Re: [transcode-users] ffmpeg export mpeg2 interlaced

[Erik Slagter <erik@xxxxxxxxxxxxx>]

On Mon, 2004-09-06 at 16:21, Peter Chiocchetti wrote:
> now with a cvs build (!=development?)

cvs at exit1.org != development yeah.

> - my original question is answered fully :)
> ffmpeg reports setting the interlacedness
> to unknown. mpeginfo then diagnoses the resulting file to
> contain an interlaced video stream :)

Yes, when interlacing isn't set, it guesses that the source is
interlaced (which is almost always the case).

> things learned:
> - the buffer in ffmpeg svcd profile is set in bits not bytes
>   and about half as large as the spec says,

Can you test that with multiple players? If it really is, it should be
changed. If have this value from ffmpeg (the program).

> - ffmpeg will not set ilme to 1 automatically when encoding
>   interlaced footage, should it? I dont know,

The ffmpeg export sets ilme,ildct and interlacing=top/bottom when you
specify "dvd-pal", "dvd-ntsc" or "dvd-secam" profile, unless you
override these values.

> - the profile does not consider high bitrate audio: simply
>   lowering video max rate by 200 in ffmpeg.cfg helped let
>   mplex do its part.

AFAIK the bitrate in the ffmpeg.cfg is completely ignored.

The rate control of ffmpeg probably ignores the audio bitrate, so you
have to take that in account.

> apropos b-frames: the svcd profile would not do them, acc. to
> http://lea.hamradio.si/~s51kq/V-SVCD-S.HTM svcd players are to
> support them; this person testifies for b-frames in svcd being
> valid too http://www.geocities.com/aussie01au/SVCD.html - I
> have yet to test myself.

The use of b-frames is completely independent of export profiles. You
can use them or not, based upon the setting in ffmpeg.cfg. Default is
none.

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