[FFmpeg-user] converting 1080p50 to PAL interlaced dv format

[Boštjan Strojan]

p.s. can't reach the sample.

b.

2012/1/25 Boštjan Strojan <bostjan.strojan at gmail.com>:
> i assumed your hd input is 1080i50, will check the sample now.
>
> b.
>
> On Wed, Jan 25, 2012 at 1:42 AM, Konrad Karl <kk_konrad at gmx.at> wrote:
>> Hi,
>>
>> On Tue, Jan 24, 2012 at 08:01:51PM +0100, Bo??tjan Strojan wrote:
>>> I don't have a command line ready, but the filter order might be:
>>>
>>> 1. crop width
>>> 2. resize width to final size
>>> 3. bob deinterlace (maybe yadif) to get double frame rate
>>
>> this I don't understand: why would I need double frame rate?
>>
>> 1080p50 is already 50 full frames per second and the output should
>> be interlaced to have 25 full frames per second using two fields,
>> lower field first.
>>
>> from http://www.dvmp.co.uk/digital-video.htm (DV & DVCAM)
>>
>> "Consequently in both systems field 1 is the "lower" field .
>> Field 1 dominance effectively means that the field order of DV material
>> is "lower field first" for both PAL and NTSC, which is nice! "
>>
>> So after steps 1 and 2 above the video already has correct size with
>> 50 full frames per second and now interlacing should produce two frames
>> of 1/50 second duration each (assuming  non-interlaced lines are numbered 1..576):
>>
>> lower  frame: taking lines 2,4,6....576  from the first  50p frame
>> higher frame: lines 1,3,4....575         from the second 50p frame
>> and so on.
>>
>> I think the DV pixels are not quadratic (dont know for sure yet) then this should
>> be taken into account during step 1 and 2.
>>
>> Does this make sense so far?
>>
>>> 4. resize height to final/2
>>> 5. reinterlace (maybe using tinterlace)
>>
>> Thanks for mentioning tinterlace, did not know about it.
>>
>>> or maybe just
>>>
>>> 1. crop width
>>> 2. crop height (keeping in mind line scan order)
>>> 3. resize (use interl=1 with scale command)
>>>
>>> can you upload a short sample (the one that has a lot of motion)?
>>
>> I have put a very short example 1080p50 video here:
>>
>> http://140.78.117.254:88/avchd/out.mts.bin
>> (~ 3.5MB)
>>
>> it has been extracted from a longer clip:
>>
>> ffmpeg -i 00023.MTS -ss 00:00:03.5 -t 00:00:01.500 -acodec copy -vcodec copy -f mpegts out.mts
>>
>> since I was unable to get a short enough clip by using the record button :-)
>>
>> will experiment using your suggestions tomorrow which forces me to read
>> the man page a couple of times I think. A command line example about
>> using "resize (use interl=1 with scale command)" and/or "(maybe using
>> tinterlace)" will let me reach my goal a lot faster, I guess.
>>
>> Many thanks,
>>
>> Konrad
>>
>>> b.
>>>
>>> On Tue, Jan 24, 2012 at 6:47 PM, Konrad Karl <kk_konrad at gmx.at> wrote:
>>> > Dear all,
>>> >
>>> > is this possible with current ffmpeg (Fedora 16, but I can compile myself)?
>>> > Google did not help so far, "interlaced" triggers lots of search results
>>> > about de-interlacing....
>>> _______________________________________________
>>> ffmpeg-user mailing list
>>> ffmpeg-user at ffmpeg.org
>>> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
>> _______________________________________________
>> ffmpeg-user mailing list
>> ffmpeg-user at ffmpeg.org
>> http://ffmpeg.org/mailman/listinfo/ffmpeg-user