[FFmpeg-user] How to see what mediainfo sees prores.mov

Andy Furniss adf.lists at gmail.com
Thu Feb 18 14:04:30 CET 2016

Moritz Barsnick wrote:
> Hi Andy,
> On Thu, Feb 18, 2016 at 12:07:44 +0000, Andy Furniss wrote:
>> Just idle messing around, wanted to make an interlaced prores just to
>> see how players/deinterlacers handled it.
> Disclaimer: I know very little about interlace stuff.
>> I know the command is "wrong" for colour etc - just a minimal test.
>> ffmpeg -f image2 -pattern_type glob -framerate 25 -i '02*.sgi' -vf setfield=tff -c:v prores  1080i25.mov
> There are two things:
> a) The encoder needs to support interlaced encoding.
> b) You need to tell it to do so using flags.
> a) From what I found using Google and the source code, only the encoder
>     prores_ks does support it. See
>     https://ffmpeg.org/pipermail/ffmpeg-devel/2012-August/129271.html
>     and search for AV_CODEC_FLAG_INTERLACED_DCT in libavcodec/.
>     The encoder "prores" you use is "prores_aw".
> b) The flags to add to the command line are "-flags +ildct", or even
>     "-flags +ilme+ildct". See also
>     https://ffmpeg.org/faq.html#Interlaced-video-looks-very-bad-when-encoded-with-ffmpeg_002c-what-is-wrong_003f

Thanks, TBH I should have known to try that (though it would be good if 
it were documented).

I temporarily stopped looking into that aspect after being distracted by 
the mediainfo "issue".

>> Scan type                                : Interlaced
>> Original scan type                       : Progressive
>> Scan type, store method                  : Interleaved fields
>> Scan order                               : Top Field First
> We don't know what mediainfo is looking at here. I may be wrong and
> mediainfo right. ;-)

I think you are right and will test later, but I still think I should 
know how to get
ffmpeg/ffprobe to show such fundamental info.

I guess this is in the container and it bugs me having to use mediainfo 
to see it.

I know mediainfo can probe more than ffmpeg in certain cases - but I 
consider interlaced/field order
to be quite fundamental and expected there to be a way to see it that I 
was missing.

More information about the ffmpeg-user mailing list