Solved Sub channel from audio?

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I'm helping a school with some video but the audio contains some loud hash.   I tried to record the audio into Sound Forge and separate the channels, but when I did, I got what appears to be a subchannel on the recording.   It looks like this.   I'm using SF 15, but I get the same result on SF 9.   Any ideas how to eliminate this sub-channel?

 

Thanks!

John
 
06 Sep 2021 07:02 #1
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Replied by DoctorZen on topic Sub channel from audio?

Sorry for the delay in responding to your question.

To discover what type of audio and how many tracks are encoded with the video, use MediaInfo app to create a report and then upload to the forum - then I can see exactly what you have.
I have instructions on how to use MediaInfo here:
www.moviestudiozen.com/free-tutorials/miscellaneous-help-tutorials/640-how-to-use-mediainfo-app

Do you use Vegas Pro or Vegas Movie Studio ?
If you own either of these two programs, you can set the Project Properties to 5.1 Surround (if that's what the video is using) and when you import the video, each audio track will be on it's own track.

Regards
Derek
:idea: Remember to turn everything off at least once a week, including your brain, then sit somewhere quiet and just chill out.
Unplugging is the best way to find solutions to your problems. If you would like to share some love, post a customer testimonial or make a donation.
Peace :)
09 Sep 2021 16:07 #2

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Replied by jhendry01 on topic Sub channel from audio?

Thanks for the reply, Derek,

No, I do not have the two programs you mentioned.   I have Sound Forge Audio v 15 and 9.   The video program i have Is Corel Video Studio 19.

Here is the dump from the MediaInfo file.

Format                                   : AVI
Format/Info                              : Audio Video Interleave
File size                                : 46.5 MiB
Duration                                 : 4 min 58 s
Overall bit rate mode                    : Variable
Overall bit rate                         : 1 306 kb/s

Video
ID                                       : 0
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L3.1
Format settings                          : CABAC / 4 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 4 frames
Format settings, GOP                     : M=1, N=16
Codec ID                                 : h264
Duration                                 : 4 min 58 s
Bit rate mode                            : Variable
Bit rate                                 : 1 036 kb/s
Maximum bit rate                         : 14.0 Mb/s
Width                                    : 1 280 pixels
Original width                           : 1 008 pixels
Height                                   : 1 024 pixels
Original height                          : 672 pixels
Display aspect ratio                     : 4:3
Frame rate                               : 14.985 (15000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.053
Stream size                              : 36.9 MiB (79%)

Audio #1
ID                                       : 1
Format                                   : ADPCM
Format profile                           : U-Law
Codec ID                                 : 7
Codec ID/Hint                            : CCITT
Duration                                 : 4 min 53 s
Source duration                          : 19 min 58 s
Bit rate mode                            : Constant
Bit rate                                 : 16.0 kb/s
Channel(s)                               : 1 channel
Sampling rate                            : 8 000 Hz
Bit depth                                : 8 bits
Stream size                              : 2.29 MiB (5%)
Interleave, duration                     : 125  ms (1.87 video frames)
Interleave, preload duration             : 2000  ms

Audio #2
ID                                       : 2
Format                                   : ADPCM
Format profile                           : U-Law
Codec ID                                 : 7
Codec ID/Hint                            : CCITT
Duration                                 : 4 min 53 s
Source duration                          : 19 min 58 s
Bit rate mode                            : Constant
Bit rate                                 : 16.0 kb/s
Channel(s)                               : 1 channel
Sampling rate                            : 8 000 Hz
Bit depth                                : 8 bits
Stream size                              : 2.29 MiB (5%)
Interleave, duration                     : 125  ms (1.87 video frames)
Interleave, preload duration             : 2000  ms

Audio #3
ID                                       : 3
Format                                   : ADPCM
Format profile                           : U-Law
Codec ID                                 : 7
Codec ID/Hint                            : CCITT
Duration                                 : 4 min 53 s
Source duration                          : 19 min 58 s
Bit rate mode                            : Constant
Bit rate                                 : 16.0 kb/s
Channel(s)                               : 1 channel
Sampling rate                            : 8 000 Hz
Bit depth                                : 8 bits
Stream size                              : 2.29 MiB (5%)
Interleave, duration                     : 125  ms (1.87 video frames)
Interleave, preload duration             : 2000  ms

Audio #4
ID                                       : 4
Format                                   : ADPCM
Format profile                           : U-Law
Codec ID                                 : 7
Codec ID/Hint                            : CCITT
Duration                                 : 4 min 53 s
Source duration                          : 19 min 58 s
Bit rate mode                            : Constant
Bit rate                                 : 16.0 kb/s
Channel(s)                               : 1 channel
Sampling rate                            : 8 000 Hz
Bit depth                                : 8 bits
Stream size                              : 2.29 MiB (5%)
Interleave, duration                     : 125  ms (1.87 video frames)
Interleave, preload duration             : 2000  ms

Text
ID                                       : 5
Stream size                              : 148 KiB (0%)




thanks

JH
10 Sep 2021 12:41 #3

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Replied by DoctorZen on topic Sub channel from audio?

Thanks for providing that information.

You have provided an "X-file".
I have never seen an Audio readout like that before!
If I am interpreting the media info readout correctly, your video is encoded with 4x separate audio tracks and they are all "Mono" audio streams.
When a video like this is played back in a media player, it would be interpreted as 4x optional audio tracks - meaning you could select either one of the four audio tracks to play, but not all four at once - only one!
Example: Each track might be a different alternate language, like in a DVD.

.AVI is also not a normal video container for most videos.
Whenever I see that a video is an .avi, it normally means something weird (non-standard) is happening.

I honestly don't know how to help you any further.
You need to somehow separate all 4 audio tracks into 4 separate tracks.
The video itself looks to be extremely low quality (only 15 fps) - something you would normally see from a "bootleg" video download website or a very old screen capture program.

My guess is that Sound Forge is having problems decoding the file correctly, which is why there are weird audio problems happening.
I dooubt there is anything you can do to fix this, unless a new recording can be made.
 
:idea: Remember to turn everything off at least once a week, including your brain, then sit somewhere quiet and just chill out.
Unplugging is the best way to find solutions to your problems. If you would like to share some love, post a customer testimonial or make a donation.
Peace :)
10 Sep 2021 15:13 #4

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Replied by jhendry01 on topic Sub channel from audio?

That makes sense.  This is from an older school bus camera system.  It's four camera, and apparently each has their own audio stream.   The hash sound I'm hearing is from a non-working camera.   Makes perfect sense now. 
Thanks for your help.

JH
11 Sep 2021 10:05 #5

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