Sample rate/quicktime pro audio/video

Hi all:
Have a few questions related to Quicktime pro on mac related to sample rate of audio and video...any help understanding much appreciated...
I am a music composer using logic pro and recently started working with filmakers who send me quicktime files of the video to score to...
regarding sample rate of audio as played back in quicktime...I'm a bit confused....
When playing back either an MP3,wave,Aiff at 44.1k or 48k
seems that quicktime plays at the right speed and pitch of audio...Does Quicktime use it's own audio processor to convert sample rates in real time at playback?
When I play a video track with audio recorded at 44.1k or even an MP3...and playback on my soundcard set at 48k...it does play at correct pitch...even though theory of audio tells me that the sample rate is very inportant especially when playing back...sample rate needs to be the same on both the soundcard audio clock and the software...
Is this part of the magic of quicktime or am I missing something.
Even a bit more confused when I got a dialog file from a filmaker attached to his quicktime file that he thougnt was in 44.1k...was actually 48k...so when taken out of quicktime and put in another enviornment for editing that became really important and avident that the samplerate audio rules outside of quicktime applied...
Am I correct then in my understanding that when working only in the quicktime enviornment that the rules of audio sample rate do not apply?
Thanks for thoughts...
regards
vibes

All you may ever want to know about QT, audio and OS X:
http://developer.apple.com/documentation/MusicAudio/Reference/CoreAudio/index.ht ml
QuickTime 7 is a major re-write and it now has many more options for audio. Multiple channel support (up to 24) and sample rates of double DV Stream settings.
Magic is how it works.

Similar Messages

  • Project sample rate vs the audio interface clock

    I used Audition for digitizing archival audio and I mostly work in 96 kHz because it's the current archival standard for analog audio, however I occasionally need to transfer DAT or ADAT tapes at 44.1 or 48 kHz. One thing I noticed when I went to change the project format was that my audio interface clock did not change and match the multitrack settings. I was able to change the clock manually but I had to go to the Audio Hardware preferences.
    I find this behavior for a DAW very strange. If I have a multitrack open of one bit rate and my clock set to another, how does that work? How does Audition 6 play and record audio at differnt sample rates than the interface clock? When I open a multitrack that's 96 kHz and my clock is set to 48, what sample rate am I getting? The audio file being saved says 96 kHz but is it?
    Audition 6
    RME Fireface UCX
    Mac Pro mid-2010

    loneraver1 wrote:
    If true, this is indeed strange. I have used just about every DAW under the sun for the last 10 years based on what my employer purchased and I have never seen a DAW allow you to record sample rates where the project didn't match the incoming clock.
    There should be an option that locks the audio interface internal clock to the opened project. It makes it annoying any time I have to switch between recording in 96 kHz to 48 kHz. That's annoying on it's own right, but what's really annoying is that it's an extra step that I have to train our archival technicians who don't have a techical background in audio.
    I can definitely say it's true for my set-up!
    Surely, the "extra step" you refer to is not necessary if AA is resampling the audio to match the desired sample rate?
    As for the "option" to "lock the audio interface clock to the opened project", for those cards, like mine, which cannot have their sample rate changed by the audio software, how is that going to work?  I suspect this was how AA CS5.5 and earlier worked: unless session/project and interface sample rate matched, no audio.  I much prefer the current "resampling" method; no necessity to have to think about soundcard/interface settings every time a different sample rate is being used.
    FWIW, if I want to record something at 44.1 I always ensure the card and AA settings are 44.1; but for "playback" (or video editing which I do quite a lot of and which requires 48 - my video editor software will not "play" unless the audio sampling rate of the card is 48 - ) 48 is my "default" setting.
    JMO!

  • Sample rate off the audio input and out devices do not match - what to do?

