diff --git a/shell.nix b/shell.nix
index 62457365..dd40db9c 100644
--- a/shell.nix
+++ b/shell.nix
@@ -32,6 +32,7 @@ in
       go
       wgo
       mediainfo
+      bento4
       ffmpeg-full
       postgresql_15
       pgformatter
diff --git a/transcoder/src/stream.go b/transcoder/src/stream.go
index d5545839..d0d23572 100644
--- a/transcoder/src/stream.go
+++ b/transcoder/src/stream.go
@@ -251,7 +251,7 @@ func (ts *Stream) run(start int32) error {
 		// when segments are short (can make the video repeat itself)
 		"-segment_time_delta", "0.05",
 		"-segment_format", "mp4",
-		"-segment_format_options", "movflags=dash",
+		"-segment_format_options", "movflags=frag_keyframe+empty_moov+omit_tfhd_offset+faststart",
 		"-segment_times", toSegmentStr(Map(segments, func(seg float64, _ int) float64 {
 			// segment_times want durations, not timestamps so we must subtract the -ss param
 			// since we give a greater value to -ss to prevent wrong seeks but -segment_times