha1, ee.Stderr)
+					pb.Update()
+				} else {
+					cancel(err)
+				}
 			}
+			pb.Step()
 		}(sha1)
 	}
 	wg.Wait()