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• qsvenc_hevc : allow user set more coding options

  5 novembre 2020, par Haihao Xiang

  qsvenc_hevc : allow user set more coding options
  The SDK supports NalHrdConformance, RecoveryPointSEI and AUDelimiter for
  
  hevc encoder, so we may allow user to set these coding options like as
  
  what we did for h264_qsv encoder.
  Signed-off-by : Haihao Xiang <haihao.xiang@intel.com>
  
  Signed-off-by : Zhong Li <zhongli_dev@126.com>
  

  • [DH] libavcodec/qsvenc.c
  • [DH] libavcodec/qsvenc_hevc.c

• ffmpeg in bash only works on every second file

  5 août 2016, par kay

  ---

  EDIT :

  The Solution is to change the original ffmpeg-call below to the following :
  ffmpeg -nostdin -loglevel 16 -i "$dir/$var" -map_channel 0.0.0 "$left" -map_channel 0.0.1 "$right"
  where the -nostdin is the crucial thing.
  For reference see apply ffmpeg to many files (comment by macmichael01)

  ---

  I’m trying to convert all .wav-files in a given directory and it’s subdirectorys into two mono-files each with the following bash script. The crucial part is almost at the bottom - the ffmpeg call :

  #!/bin/bash
  
  # "[One] Stereo [file] to two mono [files] - stereo22mono"
  
  
  
  # Syntax ffmpeg siehe: https://trac.ffmpeg.org/wiki/AudioChannelManipulation
  
  
  
  
  
  ls -R $1 > .s22mtmp.txt
  
  
  
  while read -r line || [[ -n "$line" ]]; do
  
  
  
      var=$line
  
      tst=$var
  
      tst="${tst%:}"
  
  
  
      if [ -d "${tst%./}" ]       # is directory name
  
      then
  
          dir=$tst
  
  
  
      elif [ -f "$dir/$var" ]     # is file name
  
      then
  
          left=$dir/left_$var
  
          right=$dir/right_$var
  
  
  
          #loglevel 16 = only errors
  
          # -i ...-> input file
  
          # ffmpeg ... [SOURCE] ... [TARGET1] ... [TARGET2]
  
          ffmpeg -loglevel 16 -i "$dir/$var" -map_channel 0.0.0 "$left" -map_channel 0.0.1 "$right"
  
      fi
  
  
  
  done < .s22mtmp.txt
  
  
  
  
  
  rm .s22mtmp.txt

  It almost works - besides the fact, that it only does it’s job on only every second file, although the for-loop correctly goes through all files (watched it with echo) and calls ffmpeg.
  I thought it might be that ffmpeg has not finished it’s assigned work by the time it is asked to work on the next file and therefore just refuses, which seems to be true.
  Because I made one try with disowning every call of ffmpeg like so :

  ffmpeg -loglevel 16 -i "$dir/$var" -map_channel 0.0.0 "$left" -map_channel 0.0.1 "$right" & disown

  This worked almost, the problem was just that kind of hundreds of processes and multiple times more threads where starting to run and wouldn’t complete in a reasonable time, so I arborted. :D
  But at least it didn’t skip every second file anymore with that kind of call.

  Can anyone give me a hint, how to get this done ? Would be very thankful.. it’s actually the first time I’m trying with bash scripts.
  Thanks in advance !

• Splitting audio by vocal / voice

  1er octobre 2020, par ML85

  I am working with audio file using webrtcvad and pydub. The split of any fragment is by silence of the sentence.
Is there any way by which the split can be done at each vocal (after each spoken word) ?
If librosa/ffmpeg/pydub has any feature like this, can split is possible at each vocal ? but after split, I need start and end time of the vocal exactly what that vocal part has positioned in the original file.
One simple solution or way to split by ffmpeg is also defined by :

  


  https://gist.github.com/vadimkantorov/00bf4fbe4323360722e3d2220cc2915e

  


  but this is also splitting by silence, and with each padding number or the frame size, the split is different. I am trying split by vocal.