Declan Kelly wrote: > 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".
There doesn't need to be. Both FLAC and WAV are limited to a single sample rate for the whole recording. Therefore, all that is required is a single indicating the UTC timestamp the recording was begun. Broadcast WAV does indeed have a recording timestamp and there is For FLAC the that timestamp can be trasnferred from the WAV file using the --keep-foreign-metadata option. > 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. Nice proof of concept, but i feel pretty useless in practice. Erik -- ---------------------------------------------------------------------- Erik de Castro Lopo http://www.mega-nerd.com/ _______________________________________________ flac-dev mailing list flac-dev@xiph.org http://lists.xiph.org/mailman/listinfo/flac-dev
