[FFmpeg-user] IMX50 NTSC framesize differs to the SMPTE 356M-2001 Standard - why?

[Christoph Gerstbauer]

Am 15.06.2015 um 14:02 schrieb tim nicholson:
> On 15/06/15 09:39, Christoph Gerstbauer wrote:
>>>> 1.) Please can you tell me YOUR used syntaxes for IMX30/40/50  for PAL
>>>> and NTSC? I want to compare it to mine.
>>> Mine look remarkably similar to yours except for the ommission of 'ilme'
>>> which makes no sense for an I frame only format.
>> Maybe the ffmpeg documentation is not correct?
>> "ILME: Force interlacing support in encoder (MPEG-2 and MPEG-4 only).
>> Use this option if your input file is interlaced and you want to keep
>> the interlaced format for minimum losses. The alternative is to
>> deinterlace the input stream with-deinterlace, but deinterlacing
>> introduces losses."
>>
>>     Our IMX50 source will be always interlaced. But what does ILME have
>>     to to with Intra frame encoding (I-frame)? Does ILME only works for
> Hmmm. the docs describe 'ilme' twice; in Section 11 (Codec Options) it
> simply states:-
>
> ‘ilme’   Apply interlaced motion estimation.
>
> For an I frame only format motion estimation is not applicable. So I
> would say that ilme has nothing to do with Intra frame encoding.
>>     GOP structures in MPEG2 and MPEG4? If yes, this should be explained
>>     in the documentation, I think. But it isnt.
>>
> Unless the flag performs some other undocumented fuction as well it
> ought to be redundant.
>

Hm do you know who implemented ilme?
Otherwise, what do you think? is it better to delete it from the syntax 
or not?

Best Regards
Christoph