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• How to convert rtp codec in online to amr-nb/wb (octet-align = 0) by FFMPEG ?

  28 janvier 2019, par Mehdi Talebi

  rtp is received as input with different payload types such as amr-nb and WAVE.It is necessary to convert all of them to amr-wb but in bandwidth-align (NOT octet-align).
  I use this command to convert :

  ffmpeg -re -i rtp ://127.0.0.1:1235 -ar 16000 -ab 19.85k -acodec libvo_amrbenc -f rtp rtp rtp ://127.0.0.1:1236

  But the out put (SDP) is like this :

  1. v=0
  2. o=- 0 0 IN IP4 127.0.0.1
  3. s=No Name
  4. c=IN IP$ 127.0.0.1
  5. t=0.0
  6. a=tool:libvaformat 58.25.100
  7. m=audio 1236 RTP/AVP 97
  8. b=AS:19
  9. a=rtpmap:97 AMR-WB/16000/1
  10. a=fmtp:97 octet-align =1

  My problem is octet-align =1, i need octet-align = 0. Do you know any argument to set this in the command ?

• How to improve my current method of generating an audio transcript from an online video

  23 janvier 2019, par 5areductase

  I am working on a project that needs to download and analyze online videos. Most of the videos are hosted on YouTube but some are hosted on Facebook.

  My task is to generate an audio transcript for every video.

  My colleague was using a series of programs sequentially given some {link} :

  youtube-dl -f '(mp4)[height = 360][width = 640]' {link} -o '{out_1}.%(ext)s'
  
  
  
  ffmpeg -i {out_1} -vn {out_2}.wav
  
  
  
  sox {out_2} {out_3} channels 1 rate 16000
  
  
  
  pocketsphinx_continuous -infile {out_3} -samprate 16000 -hmm {ACOUSTICMODEL} -dict {DICTIONARY} -lm {LANGMODEL} -fwdflat yes -bestpath yes 2> error.log | tee {out_4}.log && rm error.log

  Note that there’s an extra ffmpeg step to extract the audio, instead of simply directly downloading it with youtube-dl because video is needed as well.

  Everything works correctly as far as I can tell, but I’ve never really dealt with audio before so I’m not sure if this is the best way to go about it.

• How to add html elements to a video online

  27 septembre 2018, par Gabriele

  I need to be able to edit a video with online technologies (Javascript or with some Backend code) and overlay on the original video whatever html elements (maybe even animated elements with css) and download the new video edited.

  What is the best way to do it ?

  I’ve read about CCapture.js that captures videos from a canvas, but I can’t get it to work and I’m not sure it’s what I’m looking for. I’ve read about some FFMPEG plugins to make it work on the server and use it with some backend languages but I don’t know if it would get the work done as I need it.

  For clarity, you know how Instagram can edit your video after you take it adding text or images ? I need to be able to edit a video like that, adding html elements on it.

  Thanks in advance for helping.