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• i want to join two ffmpeg command to gather

  11 décembre 2019, par Kishan Makani

  This command is for add video in to video :

  ffmpeg -i 1.mp4 -i over.mp4 -filter_complex
  "[0:v]setpts=PTS-STARTPTS,scale=224x400[top] ;[1:v]setpts=PTS-STARTPTS,scale=100x44[bottom] ;[top][bottom]overlay=x=115:y=346:eof_action=pass ;[0]volume=0.7[a1] ;[1]volume=0.3[a2] ;[a1][a2]amix=inputs=2[a]"
  -acodec aac -vcodec libx264 -map 0:v -map "[a]" out.mp4

  This command is for add water mark and username text in to video :

  ffmpeg -i 1.mp4 -i watermark.png -filter_complex
  "overlay=main_w-overlay_w-5:main_h-overlay_h-15,drawtext=fontfile=/path/to/font.ttf:text=‘@Unknown’ :
  fontcolor=white : fontsize=10 : box=1 : boxcolor=black@0.0 : boxborderw=5 :
  x=160 : y=380" -codec:a copy output.mp4

  If i want to execute this two command together then what i have to do OR how can i join this two command in one ?

• How to get an accurate duration of any audio file quickly ?

  27 septembre 2023, par Steve M

  There are many audio files in the wild encoded with VBR which don't have an accurate duration tag, and command line FFMpeg would output the following :

  



  


  Estimating duration from bitrate, this may be inaccurate

  


  



  (and indeed, it is)

  



  Using libav, we can see that this is tested with the has_duration() function from libavformat/utils.c

  



  I have an audio player that needs to get an accurate duration information using libav. I've tried completely decoding the file and counting the total number of samples decoded which is the usual recommendation (and is accurate), but this can take 10+ seconds on a 60 minute audio file, which is not acceptable.

  



  I notice that there are some closed source audio decoders and music playing apps which can get an accurate duration for these files immediately. There must be some cheap way of determining the accurate duration ? Perhaps a snippet or high-level description would help me out.

  


• FFMPEG command to mix audio and video with adjustable volume, plays till Video length and loop audio entire video

  10 mai 2020, par Tomin

  I have :

  



  

  • Video file of X length

  


  • Audio of Y length

  


  



  I am trying to achieve an output video that has the following qualities :

  



  

  1. The volume level of the added audio should be adjustable

  


  2. The audio should loop till the end of the video

  


  3. It should not break even if the input video does not have any audio

  


  4. I should be able to mute the audio of the source video if needed.

  


  5. All of the above, in the fastest possible way.

  


  



  I'm not well versed with FFMPEG, maybe some experts could help.