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• Revert "rtpenc_chain : Don’t copy the time_base back to the caller"

  29 mai 2014, par Martin Storsjö

  Revert "rtpenc_chain : Don’t copy the time_base back to the caller"
  While it strictly isn’t necessary to copy the time base (since
  
  any use of it is scaled in ff_write_chained), it still is better
  
  to signal the actual time base to the caller, avoiding one
  
  unnecessary rescaling. This also lets the caller know what the
  
  actual internal time base is, in case that is useful info
  
  for some caller.
  This reverts commit 397ffde115f4e0482a007b672f40457596cebfc4.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavformat/rtpenc_chain.c

• Crop black padding and resize back to original 1920x1080

  1er juin 2020, par Satish Kumar

  I have video of resolution 1920x1080 (16:9 aspect ratio). When played its padded with black box on all sides. How to remove the black boxes to get the 1920x1080 video ?

  



  Screenshot of video

  



  Below the audio and video details :

  



  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Maths Logic.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.19.102
  Duration: 00:43:11.24, start: 0.000000, bitrate: 1475 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 1405 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 64 kb/s (default)
    Metadata:
      handler_name    : SoundHandler


  


• How to Gradually Fade Audio Volume in ffmpeg from X% to Y% and Back to X% ?

  23 juillet 2024, par DomingoSL

  I'm trying to process an audio file (bg-music.mp3) using ffmpeg to achieve specific volume changes at certain time intervals and trim the file at 30 seconds. The requirements are :

  


  

  • First 5 seconds at 100% volume

  


  • Fade from 100% to 10% volume between 5 and 7 seconds

  


  • From 25 to 27 seconds, fade audio to 100% volume and keep it until the end of the file

  


  • Trim the file at 30 seconds

  


  


  Here is the command I have used so far :

  


  ffmpeg -i bg-music.mp3 -filter_complex "[0]volume=1:enable='between(t,0,5)',volume='if(between(t,5,7),1-(0.45*(t-5)),0.1)':enable='between(t,5,25)',volume='if(between(t,25,27),0.1+(0.45*(t-25)),1)':enable='gt(t,27)'" -t 30 output.mp3


  


  While this command processes the file, the volume changes are not gradual between the specified intervals (5 to 7 seconds and 25 to 27 seconds). Instead, the volume changes abruptly rather than smoothly transitioning. Here's the result

  


  How can I correctly apply a gradual volume fade using ffmpeg to meet these requirements ?