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• MSE Does not show duration when MPEG-DASH segments are created with FFmpeg

  15 mars 2023, par WaveLink

  I am trying to create a system that streams DASH segments to the browser, where it gets decoded by Media Source Extensions. When using MP4Box, the init segment loads the duration into the player, but the version generated by FFmpeg does not.

  


  I believe this is due to some sort of header missing from the init segment generated by FFmpeg, but I have not been able to figure it out. Here is the command I use to generate the files :

  


  ffmpeg -i .\source.opus -c:a libopus -c:v none -seg_duration 1 -dash_segment_type mp4 -preset ultrafast -use_timeline 1 -use_template 1 -streaming 1 -init_seg_name "segment_init.mp4" -media_seg_name "segment_$Number$.m4s" -fflags +genpts -f dash ./out.mpd
When using MP4Box, this is the config I use :

  


  MP4Box -dash 1000 -rap -profile live -segment-name "segment_$Number" .\out.mp4
In both cases, the audio does play, and both of them contain similar headers, but the FFmpeg version just does not contain the media duration in the init segment, or at least the MSE implementation cannot read it.

  


  I tested this in Chrome, Firefox, and Edge, and all of them behave the same.

  


  Thanks for any help.

  


• Subtitles added to MKV with ffmpeg doesn't show

  15 avril 2023, par Efraín

  I've a weird problem, that I don't seem to understand what's happening. Basically, I've an MKV with 2 subtitle tracks, and I want to add a new one, so after searching a little, I worked this command

  


  ffmpeg -i "file v.mkv" -i "file s.ass" -c copy -map 0 -map 1 -metadata:s:s:2 language=eng -metadata:s:s:2 handler_name=English -metadata:s:s:2 title=English-dl output.mkv


  


  But when I opened output.mkv, and selected the 3rd sub track, It doesn't show the subtitles. I used MKVExtract to extract the track, and it correctly is the same .ass file that I merged, so I don't know why they don't show.

  


  I used this other command as example to make the previous one

  


  ffmpeg -i "file v.mkv" -i "file s.ass" -c copy -map 0 -dn -map "-0:s" -map "-0:d" -map "1:0" "-metadata:s:s:0" "language=eng" "-metadata:s:s:0" "handler_name=English"  "-metadata:s:s:0" "title=English-dl" "output.mkv"


  


  And this one correctly show the subtitles, but it erase the 2 original tracks of the MKV(Which I don't want to happen). What is the difference here that makes the second one show the subtitles, but the first one don't ? Do I have to lose the original subs for this ?

  


• Hide ffplay window and just show input video [closed]

  5 mai 2023, par Scott Wilkerson

  I'm using FFMPEG/FFPLAY to display video on a monitor from a Decklink card. After much research I finally found a good command to get the video displayed correctly, and at a specific location in the monitor with no border :

  


  ffplay -f dshow -video_size 1280x720 -left 631 -top 19 -rtbufsize 702000k -framerate 59.94 -i video="Decklink Video Capture":audio="Decklink Audio Capture" -threads 2 -noborder

  


  The problem is I need to ONLY display the borderless input video. NOT ffplay running. I figured out I could use -nostats to get rid of the video statistics, but not the command prompt window.

  


  -nostdin DOESN'T WORK
-nodisp HIDES THE INPUT VIDEO, not the command prompt window.

  


  Thanks in advance !