[FFmpeg-user] [EXTERNAL] Re: QuickTime Movie Header Atom Poster Time

Bryce Newman bryce.newman at gettyimages.com
Tue Apr 20 20:09:07 EEST 2021


Hi Gyan,
Thank you!
Can this patch be included in future stable versions of ffprobe?

On 4/20/21, 10:57 AM, "ffmpeg-user on behalf of Gyan Doshi" <ffmpeg-user-bounces at ffmpeg.org on behalf of ffmpeg at gyani.pro> wrote:



    On 2021-04-20 21:52, Bryce Newman wrote:
    > Hi,
    >
    > Using the latest ffprobe version 4.4 I am trying to print the poster time from the mvhd. Here is the data structure https://developer.apple.com/library/archive/documentation/QuickTime/QTFF/QTFFChap2/qtff2.html#//apple_ref/doc/uid/TP40000939-CH204-32947.
    >
    > As I see from the code in https://github.com/FFmpeg/FFmpeg/blob/f40e9b13554d88cbdd6cd2b4a3da2cbea9590f5d/libavformat/mov.c#L1524 poster time is there, but I am not sure of the ffprobe args that will log poster time, current time etc to stdout.
    >
    > I should note that exiftool does log to stdout the poster time.
    > i.e.
    >
    > exiftool POSTERFRAME_YES_995968260_h1.mov | grep Poster
    > Poster Time                     : 7.32 s
    >
    > How can I have ffprobe also print out the poster time or all the values in the mvhd?

    Nothing is done with that data - it's not exported.

    I'll send a patch to write many of those fields out as metadata, but I 
    expect that to take some time as many regression unit tests will have to 
    be changed.

    Regards,
    Gyan
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Bryce Chester Newman | Principal Developer
 
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