Audio desynchronization

Similar Questions

• Derives from audio desynchronization in PE10 (h264 sources)

  I have problems with some h.264 footage recorded with an internal PCI card from Hauppauge Colossus 720 p: when I export the final movie, more time (2 min +) clips can go to shift upward in 1-2 seconds, depending on the length of the clip. It's also in the recently bought first Elements 10. Yes, I know H264 is not the best format of edition, but I have little choice because of the quality of image and the handling of large files.

  The project format that I use is AVCHD 720 p and there is no red band above the clips (except when using effects of course) so I think that the captured material is in its "native" format

  This is the best real: when previewing of the said sequence in PE10 (space key), everything is beautiful and perfectly synchronized. The problem only occurs when you export. So far I have tried:

  * export in various formats (WMV, QT, etc.)

  * addition of Cup every 10-20 seconds in the offending clips

  * time them stretched to 99.9% or 100.1%

  * unrelated audio and video titles and moved these different

  * forced a fixed framerate on the videos from the source - which helps in some situations

  * used different bitrates and formats (fixed and variable bitrates) in capture software

  What I have not tried, but I would have preferred is not:

  * export WMV/QT to the highest setting from capture software and modify this (loss of quality and the intermediate images)

  * divide the. File h264 TS in its video and Audio components (intermediate files and disk space problems)

  As far as I KNOW, this problem happened not in PE9.

  All comments and suggestions are warmly welcomed!

  This comment about high framerate hit an agreement - try searching the knowledge base.

  The only other suggestion I can make is to:

  • unlink the audio / video
  • Audio export
  • convert audio to 48 kHz 16-bit PCM .wav (the free Audacity can do this)
  • remove the original sound of chronology
  • Add audio PCM of chronology.

  Several steps, but it really takes very little time to do.

  See you soon,.
  --
  Neale
  Insanity is hereditary, get you your children

• Problem with audio video

  Hello

  Recently, I downloaded the trial version of Adobe first Pro CC.

  After recording a video with a friend I put it in the first to notice that the audio was falling behind the video. Lets say there is an explosion. You would see the explosion and then to 0. 5 seconds later you'd hear it. At the beginning of the video, it is not noticeable. But as the video goes on it is still worse and worse. This happened since I used it. My friend helped me with setting but it didn't help. When I recorded a 2 and a half minute video, that the audio would be nice, as soon as I record a video of 10-30 m audio falls behind. My friend suspected it could be the transmission speed of the audio. I changed my microphone, headphones and the setting sequence in the first 16-bit 480000Hz, that didn't fix it. When I discovered the original video in windows media player, it is fine. The video is recorded at 1080 p 60 fps.

  Don't forget I use that first for a week or so and only know the basics. My friend has it on his mac book and has not had any problems with it.

  I use windows 8, first is up-to-date.

  Any help is appreciated.

  Audio desynchronization means that the file has variable framerate (no flow)
  Check the file with MediaInfo Windows

  If so convert the constant framerate before importing it with HandBrake

• PSE video and audio go out of sync on finished product

  A very strange problem has developed.  I have a PRE project that plays perfectly into the program itself, but when I exit the project start audio and video in sync but go not synced to the first place where the audio and video clips are spliced.  To be precise, I have a file mp4 audio (.m4a) synchronized with a .mov file.  At the first break, where I spliced m4a, m4a and .mov to .mov, the project is in phase when I play in the video window of PRE.  But when I have the project output, video and audio go out of sync at the first break.  Other facts:

  • PC, 8 GB of RAM, W7, all installed updates.
  • By using the same file .prel about a month ago, it worked well.  (I tried to do a DVD extra of this project, when the problem came.) The only thing related to the video that changed on my machine was a new version of Studio of GoPro.  Just in case, I uninstalled from my computer and the problem of PRE is still there.  Could GoPro have left something it's messing things up?
  • In this case independent of the output - DVD, mp4 format, etc.
  • If I insert an empty picture at the junction stay video/audio synchronized until the next splice point, when he goes back out of sync.
  • It happened first in PRE9, but I also PRE13 (who reads the PRE9 files) and the problem happening there too, in the same way.

  I am completely puzzled, especially because this same project file perfectly synchronized DVD in the past produced.  Any suggestions will be appreciated.

  R.H.L.

  Thanks for the clarification of your question.

  Complexion all the case is if this problem is limited to a single specific project file.

  Here's what I read since you wrote...

