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• libavdevice/avfoundation.m : fix potential unreleased lock issue

  26 août 2021, par Chengfeng Ye

  libavdevice/avfoundation.m : fix potential unreleased lock issue
  The problem here is that the lock ctx->frame_lock will become
  
  an unreleased lock if the program returns at patched lines.
  Bug tracker link : https://trac.ffmpeg.org/ticket/9386\#ticket
  Signed-off-by : Chengfeng Ye <cyeaa@connect.ust.hk>
  

  • [DH] libavdevice/avfoundation.m

• libavdevice/avfoundation.m : fix protential unreleased lock issue

  26 août 2021, par Chengfeng Ye

  libavdevice/avfoundation.m : fix protential unreleased lock issue
  The problem here is that the lock ctx->frame_lock will
  
  become an unreleased lock if the program returns at
  
  line 697, line 735 and line744.
  Bug tracker link : https://trac.ffmpeg.org/ticket/9385\#ticket
  Signed-off-by : Chengfeng Ye <cyeaa@connect.ust.hk>
  

  • [DH] libavdevice/avfoundation.m

• How to stop a sound when certain other sound is inserted in the mix in ffmpeg ?

  3 avril 2022, par Antonio Oliveira

  I'm using a ffmpeg command that takes a set of sounds, mixes them into a single file, separating them by certain time intervals.

  


  Below is how my command is today.

  


  ffmpeg -i 
close_hh.wav    -i \
crash_l.wav     -i \
crash_r.wav     -i \
floor.wav       -i \
kick_l.wav      -i \
kick_r.wav      -i \
open_hh.wav     -i \
ride.wav        -i \
snare.wav       -i \
splash.wav      -i \
tom_1.wav       -i \
tom_2.wav       -i \
  tom_3.wav  -filter_complex  " [6]adelay=0|0[note_0];  [0]adelay=360|360[note_1];  [6]adelay=1260|1260[note_2];  [0]adelay=1537|1537[note_3];  [6]adelay=2494|2494[note_4];  [5]adelay=2767|2767[note_5];  [0]adelay=2969|2969[note_6];  [6]adelay=3673|3673[note_7];  [5]adelay=3924|3924[note_8];  [0]adelay=4132|4132[note_9];  [0][note_0][note_1][note_2][note_3][note_4][note_5][note_6][note_7][note_8][note_9]amix=inputs=11:normalize=0" record.wav


  


  This is the resulting audio that this command generates :

  


  ffmpg record.wav : https://drive.google.com/file/d/1LFV4ImLKLnRCqZRhZ7OqZy4Ecq5fwT3j/view?usp=sharing

  


  The purpose is to generate a drum recording, so I would like to simulate the dynamics of the hi-hat sounds : When the closed hi-hat is played, the open hi-hat will stop playing immediately if it is still sounding. The same behavior does not happen for any of the other sounds.

  


  One point that makes this a little more challenging is that other sounds can also be played between open hi-hat and closed hi-hat strikes, and theoretically the sound interruption behavior should work normally.

  


  Below is a recording demonstrating the expected result. (My app already reproduces the sound result I need internally, so I just made a simple recording with the microphone to illustrate)

  


  mic record.wav https://drive.google.com/file/d/19x19Fd_URQVo-MMCmGEHIC1SjaQbpWrh/view?usp=sharing

  


  Notice that in the first audio (ffmpeg record.wav) the first sound (open hi-hat) continues playing after the second is played.
In the second audio (mic record.wav) the first sound stops immediately after the second sound is played.

  


  How should the ffmpeg command be to get the expected result ?