I am no expert at video codecs. My problem is that I have a series of MP4 files to make up a video, only one of the files sounds like a chipmunk. The video is fine but the audio speed is off. In Windows media player the file plays fine but in MEP it sounds like Alvin and the chipmunks. Can somebody walk me through this?
If you don't already have it please download and install the free MediaInfo, point it to the video file whose audio is at the wrong speed and paste the results of the Text view to your next reply.
My suspicion is that the Audio Sampling Rate of your "chipmunk" file is different to what MEP expects.
Just to be clear, is the video of this particular file also speeded up or does it play normally?
Jeff
The video seems to be the correct speed and the audio is synced but it sounds like chipmunks
General
Complete name : C:\U.***********
Format : MPEG-4
Format profile : Base Media / Version 1
Codec ID : mp41 (mp41)
File size : 3.73 GiB
Duration : 11 min 49 s
Overall bit rate mode : Variable
Overall bit rate : 45.1 Mb/s
Encoded date : UTC 2015-01-28 00:26:20
Tagged date : UTC 2015-01-28 00:26:20
AMBA : x
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.1
Format settings : CABAC / 1 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 1 frame
Format settings, GOP : M=1, N=12
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 11 min 49 s
Bit rate mode : Variable
Bit rate : 45.0 Mb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.905
Stream size : 3.71 GiB (100%)
Title : GoPro AVC
Language : English
Encoded date : UTC 2015-01-28 00:26:20
Tagged date : UTC 2015-01-28 00:26:20
Color range : Full
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
Codec configuration box : avcC
Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 11 min 49 s
Bit rate mode : Constant
Bit rate : 128 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 : 10.8 MiB (0%)
Title : GoPro AAC
Language : English
Encoded date : UTC 2015-01-28 00:26:20
Tagged date : UTC 2015-01-28 00:26:20
Other #1
ID : 3
Type : Time code
Format : QuickTime TC
Duration : 11 min 49 s
Frame rate : 23.976 (24000/1001) FPS
Title : GoPro TCD
Language : English
Encoded date : UTC 2015-01-28 00:26:20
Tagged date : UTC 2015-01-28 00:26:20
Other #2
Type : Time code
Bit rate mode : Variable
Time code of first frame : 00:26:28:04
Time code, striped : Yes
Reid
I have other files from the same session which do not have a problem
Were all the files in question recorded using the same file format. I notice this one has a QuickTime TC signature.
Are the other three straight MP4 files and not mov.(QuickTime) Files?
Even so I can't think why this would happen but MEP seems to have more problems with QuickTime files than other formats. If you right click the sound track you may be able to use one of the tools to bring the frequency response back to normal if everything else fails and no-one has a solution for you.
The other thing I don't understand is where the additional info comes from after the - Other #1 and Other #2.
here is info for a file that is working, both files are from the same session on my gopro. It breaks the files into 4GB chunks they all work but that one file.
Its my first time using MEP2000 so I dont know if I did something wrong. but I reloaded the bad file from scratch several times from the source and I get the same result
Here is the info from a companion file that works fine
General
Complete name : C:\**********
Format : MPEG-4
Format profile : Base Media / Version 1
Codec ID : mp41 (mp41)
File size : 3.73 GiB
Duration : 11 min 49 s
Overall bit rate mode : Variable
Overall bit rate : 45.1 Mb/s
Encoded date : UTC 2015-01-28 00:14:30
Tagged date : UTC 2015-01-28 00:14:30
AMBA : x
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.1
Format settings : CABAC / 1 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 1 frame
Format settings, GOP : M=1, N=12
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 11 min 49 s
Bit rate mode : Variable
Bit rate : 45.0 Mb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.905
Stream size : 3.71 GiB (100%)
Title : GoPro AVC
Language : English
Encoded date : UTC 2015-01-28 00:14:30
Tagged date : UTC 2015-01-28 00:14:30
Color range : Full
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
Codec configuration box : avcC
Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 11 min 49 s
Bit rate mode : Constant
Bit rate : 128 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 : 10.8 MiB (0%)
Title : GoPro AAC
Language : English
Encoded date : UTC 2015-01-28 00:14:30
Tagged date : UTC 2015-01-28 00:14:30
Other #1
ID : 3
Type : Time code
Format : QuickTime TC
Duration : 11 min 49 s
Frame rate : 23.976 (24000/1001) FPS
Title : GoPro TCD
Language : English
Encoded date : UTC 2015-01-28 00:14:30
Tagged date : UTC 2015-01-28 00:14:30
Other #2
Type : Time code
Bit rate mode : Variable
Time code of first frame : 00:14:39:04
Time code, striped : Yes
Hi.
