No audio on some mp4 video

[bucknaked007]

also a couple of mkv? noticed this on a few music videos

1 example below is

bit rate 165kbps

channels 2 [stereo]

audio sample rate 48kHz

any suggestion please?

[StephenB]

My suggestion is to post the mediainfo.

[bucknaked007]

I thought I did, how do I find more info?

[StephenB]

Originally Posted by bucknaked007

I thought I did, how do I find more info?

www.videohelp.com/tools/mediainfo

Select the text view, cut/paste the entire analysis. Hide the file name if you like, but it is helpful to see the rest.

[bucknaked007]

great, here tis one example

General
Complete name : \\READYSHARE\USB_Storage\Family Drive\Music Vids\Bruno Mars - The Lazy Song.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom
File size : 141 MiB
Duration : 3mn 17s
Overall bit rate mode : Variable
Overall bit rate : 5 990 Kbps
Movie name : The Lazy Song
Performer : Bruno Mars
Genre : R&B
Recorded date : 2011
Encoded date : UTC 2011-04-23 09:29:46
Tagged date : UTC 2011-04-23 09:29:46
Writing application : Lavf51.12.1

Video
ID : 1
Format : MPEG-4 Visual
Format profile : Simple@L1
Format settings, BVOP : No
Format settings, QPel : No
Format settings, GMC : No warppoints
Format settings, Matrix : Default (H.263)
Codec ID : 20
Duration : 3mn 17s
Bit rate : 5 821 Kbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.263
Stream size : 137 MiB (97%)
Writing library : Lavc51.40.4
Encoded date : UTC 2011-04-23 09:29:46
Tagged date : UTC 2011-04-23 09:29:46

Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 3mn 16s
Bit rate mode : Variable
Bit rate : 165 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Compression mode : Lossy
Stream size : 3.88 MiB (3%)
Encoded date : UTC 2011-04-23 09:29:46
Tagged date : UTC 2011-04-23 09:29:46

[bucknaked007]

and here's another

General
Unique ID : 245899321596998014478704217435351980926 (0xB8FE7C96DA12C3DA9D003BA17E429B7E)
Complete name : \\READYSHARE\USB_Storage\Family Drive\Music Vids\Noel Gallagher's High Flying Birds.mkv
Format : Matroska
Format version : Version 2
File size : 348 MiB
Duration : 52mn 30s
Overall bit rate : 927 Kbps
Encoded date : UTC 2012-04-15 18:07:23
Writing application : mkvmerge v5.5.0 ('Healer') built on Apr 6 2012 21:43:24
Writing library : libebml v1.2.3 + libmatroska v1.3.0

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L3.1
Format settings, CABAC : Yes
Format settings, ReFrames : 2 frames
Muxing mode : Header stripping
Codec ID : V_MPEG4/ISO/AVC
Duration : 52mn 30s
Bit rate mode : Constant
Nominal bit rate : 836 Kbps
Width : 640 pixels
Height : 360 pixels
Display aspect ratio : 16:9
Frame rate : 29.970 fps
Standard : Component
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.121
Default : Yes
Forced : No
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
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : A_AAC
Duration : 52mn 30s
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 44.1 KHz
Compression mode : Lossy
Delay relative to video : 15ms
Default : Yes
Forced : No

[bucknaked007]

Hi, see any reason they play with no audio?

[muzicman61]

What are the audio settings on the Neo? Are they set to passthrough? It could be the AAC audio. You could try transcoding the audio to AC3 using VID2EVA.

[bucknaked007]

YES that did it, set the AAC to HDMI pass-through, had previously played with these settings back think you have to go right back and replay video to get them to take affect?

anyway, it’s all good, cheers for your help

[Maineguy]

What video player software you use? I advise you to try another one to play the MP4 video like VLC media player ... In addition, you can download klite codec pack from the internet to see if it can solve your problem, as i ever solved the similar problem for MP4 video ripped from a DVD on Mac ...