    This is fundamental, I know, but nevertheless I can't find my way around it. I get this error message when trying to recor:
    Sample rate off the audio input and out devices do not match
    and am asked to do this:
    Use the appropriate operating system or audio device control panel to adjust the sample rates of the input and output devices to use the same settingt.
    I have defined the sample rate to 44.1/16 bit in accordance with my inbuild soundcardt.
    I am trying to record from LineIn.
    When running on a M-Audio sound card I don't face any problems.
    HP 8560W, sound card IDT/High definition audio Codec
    Any suggestions?
    Knud
    Copenhagen

    You're sure you have set BOTH the input and output settings to 44.1 16 bit?
    Which version of Windows are you running?  There are a number of posts on this forum about how to fully access both the Windows Mixer and the Mixer for your soundcard.  Especially, you need to ensure that all "Windows Sounds" are turned OFF.

  • Quicktime pro recording video playback too fast

    I'm using Quicktime Pro to make a video recording with audio using the "Best" settings in the preferences (i.e. h264 encoding). When playing these videos back, the audio sounds good, but the video framerate seems almost x2 the speed as it should be. Below is the output of ffmpeg on one such movie. The output points to the fact that there's a problem with framerates, but I'm not really sure how to interpret it towards getting a solution. Any ideas on how to fix this so that we get audio video sync'd up and at the right speed?
    $ ffmpeg -i 1226187784.mov
    FFmpeg version SVN-r15792, Copyright (c) 2000-2008 Fabrice Bellard, et al.
    configuration:
    libavutil 49.12. 0 / 49.12. 0
    libavcodec 52. 3. 0 / 52. 3. 0
    libavformat 52.23. 1 / 52.23. 1
    libavdevice 52. 1. 0 / 52. 1. 0
    built on Nov 8 2008 00:16:13, gcc: 4.3.0 20080428 (Red Hat 4.3.0-8)
    [mov,mp4,m4a,3gp,3g2,mj2 @ 0x15bd550]edit list not starting at 0, a/v desync might occur, patch welcome
    Seems stream 0 codec frame rate differs from container frame rate: 30000.00 (30000/1) -> 29.97 (30000/1001)
    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1226187784.mov':
    Duration: 00:01:01.57, start: 0.000000, bitrate: 1759 kb/s
    Stream #0.0(eng): Video: h264, yuv420p, 640x480, 29.97 tb(r)
    Stream #0.1(eng): Audio: aac, 44100 Hz, stereo, s16
    Must supply at least one output file

    Hello,
    I think it has something to do with audio settings in your camera.
    There's a menu where you can choose 12bits audio or 16bits audio.
    Change the setting and try again.
    Regards, BJ

  • QuickTime Pro audio exporting error - help please!

    So I've got Perian installed to read 1080p HD movies and I opened up .mkv files in QuickTime Pro and allowed it to read the files into memory (let the grey bar go for a few minutes).  Once that was done, I wanted to export the DTS 5.1 surround sound audio track to .AIF format and do a pass through encoding of the video only.  After this, I use MAX to convert the .AIF file into an AC3 file which I add back into the video only to create the final .mp4 file with 5.1 sound.  I've done this successfully before and I prefer this method to downconverting the 5.1 audio into stereo sound when converting the .mkv to .mp4.  This time however, QuickTime Pro miserably failed.  I have Avatar in 1080p and The Lord of the Rings trilogy in 1080p as well and I wanted to convert them to .mp4 the same way I've done before.  All of them failed with the same error.  When I tried to export the audio, I believe it said, "qtKiterrorcatchall (-1309)" and it failed.  It said this for all of the videos and strangely enough, it worked great with another .mkv movie I had perfectly with audio and video tracks in the same formats.  Does anyone know how I can fix this and export the audio track so I can preserve the surround sound and put it back into the .mp4 video file? Many thanks...

