[MEncoder-users] Audio sync problems with HDV footage while performing an inverse telecine

[Eric Wescott]

On 06/07/2010 06:48 AM, James Hastings-Trew wrote:
> Eric Wescott wrote:
>> On 5/4/10 4:41 PM, Alexander Strange wrote:
>>> On May 4, 2010, at 3:44 PM, Eric Wescott wrote:
>>>
>>>> Using "filmdint=io=30:24/fast=0,softskip,harddup,scale=1920:1080 
>>>> -noskip"? produces some strange color artifacts on the top 50 or so 
>>>> lines of pixels. You can see the detail but it's like there are 
>>>> sections where a green/purple filter is put over it. It's not 
>>>> constant and flickers and seems random where these filters are placed.
>>>>
>>>> What exactly is the different between filmdint and pullup?
>>>> I had a similar problem when using vcodec=huffyuv instead of 
>>>> vcodec=ffvhuff. Using huffyuv would produce a similar problem on 
>>>> random clips but on the bottom of the frame. It however lost the 
>>>> entire detail and just looked almost like a visualization of the 
>>>> audio but didn't actually correspond to the audio playing.
>>>>
>>>> Anyway, I seem to have found the solution by removing the -mc 0 
>>>> section and sticking with ffvhuff.
>>>>
>>>>
>>>> Maybe one more thing to note.. After I get the 24p huffyuv version 
>>>> I'm transcoding it in Final Cut Studio's Compressor application to 
>>>> ProRes 422 and ProRes 422 Proxy. Some files aren't recognized by 
>>>> Compressor (I suspect it's a bug in Perian) and I can detect this 
>>>> by finder not showing a thumbnail preview for this file.
>>> Do you have a sample or reliable way to create one for this?
>> Yes, you can access the file via this link. It's an 80meg HDV file.
>> https://pantherfile.uwm.edu/wescott/mencoder/Tape004-0045.m2t
>>
>> Here are the three methods I've used to encode the file
>> mencoder Tape004-0045.m2t -fps 30000/1001 -vf 
>> pullup,softskip,harddup,scale=1920:1080 -ofps 24000/1001 -ovc x264 
>> -x264encopts qp=0 -demuxer lavf -oac pcm -o Tape004-0045.h264.avi
>> mencoder Tape004-0045.m2t  -fps 30000/1001 -vf 
>> pullup,softskip,harddup,scale=1920:1080 -ofps 24000/1001 -ovc lavc 
>> -lavcopts vcodec=ffvhuff:aspect=16/9 -demuxer lavf -oac pcm -o 
>> Tape004-0045.ffvhuff.avi
>> mencoder Tape004-0045.m2t  -fps 30000/1001 -vf 
>> pullup,softskip,harddup,scale=1920:1080 -ofps 24000/1001 -ovc lavc 
>> -lavcopts vcodec=huffyuv:pred=2:format=422P:vstrict=-1 -demuxer lavf 
>> -oac pcm -o Tape004-0045.huffyuv.avi
> This might or might not have anything to do with your problem, but 
> 1080 is not divisible by 16. Make sure you use dimensions that are 
> divisible by 16 either by scaling, cropping, or expanding the video 
> picture. You could crop to 1072, or expand to 1088. That might make 
> the difference to the green and purple artifacts showing up in the 
> huffyuv stream.
>
No dice. Same artifacts.. It's a pretty intermittent problem as it only 
effects maybe 100 out of ~5000 clips I encoded. The problem with them 
reading in Quicktime (via Perian) is even lower.. I'd say maybe 20 out 
of ~5000 clips don't play in Quicktime..

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