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• How to generating waveform from video & show it with video

  25 novembre 2016, par Salil

  We are using Rails as a backend & AngularJS on Front End side in my App where we need to show Video & audio waveform of that video.

  We are using ’wavesurfer.js’ to show the waveform on Front End side & ’node-pcm’ to generate pcm from video file on BackEnd side.

  This is working as expected but in some of the videos while creating waveform from pcm data instead of showing small sine waves we get flat line.
  Also it takes too much time to show the waveform for every page reload.

  To overcome this issue we are planning to create waveform image using ffmpeg

  ffmpeg -i 'https://s3.amazonaws.com/aadasdsadsadasdas/xyz.mp4' -filter_complex showwavespic -frames:v 1 output.png

  This is working fine but it also takes too much time (Ofcourse only once ) to generate the image for remote video (i.e. We are saving videos on S3)

  Problem with this i don’t get any library to integrate the waveform image with the Video.

  Can someone suggest any better approach related to this.

• requesting script for compressing mp3 files recursively using ffmpeg

  3 mai 2017, par Guddla Rupesh

  Hi I am Rupesh from India. I have a directory of size 65 GB which contains 2500 folders and 7000 mp3 files with 64 kbps bitrate.

  I have installed Windows 8 and Linux with ffmpeg on my system.

  I want to convert all these files to 16 kbps recursively I mean maintain folder structure of source. I have searched web for script and found some code but none of them provided what I want. I have searched even GUI frontend for ffmpeg and found some software but they don’t have option to convert all these files recursively and some don’t have option to convert to lower bitrate.

  I have read ffmpeg manual pages and those was difficult to understand and even I don’t have scripting experience.

  Can you create a script to perform the following steps
  1) The script must compress files in each and every directory maintaining directory structure.
  2) All files must be compressed to 16 kbps and 11500 samples per second with highest quality.
  3) If any errors are encountered during the process the corresponding file information ie., file name with path must be stored in a seperate text file for future viewing.
  4) After the process has been completed the system must shutdown.

  I want accurate compression. Please try to create a bash script ( linux ) or a batch script ( Windows ) and post the script.

  Regards,
  Rupesh.

• How do I pipe a stream to ffmpeg using the subprocess library

  15 juin 2020, par Jackson

  Using the following command I can pipe the stream data from streamlink to ffmpeg and save the stream as an mp4 file.

  



  streamlink https://www.youtube.com/watch?v=UmclL6funN8 best -O | ffmpeg -i pipe:0 -c:v copy -c:a copy "test.mp4"


  



  I would like to implement this inside a Python script but I am not able to get the stream to pipe into the ffmpeg process.

  



  url = "https://www.youtube.com/watch?v=UmclL6funN8"
process = subprocess.Popen(("streamlink", url, "best", "-O"), stdout=subprocess.PIPE)
output = subprocess.check_output(('ffmpeg', '-i', 'pipe:0', '-c:v', 'copy', '-c:a', 'copy', "test.mp4"), stdin=process.stdout)


  



  Can anyone see where I am going wrong ?