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• Fix mismatched oc_mb_fill_cmapping11 signature.

  31 octobre 2014, par Tim Terriberry

  Fix mismatched oc_mb_fill_cmapping11 signature.
  oc_mb_fill_cmapping11() was defined without the last two parameters
  
   of its fellow mapping functions, meaning it got called with extra
  
   undeclared parameters.
  This could confuse the emscripten JavaScript cross-compiler's asm.js
  
   optimizations, as it's very picky about function signatures.
  Fixes #2068.
  
  Patch by Brion Vibber <brion@pobox.com>.
  git-svn-id : http://svn.xiph.org/trunk/theora@19261 0101bb08-14d6-0310-b084-bc0e0c8e3800
  

  • [DH] lib/state.c

• WebRTC Detect Orientation from Peer Video Stream

  30 mars 2018, par Daryl

  Using RecordRTC and WebRTC I am able to save a Peer MediaStream as a webm/video file. The orientation of the file differs based on the peer device. Meaning a 640x480 video is rotated clockwise or counter clockwise.

  To re-orient the recorded video, some of the videos need to be rotated "clockwise" and others need to be rotated "counter clockwise". I need a way to determine which direction to rotate the video. Otherwise, some videos will be right side up and others upside down.

  I attempted to look up the orientation, using ffprobe. However, the videos created do not have the "rotate" tag in the metadata.

  I have also been unable to find the orientation in the Peer video stream of the WebRTC object.

  I really thought that since the Video Element has the WebRTC Peer Stream displayed correctly in it, that I should be able to get the orientation from it.

• 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 ?