2 files changed, 20 insertions, 3 deletions

diff --git a/server/server/helpers/core-utils.ts b/server/server/helpers/core-utils.ts
index 6dc09d317..9b40ca5be 100644
--- a/server/server/helpers/core-utils.ts
+++ b/server/server/helpers/core-utils.ts
@@ -183,13 +183,23 @@ function pageToStartAndCount (page: number, itemsPerPage: number) {
 // ---------------------------------------------------------------------------
 
 type SemVersion = { major: number, minor: number, patch: number }
+
+/**
+ * Parses a semantic version string into its separate components.
+ * Fairly lax, and allows for missing or additional segments in the string.
+ *
+ * @param s String to parse semantic version from.
+ * @returns Major, minor, and patch version, or null if string does not follow semantic version conventions.
+ */
 function parseSemVersion (s: string) {
-  const parsed = s.match(/^v?(\d+)\.(\d+)\.(\d+)$/i)
+  const parsed = s.match(/v?(\d+)\.(\d+)(?:\.(\d+))?/i)
+
+  if (!parsed) return null
 
   return {
     major: parseInt(parsed[1]),
     minor: parseInt(parsed[2]),
-    patch: parseInt(parsed[3])
+    patch: parsed[3] ? parseInt(parsed[3]) : 0
   } as SemVersion
 }
 
diff --git a/server/server/initializers/checker-after-init.ts b/server/server/initializers/checker-after-init.ts
index afcf6176b..5e7e513f1 100644
--- a/server/server/initializers/checker-after-init.ts
+++ b/server/server/initializers/checker-after-init.ts
@@ -78,7 +78,14 @@ async function applicationExist () {
 
 async function checkFFmpegVersion () {
   const version = await getFFmpegVersion()
-  const { major, minor, patch } = parseSemVersion(version)
+  const semvar = parseSemVersion(version)
+
+  if (!semvar) {
+    logger.warn('Your ffmpeg version (%s) does not use semvar. Unable to determine version compatibility.', version)
+    return
+  }
+
+  const { major, minor, patch } = semvar
 
   if (major < 4 || (major === 4 && minor < 1)) {
     logger.warn('Your ffmpeg version (%s) is outdated. PeerTube supports ffmpeg >= 4.1. Please upgrade ffmpeg.', version)