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• FFmpeg creates a small audible dropout_transition pre and post audio overlay, how do I remove this ?

  30 juillet 2019, par nwood21

  file1.wav is 25 minutes long. file2.wav is 20 seconds long. File2.wav delays to the end of the file1.wav and the two are "amixed" together. The delay works perfect and overlays into the correct location at the end of the 25 minute file1.wav file. My problem is the blending of the two clips together — I believe the dropout_transition (even though it’s set to 0) still creates an audible undesireable "dip" before and after file2.wav overlays onto file1.wav. Is there a way to ensure that no "dips" happen at all ? The two clips are well-balanced with either using mixing software so I don’t want them change at all, but I also don’t want distortion. Is this possible ? Is it possible to use amerge instead of amix as an alternative ? I tried but I can’t figure out the correct syntax. Help from geniuses appreciated !

  I’ve tried various different dropout_transition settings and volume settings...this is as close as I’ve come to desired results. Like I said, I can’t figure out the correct syntax to use amerge instead of amix.

  ffmpeg -i file1.wav -i file2.wav -filter_complex "[1]adelay=70751488S|#70751488S,volume=1[b];[0][b]amix=inputs=2:duration=first:dropout_transition=0,volume=2" /output.wav

• unable to adfd filter:a to ffplay

  25 mars 2021, par Eswar T

  Im working on a video editing project and im using ffmpeg for video rendering

  


  To play video before rendering i wana show it to user and i thought of using ffplay

  


  ffplay -i C:/Users/thota/OneDrive/Desktop/VET/test.mp4 -filter:a "volume="1.0",atempo="1.0"" -vf "transpose=2,transpose=2,setpts=1/"1.0"*PTS,scale="1280*720"" -aspect 16:9 D:/videos.mp4output.mp4


  


  but this is giving an error
Failed to set value 'volume=1.0,atempo=1.0' for option 'filter:a' : Option not found

  


  Please help with it

  


  Thank you

  


• ffmpeg overlay voice on a song with fade in and fade out

  22 octobre 2016, par Mehmed

  I have a fade in and fade out problem and used below code, but not completely resolve.
  I have a voice as voice.mp3 name with voice_length seconds length and a song that biggest from voice.
  I want mix with song from start_mix_time time.
  When voice start volume should be 0.2 and when voice end, volume return to 1.0.

  For example, if i have a voice by 10 s length and a song, song start playing and at position 3 s, starting to fade out to vol 0.2 and then, at 5 s, voice start over song and after 10 seconds, song fade in to vol 1 and play to end.

  Here is a sample :

  ffmpeg -i song1.mp3 -i voice2.mp3  -filter_complex "[0]asplit[a][b]; \
  
          [a]atrim=duration=voice_length,volume='1-max(0.25*(t-start_mix_time-2),0)':eval=frame[pre]; \
  
          [b]atrim=start=start_mix_time,asetpts=PTS-STARTPTS[song]; [song][1]amix=inputs=2:duration=first:dropout_transition=2[post]; \
  
          [pre][post]concat=n=2:v=0:a=1[mixed]" \
  
          -map "[mixed]" output.mp3

  @Mulvya