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• lavc/vaapi_av1 : Avoid sending the same slice buffer multiple times

  8 mai 2024, par David Rosca

  lavc/vaapi_av1 : Avoid sending the same slice buffer multiple times
  When there are multiple tiles in one slice buffer, use multiple slice
  
  params to avoid sending the same slice buffer multiple times and thus
  
  increasing the bitstream size the driver will need to upload to hw.
  Reviewed-by : Neal Gompa <ngompa13@gmail.com>
  
  Signed-off-by : David Rosca <nowrep@gmail.com>
  
  Signed-off-by : Haihao Xiang <haihao.xiang@intel.com>
  

  • [DH] libavcodec/vaapi_av1.c

• ffmpeg trim mp3 - determine precisely the start and end times of section to be trimmed

  4 février 2019, par Ahmed Khalil

  I have a long mp3 track of an audio book (more than 9 hours long) that I would like to trim using ffmpeg.

  The sample code below is used to trim an mp3 section by providing the start and end times. However, when I determine the start and end times, then checking the output file, it’s not as precisely as I want, sometimes several minutes ahead/before the desired point.

  import subprocess
  
  file = r'audio book.mp3'
  
  track_name = "trimmed section"
  
  output = r'D:\{0}'.format(track_name)
  
  start = '01:26:04'
  
  end = '01:33:17'
  
  
  
  d = subprocess.getoutput('ffmpeg -i "{0}" -ss {1} -to {2} -c copy {3}.mp3"'
  
                       .format(file, start, end, output))
  
  
  
  print(d)

  Is there a way to determine with accuracy the real start and end time of an mp3 audio track, to be given afterwards as inputs to the code...to trim the desired sections all at once, without the need to adjust/fine-tune the start and end time manually ??

• concat 2 mini audio files and make a loop and add a background music

  11 octobre 2020, par Johny Sharma

  I Need to concatenate 2 small audio files with loop and add background music in a single command.

  



  I am capable to concatenate two audio files with a background music. My above given code is working.

  



  ffmpeg -i 1.mp3 -i 2.mp3 -i background.mp3 
-filter_complex "[0:0][1:0]concat=n=2:v=0:a=1,volume=1dB,aformat=fltp, pan=stereo|c0=c0|c1=c0[a0]; 
[2]volume=0.5dB,aformat=fltp,pan=stereo|c0=c0|c1=c1[a1];[a0][a1]amix=inputs=2:duration=longest,aformat=fltp[a]"
-map "[a]" -strict -2 -y output.mp3


  



  but i want to a make a loop of the concatenated files till the end of the background music. background music is longer than approx 5 times from concatenated files.

  



  If someone can suggest a single command solution.

  



  I know about amovie tag but unfortunately its not possible to use in here because amovie requires file name which is not possible with concatenated files as per my knowledge.

  



  Can anyone help me how can i achieve my goal !

  



  Thanks