  You say that your audio synchronized to export this file in a project is present for Premiere Elements 9.0/9.0.1 and elements 13/13.1 first.

  These programs do not seem to share/use the same built in programming of the export. And, further, you say that there is this audio desynchronization if burn disk or export the file to one of these versions at this time. Is this correct?

  Even if the problem is not manifest prior to export, which has been described above point to the project file. Have you changed anything in the project settings or export settings in this file of project for good time / wrong time - courses of transitions, component files software plug-in, flow? And you say that look very detailed to the timeline, the content of this one project has revealed no change before and now after? You write

  Would such a program have changed or are damaged?

  From what I just wrote, could the project file has been corrupted, but...

  If you want to look at this as a corruption of program, then you will need to take uninstall, cleaning, reinstall to 9.0/9.0.1 and 13 to dismiss this idea and replace any missing files of exporting program. But, once again, we are dealing with a single project or all your projects with this problem.

  Please consider.

  Thank you.

  RTA

• Problem with the sync audio with audio 48000 hz camera with back of 44100 hz? Need help any suggestions?

  I recently did a project and recorded my video with 48000 hz and then accidentally recorded my audio with 44100 hz lapel mic. Now, I need to synchronize the two together but seems impossible? What should I do?

  I tried to convert the audio in audacity to 48000, but this did not help why is audio desynchronization and how to fix this?

  As pointed out already, the sync problem has nothing to do with 48 k against 44.1 k and everything to do with the fact that the timing of audio recorders is a little sloppier than VCRs. Both camcorders will match very well and can derive only one or two images in two hours, if at all, from my experience with multi-camera shoots.

  You can either speed up the clip a little bit, or put a razor cut in the audio clip from time to time and change the next piece of audio on a frame or two to maintain the necessary synchronization. Tedious work.

  Thank you

  Jeff

• AAC compression crashing export / export audio glitching

  Hello

  I'm working on a Windows 7 PC, 3.4 AMD Phenom II X 4 965 processor, 8 GB of RAM.

  I am running the latest version of the CS6 first. When I run an update of Adobe, there is no new update for the Prime Minister.

  I have a problem to export when you are using the AAC audio compression. During its use, export often completely fails with an "unknown error".

  and if she does not export I get a glitch, audio desynchronization.

  Change the audio codec solves this problem. However, I want to use AAC is the format most widely accepted with a compression well.

  Help, please!

  MPEG4 "Match sequence settings" works fine, but I'm sure he uses an uncompressed audio format.

  It seems that there is a bug when exporting as H264 with AAC.

  Thanks for your help!

• Image frequency constant filmic creation Pro

  Hello

  I don't see an option for a constant rate.

  1. How can I configure it constant?

  2 is it automatically constant or variable in its new version of the app?

  3 and/or the real question: what is the fast solution for sending video from my iphone 6 to Premiere Pro so that audio and video are in sync?

  I have lived these forums and there are a lot of answers, but none that have managed to solve my problem. Here's what I did.

  I have the latest version of Pro-filmic. I shot the video with dorsal pro, it has exported to the camera of my iphone and then my computer via "image capture". When I imported into Premiere Pro, the audio and video are out of sync, which was the reason I got the app in the first place.

  Looking through these forums, a recurring theme is the constant/variable rate.

  (The only time where what I tried to convert to constant with the brake hand, he did a huge file and it was virtually unusable because he stopped and started once I imported for the first, outside that it changed the size of the image and there is no way to set the presets for 16:9)

  So now I see a post that says I have to set the constant cadence on film Pro, but I can't find an option to do so.

  If you can solve this problem, I will love you forever.

  Thanks in advance,

  Lucas

  Hi Lucas:

  I would like the chip as a film Pro user who has experienced the same problem with the audio desynchronization when imported into Adobe Premiere here. For your information, I use an iPhone 6 and Premiere CS6.

  Now, it is my understanding that all of the videos from an iPhone is a variable rate. Since film Pro is an iPhone application, therefore, there is no way to put it at a constant rate. In General, when you buy a real camera and recording 24 fps or 30 fps, it is exactly what you found, and that's exactly what Premiere Pro see. On the other hand, with iPhone videos, 24 fps is actually 24.02 and 30 frames per second is 30.02 and so on and so forth. This is the Premiere Pro has a hard time keeping things in sync.

