[FFmpeg-user] Confusion about fieldmatch, decimate and framerate (now with yadif)

[L. Lee]

On 12/8/13, 8:24 AM, "Nicholas Robbins" <nickrobbins at yahoo.com> wrote:
>
>> On Sunday, December 8, 2013 3:43 AM, L. Lee <llee040 at sbcglobal.net>
>>wrote:
>> > I didn¹t access your video, please tell me how. In the meantime, I
>>used
>> your process to rip a DVD so I could try some things. I couldn¹t use
>>.mkv
>> as the name extension of the source file, but once I changed it to
>>.mpg, I
>> could use the following. The output is OK from beginning to end even
>>when
>> I performed it on the full 90-minute title. Mine was an old 4X3 source.
>
>I don't know how you can get access to incoming, but thanks for the shot.
>My method works for most dvds, this one source is the exception rather
>than the rule.
>
>> 
>> ffmpeg -y -i Œdd-vob-short.mpg' -map 0:0 -map 0:1 -vf
>> "fieldmatch=order=tff:combmatch=none,fps=fps=24000/1001" -pix_fmt
>> yuv420p
>> -c:v libx264 -preset slower -tune film -crf 18 -x264opts
>> keyint=40:bitrate=2100:qpmin=8:qpmax=38:qpstep=4 -c:a:0 libfaac -b:a:0
>> 256k 'dd-vob-short.detelecine.m4v'
>> 
>
>
>IIUC, combmatch=none will label no frames as interlaced. So you wouldn't
>get any errors like I am getting no matter what. I added that option to
>my command and it didn't complain anymore, but it did still produce
>interlaced frames.
>
>I tried changing the extension to mpg and I had the same output as
>before. I had assumed ffmpeg was smarter than that.
>

I don’t think the command will be of any use whatsoever without the
conversion to 24 fps (fps=fps=24000/1001). No interlaced frames remain
when you use that, do they?

Laine