init repo

.gitignore

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+node_modules

add_speed_overlay.sh

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+#!/bin/bash
+
+for videoFile in "$@"
+do
+    echo "Extracting gpx for $videoFile"
+   ./gopro-telemetry-exporter --input $videoFile --output "${videoFile%.*}.gpx" --GPS5Fix 3 --preset gpx --groupTimes 200
+   gpsbabel -i gpx -f "${videoFile%.*}.gpx" -x track,speed -o subrip -F - | grep -v Lat > "${videoFile%.*}.srt"
+   ffmpeg -i "${videoFile%.*}.srt" "${videoFile%.*}.ass"
+   sed -i 's/^Style: .*/Style: Default,SquareFont,12,\&Hffffff,\&Hffffff,\&H0,\&H0,0,0,0,0,100,100,0,0,1,1,0,1,10,10,10,0/' "${videoFile%.*}.ass"
+   ffmpeg -i $videoFile -vcodec h264_nvenc -vf subtitles="${videoFile%.*}.ass" -preset bd -b:v 20M "${videoFile%.*}.with_speed_overlay.mp4"
+done
+

gopro-telemetry-exporter

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+#!/bin/node
+const gpmfExtract = require('gpmf-extract');
+const goproTelemetry = require(`gopro-telemetry`);
+const fs = require('fs');
+const minimist = require('minimist');
+const _ = require('lodash');
+
+async function main(options) {
+  const res = await gpmfExtract(bufferAppender(options.input, 10 * 1024 * 1024));
+
+  function bufferAppender(path, chunkSize) {
+    return function (mp4boxFile) {
+      var stream = fs.createReadStream(path, { highWaterMark: chunkSize });
+      var bytesRead = 0;
+      stream.on('end', () => {
+        mp4boxFile.flush();
+      });
+      stream.on('data', chunk => {
+        var arrayBuffer = new Uint8Array(chunk).buffer;
+        arrayBuffer.fileStart = bytesRead;
+        mp4boxFile.appendBuffer(arrayBuffer);
+        bytesRead += chunk.length;
+      });
+      stream.resume();
+    };
+  }
+
+  goproTelemetry(res, _.omit(options, ['_', 'input', 'output']), telemetry => {
+    fs.writeFileSync(options.output, telemetry);
+  });
+
+}
+
+main(minimist(process.argv.slice(2)));

package.json

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+{
+  "name": "gopro-extract",
+  "version": "1.0.0",
+  "description": "",
+  "main": "gpx-extract.js",
+  "dependencies": {
+    "gopro-telemetry": "^1.1.34",
+    "gpmf-extract": "^0.1.21",
+    "lodash": "^4.17.20",
+    "minimist": "^1.2.5"
+  },
+  "devDependencies": {},
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC"
+}