[FFmpeg-user] Syncing clips based on audio waveform?

[Pavel Koshevoy]

On 3/1/2013 3:17 PM, Pavel Koshevoy wrote:
> On 3/1/2013 9:38 AM, Arthur Wait wrote:
>> Hi all,
>>
>> This is coming from out of left field I imagine, but I'm wondering if
>> anyone knows of a filter (or chain of filters) which would allow me to
>> align/sync two video clips based on matches in their audio waveforms.
>>
>> I'm shooting events with multiple cameras and would like to either 
>> trim the
>> clips to a precise, matching starting frame or generate a metadata 
>> "offset"
>> marker indicating how far off one clip is from the other in time. Then I
>> can trim the clips to match.
>>
>> Is this possible in ffmpeg (or anywhere else for that matter!)?
>
>
> I don't know if there is anything in ffmpeg that would accomplish what 
> you need right now, and I doubt implementing it as a filter is very 
> practical.  It could be implemented as a separate utility -- give it a 
> reference file and another file and it spits out time offset of the 
> second file relative to the reference file (if it can find a 
> correlation).

Now that I think about it, this feature probably should be implemented 
in ffprobe.

     Pavel