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• On masto

  Raymond Lutz • 02/02/2023 at 00:20 • 0 comments

  For those interested, I'm posting more frequent updates on my mastodon account (than here). They are tagged:
  

  https://mamot.fr/tags/atomicsynchronator

• Timeline object completed

  Raymond Lutz • 07/25/2022 at 14:45 • 0 comments

  It's been a while!

  The Timeline object detects audio recordings time coincidences and sync-merged  them  to corresponding videos:
  

  Next step: processing multi-files recordings (there are recognized in but not merged yet).

• This is getting serious

  Raymond Lutz • 03/10/2022 at 00:25 • 0 comments

  The project has it own domain name.
  

• Dedrifting

  Raymond Lutz • 02/19/2022 at 03:35 • 0 comments

  Before merging any audio to a video (or to a reference audio, called main sound), any track will be dedrifted using pysox tempo transform if the detected clock drifts result in a delay longer than 5 ms for sound tracks merged together or 10 ms for merged audio and video.
  

• Code rewrite

  Raymond Lutz • 02/03/2022 at 20:48 • 0 comments

  Pushing last updates to Source Hut

• Cabling

  Raymond Lutz • 01/22/2022 at 19:42 • 0 comments

  Using Adafruit Feather boards.

• It is now called the Tic Tac Sync!

  Raymond Lutz • 12/24/2021 at 23:05 • 0 comments

• Do you have any reference? I don't want to block any DC

  Raymond Lutz • 12/20/2021 at 13:04 • 0 comments

  The prototyping area of the Feather M0 is handy for building a voltage reference (aka virtual ground) around a LM358:

  I know there is a DC blocking capacitor built in the recorder audio input stage (or yet a DC-servo circuit to track the signal mean over time): I did feed the 0-3V3 directly into it (hence a signal with a 1.65V DC offset) but it resulted in ringing and more importantly in a lag of almost 500 μs ! I'll try the same measurements with an onboard cap to see if it makes any difference. I'll post data latter.
  

• Packaging crappy code

  Raymond Lutz • 11/07/2021 at 02:13 • 0 comments

  There's even a pypi package for my dualsoundsync script !

  Repositories are here:

  • for postprocessing: dualsoundsync on source hut
  • for flashing your own atomicsynchronator: ppssyncYears.ino

  
  How bad is my code?

  • It is not commented yet
  • test coverage is null, for now

  at least

  • it doesn't crash
  • it works (syncing dual system sound recordings)
  • it doesn't use print() for logging

  to do (software side, for dualsoundsync ):

  • comments and tests
  • optional logging
  • implement syncing of videos with intermittent audio recordings
  • implement syncing of audio with intermittent video recordings

  in the long run, build a standalone GUI program (with Qt?)
  

• Syncing in the kitchen

  Raymond Lutz • 10/14/2021 at 13:17 • 0 comments

  For now enjoy this dual-system sound demo. Stay tuned for a multicam demo with Olive and OpenTimelinIO

  ---

  
  

  Here is the camera recording: image + sync signal (fingers sound is absent, remember: this is a dual system sound set-up):

  This is the ZOOM H4n Pro recorder tracks. Note the thin spikes in the right channel (the yellow ovals): they are the sync pulses from the GPS, straight on the UTC second (the left channel are the fingers snipping). Those sync spikes are present in the movie too (by construction)
  

  Postprocessing with dualsoundsync.py, aligning the spikes in the audio recorder file with those in the camera file:
  

  $ dualsoundsync /media/shooting_files_rep
  
  scanning rushes_folder
  splitting audio from video...
  splitting audio R and L channels
  trying to decode YaLTC in audio files
  1 of 4: nope
  2 of 4: ZOOM_Rchan.wav started at 2021-10-13 01:45:08.263145+00:00
  3 of 4: nope
  4 of 4: fuji_a_Lchan.wav started at 2021-10-13 01:45:14.361967+00:00
  looking for time overlaps forming pairs...
  joining back synced audio to video: dualsoundsync/synced/fuji.mp4

  ---

  
  

  Tadaam, fuji.mp4 automagically synced!

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