  Note that most of the people have no problem with film images Pro audio sync when using Final Cut Pro as their editing program. It seems that Premiere Pro just don't like variable pace, never and will probably never. Therefore, a solution for you may be to use Final Cut Pro instead of Adobe Premiere.

  On a side note, know that when you save your Pro film images in the camera roll on your iPhone it is a bit compressed. Best practices to avoid any compression of the GET go is to connect your iPhone to your computer, choose iTunes and select your device, select 'apps' and scroll down to the filmic app Pro where you can then select your videos and save them on your computer without any compression. It's just a side note, though, and obviously, you are free to continue to import your images as you did if you don't mind to spend a little compression of the EEG.

  Now for the big question! How to turn Pro-filmic images in a constant rate so that it is usable and not out of sync in Premiere Pro? The answer is handbrake.

  I know you mentioned trying the handbrake only once, get a huge file and it was the bad resolution to start. Personally, I think that the problem is that you gave up too early and has not taken the trouble to learn how to properly use the hand brake.

  Using the brake to hand:

  1. you need to import your file, or the files or folder containing the files.
  2. in the column on the very good, under the title "regular", you can select "high level" If you want a level of codec H.264 4.1 rather than the default level of 4.0 H.264 codec. And very important, do not select a preset under "devices." For example, if you select 'iphone & iPod touch', you will notice the tab 'Picture' the width of your video goes from 1920 to 960. It's probably how you ended up with a video that was not 16:9.

  3. in the 'Image' tab, there is nothing to change, leave it as what. Unless you want to crop your video, or reduce the resolution of your video (from 1920 x 1080 to 1280 x 1080). But as I say, there is nothing to change here since these are things you would do in Premiere Pro in any case (cropping, exporting in lower resolution, etc..)

  4. as a general rule, there is nothing to be changed on the "Audio" tab, "Subtitles" or "Chapters". Leave it as what.

  5. the 'Video' tab is where you want to make changes, but only in one or two areas. (A) you will want to choose "Constant Framerate" instead of "Framerate Variable". And (B) If you wish, you can play with 'constant quality' under the heading 'quality '. As a general rule, you can leave this default setting of consistent quality intact: 20. There is no need of constant quality: 0 (Placebo quality) that it will increase your file size only boggles the mind without necessarily improving the quality of your video. My general recommendation is something between 20 and 10 for consistent quality. And, with this, you should actually get by with a size of the video that is slightly smaller than the original without actually losing quality.

  For example, my original film Pro 1920 x 1080 video has 370 MB. Once I ran through the handbrake in constant quality: 20, it was 80 MB. And, once I ran through the handbrake in constant quality: 10, it is 114MB.

  In addition, the resolution remained the same (1920 x 1080 or 16:9) because I did not any changes on the tab 'image' (size or cropping) and I select a preset in the column to the right. Yet once, just leave things as they are. Handbrake will keep the same resolution as your video source unless you begin to select the presets and changing sizes and other things. Yet once, everything you need to really make select your file, pass the value of the Variable in constant under the 'video' tab and export it (Start button).

  Now, a few notes: it seems that the issue of the audio sync is more serious or more frequent during the longest video short video vs (10 minutes against 1 minute). Also, it seems more widespread when shooting at 24 fps instead of 30 frames per second.

  If all goes well, you can try good brake hand and have some success with your cinematic sequences Pro video editing in Premiere Pro. Feel free to let me know if you have any questions.

  See you soon and good luck. :))

  Jade.

• problems with quality vs. file size in export to YouTube 1080 p

  Hello

  I used to use NCH videopad as a Publisher began. He had shocking performance but gives really good quality and small size files.

  That is to say, I could export 1080 p 30 min video of good quality for YouTube in less than 2 GB file size, but Premiere Elements can

  Get anywhere near the same quality, even at 4 GB.

  So what I need is someone to tell me the parameters I need.

  Currently I export the shadowplay film recorded in 1080 60 fps 50Mbits (according to shadowplay).

  If I export to AVCH (whatever) with YouTube Widescreen HD - set it to match the source, I can't

  get a good quality. I even put the target at 20 and the other at 18 and it is still grainy quality and file sizes

  4 GB. The only way I can get the same quality I received of Videopad is with a 7 GB file into elements.

  Today I tried to export a video (30 minutes) and all day trying to find a good setting, and

  each parameter gets me grainy footage.

  If someone can you please just give me the detailed settings, I need (without the jargon) please.

  The problem is with file sizes as what he deletes my additions to my half a string because

  limits on usage of my data.

