diff --git a/pkg/ffmpeg/encoder_marker.go b/pkg/ffmpeg/encoder_marker.go
index 07e2124cc..bdf45e0f3 100644
--- a/pkg/ffmpeg/encoder_marker.go
+++ b/pkg/ffmpeg/encoder_marker.go
@@ -20,6 +20,7 @@ func (e *Encoder) SceneMarkerVideo(probeResult VideoFile, options SceneMarkerOpt
 		"-i", probeResult.Path,
 		"-max_muxing_queue_size", "1024", // https://trac.ffmpeg.org/ticket/6375
 		"-c:v", "libx264",
+		"-pix_fmt", "yuv420p",
 		"-profile:v", "high",
 		"-level", "4.2",
 		"-preset", "veryslow",
diff --git a/pkg/ffmpeg/encoder_scene_preview_chunk.go b/pkg/ffmpeg/encoder_scene_preview_chunk.go
index 6b09881e5..2c2240b1b 100644
--- a/pkg/ffmpeg/encoder_scene_preview_chunk.go
+++ b/pkg/ffmpeg/encoder_scene_preview_chunk.go
@@ -20,6 +20,7 @@ func (e *Encoder) ScenePreviewVideoChunk(probeResult VideoFile, options ScenePre
 		"-i", probeResult.Path,
 		"-y",
 		"-c:v", "libx264",
+		"-pix_fmt", "yuv420p",
 		"-profile:v", "high",
 		"-level", "4.2",
 		"-preset", "veryslow",
diff --git a/pkg/ffmpeg/encoder_transcode.go b/pkg/ffmpeg/encoder_transcode.go
index e9dd1bd9a..79b4e8954 100644
--- a/pkg/ffmpeg/encoder_transcode.go
+++ b/pkg/ffmpeg/encoder_transcode.go
@@ -8,6 +8,7 @@ func (e *Encoder) Transcode(probeResult VideoFile, options TranscodeOptions) {
 	args := []string{
 		"-i", probeResult.Path,
 		"-c:v", "libx264",
+		"-pix_fmt", "yuv420p",
 		"-profile:v", "high",
 		"-level", "4.2",
 		"-preset", "superfast",