They look similar to me to me and I can't think of a reason why the pitch should change. Have you tried right clicking the file and asking it to be played in the external audio editor? See if it plays normally there.
Do not press 'Save Project' when exiting and no changes to the file will happen.
Ray.
Hi
. . . . . It breaks the files into 4GB chunks they all work but that one file . . . . .
With the exception of the encoding time the data for the 2 files are perfectly identical, which is impossible to achieve with 2 separate recordings.
Are the 2 files you have posted data for part of one long recording that has been spread over several chunks?
If so, what position in that recording chunk sequence, is the one that does not work ?
John EB
Hi John.
If you look at the two time stamps of the files above you will see the effected files precedes the one that is reported to be OK and match time-wise to where the first would finish.
Hi Ray
That is why I commented that these appear to be part of a longer sequence of chunks and asked where in the chunk sequence the file that does not work is.
John EB
Hi
. . . . . It breaks the files into 4GB chunks they all work but that one file . . . . .
With the exception of the encoding time the data for the 2 files are perfectly identical, which is impossible to achieve with 2 separate recordings.
Are the 2 files you have posted data for part of one long recording that has been spread over several chunks?
If so, what position in that recording chunk sequence, is the one that does not work ?
John EB
Yes my Gopro camera breaks the recording into equal chunks. One works one does not. The one that has a problem is #3 out of 4
I tried reloading it I can't figure
What i ended up doing is playing the file in Mediaplayer while I recorded it with MEP I then synced the new audio with the corrupted audio and replaced it.
It worked out perfectly.
the audio file graphs matched perfectly except for the first quarter of it. I was able to sync the last half and it worked seamlesly with the video.
I tried recording the video also at first but it was severely degraded so I did just the audio.
I hope that doesnt happen again. Thanks for all of your help guys Ill be doing more video in a few weeks
I have been using the same camera for a few years and never had this happen with MEP2016
Maybe the file itself had a corruption in it. This is my first movie after upgrading to MEP 2020
I should have got a screenshot of it the first quarter of the audio was completely filled top to bottom which was different than the repaired audio but the last 3/4 of it looked the same so I was able to sync it perfectly.
The strange thing is that the first quarter which looked different sounded like gibberish just spikes but the part of the audio that looked ok on the graph sounded like Alvin and the chipmunks
Hi
. . . . The one that has a problem is #3 out of 4 . . . .
Did the GoPro come with an app to extract the video files from the camera and recombine the chunks back into 1 file?
If so try using it to import the files from the camera.
HTH
John EB
Gopro does have an app that takes forever to combine the mp4 files into whatever format you like but I usually just download the mp4 files and simply join them in MEP. it saves a step and IMO possible some degradation plus I dont have yet another buggy app to deal with
Gopro does have some internal info of its own in the files that it uses in the app foe effects or color correction ect. That is what you are seeing in the MP4 info. I dont see anything wrong with the pure mp4 but if you get into high speed sports and fish eye issues the Gopro software may come in play for that. Im not dealing with that right now since I sold my GSXR750. Im just using the camera in narrow mode 1080 for in home recordings