[FFmpeg-user] field order detection - numbering framepositions possible?

Paul B Mahol onemda at gmail.com
Tue Feb 9 15:59:42 CET 2016

On 2/9/16, Christoph Gerstbauer <christophgerstbauer at gmail.com> wrote:
> Hello Moritz,
> I dont want to extract the Metadata from each frame.
> I want to analyse the video itself, not its metadata.
> In some cases the metadata will not fit to the essence picture.
> And for these cases I want to analyse the essence, and print out a
> "report" on which timeposition a frame has different field order to the
> wanted one.

idet filter does analyse the video itself and sets frame metadata to what
it thinks frame actually is.

So could you provide more info what you want.
What is wanted order and where one can specify it.
How you gonna check what is actual frame order, and so on.

> Best Regards
> Christoph
> Am 26.01.2016 um 13:06 schrieb Moritz Barsnick:
>> Hi Christoph,
>> On Tue, Jan 26, 2016 at 11:36:54 +0100, Christoph Gerstbauer wrote:
>>> Is it possible to MARK the framenumbers to its detected field orders?
>>> Via framenumber or timestamp?
>>> Or to search a "known" TFF content for BFF frames? To force the output
>>> to lines like:
>>> Found BFF frames at position X
>> I don't think ffmpeg provides the desired statistics, but you could
>> extract them yourself.
>> The idet filter inserts metadata into each frame as documented here:
>> https://ffmpeg.org/ffmpeg-filters.html#idet
>> You can use ffprobe to show and analyze the metadata and parse your own
>> conclusions:
>> $ ffprobe -f lavfi -i "movie=infile.avi,idet" -show_frames
>> and use ffprobe arguments to show only the interesting fields (frame
>> number, tff/bff, statistics) for the desired streams.
>> Thinking about it, those "cumulative" values may even be the indicators
>> you are looking for. (Not sure.)
>> Cheers,
>> Moritz
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