  Thank you

  NeonsStyle

  corn

  I think that you need to remove temporarily and advanced then refreshed. Then go through the following.

  The first link in your last message does not, but that a second was full of information (really great).

  If this is supposed to represent the output of VideoPad, here's the story.

  1. you have an AVCHD.mp4 file MPEG2.mpg is not. The file is 1920 x 1080 @ a progressive frame.

  2. our goal is progressive rate - variable and not constant, noted that the 3 frames rate in playback of video properties...

  minimum frame rate = 10,000 frames per second

  frame rate = 29,888 frames per second

  maximum frame rate = 30,000 images per second

  First Elements not managed well with the video recorded with a variable rather than a constant rate. Symptoms range from Premiere Elements of audio desynchronization to not being able to import the video at all. The typical remedy is to take video in the free program of brake hand to get the H.264.mp4 with constant frame rate (29.97) model. Then, you take the export of brake hand in Premiere Elements project using first elements add Media/files and folders.

  https://handbrake.fr/

  Also note that VideoPad product export with a low flow, i.e. 7759 Kbps (equivalent to 7.7 Mbps). You were trying for 36 / 50 Mbps in the export of Premiere Elements. It is an explanation of the difference in size of the files that run you in your comparisons of software.

  Since you don't seem to be involved with video MPEG2.mpg, I write what follows for information purposes... What do you do with an xml file if you used the 1080p29.97 HDTV high quality predefined with Publish + share/computer/MPEG? You should get a single file, MPEG2.mpg. If you use one of the presets whose name begins with MPEG2 (interlaced preset who is not progressive), then you will get two files, the video file and a file of information m2t.xmlses. Nothing to do with the xml file. All you want is the video file that will be MPEG2.m2t.

  Right now I'd take that video in Handbrake for 1920 x 1080p29.97, like H.264.mp4, import this file in Premiere Elements, export as a AVCHD.mp4 MP4 H.264 1920 x 1080 p 30, get a core file line with default transmission speeds and, if necessary, start to lower the bitrate to 8 Mbit / s by looking at the quality.

  Please consider.

  Thank you.

  RTA

  Add on... If you need a how tos tos for handbrake, let me know. It is quick and easy with the adjustment under video tab key.

• CC overwhelming 2015, Exception code: 0xc0000005

  First CC 2015, 8.1 Windows 64, 32 GB of RAM, Quadro 6000.

  First blocks every 5 minutes, sometimes more often. Looks like he struggles to play as the video windows froze first and it is always possible to say, but who knows. Sometimes it gives errors audio desynchronization. I tried to watch that to the top of violin with devices but not availability. This also happens on another machine.

  I've converted all the sequences of intermediate codecs and anyway it used to work before.

  Here is the screenshot of a typical mistake:

  

  OK, the official support people advise to roll back to 2014 saying 2015 was beset with problems.

• Ripple trim edition next to playhead BUG?

  Hello...

  I programmed this specific keyboard shortcut. Only my main video track is selected. The audio track is NOT.

  Whenever I hit that shortcut function works, but he will cut all of the tracks on the timeline incl. the Audio.

  I have to lock all the tracks I want not affected...

  Is it the way it is supposed to work? or is this a bug?

  AtonMusic wrote:

  Hello...

  I programmed this specific keyboard shortcut. Only my main video track is selected. The audio track is NOT.

  Whenever I hit that shortcut function works, but he will cut all of the tracks on the timeline incl. the Audio.

  I have to lock all the tracks I want not affected...

  Is it the way it is supposed to work? or is this a bug?

  Yes, that's the way it works. If you could do what you wanted, you would throw the audio desynchronization. If you lock audio, then try the command again, you will see this result.

  You can easily cut to the video in the playback head, but not ripple trim. Target just video only and invoke the shortcut.

• Media Center of the video window - serious on dvd has audio/video desynchronization

  Whenever I try to burn recorded videos on a dvd using Windows Media Center, the video and audio are always synchronized when DVDs are read. I tried several times and still the same problem experiece. I have no problem with any aspect of the Media Center and all other DVDs play fine on my PC, so I guess that something goes wrong during the burn process.

  Any ideas what can cause this problem and how to fix it?

  Hello
   
  Thank you for visiting Microsoft Answers.

  Could you please let us know how you try to burn to dvd?
  You use any 3rd party dvd burning software?

