Why do the MP4 files that I import to Premiere Pro CC have unsynced audio? (Resolved)

I have identified and resolved.the issue. There is a bug with how Premeire Pro handles importing videos with variable frame rate.
Community Memeber Walter.Johnson found a work-around at the bottum of this post, which also has the identification and submission of the bug itself:
http://forums.adobe.com/thread/1110005?start=40&tstart=0
I had to convert the video with "constant framerate" selected in handbrake. I'm believe the ffmpeg CLI equivilant switch is "-cfr" but I have not tested to be sure.
I can now import videos with synced audio!
I have recorded several hours of footage using a program called XSplit (a screen recording tool).
The files are recorded in a FLV format and I then convert them to MP4 as premiere pro cant read then in FLV.
In a MP4 format I can import the files into Premiere Pro CC and the video looks perfect, but the audio is unsynced. It is also unsynced in non-linear way so it is not something that I can simply unlink and adjust to compensate as it would have to be done manually every minute.
If I import these same MP4s into other video editing programs they import perfectly fine and have no audio sync issues what-so-ever. I only experience this issue in Premeire Pro CC. I can even tested these videos in 6 different media players and they play perfecly fine.
If I convert the files to AVI using ffmpeg or ffmpeg assisted tools it will not import into Premiere Pro CC and gives a "unsupported format or damaged file" error. Once again, this avi can be played and edited in several other programs no problem.
Here are the details about one of these files:
VIdeo Codec: H.264/MPEG-4 AVC
Video: 1280x720
Audio Codec: mp4a: MPEG-4 ACC LC
Audio: 44100hz 63 kb/s tot , stereo (2/0)
Anyone have any ideas on why the audio is becomming de-synced in Premiere Pro CC only?

I'm happy to announce to you all that my "mp4 importing" issues has been sorted out. Now I import mp4 shot with the same Windows Phone 8 Device into Adobe Premiere Pro CS4. Only that for the moment, it doesn't play as fast as with ordinary player.
But how did I get it to work, you may wonder;
I simply installed Itunes on the system, I also installed an app called media monkey. I can't say which of the apps did the magic but the next time I tried to import mp4 files into Premiere Pro after these installations, it imported seamlessly.
Obviously there's a link between the required codecs and the itunes itself.
You may want to try it and hope it works for you.
Kindly inform us if it works.
Thank you all.
Cheers.

