poor performance with .ogm, divx5 and vorbis

[Goose]

I have been experiencing poor playback performance in MP when playing back an .ogm container with divx5 video and vorbis audio. The videos in question play but they are extremely choppy, clearly dropping frames and lots of audio stutter. Strangely though high res H264 playback is fine, so it is not a crappy system thing (as you would expect from the specs listed below.

Also playback in anything other than mp is flawless. That inculdes MPC, windows MP and even VLC.

These particular videos have always seemed to play poorly in MP. I used to have an old crappy machine with mp on it and they would play poorly on that pc, which i attributed to the hardware, however this is not that case now, especially when they play well in any other player. I use ffdshow for playback and by default i have some filters improving video quality. The performance is the same whether i disable the filters or not. I have also turned of evr to see if that could be it, to no avail. I am running a recent SVN.

The videos in question are japanese anime, they are from various release groups, but always these 3 culprits.

I was considering remuxing the videos in question to see what the issue is specifically. Id est. the .ogm container or divx5 or vorbis. Interestingly though i have other media with one or two of these culprits in them that play ok. eg. an .mkv with divx5 video and vorbis for audio or a .ogm with xvid and mp3.

I believe the issue is related to the built in directshow player but i am not really sure on how to verify.

any help would be most appreciated.

this post is rather ironic due to my signature

TV-Server Version:
MediaPortal Version: SVN
MediaPortal Skin: Indigo 1.6
Windows Version: Vista
CPU Type: Athlon X2 @ 2.6
HDD: WD 200GB and 4 x WD 1TB in raid 5 on Dell Perc 5i
Memory: 3GB DDR-400
Motherboard: MSI K8N Diamond Plus
Motherboard Chipset: Nvidia Nforce 4 SLI x16
Motherboard Bios: MSI v1.2
Video Card: MSI/ATI 2600XT
Video Card Driver: generally the latest
Sound Card: onboard SB Audigy zs
Sound Card AC3: coax and optical
Sound Card Driver: generally the latest
1. TV Card:
1. TV Card Type:
1. TV Card Driver:
2. TV Card:
2. TV Card Type:
2. TV Card Driver:
3. TV Card:
3. TV Card Type:
3. TV Card Driver:
4. TV Card:
4. TV Card Type:
4. TV Card Driver:
MPEG2 Video Codec: MPV
MPEG2 Audio Codec: MPA
Satelite/CableTV Provider:
HTPC Case:
Cooling: Fans, duh
Power Supply: thermal take 750Watt
Remote: Microsoft MCE Europe edition
TV: samsung 32" lcd
TV - HTPC Connection: Dsub

[splatterpop]

Hey, I just had that same issue today (again). Heres the solution (using ffdshow).

+ open ffdshow audio decoder setup
+ go to "codecs" section and verify libavcodec is used to decode vorbis audio
+ now go to "output"
+ disable all sample formats except 16 bit integer
+ choose "connect to direct sound"

The odd thing is, WMP does not have this problem at all and works without these tweaks. I think MP is perhaps not quite as compatible in this aspect.

Cheers, splatterpop

[Goose]

@splatterpop

First let me say that you have a rather interesting handle there. Evokes some interesting imagery.

Thanks for your post. Its good to see someone sharing solutions rather then just problems.

I also solved the issue. I solved it a different way though.

I disabled ffdshow for divx and installed the MPC filter. I still use ffdshow for post processing though.

EDIT: I will test your solution and if it fixes it for me I will update my codec guide and let the ffdshow guys know about it.