GoProTelemetryJSONtoVideo.py

#!/usr/bin/env python
# coding: utf-8

# In[61]:


import PIL.Image as Image
import PIL.ImageDraw as Draw
import PIL.ImageFont as Font
import json
import os.path
import numpy
import cv2


# In[69]:


size = (1080, 190)

def generate_textimage(kph, alt):
   im = Image.new('RGB', size, (0, 0, 255))
   draw = Draw.Draw(im)
   font = Font.truetype('/System/Library/Fonts/Menlo.ttc', 100)
   text = '   Speed {:>4} km/h\nAltitude {:>4} m'.format(int(kph * 10) / 10, int(alt))
   txW, txH = draw.textsize(text, font = font)
   draw.text((im.width - txW, im.height - txH), text, fill = (255, 255, 255), font = font)
   return cv2.cvtColor(numpy.array(im, dtype=numpy.uint8), cv2.COLOR_RGB2BGR)


# In[73]:


def json2video(path2json, path2video, fps = 60):
    d = json.load(open(path2json))
    out = cv2.VideoWriter(path2video, cv2.VideoWriter_fourcc(*'MP4V'), fps, size)
    for i, sample in enumerate(d['1']['streams']['GPS5']['samples']):
        im = generate_textimage(sample['value'][4] * 3.6, sample['value'][2])
        out.write(im)
    out.release()
json2video('GX030067_1_GPS5.json', 'GX030067_GPS.mp4')