**** DONE Fixing aspect ratio on Hubsan x4 H107d recordings with Linux and ffmpeg :blog:software:hardware:videos:diy:
CLOSED: [2014-04-19 Sat 15:10] SCHEDULED: <2014-04-19 Sat>
:PROPERTIES:
:CREATED:  [2014-04-19 Sat 11:55]
:ID:       2014-04-19-recoding-h107d-videos
:END:
:LOGBOOK:
- State "DONE"       from "NEXT"       [2014-04-19 Sat 15:10]
:END:


I own a [[http://www.banggood.com/Wholesale-Hubsan-H107D-FPV-X4-RC-Quadcopter-RTF-With-5_8G-FPV-6CH-Transmitter-p-68571.html?p%3DHX0712404902201401OF][Hubsan x4 H107d FPV]] quadcopter ([[id:2014-04-17-hubsan-x4][my German blog post]]). Its
video recordings result in 720x240 aspect ratio files. However, they
are crimped. If you force your video playback tool to use 4:3 aspect
ratio, the videos are OK again.

In order to convert a H107d video permanently to the correct aspect
ratio and probably to save some Megabytes as well, you can stick to
[[https://cali-bros.com/forum/index.php?PHPSESSID%3D099b7314f53d75d491b922aebbc57d53&topic%3D11.0][the usual GUI tools]], mainly for MS Windows.

I wrote a shell script which does the conversion using [[http://www.ffmpeg.org/][ffmpeg]], a
GNU/Linux command line tool. You can find [[https://github.com/novoid/recode-h107d-videos][my recoding script on
github]].

---------------

With this, you can use following shell command to convert multiple
recordings in parallel:

#+BEGIN_SRC sh
recode-h107d-videos.sh *.AVI
#+END_SRC

In case you want to add time-stamps to the file names as well (make
sure that the real time clock in your Hubsan remote control is set
accordingly), you might as well be interested in [[https://github.com/novoid/date2name][my date2name script]].

With following commands, you add time-stamps to the files before you
recode them:

#+BEGIN_SRC sh
date2name --withtime *.AVI
recode-h107d-videos.sh 201*.AVI
#+END_SRC

This way, you end up with files like follwing examples:

#+BEGIN_SRC sh
2014-04-18T20.01.48_002 -- h107d recoded.avi
2014-04-18T19.04.40_004 -- h107d recoded.avi
2014-04-18T19.05.52_005 -- h107d recoded.avi
#+END_SRC