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Why are they different

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Travis Radke
Why are they different
on May 19, 2020 at 1:19:40 am

I have two video clips that dont sound different and both were recorded on obswith the same equipment and settings. but one clip shows spikes in the audio where the other is a flat line. I don't know if this is a problem with OBS or Vegas Pro, can you guys help? The flatline is inconvenient when editing and I dont know whats causing it.


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Francois Pénzes
Re: Why are they different
on May 19, 2020 at 2:56:13 pm

Hi Travis

Can you post Mediainfo on each files ?

Cheers !

PC Win 10 Pro 64-bit 16gb
Ryzen 9 3900X 12 Core 4.60GHz
Radeon RX 5700 XT
Cameras: Canon XF305 + Canon XH-A1 and a bunch of others
Vegas Pro 16, User since Vegas 3.0

''When the cutting stops, the editing begins...''


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Travis Radke
Re: Why are they different
on May 19, 2020 at 5:48:09 pm



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Francois Pénzes
Re: Why are they different
on May 19, 2020 at 6:55:37 pm

Hi Travis

We need to know how the files are internally structured. A picture won't do that. Download this (very useful) little software :

https://mediaarea.net/en/MediaInfo/Download

The resulting text file should look something like this, once to have analyzed it with Mediainfo:



It will give us all the details of your files.

Cheers !

PC Win 10 Pro 64-bit 16gb
Ryzen 9 3900X 12 Core 4.60GHz
Radeon RX 5700 XT
Cameras: Canon XF305 + Canon XH-A1 and a bunch of others
Vegas Pro 16, User since Vegas 3.0

''When the cutting stops, the editing begins...''


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Travis Radke
Re: Why are they different
on May 19, 2020 at 7:51:23 pm

Miss understand the first time. I'll get back to you soon. Thank you.


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Travis Radke
Re: Why are they different
on May 19, 2020 at 10:56:32 pm

This is the one that is flatlining

General
Complete name : D:\videos\TravtayPlays\Twilight Princess\part 2ish.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 1.43 GiB
Duration : 1 h 17 min
Overall bit rate mode : Constant
Overall bit rate : 2 643 kb/s
Writing application : Lavf58.12.100

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.2
Format settings : CABAC / 4 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 4 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 1 h 17 min
Bit rate mode : Constant
Bit rate : 2 500 kb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Variable
Frame rate : 60.000 FPS
Minimum frame rate : 58.824 FPS
Maximum frame rate : 62.500 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.020
Stream size : 1.36 GiB (95%)
Color range : Limited
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.470 System B/G
Codec configuration box : avcC

Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 1 h 17 min
Bit rate mode : Constant
Bit rate : 129 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 44.1 kHz
Frame rate : 43.066 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 71.4 MiB (5%)
Default : Yes
Alternate group : 1




This one is showing accurate spikes in the audio

General
Complete name : D:\videos\TravtayPlays\Twilight Princess\let's play\our tp exp1.mp4
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42 (isom/mp42)
File size : 675 MiB
Duration : 11 min 19 s
Overall bit rate mode : Variable
Overall bit rate : 8 336 kb/s
Encoded date : UTC 2020-05-15 19:21:07
Tagged date : UTC 2020-05-15 19:21:07

Video
ID : 2
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L3.2
Format settings : CABAC / 3 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 3 frames
Format settings, GOP : M=4, N=15
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 11 min 19 s
Bit rate mode : Variable
Bit rate : 8 142 kb/s
Maximum bit rate : 16.0 Mb/s
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 29.970 (30000/1001) FPS
Standard : NTSC
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.295
Stream size : 659 MiB (98%)
Language : English
Encoded date : UTC 2020-05-15 19:21:08
Tagged date : UTC 2020-05-15 19:21:08
Color range : Limited
Codec configuration box : avcC

Audio
ID : 1
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 11 min 19 s
Bit rate mode : Variable
Bit rate : 192 kb/s
Maximum bit rate : 318 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 15.3 MiB (2%)
Language : English
Encoded date : UTC 2020-05-15 19:21:07
Tagged date : UTC 2020-05-15 19:21:07


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Francois Pénzes
Re: Why are they different
on May 20, 2020 at 12:14:03 am

Hi Travis

Just got your Mediainfo. I've got some video packaging to attend right now but I quickly glanced at it and it looks like both of them were recorded with different specs.
I would like to know, if OBS was used to record each of them, why not with the same settings ?

Cheers !

PC Win 10 Pro 64-bit 16gb
Ryzen 9 3900X 12 Core 4.60GHz
Radeon RX 5700 XT
Cameras: Canon XF305 + Canon XH-A1 and a bunch of others
Vegas Pro 16, User since Vegas 3.0

''When the cutting stops, the editing begins...''


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Travis Radke
Re: Why are they different
on May 20, 2020 at 1:04:10 am

That's strange because they were recorded only a couple days apart and within that time I'm pretty sure I didn't change the settings.


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Francois Pénzes
Re: Why are they different
on May 20, 2020 at 12:03:28 pm

Hi Travis

For now, lets try something... Make sure that only the ''flatline'' audio track is selected. Right click on the track and go to Properties. Check box Normalize. Let me know what happens.

Cheers !

PC Win 10 Pro 64-bit 16gb
Ryzen 9 3900X 12 Core 4.60GHz
Radeon RX 5700 XT
Cameras: Canon XF305 + Canon XH-A1 and a bunch of others
Vegas Pro 16, User since Vegas 3.0

''When the cutting stops, the editing begins...''


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Travis Radke
Re: Why are they different
on May 20, 2020 at 7:19:30 pm

That worked. Thank you. I still don't know why my recordings are coming out flatlined but this will help with all my future editing. Thanks again.


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Travis Radke
Re: Why are they different
on May 20, 2020 at 7:22:40 pm

I've noticed that a lot of my renders come out very quiet but normalizing them boost the audio up significantly as well so I think you've managed to fix two things.


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Francois Pénzes
Re: Why are they different
on May 20, 2020 at 8:54:50 pm

Hi Travis

Glade to know it worked out. Keep the recording settings for the one that worked the first time for next you record with OBS.

Cheers !

PC Win 10 Pro 64-bit 16gb
Ryzen 9 3900X 12 Core 4.60GHz
Radeon RX 5700 XT
Cameras: Canon XF305 + Canon XH-A1 and a bunch of others
Vegas Pro 16, User since Vegas 3.0

''When the cutting stops, the editing begins...''


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Mark Barton
Re: Why are they different
on May 23, 2020 at 7:00:08 pm

Check your audio source in OBS. It sounds like you have a microphone input rather than the audio source you intended. If you are trying to capture system sound, you might be catching it at a low volume from a built-in microphone that is picking up the speakers. When you normalize a flat line audio signal, it will boost it, but could be adding a lot of noise and distortion you do not want. If you use bluetooth audio sources, these can sometimes change the OBS settings depending on whether they are connected at the time OBS starts up.


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