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Video Playback Issues
http://forums.linhes.org/viewtopic.php?f=21&t=21989		 Page 1 of 1
Author:  gatorback [ Sat Jan 22, 2011 2:07 pm ]
Post subject:  Video Playback Issues
I have a high resolution video that stop and skips during playback. Sound is OK though.

The .mp4 video is:

Codec: H264 - MPEG-4 AVC (part 10) (avc1)
Resolution: 1920x816
Frame rate: 23.975686
Content bitrate 4100 kb/S

The Audio is:

Codec: A52 Audio (aka AC3) (a52 )
Language: English
Sample rate: 48000 Hz
Bitrate: 448 kb/s

Playback is fine on a 1.6 GHz dual core laptop using VLC. I would think that the a the 2.4Ghz Dual Core with MythTV would be enough processing power. Myth Hardware details are in the signature below. I think that this is a software issue and not hardware.

Question: What tests can be performed to determine a fix / correction? Specific system commands and any experience with this problem would be appreciated. Thanks.
Author:  poflynn [ Sat Jan 22, 2011 9:33 pm ]
Post subject: 
Are you using/have you tried the internal player? Mplayer?
Author:  gatorback [ Sat Jan 22, 2011 9:44 pm ]
Post subject: 
@poflynn: yes. I am using the native video player. mplayer??
I think, but not sure if this is the mplayer version info:

Code:
[root@mythtv ~]# pacman -Qv mplayer
Root      : /
Conf File : /etc/pacman.conf
DB Path   : /var/lib/pacman/
Cache Dirs: /data/var/cache/pacman/pkg/
Lock File : /var/lib/pacman/db.lck
Log File  : /var/log/pacman.log
Targets   : mplayer
mplayer 29438-1
Author:  manicmike [ Sun Jan 23, 2011 3:22 pm ]
Post subject: 
You don't mention graphics card or hardware acceleration. A newer NVIDIA with VDPAU enabled on your box would make an enormous difference to playability.
You would use the "-vo vdpau" option for mplayer if that's what you are using to play the file.

Mike
Author:  gatorback [ Sun Jan 23, 2011 3:27 pm ]
Post subject: 
I am using a JATON VIDEO-338PCI-TV NVIDIA GEFORCE PCI 6200/256MB with a SD TV. I don't have an HDMI monitor or I would try it out with the MOBO's HDMI output.

@Mike, which file would I need to make the suggested change? I am using the default video player. I do not know if it is mplayer. Is there a command or setting that I could check to verify? Thank you for your guidance.
Author:  Martian [ Sun Jan 23, 2011 7:16 pm ]
Post subject: 
I have some slight stutters and skips with 1080p h.264 on my Dual Core Athlon64 system. The internal player just seems to struggle with 1080p H.264. My solution was to re-encode to 720p since I have a 720p TV but obviously that might no be ideal for everyone.

Martian
Author:  poflynn [ Sun Jan 23, 2011 9:41 pm ]
Post subject: 
the 6200 chipset doesn't support VDPAU so that route won't work. You might consider buying an 8400GS, they're pretty cheap.

I have no idea if your CPU is good enough to decode this file BTW, if it is and there's some other problem, then buying an 8400GS will be a waste of money.

Try running mplayer from the cmd line (alt-x) to see if it spits out any msgs about your system being too slow.

I am assuming the file is on a local HD & not a network share of some sort.
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