March 05, 2016
Hello, today post is the second one in series about Celery in Django. Today I write about ffmpeg.
In my application transcoding will be performed by ffmpeg. Why is that?
First of all, it’s free & open source. So I don’t have to pay to use it and I like using the open source tools. Second thing is that ffmpeg is more than enough for my task. It has a lot of features including recording, streaming and transcoding both video and audio.
So how to use it? For this project, the ffmpeg needs to be compiled with libmp3lame for mp3 files encoding, libvorbis for ogg format and enabled non-free for ac3. There is guide on ffmpeg site how to compile ffmpeg build. Also, make sure that you have cookies and tea with you while installation can take even 30 minutes.
After everything is setup all you need to do is:
$ ffmpeg -i mp3_file.mp3 wav_file.wav $ ffmpeg -i mp3_file.mp3 ogg_file.ogg $ ffmpeg -i mp3_file.mp3 ac3_file.ac3
The code above will transcode mp3 files into provided format. In my application one celery task will be called with subprocess, then another celery task will save the output of the first task to django model. This is all for today post but next week I will be building the celery tasks and integrating them with django.