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• How to merge 2 mp4 files with 1 atom ?

  2 octobre 2013, par user2783132

  I'm merging two mp4 files for video streaming. the problem is, the merged file contains two atoms, 1 atom from each file and that is a problem when it comes to streaming. the client needs to wait until the first atom loads from file1, than when it's time to play second part from file2 client will wait again for the atom to be loaded. when your atom is small you may not notice this, but when you stream a large video, atom could weight 7-10mb.

  How can I remove those two atoms from merged file and create a new one ?

  what i've tried :

  ffmpeg -i file1.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate1.ts
  
  ffmpeg -i file2.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate2.ts
  
  ffmpeg -i "concat:intermediate1.ts|intermediate2.ts" -c copy -bsf:a aac_adtstoasc m.file.mp4
  
  
  
  MP4Box -add m.file.mp4 -isma mf.file.mp4
  
  mv mf.file.mp4 m.file.mp4

• FFmpeg low framerate when adding audio

  22 juillet 2021, par Massi

  we are sending a video from a Linux PC with GPU (Alienware M15 R2 so very strong in hardware) connected to a Logitech Brio 4K resolution camera.
We are using ffmpeg and in particular the following command :

  


  ffmpeg -re -hwaccel cuvid -hwaccel_output_format cuda -f v4l2 -input_format mjpeg -framerate 30 -video_size 3840x2160 -i /dev/video4 -f pulse -i default -c:v h264_nvenc -tune ull -preset llhq -zerolatency true -pix_fmt rgb0 -c:a aac -aac_coder fast -ar 44100 -b:a 256k -b:v 25000k -threads 0 -f flv "rtmp ://192.168.1.1/WebRTCAppEE/XXX"

  


  As you can see this is the part related to audio "-c:a aac -aac_coder fast -ar 44100 -b:a 256k"
If we send the script WITHOUT the audio part, we see it very fluid even in 4K resolution, with 30 FPS, but of course with no audio.
If we send the script WITH the audio part, the FPS goes down to 19-20 and the video is no more fluid. In this case we tried also to downgrade the video quality, but the result is always the same, the video is not fluid, even if the PC has not the CPU and GPU very loaded.
Would you suggest another script or some correction in order to avoid this problem and stream a video getting both video and audio from a device ?

  


• How to use Docker FFMPEG and HLS on my website [closed]

  13 septembre 2023, par NormalUser

  I want to use a Docker container to convert an mkv video to an HLS "video". This is my command for it :

  


  docker run --rm \
  -v /mnt:/config \
  linuxserver/ffmpeg \
  -i "/config/test.mkv" \
  -c:v copy \
  -c:a copy \
  -sn \
  -f hls \
  -hls_list_size 0 \
  /config/hls/output.m3u8


  


  when i run this command everything is created correctly, with VLC i can use the m3u8 file only Video.js says "The media could not be loaded, either because the server or network failed or because the format is not supported". I have also set the audio codec and video codec to AAC and 264 for testing but it didn't work any better.
Ich nutze Video.js und wenn ich auf einem anderen Rechner wo ich kein docker nutzen muss geht m3u8 im web aber nicht bei vlc mit diesem befehl.

  


  ffmpeg -i input.mkv -c:v h264 -master_pl_name master.m3u8 -hls_time 10 -hls_list_size 0 -f hls -map 0 -c:a aac -b:a 128k -strict -2 -vf "subtitles=input.mkv" -map a -map v -map s -var_stream_map "a:0,v:0,s:0 a:1,v:1 s:1" test/stream_%v.m3u8


  


  auf die verzeichnisse braucht ihr kein rücksicht nehmen die habe ich verändert