[FFmpeg-user] Need help; willing to pay

Matthew Adams matthew at matthewadams.me
Tue Jan 5 21:50:08 CET 2016

Here is a link to zipped copies of originals placed on my dropbox account.
I zipped them in order to reduce the likelihood that they're changed by the
file hosting service.


On Tue, Jan 5, 2016 at 2:08 PM, Moritz Barsnick <barsnick at gmx.net> wrote:

> On Tue, Jan 05, 2016 at 13:30:07 -0600, Matthew Adams wrote:
> > I pulled the files off of the iPhone using iExplorer, a nice little tool
> to
> > get at the iOS filesystem.
> Hmm. Something tells me this isn't the raw video as it comes from your
> device, but it was manipulated by Google (Drive) after your upload:
> $ sha1sum variable-bitrate-sample.mov
> 3820bb93784835f2257299008fed2fafeaacd5c5  variable-bitrate-sample.mov
> $ ffmpeg -i variable-bitrate-sample.mov
> ffmpeg version 2.6.5 Copyright (c) 2000-2015 the FFmpeg developers
> [...]
>     Metadata:
>       creation_time   : 2016-01-03 05:53:31
>       handler_name    : IsoMedia File Produced by Google, 5-11-2011
> I don't think any Apple product inserts such metadata. ;-)
> Googl(ouch!)ing a bit, it does seem iOS creates variable frame rate
> videos. But usually, they are detected as such, or in other words, the
> headers and timestamps properly reflect that.
> So I think Google Drive ruined your video by doing some bad CFR magic
> to it.
> The video as *I* get it from your Google drive is not fixable without
> manual analysis of the timeline. Likely the original video which is (or
> has remained) on your iPhone is different. If it doesn't play fine
> there either, the video recording software fooled you, or did this
> effect on purpose due to some configuration. If it does play correctly
> on the iPhone though, you may need to find a different way to get that
> file to us. You probably wouldn't even need to fix it if Google Drive
> (your way to share the videos with others?) didn't mess it up.
> ffmpeg *can* convert VFR to CFR if need be (for the sake of players
> which can't handle the former).
> Moritz
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