DTS Audio Issue

[djo_34]

I have two LG BD-390 Blu-Ray players. One with a Sony XBR-7 TV, the other on an XBR-9. I stream 720p MKV movies from Wild Media Server.

I have had no issues with the exception of some movies with DTS audio would lose volume for a fraction of a second every few seconds. It would be fine for a few seconds, then get soft for 1/2 a second and then be find for a few more.

Remuxing with MKV Merge didn't help.

If I convert the audio to AC3, it works fine. Other DTS MKVs work fine. So I kept track of the ones with issues until I found enough to see a pattern.

Sure enough, it appears as though any MKV with DTS audio and "video delay" set for the audio track, it causes this stutter, or tick. When you open the file in MKV Merge, it doesn't show the current delay setting on the audio track. If it is set for say, 12 ms, and you remux, the delay stays.

If you demux the track and remux with MKV Merge without any delay, the setting is cleared and the audio tick goes away when streaming.

Now, I need to figure out the culprit. On Media Player Classic, the files play with no issue. The LG BD-390 is set to DTS Primary Bypass, so it doesn't process the DTS. So it has to be an issue with the Sony XBR TVs or Wild Media Server.

Does anyone with Wild Media Server experience this audio issue with MKV files and DTS audio with "delay" on the audio track?

You can determine if a file has delay on the audio track with this little file utility, Media Info:

http://mediainfo.sourceforge.net/en

It will display every piece of info for any audio/video file.

[Eugene]

I have two LG BD-390 Blu-Ray players. One with a Sony XBR-7 TV, the other on an XBR-9. I stream 720p MKV movies from Wild Media Server.

I have had no issues with the exception of some movies with DTS audio would lose volume for a fraction of a second every few seconds. It would be fine for a few seconds, then get soft for 1/2 a second and then be find for a few more.

Remuxing with MKV Merge didn't help.

If I convert the audio to AC3, it works fine. Other DTS MKVs work fine. So I kept track of the ones with issues until I found enough to see a pattern.

Sure enough, it appears as though any MKV with DTS audio and "video delay" set for the audio track, it causes this stutter, or tick. When you open the file in MKV Merge, it doesn't show the current delay setting on the audio track. If it is set for say, 12 ms, and you remux, the delay stays.

If you demux the track and remux with MKV Merge without any delay, the setting is cleared and the audio tick goes away when streaming.

Now, I need to figure out the culprit. On Media Player Classic, the files play with no issue. The LG BD-390 is set to DTS Primary Bypass, so it doesn't process the DTS. So it has to be an issue with the Sony XBR TVs or Wild Media Server.

Does anyone with Wild Media Server experience this audio issue with MKV files and DTS audio with "delay" on the audio track?

You can determine if a file has delay on the audio track with this little file utility, Media Info:

http://mediainfo.sourceforge.net/en

It will display every piece of info for any audio/video file.

http://www.wildmediaserver.com/test/sample.mkv - DTS, video delay 7 ms
LG BD reboot with
HDMI: Primary Pass-Thru
Digital Output: Primary Pass-Thru

no problem
HDMI: PCM Stereo
Digital Output: Primary Pass-Thru

Audio is taken from Digital Output. I think LG BD has a problem with the mode: HDMI: Primary Pass-Thru

[djo_34]

Eugene, thanks for checking into this. But the issue is actually the MKV files themselves.

I'm running a gigabit network, although the BD-390 players are 100Mb each. So I know it isn't the network.

Wild Media Server will not transcode ANYTHING... so if one MKV works, they all should.

The BD-390 is set to Primary Pass-Thru so they don't even process the DTS audio.

I noticed that MKVs with DTS Audio and an audio delay all had the issue. But some others did too. And all of them seem to be recent releases. Remuxing them with MKV Merge did not solve the issue. MKV Merge 4 and later seem to have some issues, and 4.2 doesn't work at all. In addition, there is now a COMPRESSION setting which seems to throw a wrench into everything.

So I used TS Muxer to demux and then remuxed with MKV Merge 3.2 and the audio issue goes away.

So if any others start getting DTS audio issues, it isn't the media server or the player, it is the MKV files.