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• Not able to run the final step of running supervisord for plumi

  1er avril 2021, par manic_startup

  on the github page https://github.com/plumi/plumi.app
I am on the final step of Step 6. see below section

  


  =========================

  


  Step 6 : start supervisord
With plumi buildout having finished and ffmpeg installed on our system, it's time to run supervisord :

  


  root@user :/home/plumi.app# ./bin/supervisord

  


  ========================

  


  When I type in the above on CentOS 7 it says "bash : ./bin/supervisord : No such file or directory

  


  I had to change some things in step 5 "Step 5 Install ffmpeg" for the centos section there are two urls in that section pointing to some repos. They did not work so I had to find some other ones on the Internet. The ones I used where.
https://dl.fedoraproject.org/pub/epel/7/x86_64/Packages/e/epel-release-7-13.noarch.rpm

  


  http://ftp.riken.jp/Linux/atrpms/el7-x86_64/atrpms/stable/atrpms-repo-7-7.el7.x86_64.rpm

  


  The first one looks the same but it is different also the only release available was 7-13 so i used that.
The second one is a different url but the file is the same.

  


  also in that section is asks to edit /etc/yum.repos.d/atrpms.repo. It asks to change the base URL to a URL similar to the what is asks when it asked to download from the second repo above. Obviously that url is different now so I changed it to this instead.
http://ftp.riken.jp/Linux/atrpms/el$releasever-$basearch/atrpms/stable/

  


  After this I asks to install ffmpeg this did not work so I used the below guide
https://linuxize.com/post/how-to-install-ffmpeg-on-centos-7/

  


  Then came the section 6 to install supervisord as explained at the start this did not work. Now im stuck !

  


  I have also realised that when I get to the following command in step 4.

  


  ./bin/python bootstrap.py && ./bin/buildout -v

  


  It fails and says "Error : couldn't find distribution for 'hachoir-parser==1.3.4' and bombs out. I have tried to find this file but cant install it and dont know if i even have the correct file. not sure what to do.

  


• Merge Audio and Video on Uno Platform

  27 mars 2021, par trungnt2910

  I am trying to merge an audio stream and a video stream into a single file, on the Uno Platform, particularly for WebAssembly.
  
I already know that the normal, desktop-only way is by calling ffmpeg, and I also found a C# only way for UWP here.
  
However, the code used Windows.Media.Editing which is not implemented in Uno.
  
I know there is a ffmpeg library port for WASM here, but I don't know how to call it from my Uno web application.

  


  So are there any ways to merge an audio stream and a video stream to a single file, on the Uno platform for WASM ?

  


• m3u8 hls stream to wav in one step with ffmpeg

  17 février 2021, par Marinos K

  I'm using to ffmpeg to extract 10" snippets in WAV audio from a m3u8 hls stream in two steps like this :

  


  ffmpeg -i XXXX.m3u8 -t 10 -c copy -bsf:a aac_adtstoasc -vn output.acc
ffmpeg -i output.acc output.wav


  


  How can I do it in just one step to avoid the intermediate file and maybe speed the process ?

  


  I tried directly encoding the output with something like -c:a pcm_s24le, but this fails with a 'codec not supported by bitstream filter' error.

  


  I also tried piping the output of the first command to the next like this :

  


  ffmpeg -i XXX.m3u8 -t 10 -c copy -bsf:a aac_adtstoasc -vn pipe: | ffmpeg  -i pipe: output.wav


  


  and I get an 'pipe: : Invalid data found when processing input' error.

  


  any indications of what am I doing wrong, or any other ideas ?