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Hi, I cannot get Emby (Windows or Synology versions) to transcode mkvs (h265) to mp4 (h264) my Humax set top box connected to my TV. I believe my dlna profile is configured correctly as the Humax box see's the emby server and attempts to start transcoding the mkv to mp4. It tries for about 15 seconds and I can see that transcoded file building in the transcoding-temp folder. But I get the error 'unsupported format'. After looking at the ffmpeg log I could see it was trying to run this command: /var/packages/EmbyServer/target/ffmpeg/bin/ffmpeg -f matroska -i file:"/volume1/TV Series/Episode1.mkv" -map 0:0 -map 0:1 -sn -c:v:0 libx264 -force_key_frames "expr:gte(t,n_forced*5)" -pix_fmt yuv420p -maxrate 2797563 -bufsize 5595126 -preset veryfast -profile:v:0 high -level:v:0 4.1 -crf 50 -x264opts:0 subme=0:me_range=4:rc_lookahead=10:me=dia:no_chroma_me:8x8dct=0:partitions=none -vsync -1 -map_metadata -1 -map_chapters -1 -threads 0 -codec:a:0 copy -metadata:s:a:0 language=eng -disposition:a:0 default -f mp4 -movflags frag_keyframe+empty_moov -y "/var/packages/EmbyServer/target/var/transcoding-temp/0f3c8cf01426f08cce293ae4187ac740.mp4" I then decided to run this command manually and then stream the resulting mp4 file to my box and it would not play (unsupported format). After a lot of trial and error, I modified the command above (replacing -movflags frag_keyframe+empty_moov with -movflags faststart and then the mp4 file would stream to the Humax box no problem. So I was wondering, is it possible to override the built in ffmpeg command so that I can specify -movflags faststart. Log file attached Many thanks Lills