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2nd June 2013, 09:42 | #1 | Link |
AVStoDVD Dev
Join Date: Apr 2006
Location: Italy
Posts: 1,302
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FFmpeg and interlaced encoding
Using FFmpeg to produce an interlaced mpeg2 output, from an interlaced source (i.e. DV), I have a doubt regarding the flags to use.
-ilme -top 1 does produce a valid interlaced output TFF, according to MediaInfo. From FFmpeg online documentation, 'ildct' and 'alt' parameters can be used as well: -flags +ilme+ildct+alt -top 1 The question is: in your experience, are 'ildct' and 'alt' really needed to produce a good quality interlaced output? Bye |
3rd June 2013, 14:50 | #2 | Link |
Registered User
Join Date: Aug 2008
Location: Isle of Man
Posts: 588
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In my experience ilme & ildct suffice. The page you link to is the FAQ; from the reference documentation:
Code:
‘flags flags (decoding/encoding,audio,video,subtitles)’ Set generic flags. Possible values: ... ‘ildct’ Use interlaced DCT. ... ‘ilme’ Apply interlaced motion estimation. ... I have no knowledge of alt and I don't see it listed in the documentation either. Perhaps it's been deprecated and its mention in the FAQ is a left-over? PS. As I understand it, all DV sources are BFF? E.g. http://www.dvmp.co.uk/digital-video.htm, last paragraph in 'DV & DVCAM'. For my DV camera I use '-top 0'. PPS. I also found a DV clip that MediaInfo (incorrectly) reports as TFF. To determine correct field order, use Code:
AssumeTFF() SeparateFields() Cheers, Francois Last edited by fvisagie; 3rd June 2013 at 15:24. Reason: PPS |
4th June 2013, 21:45 | #3 | Link |
AVStoDVD Dev
Join Date: Apr 2006
Location: Italy
Posts: 1,302
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@fvisagie
thanks for the very useful inputs. The origin of the question can be found here. 'alt' is now deprecated and substitued by 'alternate_scan 1' even if it is not mentioned in the official documentation. Bye |
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