[mythtv-users] mencoder and NBC 1080i

Boleslaw Ciesielski bolek-mythtv at curl.com
Sun Apr 1 18:29:40 UTC 2007


On 4/1/07, Mike Rosack <mrosack at sacknet.org> wrote:
>> I've been encoding all of my 1080i HD recordings to x264 (1-pass) for
>> a while now using the following command line:
>>
>> mencoder "$1" -oac copy -ovc x264 -vf pullup,softskip,scale=1280:720
>> -ofps 24000/1001 -x264encopts
>> bitrate=2250:subq=6:partitions=all:8x8dct:me=umh:frameref=5:bframes=3:b_pyramid:weight_b
>> -o "$2"
>>
>> This works great for most of my recordings, but for a small percentage
>> I get a constant stream of "1 duplicate frame(s)!" errors from
>> mencoder.  The resulting output looks pretty bad, extremely stuttery
>> and almost unwatchable.
>>
>> I'm not 100% sure, but I think that I've only ever seen this happen
>> with NBC shows, so maybe it has something to do with my local NBC
>> affiliate.  Has anyone else seen this happen?  Am I missing something
>> in my mencoder command line?

I think your problem is pullup and "-ofps 24000/1001" which only makes 
sense for shows that were originally recorded in 24fps. For others that 
are recorded in 1080i at 60Hz, it's probably best to leave them interlaced.

Bolek



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