    I'm having the same problem. Were you able to get an response or and answer to this problem? Thanks

  • QuickTime Pro audio sync problems

    Hi, when I edit my videos in QuickTime Pro, the more I cut sections out from a video, the more the audio is out of sync from the video as it progresses; so at the start it is fine and in sync, but at the end the video and audio is not in sync at all. The video is fine before I start editing with no sync problems, it's only when i cut parts out. How can I get around this problem?
    Thanks

    ok, I output a lot of footage using quicktime conversion so I can edit in after effects or output for the web. I usually use the animation or h264 codec but the problem still persists regardless of which codec I use. < </div>
    If the relationship between the tracks does not change over the length of the clip, that is, the audio doesn't drift more, your clip's tracks are actually in sync. One of the tracks, video or audio, has been set to start sooner or later than the other. I have no idea how that can happen, sorry, but I'm going to suggest the solution is going to be much less complicated than you might think: it's going to be a simple user error. We all have them.
    It's a binary search, then, no way to shortcut it.
    You try to find a good export and figure out what's different between a good one and a bad one.
    Hope you get better advice on how to debug it.
    bogiesan

  • Quicktime Pro audio synchronization problem when recording

    My hardware is an Intel Based Macbook Pro with the latest Quicktime Pro S/W.
    I have just upgraded to Quicktime Pro and I am trying to record video from a DV source (Canon camera acting in AV in/DV out mode). The problem I am experiencing is that the video and audio are out of sync by around 1 second, th sound seems to be in advance of the video.
    Are there any setting which will affect this?
    Has anyone been able to solve a similar problem?

    I don't know what causes the problem, but I can give you a way to solve it:
    Open your DV file with latest version 3.0 of SimpleMovieX and open the tools panel, go to Audio, and resynchronize it.
    The do save, either as mov or reexport as dv format, depending on your workflow.
    Website to download:
    http://www.aeroquartet.com/
    Note: I'm the developer of this app.
    Regards, BJ

  • Can anyone help with Quicktime Pro audio prob?

    I've been trying to compress an audio/video file shot on my Cybershot so that I can upload on a contest website. Every time I copy into I-Movie, I have no audio (although it plays fine on my desktop). I was told I-Movie does not support muxed streaming. At Apple's recommendation, I upgraded to Quicktime Pro.
    The audio and video both work fine when I play it in Quicktime Pro; but when I export it from Quicktime to either MPEG4 or Quicktime Movie, I get no audio. (Also, the audio setting area is grayed out.) Any suggestions? I need to send the file 320X240 around 15 mb by midnight tonight.
    Thanks for the help...

    Use the "Export to DV" option. (Any of the sub options will work.) Split into segments if needed for older versions of iMovie.

  • LogicX - Maverick - Sample Rate issue with Audio Interface

    As a test prior to updating my Mac Pro and iMac, I loaded ML so I could test out LogicX.  I've been running Logic 9 either using the built in audio or a Line6 guitar Port.  The MBP is a late 2009, non retina, 13 in with 4 GB Ram.  As compared to my iMac, the laptop can barely play back my tracks which are mostly software instruments (I don't record audio until the midi arrangements are finalized). 
    So, I updated to ML to try out X and of course, had to deal with the 32 bit plugin issue.  Luckily, 32 Lives and Vienna helped out with 90% of my plugins.
    Now, I updated to MAV and had to go through an arduous process of re validating the AU plugins for both Logic 9 and X.
    After doing so, I loaded up a song that did have a single bass audio track.  I updated the Guitar Port driver from Line 6 to the latest driver.  The song will start, but then I get a stuttering and an error message about running the audio at a weird sample rate, eg 28654.  I tried using the built in audio and same issue.
    I opened the song in Logic 9 and it works.
    Any suggestions?  Do you think one of the resurrected plugins is causing this problem?  Everything worked OK in ML though.
    Thanks and appreciate any help.
    Todd
    trademarkauthority

    Let me start over ... the typical audio setting that FCP works with is 48khz, 16 bit stereo. If you check the sequence settings, it will probably show that to be the case unless you've created a sequence with other settings. The audio of any clip you bring into FCP really needs to match the sequence settings. To check the sequence settings go to Sequence->Settings.
    So far, you've confirmed the clip is 48khz sampling rate but you didn't say what it's bit depth was. In FCP, right click on the clip and select "Item Properties." That will tell you the information I've been asking about.
    -DH