  There is possibility that this problem can be caused because of the drivers.
  I suggest you to update the drivers for the video, sound and TV tuners adapters and verify.
  Steps to uninstall the sound, Tuner and video drivers.
  NOTE: You will need to do one thing at a time.
  Uninstall and reinstall the drivers on the computer.
  1. open the programs and features.
  2. check if the device driver is listed.
  If this is the case, then right click on the device that is listed and click on uninstall, then Yes to confirm.
  NOTE: Sometimes you will get a notice to restart the computer to finish uninstalling the driver. If you do, then click Yes to restart the computer when you are prompted.
  3. close the programs and features.
   
  Uninstall using Device Manager
  1. open the control panel (Classic view).
  2. click on the Device Manager icon.
  3. click on continue for UAC prompt.
  4. click on the + sign next to the device you want to uninstall to develop.
  5. right click on the listed device, and then click Properties.
  NOTE: You can also click on uninstall
  6. If you want to uninstall the device-
  NOTE: This doesn't uninstall the device and let the device driver installed for the device.
  (A) uncheck the button remove the software driver of this box of the device.
  NOTE: If you do not have this option, then only the device is uninstalled.
  (B) click OK.
  NOTE: Sometimes, you may be asked to restart the computer to finish uninstalling the driver. If you do, then click Yes to restart the computer.
  7. close Device Manager, and then restart the computer. Uninstall and reinstall the back of the computer.
   
  Alternatively, you can try to perform the scan of the file system [SFC] checker on the computer.
  1. click on the Start button
  2. on the Start Menu, click all programs followed by accessories
  3. in the menu accessories, right-click on command line option
  4. in the drop-down menu that appears, click the "Run as Administrator" option
  5 If you have the enabled User Account Control (UAC) you will be asked to consent to the opening of the command line. You simply press the button continue if you are the administrator or insert password etc.
  6. in the command prompt window, type: sfc/scannow then press enter
  7. a message is displayed to indicate that "the analysis of the system will start.
  8. be patient because the analysis may take some time
  9. If all the files need replace SFC will replace them. You may be asked to insert your Vista DVD for this process to continue
  10. If all goes although you should, after the analysis, see the following message "Windows resource protection not found any breach of integrity.
  11 after the scan finished, close the command prompt window reboot the computer and check.

  If you have installed any 3rd codec part on the computer, try to uninstall and reinstall and check.

  It will be useful.
   
  Kind regards

  Niranjan
  Microsoft Answers Support Engineer
  Visit our Microsoft answers feedback Forum and let us know what you think.

• Importing quicktime in CS6. Audio/video desynchronization

  Having trouble with the .mov files in first pro cs6. Once I imported my video, I drag the down to 'New element' to ensure the parameters matching the clip... during playback, the video looks very good at the beginning but audio begins to lag and finally totally ends up out of sync with the video. Any idea?

  Working on a Mac OS X Version 10.7.5

  2 GHz Intel Core i7 processor

  Videos were recorded on Macbook Pro camera photo of the customer and sent via Dropbox.com.

  Problem most likely is a variable rate, as it has been registered with Apple hardware

  Some people find that video of Apple (iphone, etc.) will not be easily edit because it uses a variable rate

  -A possible solution in the message #22 http://forums.adobe.com/thread/934466

• I just updated my elements14 first, but something is wrong: video is not stable and audio is out of sync.

  The same file is ok when I open it with VLC. I use an ASUS laptop. Already rebooted after updating. Can anyone help?

  eugeniof

  Not sure if your video was recorded with a variable rate without more information.

  1. what operating system for your components 14/14.1 first?

  2. what camera or device recorded video? If a mobile phone, iPad, iPhone, or one of these screen capture programs, it is most likely that you have a variable rate for your video. Premiere Elements has problem with this type of video. The symptoms of this beach of situation of desynchronization of audio to not be able to import the video at all. The typical solution into your video HandBrake for the H.264.mp4 with the version of constant frame rate and put in Premiere Elements project.

  3. you have two approaches to this issue of variable frame rate...

  a. before you think about hand brake, hold the program playback of video and audio of MediaInfo properties to determine if your video has 3 instead of 1 frame rate in video on the video display. If 3, then go ahead with the variable of Handbrake at the session of rate constant frame

  or

  b. do not bother with MediaInfo reading, just take the video into a brake hand, get your H.264.mp4 with constant cadence. If it works, OK - happy with the solution and assuming that this variable image has been the cause of the problem.

