General

• en.wikipedia.org/wiki/Video_DownloadHelper
• Firefox: addons.mozilla.org/en-US/firefox/addon/video-downloadhelper/
• groups.google.com/g/video-downloadhelper-q-and-a?pli=1

Examples of Use

(So far only one documented here. More )

2021-05 Activity

1. Getting file(s), turned out got first file w/o any sound…. And – unsure exactly which setting/selection – but one of other tries got me a sound-only file (yes, at least GOT a sounds file)
   1. Physical Distancing and Crowd Density Monitoring Using Compu-1.mp4
      1. 28.8 MB – THIS IS the file w/ audio
   2. Physical Distancing and Crowd Density Monitoring Using Compu-2.mp4
      1. 431.8 MB
      2. Physical Distancing and Crowd Density Monitoring Using Compu-1.mp4.mediainfo.txt
      3. AVC
   3. Physical Distancing and Crowd Density Monitoring Using Compu.mp4
      1. 311.8 MB
      2. Physical Distancing and Crowd Density Monitoring Using Compu.mp4.mediainfo.txt
      3. MPEG-4 Visual
2. First step: merging audio and video files.
   1. One article with tips: itectec.com/superuser/how-to-merge-audio-and-video-file-in-ffmpeg/
   2. Executed command:
      ffmpeg -i ‘Physical Distancing and Crowd Density Monitoring Using Compu.mp4’ -i ‘Physical Distancing and Crowd Density Monitoring Using Compu-1.mp4’ -c copy output.mp4
3. Second step: skipping a fair amount of ‘marketing mumbo-jumbo and waiting for presenter’ video material (almost 5 minutes….! plus the actual presentation then actually also restarted almost one minute into the presentation.)
   First three attempts was to try find the most suitable start beteen mumbo-jumbo and actual presentation. Last execution was to also remove the presentation restart.
   1. ffmpeg -i output.mp4 -codec copy -ss 0:04:58 Physical.mp4
   2. ffmpeg -i output.mp4 -codec copy -ss 0:04:57 Physical.mp4
   3. ffmpeg -i output.mp4 -codec copy -ss 0:04:56 Physical.mp4
   4. ffmpeg -i output.mp4 -codec copy -ss 0:05:43 Physical.mp4
4. Third and last step: fixing name, renamed ‘Physical.mp4’ to
   Physical Distancing and Crowd Density Monitoring Using Computer Vision, SASGF 2021.mp4
5. A little bit later, cleaning up activities
   1. 1.59 GB – top folder size before cleaning up downloads and intermediate files
   2. Removing:
      1. 28.8 MB – Physical Distancing and Crowd Density Monitoring Using Compu-1.mp4
      2. 431.8 MB – Physical Distancing and Crowd Density Monitoring Using Compu-2.mp4
      3. 311.8 MB – Physical Distancing and Crowd Density Monitoring Using Compu.mp4
      4. 201.7 MB – Physical Distancing and Crowd Density Monitoring Using Computer Vision, SASGF 2021-0456.mp4 (variant with presentation restart was still included)
      5. 340.6 MB – output.mp4 (from merging full-length audio and video)
   3. 251 MB – size now of top folder
      (Did make and DO keep mediainfo text files on all files.)

1. First sharable link, 2021-05-20  06:34 US CT
   dropbox.com/s/1bfd9splfexvcxw/Physical%20Distancing%20and%20Crowd%20Dens[…]toring%20Using%20Computer%20Vision%2C%20SASGF%202021.mp4?dl=0
2. Still seems to work 2021-05-21 08:14 US CT, after reorganized Dropbox locations a little bit (moved folder with video contents and ALSO tweaked folder name ever so slightly).