[FFmpeg-user] Reading LTC from an audio track?

Harvey Pikelberger communque at gmail.com
Tue Nov 19 22:56:05 EET 2019

Thanks Jim,

> and you know it starts w tc of 07:00:00:00

So the challenge actually is we don’t know the start TC.  In fact that’s really all we need.

I’d like to verify the TC all tge way through too, but that’s for QC

The essential is just getting interpreting what TC on that (First fame) of the audio track.

> On Nov 19, 2019, at 12:47, Jim Shupert <jshupert at theppsgroup.com> wrote:
>> We're hoping there's something in the world of FFMpeg / FFProbe might be able to help here.
>>>>> On Nov 19, 2019, at 6:56 AM, Harvey Pikelberger <communque at gmail.com> wrote:
>>> Is there a command to tell FFMpeg to read LTC from a specific audio track?
> I do not know about that ....but
> would it help if you made a second file - now with Tc in it
> meaning
> you have a file
> dog.mp4 w ltc tc in audio  and you know it starts w tc of 07:00:00:00
> so do a
> ffmpeg -i dog.mp4 -codec copy -/timecode/ 07:00:00:00 dog_wtc.mp4
> MP4s and MOVs store only the TC of the first frame, as a literal frame count, along with the framerate. The consuming app converts that frame count back to a TC string using the framerate
> -timecode hh:mm:ssSEPff
>   Specify Timecode for writing. SEP is ’:’ for non drop timecode and
>   ’;’ (or ’.’) for drop.
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