  In addition, make sure the project is set up correctly, with the properties of the media source corresponding to the preset of the project.

  See Edit project settings switchboard to check the settings of the project especially if the project ones automatically.

  A lot of things to consider.

  Please consider. If you need additional information, feel free to ask.

  Thank you.

  RTA

• Can you change to Audio time units (: 00000) as used in first?

  I know that 1 unit of time Audio in first is 10 nano-seconds, and hearing seems to be limited to (: 000), which would make it useless for me, and it seems a bit strange that the video editing software would be a system of far superior audio time units.

  kyrtin wrote:

  ... and I don't know exactly how the digital files are processed after the changes are made to this level, but my readings have confirmed a significant change in the reaction of the user between 100, 130, 200, 350 nanoseconds.

  I'm sorry, but just, you have demonstrated that you have confirmed nothing of the sort. If you do not understand what you measure and how it is treated, you can simply make claims like that. As ryclark says, you cannot make changes in the range nS at all - the time between samples (which is indivisible with regard to the results of reproduction) supports it completely.

  Well, you made me double check my work, I'll give you that, but everything I read points to get me right.  The sampling frequency is something that occurs at a fixed interval for the left and right signals at the same time, and then the signal is sent to any gear, producing the actual sound.  If changes made to the audio were limited to a value by changing the value of B, then back to a value between samples, Yes, you would be entitled, but since they a sampling of desynchronization two waves then left and good values in the same sample are changed, however small the change, because the wave is in constant motion , and you effectively has changed the point of being sampled by adjusting a side a few nanoseconds in one direction.  The output could be simplified for the sake of sound reproduction, but even if the waveform is also simplified to match the output before as I have desynchronized it on the scale of the nanosecond it would still create a difference of values between left and right by changing the points sampled on the simplified waveform.  If L is displaced 200 nanoseconds in one direction, and it is changing the pitch and volume (assuming that both sides put match in first), it is sampled at a slightly different point on the same curve as the R signal.

  The human ear (on average) is only able to save minimum mismatch of 100 nanoseconds

  All research claiming to demonstrate that this is going to be wrong. It is not easily possible without spending a fortune for generating independent signals which can be separated for that small degree. There is no current digital system that can do it, as noted by ryclark. And anyway, the research which shows that the ear is capable of and the Haas effect, show how easily the ear can be fooled. I suggest that get you your hands on a copy of the acoustics and psychoacoustics and carefully read Chapter 2...

  100 nanoseconds, which I quoted came from someone else's work and I have not personally tested still below this level, but I don't want that I don't take it as gospel just because someone said.  The last tech Conference that I spoke was a man, which suggests a very low-tech solution to this question when he has misunderstood me and thought I was talking exactly 1 nanosecond instead of a scale of nanoseconds, which is simply precisely measured wiring in order to establish the time of signal caused by the speed of electricity.

  Also if 192 khz = 4ms intervals then 5 644 800 DSD Hz Double rates would be equal to 136 nanosecond intervals, useful for testing, but not so much for music at a rate of 1.  Thus the minimum 100 nanoseconds can be proven warp in such a system, or with the method above for a delay of mechanical signals as opposed to a digital delay.

  I should have clarified that the lock of 100 nanoseconds was not my work, and if it does not exist there are has a wall that I've not hit again, but at the same time I see it as quite possible to prove or disprove.

  It went quickly off topic however, and now, my friends recommend I just start learning Pro Tools instead of sticking to my adobe software.  Time to see how close a thread on this.

• Why my video's audio is out of sync in Adobe Premiere Elements?

  When I put my video in Adobe Premiere Elements, audio of the video is about 1.5 seconds at the end I contacted 6 reps and have had no help from Adobe support.

  Granuke

  What version of Premiere Elements and on what operating system works - it?

  The audio not synchronized with the video after timeline becomes the content of the timeline?

  What are the properties of your source file? And, above all, where is the from file-camcorder, mobile phone, iPhone, or other. Is the device that records video using a variable instead of a constant rate? If so, be aware that Premiere Elements (many versions) do not work well with the sources files that are saved with a variable frequency. Range of problems of desynchronization of audio should not be able to import the file at all. In these cases, the solution was to take the file in the free program of brake hand to get a version of H.264.mp4 with a constant, rather than the variable, the cadence. And then import this version in the Premiere Elements project.

  https://handbrake.fr/

  Please review, study and give more details. Then we can decide on what was then based on details in your response.

  Thank you.

  RTA