Audio reverb on avi file

[celyr]

Hi,

I'm having troubles with some .avi files that play perfectly on my laptop (using vlc and windows media player) but playing it on my PCH C-200 results in a stuttering\reverbering audio. It's just impossible to even understand the speech.
Here there is an avinaptic analisys of the file:

[ About file ]
Name: prova.avi
Date: Sat, 07 Jul 2012 15:41:58 +0200
Size: 366,747,648 bytes (349.757813 MiB)

[ Magic ]
File type: RIFF (little-endian) data, AVI, 480 x 272, 25.00 fps, video: DivX 5, audio: MPEG-1 Layer 3 (stereo, 22050 Hz)

[ Generic infos ]
Duration: 00:45:22 (2722.08 s)
Container: AVI OpenDML
AVI has index: Yes
Total tracks: 2
Track nr. 0: video
Track nr. 1: audio
ISFT: VirtualDubMod 1.5.4.1 (build 2178/release)
Junk: VirtualDubMod build 2178/release

[ Relevant data ]
Resolution: 480 x 272
Width: multiple of 32
Height: multiple of 16
Average DRF: 2.59819
Standard deviation: 0.490264
Std. dev. weighted mean: 0.488927

[ Video track ]
FourCC: divx/DX50
Resolution: 480 x 272
Frame aspect ratio: 30:17 = 1.764706 (~16:9)
Pixel aspect ratio: 1:1 = 1
Display aspect ratio: 30:17 = 1.764706 (~16:9)
Framerate: 25 fps
Total frames: 68,052
Stream size: 345,681,538 bytes (329.667604 MiB)
Bitrate: 1015.933516 kbps
Qf: 0.311254
Key frames: 916 (0; 250; 367; 617; 773; ... 67936)
Null frames: 0
Min key int: 1
Max key int: 250
Avg key int: 74.292576
Delay: 0 ms

[ Audio track ]
Audio tag: 0x55 (MP3)
Channels: 2
Bitrate: 49.624 kbps VBR
Chunks: 104,205
Stream size: 16,884,116 bytes (16.101948 MiB)
Bitstream type (bs): MPEG-2 Layer III
Encoder (bs): LAME3.96r
Frames (bs): 104,205
Duration (bs): 00:45:22 (2722.089796 s)
Chunk-aligned (bs): Yes
Bitrate (bs): 49.62104 kbps VBR
Sampling frequency (bs): 22050 Hz
Mode (bs): joint stereo
Padding (bs): No
Emphasis (bs): none
Preload: 522 ms
Max A/V diff: 548 ms
Delay: 0 ms

[ Video bitstream ]
Bitstream type: MPEG-4 Part 2
User data: DivX503b1338
Packed bitstream: No
QPel: No
GMC: No
Interlaced: No
Aspect ratio: Square pixels
Quant type: H.263
Total frames: 68,052
Drop/delay frames: 0
Corrupt frames: 0

I-VOPs: 916 ( 1.346 %)
P-VOPs: 67136 ( 98.654 %) ####################
B-VOPs: 0 ( 0.000 %)
S-VOPs: 0 ( 0.000 %)
N-VOPs: 0 ( 0.000 %)

[ DRF analysis ]
average DRF: 2.59819
standard deviation: 0.490264
max DRF: 3

DRF<2: 0 ( 0.000 %)
DRF=2: 27344 ( 40.181 %) ########
DRF=3: 40708 ( 59.819 %) ############
DRF>3: 0 ( 0.000 %)

I-VOPs average DRF: 2.290393
I-VOPs std. deviation: 0.453944
I-VOPs max DRF: 3

P-VOPs average DRF: 2.602389
P-VOPs std. deviation: 0.489404
P-VOPs max DRF: 3

[ Profile compliancy ]
Selected profile: MTK PAL 6000
Resolution: Ok
Framerate: Ok
Min buffer fill: 80%

This report was created by AVInaptic (18-12-2011) on 16-07-2012 19:36:26

Do you have idea of what's wrong and how can i fix it ? Thanks

[celyr]

MediaInfo:

Format : AVI
Format/Info : Audio Video Interleave
File size : 350 MiB
Duration : 45mn 22s
Overall bit rate mode : Variable
Overall bit rate : 1 078 Kbps
Writing application : VirtualDubMod 1.5.4.1 (build 2178/release)
Writing library : VirtualDubMod build 2178/release

Video
ID : 0
Format : MPEG-4 Visual
Format settings, BVOP : No
Format settings, QPel : No
Format settings, GMC : No warppoints
Format settings, Matrix : Default (H.263)
Codec ID : DX50
Codec ID/Hint : DivX 5
Duration : 45mn 22s
Bit rate : 1 016 Kbps
Width : 480 pixels
Height : 272 pixels
Display aspect ratio : 16:9
Frame rate : 25.000 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.311
Stream size : 330 MiB (94%)
Writing library : DivX 5.2.1 (DrDivX 106) (UTC 2004-09-08)

Audio
ID : 1
Format : MPEG Audio
Format version : Version 2
Format profile : Layer 3
Mode : Joint stereo
Mode extension : MS Stereo
Codec ID : 55
Codec ID/Hint : MP3
Duration : 45mn 22s
Bit rate mode : Variable
Bit rate : 48.0 Kbps
Channel(s) : 2 channels
Sampling rate : 22.05 KHz
Compression mode : Lossy
Stream size : 16.1 MiB (5%)
Alignment : Aligned on interleaves
Interleave, duration : 26 ms (0.65 video frame)
Interleave, preload duration : 574 ms
Writing library : LAME3.96r
Encoding settings : -m j -V 4 -q 2 -lowpass 7.5 --abr 48

[Bytec]

You should tell us more about your setup.

My guess is that you are listening to sound simultaneously from TV speakers and separate speakers connected through AV receiver or some other separate speaker setup.

This setup can cause a slight delay in sound coming from TV or speakers and resulting effect would sound similar to reverberation.

If my guess is right then simply turn off one of the sound sources.

[celyr]

No, it's not like that. It's like an heavy stuttering it goes like sound-pause-sound-pause-sound-pause.
I think after some work that the problem is this one:
Sampling rate : 22.05 KHz
I have lot's of avi files and everyone plays perfect except those with this sampling rate.
I have a doubt, may it be my sound system ? The audio is sent to it via HDMI in passthrought. The sound system is a: Sony RHT-G950

EDIT: it's not my sound system, i've tried with another TV and excluding it and the problem still there. I've also tried to set all audio to downmix in setup and same issue. So i'm sure it's a PCH problem.

EDIT2: remuxing it with handbrake "fixes" the problem. I still don't get why it doesn't work

EDIT3: it's not even a PCH issue, Audio over HDMI can't have a sample rate minor of 32k, so 22 won't play over HDMI. You need to upsample them. The only thing that PCH can do it's to upsample it on the fly.

EDIT4: The funny thing is that this audio works:
Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : A_AAC
Duration : 45mn 22s
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 22.05 KHz
Compression mode : Lossy
Default : Yes
Forced : No

Wich is the same as above reencoded. I don't get why lol. Any idea ?

[celyr]

I'm having again this issue on multiple file, this time ~100, it would be a bit heavy to reencode them all, can anybody help me please.

[accident]

The solution is going to be the same for your existing files..

Perhaps the long term solution should be how your getting these files in the first place. If your getting files that are always problematic, then perhaps avoiding certain release groups or looking for different formats would improve your experience.