Problems with S/PDIF Passthrough

[SubUria]

Comp specs:
I have a M-Audio Delta Audiophile 2496 soundcard, C2Q Q6600, 4GB RAM just ot mention the specs on my comp.
The reciever is an Sony STR-DB870.

After 6 hours exprimental button pushing back and forward i have finally made a big step forward.
Only One problem remaning, one big.

In some of the movies the audio glitches, or what to say, the display on my Sony Hi-Fi reciever is changing rapidly between "Dolby Surround [3/2]" and "DVD/LD" and the Multi Channel Decoding lamp is flashing also rapidly.

Disabling SPDIF passthrough seems to fix the sound on all movies. The volume and quality seems to be lower.

All my music and some of the movies can be played with the passthrough.
An interesting and maybe helpful detail is that when I restrict the sample rate i AC3 filter option to 48KHz, only some movies audio will work.
When i restict sample rate to 44KHz, SPDIF is automaticly changed to disabled and all the movies audio work.

When SPDIF is disabled by me or sample rate is restricted to 44KHz, the display on the reciever shows "PCM [48KHz]". Otherwise it shows "Dolby Surround [3/2] or DTS[3/2]

I have read a bunch of threads but haven't come up with a solution. So now i'm asking you guys!
Thanks in advance, Jon

[setarip_old]

Hi!some of the movies can be played with the passthrough.Are these original, commercial DVDs, backup DVD copies you've made, or something else?

[SubUria]

Hi!Are these original, commercial DVDs, backup DVD copies you've made, or something else?

Almost all of them are HD DVD and Bluray x264 rips, some HDTV..
Most DTS works, some AC3 5.1, and most Dolby 5.1/2.0.
Sometimes it's just work right after a restart.

[setarip_old]

Did you use different software and/or procedures when, from the original source material, you created those videos that are problematic versus the software and/or procedures you used to create those videos that play properly?

[SubUria]

Sorry for my incomplete info. I haven't ripped them myself. Most of them are from HDbits.

[foxyshadis]

In that case, you might want to take a closer look at our rule #6 (http://forum.doom9.org/forum-rules.htm) and the newbies clarifying announcement (https://forum.doom9.org/announcement.php?f=6). It's typically much easier to debug problems when you rip things yourself, anyway!