[mythtv-users] Aspect ratio

Rich West Rich.West at wesmo.com
Mon Apr 2 15:47:55 UTC 2007

I'm having trouble getting this 'right', and was hoping that someone
might be able to point me in the right direction...

On one of our mythtv boxes (I have not tested against the other), the
internal MythTV video player tends to hiccup or skip when playing the
video off of the network drives (this has become more apparent with the
later fixes releases from atrpms) almost as if it were having buffering
problems (others on the list have reported "me too" type of problems). 
So, I thought I would try out using another player when displaying a DVD
Video (ISO), like mplayer and xine, to see if I could make it 'just work'.

I picked a real 16:9 aspect movie (one that identified itself as 1.78:1,
which works out to be 16:9) and tested with that.  But, oddly, I hit
another issue... the aspect display didn't seem right.  In this
instance, the picture should happily fill the screen with no black bars
at the top and bottom of the screen, but I'm seeing a heavily
letterbox'ed image with large bars at the top and bottom of the screen.

Interestingly enough, mplayer was the first one to give me an indication
that, perhaps, I have something set wrong within X.  Now, I am no
mplayer guru, but could this an indication of a missing mplayer option
or an incorrect X setup for DVD playback?

I checked the wiki and Jarod's "Tips-n-Tricks" page and tried various
options according to those (and other) pages, but I get the feeling like
I am missing something here (this command below is from Jarod's page,
the wiki gave an image with much bigger black bars).


> [mythtv at mythtv2 ~]$ /usr/bin/mplayer -fs -vo xv
> /home/video/Kids/Sky_High.iso
> MPlayer dev-SVN-rUNKNOWN-3.2.3 (C) 2000-2006 MPlayer Team
> CPU: AMD Sempron(tm) Processor 3000+ (Family: 15, Model: 44, Stepping: 2)
> CPUflags:  MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 1
> Compiled with runtime CPU detection.
> Can't open joystick device /dev/input/js0: No such file or directory
> Can't init input joystick
> Playing /home/video/Kids/Sky_High.iso.
> MPEG-PS file format detected.
> VIDEO:  MPEG2  720x480  (aspect 3)  29.970 fps  9800.0 kbps (1225.0
> kbyte/s)
> ==========================================================================
> Opening video decoder: [mpegpes] MPEG 1/2 Video passthrough
> VDec: vo config request - 720 x 480 (preferred colorspace: Mpeg PES)
> Could not find matching colorspace - retrying with -vf scale...
> Opening video filter: [scale]
> The selected video_out device is incompatible with this codec.
> Try adding the scale filter, e.g. -vf spp,scale instead of -vf spp.
> VDecoder init failed :(
> Opening video decoder: [libmpeg2] MPEG 1/2 Video decoder libmpeg2-v0.4.0b
> Selected video codec: [mpeg12] vfm: libmpeg2 (MPEG-1 or 2 (libmpeg2))
> ==========================================================================
> ==========================================================================
> Opening audio decoder: [liba52] AC3 decoding with liba52
> Using SSE optimized IMDCT transform
> Using MMX optimized resampler
> AUDIO: 48000 Hz, 2 ch, s16le, 448.0 kbit/29.17% (ratio: 56000->192000)
> Selected audio codec: [a52] afm: liba52 (AC3-liba52)
> ==========================================================================
> AO: [alsa] 48000Hz 2ch s16le (2 bytes per sample)
> Starting playback...
> VDec: vo config request - 720 x 480 (preferred colorspace: Planar YV12)
> VDec: using Planar YV12 as output csp (no 0)
> Movie-Aspect is 1.78:1 - prescaling to correct movie aspect.
> VO: [xv] 720x480 => 854x480 Planar YV12  [fs]
> [ASPECT] Warning: No suitable new res found!
> [ASPECT] Warning: No suitable new res found!
> [ASPECT] Warning: No suitable new res found!
> [ASPECT] Warning: No suitable new res found!
> [ASPECT] Warning: No suitable new res found!
> [ASPECT] Warning: No suitable new res found!
> A:   0.7 V:   0.6 A-V:  0.024 ct:  0.020  12/ 10 ??% ??% ??,?% 1 0
> demux_mpg: 24000/1001fps progressive NTSC content detected, switching
> framerate.A:   2.4 V:   2.4 A-V:  0.018 ct:  0.072  55/ 52 11%  0% 
> 1.7% 1 0
> Exiting... (Quit)

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