[FFmpeg-user] How to see what mediainfo sees prores.mov
dave at dericed.com
Thu Feb 18 18:22:23 CET 2016
> On Feb 18, 2016, at 8:04 AM, Andy Furniss <adf.lists at gmail.com> wrote:
> 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
>> 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
> 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.
I'm guessing here, but I suspect that MediaInfo may be reporting interlacement information based upon the 'fiel' atom in the QuickTime container. AFAIK ffmpeg reports on interlacement settings from streams but not from the format.
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