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• Extract Progress tone from Audio file

  15 février 2017, par spicyramen

  Is there a way to extract Progress tone frequency and duration from an audio file (Audacity, VLC, ffmpeg, etc.)

  I need to configure Freeswitch spandsp.conf.xml for India.

  I collected the audio file where I can hear the tone, wondering if there is a tool to extract and configure the settings required in Freeswitch.

  Current non-working config :

     
  
       <descriptor>
  
          <tone>
  
           <element freq1="2100" freq2="0" min="700" max="0"></element>
  
          </tone>
  
          <tone>
  
       <element freq1="400" freq2="0" min="384" max="400"></element>
  
           <element freq1="0" freq2="0" min="200" max="224"></element>
  
           <element freq1="400" freq2="0" min="384" max="400"></element>
  
           <element freq1="0" freq2="0" min="1968" max="1984"></element>
  
      </tone>
  
          <tone>
  
           <element freq1="425" freq2="0" min="256" max="272"></element>
  
           <element freq1="0" freq2="0" min="240" max="256"></element>
  
           <element freq1="425" freq2="0" min="256" max="272"></element>
  
           <element freq1="0" freq2="0" min="224" max="240"></element>
  
      </tone>
  
          <tone>
  
           <element freq1="400" freq2="0" min="700" max="760"></element>
  
           <element freq1="0" freq2="0" min="700" max="760"></element>
  
           <element freq1="400" freq2="0" min="700" max="760"></element>
  
           <element freq1="0" freq2="0" min="700" max="760"></element> 
  
      </tone>
  
       </descriptor>

  Image of progress tone.

  

• opus_pvq : improve PVQ search for low Ks

  24 février 2017, par Rostislav Pehlivanov

  opus_pvq : improve PVQ search for low Ks
  Since the probelm mentioned only happened when the phase was negative
  
  (e.g. the sum had to be decreased), only discarding dimensions with a
  
  zero pulse in that case restored the search’s previously low distortion
  
  at low Ks when the phase is never negative.
  Signed-off-by : Rostislav Pehlivanov <atomnuker@gmail.com>
  

  • [DH] libavcodec/opus_pvq.c

• FFMPEG corruption concat

  11 avril 2017, par Please Help

  When I run

  ffmpeg -f concat -i resizedvideolist.txt -c copy concatenated_time.mp4 2>&1

  it concatenates all the videos in the txt, but there is one video around halfway through that get glitched out. The audio just doesn’t play for that video, but then starts playing on the next video, so it has been delayed. Then somewhere the audio managed to catch up and gets back in sync. Seems like some major corruption going on here.

  I do not know how to fix this as the codec is the same as all the other vidoes, H.264, it is an mp4 like the others. The individual video file runs fine as it is, and it already is in the same timescale, because before this ffmpeg command, I ran

  ffmpeg -i ./tempDownloadedMemes/$videoFileName -filter_complex 'scale=1080:-1,pad=1080:1080:(ow-iw)/2:(oh-ih)/2:0x2F2F2F' -video_track_timescale 15360 ./resizedVideos/resized_videoFileName 2>&1

  To be honest I don’t even know what timescale is, but I read that it needs to be the same for it to work. I deleted the video from the list, tried this same command, and the problem was gone at the same time in the video that it would have appeared. It seems like it is something to do with that one file itself. Any known issues/workarounds on concat bugs ? This is very important to me. Thanks.