[MEncoder-users] Encoded DVD video has motion flicker

[Chris Capon]

Hi all.

I am using mencoder to process digital TV recordings, converting them to 
DVD.  The source is an HVR-1600 recording ATSC video using an 
over-the-air antenna.

When playing the encoded video on a DVD player, scenes with horizontal 
or vertical motion seem to hop, flicker or jump as they play rather than 
flowing smoothly.  I'm guessing the images are jumping a block at a 
time, so maybe around 16 pixels.


Below is a dump of my command line along with the first few seconds of 
mencoder's output.  I'm using the current SVN version of mencoder.

If someone has some ideas of options I could try I'd appreciate it.

Here is a list of LAVC options I've tried which DO NOT seem to affect 
the problem:

    mbd=1  vb_strategy=1  mpeg_quant  gmc  lowdelay  trell
    mbd=2  ilme  ildct  dc=10  dia=-10  predia=-10  precmp=2
    subcmp=2  cmp=2  cbp  mv0  vqmin=1  lmin=1


I'm also having some audio sync issues but have been addressing them 
using the -delay option.


Much thanks,
Chris.


./mplayer/mencoder "recording.mpg" -oac lavc -ovc lavc -of mpeg
  -mpegopts format=dvd:tsaf -vf pp,scale=presize=ntsc,dsize=16/9,harddup
  -srate 48000 -delay 0.2 -af lavcresample=48000 -lavcopts
  vcodec=mpeg2video:vrc_buf_size=1835:vrc_maxrate=9800:vstrict=0
:keyint=15:vbitrate=5000:aspect=16/9:acodec=ac3:abitrate=384
  -ofps 30000/1001 -o "encoded.mpg"


MEncoder SVN-r29796-4.3.4 (C) 2000-2009 MPlayer Team
success: format: 0  data: 0x0 - 0xe3639000
TS file format detected.
VIDEO MPEG2(pid=65) AUDIO A52(pid=68) NO SUBS (yet)!  PROGRAM N. 4
VIDEO:  MPEG2  1920x1080  (aspect 3)  29.970 fps  17500.0 kbps (2187.5 
kbyte/s)
[V] filefmt:29  fourcc:0x10000002  size:1920x1080  fps:29.970  ftime:=0.0334
==========================================================================
Opening audio decoder: [liba52] AC3 decoding with liba52
Using SSE optimized IMDCT transform
Using MMX optimized resampler
AUDIO: 48000 Hz, 2 ch, s16le, 384.0 kbit/25.00% (ratio: 48000->192000)
Selected audio codec: [a52] afm: liba52 (AC3-liba52)
==========================================================================
PACKET SIZE: 2048 bytes, deltascr: 43885
Opening video filter: [expand osd=1]
Expand: -1 x -1, -1 ; -1, osd: 1, aspect: 0.000000, round: 0
Opening video filter: [harddup]
Opening video filter: [dsize=16/9]
Opening video filter: [scale presize=ntsc]
Opening video filter: [pp]
==========================================================================
Opening video decoder: [mpegpes] MPEG 1/2 Video passthrough
[PP] Using external postprocessing filter, max q = 6.
Could not find matching colorspace - retrying with -vf scale...
Opening video filter: [scale]
The selected video_out device is incompatible with this codec.
Try appending the scale filter to your filter list,
e.g. -vf spp,scale instead of -vf spp.
VDecoder init failed :(
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Unsupported PixelFormat -1
Selected video codec: [ffmpeg2] vfm: ffmpeg (FFmpeg MPEG-2)
==========================================================================
[ac3 @ 0x2d75370]No channel layout specified. The encoder will guess the 
layout, but it might be incorrect.
Limiting audio preload to 0.4s.
Increasing audio density to 4.
[PP] Using external postprocessing filter, max q = 6.
Movie-Aspect is 1.78:1 - prescaling to correct movie aspect.
[swscaler @ 0x2f380b0]BICUBIC scaler, from yuv420p to yuv420p using MMX2
videocodec: libavcodec (720x480 fourcc=3267706d [mpg2])
Pos:   0.0s      1f ( 0%)  0.00fps Trem:   0min   0mb  A-V:0.000 [0:0]
1 duplicate frame(s)!
Writing header...
INITV: 0.200, 0.167, fps: 29.970
Pos:   0.0s      2f ( 0%)  0.00fps Trem:   0min   0mb  A-V:-0.003 [0:0]
1 duplicate frame(s)!
INITV: 0.233, 0.200, fps: 29.970
Pos:   0.1s      3f ( 0%)  0.00fps Trem:   0min   0mb  A-V:-0.007 [0:0]
INITV: 0.267, 0.233, fps: 29.970

1 duplicate frame(s)!
Pos:   0.1s      4f ( 0%)  0.00fps Trem:   0min   0mb  A-V:-0.010 [0:0]
Pos:   0.2s      5f ( 0%)  0.00fps Trem:   0min   0mb  A-V:-0.013 [0:0]
Pos:   0.2s      6f ( 0%)  0.00fps Trem:   0min   0mb  A-V:-0.017 [0:0]
Pos:   0.2s      7f ( 0%)  0.00fps Trem:   0min   0mb  A-V:-0.020 [0:0]
Pos:   0.3s      8f ( 0%)  0.00fps Trem:   0min   0mb  A-V:-0.023 [0:0]
Pos:   0.3s      9f ( 0%)  0.00fps Trem:   0min   0mb  A-V:-0.027 [0:0]
Pos:   0.3s     10f ( 0%)  0.00fps Trem:   0min   0mb  A-V:-0.030 [0:0]
...(output trimmed)...
Pos:  41.3s   1229f ( 0%) 46.86fps Trem: 131min 7878mb  A-V:-0.028 
[4823:384]
Pos:  41.4s   1230f ( 0%) 46.86fps Trem: 131min 7878mb  A-V:-0.028 
[4820:384]
Pos:  41.4s   1231f ( 0%) 46.86fps Trem: 131min 7878mb  A-V:-0.027 
[4818:384]
Pos:  41.4s   1232f ( 0%) 46.87fps Trem: 130min 7854mb  A-V:-0.025 
[4815:384]
Pos:  41.5s   1233f ( 0%) 46.87fps Trem: 131min 7854mb  A-V:-0.024 
[4812:384]
Pos:  41.5s   1234f ( 0%) 46.87fps Trem: 131min 7854mb  A-V:-0.023 
[4810:384]
...(ctrl-c)...
Flushing video frames.
Writing index...

Overhead: 2.179% (586807 / 26930121)
Writing header...

Video stream: 4810.329 kbit/s  (601291 B/s)  size: 24958473 bytes 
41.508 secs  1234 frames

Audio stream:  384.000 kbit/s  (48000 B/s)  size: 2010624 bytes  41.888 secs