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The current version is a much improved version upon this by Gaurav. Find the project here: https://github.com/igauravsehrawat/meetup-utilities

Chennaipy-video-helpers

This repository contains helper scripts and commands to create meetup videos for Chennaipy.

Steps

Install ffmpeg, sox, imagemagick, ghostscript
- On OSX, you can directly use brew for the above:
```
  $ brew install ffmpeg sox imagemagick ghostscript
```
- On Ubuntu, installing ffmpeg is a bit tricky, but these commands should get you started:
```
  $ sudo add-apt-repository ppa:mc3man/trusty-media
  $ sudo apt-get update
  $ sudo apt-get dist-upgrade
  $ sudo apt-get install ffmpeg imagemagick ghostscript sox
```
  You can read more about the ffmpeg ppa here
- On Windows, you can individually download and install prebuilt binaries for the packages:
  - ffmpeg, 64-bit static should do
  - sox
  - imagemagick
  - ghostscript
  - you might have to manually add them to PATH if not done automatically.
Convert the audio to a wav (wav files are faster to process, and easier to manipulate using sox)
```
  $ ffmpeg -i bigdata_audio.m4a audio.wav
```

Remove noise from audio

  $ sox audio.wav -n trim 0 1.5 noiseprof noise.profile
  $ sox audio.wav cleaned.wav noisered noise.profile 0

Convert the pdf to individual images using

  $ convert -density 150 -resize 1920x1080 bigbigdata.pdf individual_images/%d.png

Notedown timestamps from audio at which slide is to be changed

Generate segments of video for those times

  $ python create_video_segments.py individual_images\ individual_video\ 00:02 00:40 1:25 2:10 3:35 3:50 5:30 7:22 7:42 8:02 10:03 12:10 13:10 15:12 16:00 17:25 18:30 20:00 21:18 21:23

Trim the audio if required

  $ sox cleaned.wav final.wav trim 00:02 =21:20

Generate a concatvideos file to be used by ffmpeg to join the videos to form a single one
```
  $ generate_concatvideos.py individual_video\
```

Run the ffmpeg script to create the joined video

  $ ffmpeg -f concat -i concatvideos -c copy joined.mp4

Join the generated video with the final audio

  $ ffmpeg -i joined.mp4 -i final.wav -shortest -preset ultrafast -q 0 final.mp4

Adjust volume in the video

  $ ffmpeg -i <input_video_name> -af 'volume=2.5<or 1x>' -preset ultrafast <output_video_name>

Trim the video if required

  $ ffmpeg -ss <start_time_in_hh:mm:sec> -i <input_video_name>  -t <time_duration_in_hh:mm:sec> <output_video_name>

scale video to 16:9

  $ ffmpeg -i final.mp4 -vf pad="ih*16/9:ih:(ow-iw)/2:(oh-ih)/2" -preset ultrafast -acodec copy final2.mp4

Generate the title image

  $ sed -e 's/%title%/My Python Experience/g' -e 's/%speaker%/Shrikant Giridhar/g' -e 's/%month%/Feb/g'  -e 's/%year%/2017/g' title-template.svg > title.svg

convert the svg to a png

  $ convert title.svg -density 150 -resize 1920x1080! title.png

create title video with empty audio

  $ ffmpeg -loop 1 -i title.png -f lavfi -i aevalsrc=0 -acodec libvo_aacenc -ab 128k -map 0:0 -map 1:0 -t 7 -preset ultrafast -qp 0 title.mp4

create the uploadable version

  $ ffmpeg -i title.mp4 -i final2.mp4 -filter_complex "[0:0] [0:1] [1:0] [1:1] concat=n=2:v=1:a=1 [v] [a]" -map "[v]" -map "[a]"  uploadable.mp4

Note: Use -preset ultrafast if cpu is consistently high, but increases overall filesize. Using it is not recommended.

gnurenga/chennaipy-video-helpers

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Chennaipy-video-helpers

Steps