Interesting article: "Time-coding audio files" http://www.windytan.com/2014/06/time-coding-audio-files.html
The author is a signals hacker who has spoken at CCC and other events, and has determined that "There's no standard method for doing this with WAV or FLAC files". Where "this" means recording the UTC time-of-day in the audio stream, as ongoing data, as opposed to knowing the start time and elapsed time. When recording radio stations (for logging purposes) or environmental noise (which may include long periods of silence that don't get logged) and telephone call speech (for "training purposes") it is often more practical to have a constant timecode at playback that corresponds to the "wall clock" UTC at time of recording. The article proposes 2 methods (with working Perl code) to embed the time as in-band noise in the audio. One method (LSB stealing) requires lossless encoding; the other is audible but can survive lossy encoding. I'm sure that BWF supports timecode (SMPTE or compatible) as out-of-band data, and I assumed that FLAC also had some support for this. Was I wrong? -- -Dec. --- (no microsoft products were used to create this message) _______________________________________________ flac-dev mailing list flac-dev@xiph.org http://lists.xiph.org/mailman/listinfo/flac-dev