Initial start offset problem

[jalexstark]

With current version (2013-07-26), I get

position=     -20     1599,    period=20
position=    1600     3199,    period=20
position=    3200     4799,    period=20
position=    4800     6399,    period=20
....

If I make a change to decoder.c

                if (d->frame_start_prev < 0) {
                        /* d->frame_start_off = posinfo - d->snd_to_biphase_period; */
                        d->frame_start_off = posinfo;
                } else {
                        d->frame_start_off = d->frame_start_prev;
                }

I get

position=       0     1599,    period=20
position=    1600     3199,    period=20
position=    3200     4799,    period=20
position=    4800     6399,    period=20
...

as expected.

I have no idea if this is a good idea.

[x42]

Check the phase of your LTC signal (and the initial audio-frames-per-videoframes 'apv' setting for ltc_decoder_create - although that seems OK).

the change was introduced in 68f6f3b in the wake of doing scope measurements with a BB timecode generator: https://gareus.org/wiki/a3extsync

[x42]

s/phase/polarity/