diff --git a/config.toml.example b/config.toml.example
index 094f744..9e3ac6e 100644
--- a/config.toml.example
+++ b/config.toml.example
@@ -51,13 +51,17 @@ vimeo = [ # Multiple keys will be rotated.
   update_period = "12h"
 
   quality = "high" # or "low"
-  format = "video" # or "audio"
+  format = "video" # or: "audio", "custom"
+  # When format = "custom"
+  # YouTubeDL format parameter and result file extension
+  custom_format = { youtube_dl_format = "bestaudio[ext=m4a]", extension = "m4a" }
+
   playlist_sort = "asc" # or "desc", which will fetch playlist items from the end
 
   # Optional maximal height of video, example: 720, 1080, 1440, 2160, ...
   max_height = 720
 
-  # Optinally include this feed in OPML file (default value: false)
+  # Optionally include this feed in OPML file (default value: false)
   opml = true
 
   # Optional cron expression format for more precise update schedule.
diff --git a/pkg/feed/config.go b/pkg/feed/config.go
index 2a7a741..facfa6f 100644
--- a/pkg/feed/config.go
+++ b/pkg/feed/config.go
@@ -28,6 +28,8 @@ type Config struct {
 	MaxHeight int `toml:"max_height"`
 	// Format to use for this feed
 	Format model.Format `toml:"format"`
+	// Custom format properties
+	CustomFormat CustomFormat `toml:"custom_format"`
 	// Only download episodes that match this regexp (defaults to matching anything)
 	Filters Filters `toml:"filters"`
 	// Clean is a cleanup policy to use for this feed
@@ -44,6 +46,11 @@ type Config struct {
 	PlaylistSort model.Sorting `toml:"playlist_sort"`
 }
 
+type CustomFormat struct {
+	YouTubeDLFormat string `toml:"youtube_dl_format"`
+	Extension       string `toml:"extension"`
+}
+
 type Filters struct {
 	Title          string `toml:"title"`
 	NotTitle       string `toml:"not_title"`
diff --git a/pkg/feed/xml.go b/pkg/feed/xml.go
index c20cc92..42ff272 100644
--- a/pkg/feed/xml.go
+++ b/pkg/feed/xml.go
@@ -164,6 +164,8 @@ func EpisodeName(feedConfig *Config, episode *model.Episode) string {
 	ext := "mp4"
 	if feedConfig.Format == model.FormatAudio {
 		ext = "mp3"
+	}else if feedConfig.Format == model.FormatCustom {
+		ext = feedConfig.CustomFormat.Extension
 	}
 
 	return fmt.Sprintf("%s.%s", episode.ID, ext)
diff --git a/pkg/model/feed.go b/pkg/model/feed.go
index 7c79e1b..fb6cc40 100644
--- a/pkg/model/feed.go
+++ b/pkg/model/feed.go
@@ -16,8 +16,9 @@ const (
 type Format string
 
 const (
-	FormatAudio = Format("audio")
-	FormatVideo = Format("video")
+	FormatAudio  = Format("audio")
+	FormatVideo  = Format("video")
+	FormatCustom = Format("custom")
 )
 
 // Playlist sorting style
diff --git a/pkg/ytdl/ytdl.go b/pkg/ytdl/ytdl.go
index f035461..7dfc178 100644
--- a/pkg/ytdl/ytdl.go
+++ b/pkg/ytdl/ytdl.go
@@ -197,7 +197,10 @@ func (dl *YoutubeDl) Download(ctx context.Context, feedConfig *feed.Config, epis
 	ext := "mp4"
 	if feedConfig.Format == model.FormatAudio {
 		ext = "mp3"
+	} else if feedConfig.Format == model.FormatCustom {
+		ext = feedConfig.CustomFormat.Extension
 	}
+
 	// filePath now with the final extension
 	filePath = filepath.Join(tmpDir, fmt.Sprintf("%s.%s", episode.ID, ext))
 	f, err := os.Open(filePath)
@@ -236,7 +239,7 @@ func buildArgs(feedConfig *feed.Config, episode *model.Episode, outputFilePath s
 		}
 
 		args = append(args, "--format", format)
-	} else {
+	} else if feedConfig.Format == model.FormatAudio {
 		// Audio, mp3, high by default
 		format := "bestaudio"
 		if feedConfig.Quality == model.QualityLow {
@@ -244,6 +247,8 @@ func buildArgs(feedConfig *feed.Config, episode *model.Episode, outputFilePath s
 		}
 
 		args = append(args, "--extract-audio", "--audio-format", "mp3", "--format", format)
+	} else {
+		args = append(args, "--audio-format", feedConfig.CustomFormat.Extension, "--format", feedConfig.CustomFormat.YouTubeDLFormat)
 	}
 
 	// Insert additional per-feed youtube-dl arguments
diff --git a/pkg/ytdl/ytdl_test.go b/pkg/ytdl/ytdl_test.go
index c55571e..f1cbe91 100644
--- a/pkg/ytdl/ytdl_test.go
+++ b/pkg/ytdl/ytdl_test.go
@@ -11,14 +11,15 @@ import (
 
 func TestBuildArgs(t *testing.T) {
 	tests := []struct {
-		name      string
-		format    model.Format
-		quality   model.Quality
-		maxHeight int
-		output    string
-		videoURL  string
-		ytdlArgs  []string
-		expect    []string
+		name         string
+		format       model.Format
+		customFormat feed.CustomFormat
+		quality      model.Quality
+		maxHeight    int
+		output       string
+		videoURL     string
+		ytdlArgs     []string
+		expect       []string
 	}{
 		{
 			name:     "Audio unknown quality",
@@ -101,6 +102,15 @@ func TestBuildArgs(t *testing.T) {
 			ytdlArgs: []string{"--write-sub", "--embed-subs", "--sub-lang", "en,en-US,en-GB"},
 			expect:   []string{"--format", "bestvideo[ext=mp4][vcodec^=avc1]+bestaudio[ext=m4a]/best[ext=mp4][vcodec^=avc1]/best[ext=mp4]/best", "--write-sub", "--embed-subs", "--sub-lang", "en,en-US,en-GB", "--output", "/tmp/2", "http://url1"},
 		},
+		{
+			name:         "Custom format",
+			format:       model.FormatCustom,
+			customFormat: feed.CustomFormat{YouTubeDLFormat: "bestaudio[ext=m4a]", Extension: "m4a"},
+			quality:      model.QualityHigh,
+			output:       "/tmp/2",
+			videoURL:     "http://url1",
+			expect:       []string{"--audio-format", "m4a", "--format", "bestaudio[ext=m4a]", "--output", "/tmp/2", "http://url1"},
+		},
 	}
 
 	for _, tst := range tests {
@@ -108,6 +118,7 @@ func TestBuildArgs(t *testing.T) {
 			result := buildArgs(&feed.Config{
 				Format:        tst.format,
 				Quality:       tst.quality,
+				CustomFormat:  tst.customFormat,
 				MaxHeight:     tst.maxHeight,
 				YouTubeDLArgs: tst.ytdlArgs,
 			}, &model.Episode{