[AppleTV2] Problem with Dolby Digital 5.1
#1
Hi folks,

today I tried to watch a movie on my ATV2. After some minutes I experienced an asynchronism between audio and video. I searched the whole morning for some information but could not find anything that would help. Maybe here is somebody who can help me out.

Here is my configuration:
  • Apple TV 2 with iOS 4.3 (JB)
  • The latest nightly build of XBMC 11th, October 2011
  • The ATV2 is connected by HDMI to my Pioneer VSX 921 (Video and Audio). The Pioneer VSX 921 is connected to my Samsung LED TV.



Here is the output of the movie which causes the lip sync problem
Code:
General
Complete name                            : Splice - Das Genexperiment.mp4
Format                                   : MPEG-4
Format profile                           : Base Media / Version 2
Codec ID                                 : mp42
File size                                : 4.58 GiB
Duration                                 : 1h 37mn
Overall bit rate                         : 6 699 Kbps
Encoded date                             : UTC 2011-08-23 09:40:24
Tagged date                              : UTC 2011-08-23 09:40:24
Writing library                          : Apple QuickTime
Cover                                    : Yes
tvsh                                     : 20110720 2310 - Sky Cinema HD - Splice - Das Genexperiment

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : [email protected]
Format settings, CABAC                   : No
Format settings, ReFrames                : 2 frames
Format settings, GOP                     : M=2, N=50
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 1h 37mn
Bit rate mode                            : Variable
Bit rate                                 : 6 170 Kbps
Maximum bit rate                         : 14.0 Mbps
Width                                    : 1 280 pixels
Height                                   : 720 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 50.000 fps
Standard                                 : PAL
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.134
Stream size                              : 4.22 GiB (92%)
Title                                    : Apple Video Mediensteuerung
Language                                 : English
Encoded date                             : UTC 2011-08-23 09:40:24
Tagged date                              : UTC 2011-08-23 09:40:24
Color primaries                          : BT.709-5, BT.1361, IEC 61966-2-4, SMPTE RP177
Transfer characteristics                 : BT.709-5, BT.1361
Matrix coefficients                      : BT.709-5, BT.1361, IEC 61966-2-4 709, SMPTE RP177

Audio #1
ID                                       : 2
Format                                   : AAC
Format/Info                              : Advanced Audio Codec
Format profile                           : LC
Codec ID                                 : 40
Duration                                 : 1h 37mn
Bit rate mode                            : Constant
Bit rate                                 : 128 Kbps
Channel(s)                               : 2 channels
Channel positions                        : Front: L R
Sampling rate                            : 48.0 KHz
Compression mode                         : Lossy
Stream size                              : 88.0 MiB (2%)
Title                                    : Apple Ton Mediensteuerung
Language                                 : English
Encoded date                             : UTC 2011-08-23 09:40:24
Tagged date                              : UTC 2011-08-23 09:40:24

Audio #2
ID                                       : 3
Format                                   : AC-3
Format/Info                              : Audio Coding 3
Mode extension                           : CM (complete main)
Codec ID                                 : ac-3
Duration                                 : 1h 37mn
Bit rate mode                            : Constant
Bit rate                                 : 384 Kbps
Channel(s)                               : 6 channels
Channel positions                        : Front: L C R, Side: L R, LFE
Sampling rate                            : 48.0 KHz
Bit depth                                : 16 bits
Compression mode                         : Lossy
Stream size                              : 269 MiB (6%)
Title                                    : Apple Ton Mediensteuerung
Language                                 : English
Encoded date                             : UTC 2011-08-23 09:40:24
Tagged date                              : UTC 2011-08-23 09:40:24

The file was recorded on my Dreambox 8000HD and transcoded to MP4 using the Turbo.264HD. When I add the file to iTunes and play it by using the ATV2, no lip sync problem occurs. I also can play the file on my Dreambox 8000HD without any problems. But playing the file on the ATV2 using XBMC causes the lip sync problem.

Does anybody have an idea what is causing the problem? I tried all settings
in XBMC but could not come to a conclusion.

Any help is appreciated. Thanks Smile

Best regards
MausFan
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#2
Is it ahead or behind? Simply adjust the audio sync in the settings for the clip?
Reply
#3
I suspect the problem is because the file is recorded at 50fps. The ATV2 seems to have problems with 50fps and 60fps contents. There are a few other threads that report similar issues.
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