  • Final cut pro audio/video settings

    Hello everyone:
    I'm new to the forums and somewhat new to final cut pro.
    I'm using final cut pro 5.0.4
    Im trying to record to a dvd record using a Sony DVCAM, but I don't know what the settings are for the audio/video settings are.
    What I want to do so play the project from Final cut to the dvd.
    Can anyone help me please
    thanks
    sandy
    PS I tried to exported it as a Quicktime movie but it do not work because I have photos (slides) that move.
    Message was edited by: nomadrw

    This is the quick and dirty way of doing it. Read the manuals (FCP, Compressor, DVD Studio Pro) for more information.
    Control-click on the sequence name in your Browser in FCP, and select Export > Using Compressor. The sequence name will then show up in Compressor. Select the sequence name that just showed up, and then on the top of the screen select one of the DVD:xxxxxx settings for your project. I would recommend the Best Quality options. You will see 90, 120, 150 minute options. Pick the lowest that you can without it being shorter than your sequence. For example, if your sequence is 92 min, select the 120 min option. You will need an MPEG setting as well as the Dolby setting. Once you have selected your presets, set their destination - use Desktop for now. When you have selected the Settings and Destination for the sequence, Click "Submit" on the lower right of the screen. Batch Monitor will pop up, telling you the progress. When the job has completed, open up DVD Studio Pro.
    Once DVDSP loads, you will see on the left side of the screen two large icons in the Graphical tab window. Select each one, control-click on it, and select Delete. Now click File > Import > Asset and choose each one of the files you encoded to your desktop. You should have an MPEG and a Dolby file. They will then show up in the lower left of your screen in the Assets tab once you have imported them. Select both at the same time, then simply drag them to the open space in the Graphical tab. It will create an icon like the ones you deleted. Control-click on the new icon, and select First Play. Put in a blank DVD, and then go to File > Burn. Once this is done burning you will end up with a DVD that you just put in your player and it will automatically play.
    Like I said, this is quick and dirty. Read the manuals, play with different settings, and get comfortable with each application.

  • Quicktime pro audio

    I have Quicktime Pro on Windows XP. The audio "spits." What do I need to do to get clean audio.

    Are the source videos muxed mpeg? QT will not export the sound from such files: QT Mpeg Limitations
    If so you can try this freeware Windows app
    http://www.videora.com/en-us/Converter/iPod/

  • Quicktime pro for videos

    Do i need quicktime pro to convert video to watch on my ipod?

    Try using an application such as MPEG Streamclip to convert the video.
    (26097)

  • The sample rates of the audio input and output devices do not match.

    I am trying to record line-in audio and keep getting this error.  have a realtek sound card.  I have tried everything I know but cannot record.  please help if you can, thanks.

    Setting the Sample Rate in Windows Vista and 7

  • Changing sample rates for recorded audio?

    I've been trying to record VO through premiere. I'm using an m-audio mobile pre which has never given me trouble in any other application. When i turn on Meter Input(s) Only from the panel menu of the track mixer i can clearly see the input move in time and responsively. When I record however the resulting clip is much shorter than the ammount of time recorded and the audio is all garbled and chopped. It clearly jumps out to me as a sample rate problem. I looked at the clips and they are 44.1 but the sequence i'm recording to is 48. I made a 44.1 sequence and recorded to that which worked fine but there must be a way to change the recording sample rate right? I can't find a solution anywhere. Anybody know?

    i'm just following up here. Thanks for the replies. I understood i would lose data as one answer suggests, but i wanted to convert it so i could work in a new song environment in which all the NEW tracks were recorded at 192. So the second answer was very helpful. incidentally, with further research we are recording at 96.

  • Can quicktime pro capture video stream?

    Can QT pro record video streams off the internet? I thought it was only able to capture embedded video files. Video streams aren't donwloaded into cache, so they have to be saved as they're received. Could someone clarify? Thank you.

    Pro can't save true streaming media.

Maybe you are looking for