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Wow! A lot of ifs, ands, and maybes here.
I'm trying to edit some .mp4 movie files, but I can't open them in Quicktime (10.0 or 7.6.6), or iMovie '09 (8.0.6) or Final Cut Express (4.0.1). I've got a MacBook Pro running OS X 10.6.8 (Snow Leopard). When I try to open the file in QT 10, it says "The document “name.mp4” could not be opened"; whereas in QT 7 it says "The file could not be opened. An invalid sample description was found in the movie." In iMovie, the file is greyed out when I try to import it.
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The file will open and play fine in VLC, but I can't do the editing I want there. The Media Information pane in VLC says: the codec is "H264 - MPEG-4 AVC (part 10)(avc1)", it is HD resolution (1920 x 1080), it has a frame rate of 59.940060, and the Decoded format is "Planar 4:2:0 YUV". It also has an audio track (MPEG audio) and a subtitle track. I also tried opening these .mp4 files on two Mac laptops that a friend of mine has. Interestingly, they would not open on one (I think running Lion with QT 10.0), but they DID open on the other newer laptop (running Mountain Lion with QT 10.2).
In the future, could you be more specific when describing the file contents. For the moment, I will assume the video is H.264 (MPEG-4/AVC) and the audio is AAC (MPEG-4) audio and not MPEG-1 layered audio. (I.e., while the former is to be expected with the MP4 file extension, some apps can "stuff" incompatible data into an MP4 container or users can manually change the file extemsion.) It also important to know if the "subtitle" track is embedded within the file or is contained in a separate file. (I.e., a screen capture of the media "info", "inspector", or "properties" window is usually the least ambiguous way to track content information.) It would also be nice to know if the VLC frame rate is for progressive or interlaced video if possible.
Basically, some apps are very touchy about file extensions and track content. iMovie '08, for instance, will not open a file containing extraneous tracks like 'tween, text, chapter, etc. embedded within the file. I assume this may also be true for "subtitle" tracks as far as your Snow Leopard players are concerned. In any case, if your version of the QT 7 player is keyed for "pro" use, I would perform a simple test here by deleting the "subtitle" track, saving the file, and then re-trying to load, open, play, and/or import the file in the various applications currently giving you problems. If this fixes the problem, then you will know the source and solution of your problem
I first assumed it was just a case of not having the right codec. So I tried copying all the codecs from the Mac laptop that *could* open them, but that didn't work. Then I searched for and downloaded codecs that I might be missing, such as "avc1Decoder.dmg" from MyCometG3 and http://www.macupdate.com/app/mac/23875/avc1decoder, and x264Encoder 1.2.27 also from MyCometG3, and I put them in my Library/Quicktime folder and restarted Quicktime, but neither solved the problem. I also tried opening the .mp4 files in MPEG Streamclip (1.9.2), but it says "File open error: unrecognized file type". When I tell it to "open anyway" it tries and then says "File open error: can't find video or audio tracks".
The indiscriminant installation of additional codecs often creates more problems than it solves owing to the logrithmic increased potential for the introduction of QT codec component conflicts. The normal "rule of thumb" here is to identify a missing codec and to then install only that specific codec component. Even then, there is a possibility that there may be a conflict but at least it is more easily identified so you can better evaluate which of the conflicting codecs to leave installed and which to swap only when needed/required. As to the use of MPEG Streamclip, it basically uses your system's QT component configuration of access of most codecs as opposed to VLC and HandBrake which contain their own, built-in codec support. So if QT is having a problem, it is often likely that MPEG Streamclip will also have problems.
I tried opening one of these .mp4 files in Handbrake (0.9.8) and it was able to open and convert the file to an .mp4 that is then openable in QT 10 with a format of H.264, AAC, and a reduced frame rate of 29.84. However, this doesn't seem like a good solution because it takes about 2 hours to convert a file with 30 minutes of video. I just want to be able to trim these big files down to some short video clips that are in an accessible format.
The HandBrake workflow forces a recompressing of the file data which is why it takse so long. That is why I suggested you try deleting any extraneous data tracks found in the source MP4 file container using QT 7 Pro and then use the "Save" or "Save As..." option to re-write the original audio and video data to a new MOV file container which takes much less time.
Am I missing the right codec? Or, as I'm beginning to wonder, is this format one that is too demanding for OS 10.6.8 and QT 10 and they just cannot handle it no matter what codecs I have on my computer (because of the 60 fps frame rate? Or is it the subtitle track?). Or is the solution to upgrade my operating system to Mountain Lion (10.8) and QT 10.2? My 15" MacBook Pro is about 2 years old with a 2.66 GHz Intel Core i7 and 4 GB of RAM (1067 MHz DDR3).
Probably not. The VLC reported data rate may either indicate the MP4 content is AVCHD/BD sourced or it is reading interlaced content as progressive which I have noted it can do on occasion when I compare the media info as read by various different apps and/or utilities. Since you indicate the file opens in Mountain Lion, my guess would be that your MP4 content is actually AVCHD/BD sourced since such support was only recently added to Mac OS X v10.8 software. As to moving up to Mountain Lion, as always, that is something you would have to evaluate for yourself. For instance, do you require PNG compression for video content? By default you would lose it under Mountain Lion and have to re-enable it manually if needed. Are there other pros and cons that you need to consider before upgrading to Mountain Lion? These are the types of questions and compatibility issues that only you can answer for yourself.

Why do the MP4 files that I import to Premiere Pro CC have unsynced audio? (Resolved)

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