[MEncoder-users] Encoding interlaced content: what am I doing wrong?

[Martijn van Beurden]

Because I try to keep as much quality as I can get, and as x264 is far 
superior to MPEG2, I capture to x264. Then I write an EDL file to cut 
out snow and bad scenes and the like, and then convert it to MPEG-2 in 2 
passes. x264 had something called constant rate factor which encodes 
based on scene complexity instead of just targeting a bitrate.

So, first encode to x264, then to MPEG-2 in slower-then-realtime and 2 
passes.

James Hastings-Trew schreef:
> Martijn van Beurden wrote:
>> Good afternoon,
>>
>> Currently I'm busy transcoding Hi8 video to DVDs. I've already done 2
>> tapes, using pp=fd as deinterlacer, but very recently I discovered what
>> interlacing is exactly, and I'm convinced I should try keep the
>> interlacing, so I'm adjusting my toolchain.
>>
>> First I capture the video with mencoder piped to x264 (just for --preset
>> and --tune setting convenience) and arecord to capture sound in 24-bit
>> format, then amplify it, turn it to 16-bit and merge it into a .mkv
>> file. So far so good, this is quite easy to keep interlaced, just pass
>> --interlaced to x264.
>>
>> I'm looking which settings to use to encode interlaced material, but
>> some of my tests seem to fail. I used this command to generate a file
>> test.mpg
>> mencoder -edl tape3.edl -hr-edl-seek tape3.mkv -vf
>> crop=686:560:16:4,scale,expand=720:576:16:0 -nosound -ovc lavc -lavcopts
>> vcodec=mpeg2video:vrc_buf_size=1835:vrc_maxrate=9800:turbo:vpass=1:ilme:ildct:vstrict=0:threads=2:vbitrate=5800:keyint=15 
>>
>> -of mpeg -mpegopts format=dvd:tsaf -o test.mpg
>>
>> So, as you can see, I'm messing around getting the first pass right.
>> (Second pass shouldn't be a problem) The resulting video is clearly
>> interlaced, it works when played with mplayer with -vf pp=fd, but when
>> using -vf tfields=0:0,scale the framerate doesn't double (or, when
>> played at 0.25x, motion isn't that smooth) while it does when I try at
>> tape3.mkv, the original capture. What am I doing wrong? I suspect
>> there's something wrong with the container, the video not being marked
>> as deinterlaced or something...? Or is my test method wrong and is this
>> encode fine?
> I'm a little confused as to why your material is in an .mkv container 
> to begin with. Why wouldn't you directly capture the Hi8 video into an 
> MPEG2 file?
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