[FFmpeg-user] Generating v210 uncompressed AVIs from v210 individual files in 720p and 1080i formats

Tim Nicholson tim.nicholson at bbc.co.uk
Fri Sep 2 16:20:15 CEST 2011

On 02/09/11 15:07, Thomas Worth wrote:
> On Fri, Sep 2, 2011 at 6:50 AM, FrancoisMace<mace.francois at gmail.com>  wrote:
>> Hello Tim,
>> Thanks for your quick answer.
>> Indeed, my output image was specified as being 1920x540 since, when I
>> specified 1920x1080, one hald of the ouptut AVI displayed completely green.

Because you only supplied 540 lines of input...

>> So the command line was there in order to illustrate what I manage to get
>> working, although what is slipping out of your mind correspond to what I
>> have tried to get.
>> The only notions of "interlacing" I found in the ffmpeg documentation seem
>> to be related to the use of the AVC encoder/decoders which, since I am
>> wanting to do an uncompressed AVI, do not interest me.
> It sounds like you are trying to extract fields from an interlaced
> video and convert them to progressive (50i -->  50p). Am I correct? If

Thomas I think he has already extracted the individual fields and they 
now exist as discrete image files. Now he wants to turn them back into 
an interlaced video.

ISTR that mencoder managed that somewhat better than ffmpeg, but now 
ffmpeg supports mencoder filters it may be possible directly. I think 
having the input rate twice the output rate was involved somewhere.

Someone must remember.

However Francois is using a very old version of ffmpeg.

> so, I don't think it's as simple as scaling each field vertically to
> 1080 lines because you will get that jittery effect due to the fields
> being out of "registration." If I remember correctly, there is a bob
> filter in VirtualDub that will perform a shift to better align the
> fields and get rid of most of the jitter. That's a necessary step, and
> unless you do it prior to encoding with FFmpeg I don't think it'll
> look right.
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