[FFmpeg-user] Need help; willing to pay

[Matthew Adams]

Don't forget that these videos were created by Coach's Eye
<https://www.coachseye.com/> for iOS.  I don't know anything about their
internals WRT recording videos.

On Tue, Jan 5, 2016 at 2:50 PM, Matthew Adams <matthew at matthewadams.me>
wrote:

> 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.
>
>
> https://www.dropbox.com/s/31civbxpe1utote/2016-01-02%2C%20Tour%20Warm%20Up.zip?dl=0
>
>
>
> 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
>> _______________________________________________
>> ffmpeg-user mailing list
>> ffmpeg-user at ffmpeg.org
>> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
>>
>
>
>
> --
> mailto:matthew at matthewadams.me <matthew at matthewadams.me>
> skype:matthewadams12
> googletalk:matthew at matthewadams.me
> http://matthewadams.me
> http://www.linkedin.com/in/matthewadams
>



-- 
mailto:matthew at matthewadams.me <matthew at matthewadams.me>
skype:matthewadams12
googletalk:matthew at matthewadams.me
http://matthewadams.me
http://www.linkedin.com/in/matthewadams