requirements

• python 3
• node v12
• yarn 1.22
• ffmpeg 4.
• mariadb
• system encode utf-8

install & run api server.

virtualenv myenv
source myenv/bin/activate
pip install -r requirements.txt
FLASK_ENV=development python app.py

TODOS

Suite (Audio tool):

• merge track
• mix track
• trim silence
• reduce background noise
• generate transcript (for better SEO & socical)
• 1-1 interview

Podcast:

• create podcast from scratch
• import from existing podcast platform like Apple podcast, Soundcloud, AudioBoom, Spreaker, ...
• RSS feed for podcast
• Schedule Episode
• Podcast distribution to Apple podcast, Spotify, Google Music, TuneIn, Amazon Alexa, ...
• Audio search based on transcript, caption based on WebVTT format
• Embeded player inject to any webpage, blog platform, ....
• Podcast producer page/blog
• Podcast analytisc with basic metric like Unique user listen, location, browser/device, referal site, ...

Run flask CLI

FLASK_APP=cli.py flask <command-name>

format to mp3

ffmpeg -y -i end_music.wav -filter_complex "[0:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo[a0]" -map [a0] -ar 44100 -ac 2 -b:a 128k -acodec libmp3lame -f mp3 end_music.mp3

mix from intro_music.wav to clip.wav (trim first then add (atrim -> adelay))

ffmpeg -y -i clip.wav -i intro_music.wav -filter_complex "[0:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo[a0];[1:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo[a1];[a1]atrim=5.0:20.0[a1trim];[a1trim]adelay=5000|5000[aud1];[aud1]amix=1,apad[a];[a0][a]amerge[a]" -map "[a]" -ar 44100 -ac 2 -b:a 128k -acodec libmp3lame -f mp3 mix01.mp3

• format to 2 channel
• get from 5s - 20s of intro_music.wav
• add this to clip.wav at 5s
• format to mp3 output

crossfade audio 1,2 then mix 3 to [1,2]

ffmpeg -y -i intro_music.wav -i clip.wav -i end_music.wav -i effect_1.mp3 -i effect_2.mp3 -filter_complex "[1]acrossfade=d=10:c1=tri:c2=tri[aud1];[aud1][2]acrossfade=d=10:c1=tri:c2=tri[aud2];[3]adelay=5000|5000[aud3];[aud3]amix=1,apad[mixed];[aud2][mixed]amerge[mixed]" -map "[mixed]" -ar 44100 -ac 2 -b:a 128k -acodec libmp3lame -f mp3 mix01.mp3

crossfade audio 1,2 then mix 3 at 5sec, 4 at 10sec

ffmpeg -y 
-i intro_music.wav -i clip.wav -i end_music.wav -i effect_1.mp3 -i effect_2.mp3 
-filter_complex 
"[1]acrossfade=d=10:c1=tri:c2=tri[aud1];[aud1][2]acrossfade=d=10:c1=tri:c2=tri[aud2];[3]adelay=5000|5000[aud3];[4]adelay=10000|10000[aud4];[aud3][aud4]amix=2,apad[final];[aud2][final]amerge[final]" 
-map "[final]" 
-ar 44100 -ac 2 -b:a 128k -acodec libmp3lame -f mp3 mix01.mp3

[
  {
    "color" : "rgba(88, 196, 145, 0.44)",
    "end" : 33.529600000000002,
    "fdId" : 14,
    "label" : "intro_music.wav",
    "start" : 0,
    "type" : "crossfade"
  },
  {
    "color" : "rgba(167, 243, 110, 0.44)",
    "end" : 213.06326530612245,
    "fdId" : 16,
    "label" : "clip.wav",
    "start" : 33.529600000000002,
    "type" : "crossfade"
  },
  {
    "color" : "rgba(31, 108, 205, 0.44)",
    "end" : 226.89532879818591,
    "fdId" : 15,
    "label" : "end_music.wav",
    "start" : 213.06299999999999,
    "type" : "crossfade"
  },
  {
    "color" : "rgba(220, 169, 127, 0.44)",
    "end" : 90,
    "fdId" : 13,
    "label" : "effect_1.mp3",
    "start" : 89.859454999999997,
    "type" : "mix"
  },
  {
    "color" : "rgba(175, 144, 255, 0.44)",
    "end" : 32,
    "fdId" : 12,
    "label" : "effect_2.mp3",
    "start" : 15.458893,
    "type" : "mix"
  },
  {
    "color" : "rgba(203, 81, 127, 0.44)",
    "end" : 258.42496598639457,
    "fdId" : 14,
    "label" : "intro_music.wav",
    "start" : 226.89500000000001,
    "type" : "crossfade"
  }
]

Documentation

https://docs.graphene-python.org/en/latest/, https://github.com/graphql-python/flask-graphql https://vuejs.org/v2/guide/typescript.html

key must declare = with key list item to breadcrum root link

Fix GCE utf8 encode

echo "LC_ALL=en_US.UTF-8" >> /etc/environment
echo "en_US.UTF-8 UTF-8" >> /etc/locale.gen
echo "LANG=en_US.UTF-8" > /etc/locale.conf

On Linux, you need to install libsndfile using your distribution’s package manager, for example 

sudo apt-get install libsndfile1.

Frontend setup

yarn install

Compiles and hot-reloads for development

yarn serve

Compiles and minifies for production

yarn build

Lints and fixes files

yarn lint