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

[Paul B Mahol]

On 3/2/13, Dave Rice <dave at dericed.com> wrote:
>
> On Mar 1, 2013, at 6:00 PM, Pavel Koshevoy <pkoshevoy at gmail.com> wrote:
>
>> 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.
>
> +1 for that.

Nonsense...

> Dave Rice
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