[mythtv-users] Is this beefy machine really not enough to drive HD at 1080p?

[Scott Harris]

> The machine has more than enough power to play back 1080p video. What is 
> your video source? Out of sync does not sound like a hardware problem. 
> Sounds like a config issue.
> 

Video source is an mkv file.  I'm going DVI out from the video card
to HDMI into the receiver.  For audio I'm using SPDIF optical cable.
The file in question is a is a BluRay rip at 1080p with AC3 and x264.
A similar file, at 720p, with DTS, or one with AC3, can play flawlessly.

My mplayer command is the default: mplayer -fs -zoom -quiet -vo xv,
but I've also been playing with various other setting, none of which
seem to be any better.

The log file spits out the following two pieces, the first is the
mplayer info when it starts to play the file, the 2nd is the usual
error about the system being too slow.

Thanks,

Scott





Compiled with runtime CPU detection.
Can't open joystick device /dev/input/js0: No such file or directory
Can't init input joystick
Playing
[mkv] Track ID 1: video (V_MPEG4/ISO/AVC) "x264 - 2 passes", -vid 0
[mkv] Track ID 2: audio (A_AC3) "AC3 - 640 kbit/sec", -aid 0, -alang eng
[mkv] Track ID 3: audio (A_AC3) "AC3 - 384 kbit/sec", -aid 1, -alang dut
[mkv] Track ID 4: subtitles (S_TEXT/UTF8), -sid 0, -slang eng
[mkv] Track ID 5: subtitles (S_TEXT/UTF8), -sid 1, -slang dut
[mkv] Will play video track 1.
Matroska file format detected.
VIDEO:  [avc1]  1920x800  24bpp  23.976 fps    0.0 kbps ( 0.0 kbyte/s)
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264)
==========================================================================
==========================================================================
Forced audio codec: hwac3
Opening audio decoder: [hwac3] AC3/DTS pass-through S/PDIF
No accelerated IMDCT transform found
hwac3: switched to AC3, 640000 bps, 48000 Hz
AUDIO: 48000 Hz, 2 ch, ac3, 640.0 kbit/41.67% (ratio: 80000->192000)
Selected audio codec: [hwac3] afm: hwac3 (AC3 through S/PDIF)
==========================================================================
AO: [alsa] 48000Hz 2ch ac3 (1 bytes per sample)
Starting playback...
VDec: vo config request - 1920 x 800 (preferred colorspace: Planar YV12)
VDec: using Planar YV12 as output csp (no 0)
Movie-Aspect is 2.40:1 - prescaling to correct movie aspect.
VO: [xv] 1920x800 => 1920x800 Planar YV12  [fs] [zoom]
[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!

            ************************************************
            **** Your system is too SLOW to play this!  ****
            ************************************************

Possible reasons, problems, workarounds:
- Most common: broken/buggy _audio_ driver
   - Try -ao sdl or use the OSS emulation of ALSA.
   - Experiment with different values for -autosync, 30 is a good start.
- Slow video output
   - Try a different -vo driver (-vo help for a list) or try -framedrop!
- Slow CPU
   - Don't try to play a big DVD/DivX on a slow CPU! Try some of the 
lavdopts,
     e.g. -vfm ffmpeg -lavdopts lowres=1:fast:skiploopfilter=all.
- Broken file
   - Try various combinations of -nobps -ni -forceidx -mc 0.
- Slow media (NFS/SMB mounts, DVD, VCD etc)
   - Try -cache 8192.
- Are you using -cache to play a non-interleaved AVI file?
   - Try -nocache.
Read DOCS/HTML/en/video.html for tuning/speedup tips.
If none of this helps you, read DOCS/HTML/en/bugreports.html.


Too many video packets in the buffer: (41 in 8649863 bytes).
Maybe you are playing a non-interleaved stream/file or the codec failed?
For AVI files, try to force non-interleaved mode with the -ni option.