Videos and audio in Youtube/Netflix/etc slow down often.

I've been getting random slow downs when I'm watching a video, either in Youtube or Netflix. The video will drop to about ~5 frames a second, and the sound stretches out and distorts. It usually goes back to normal after a few seconds, but on rare occasions, it keeps going on until I pause the video, or close the tab. I've asked a friend about it, and he told me to disable hardware acceleration, which helped a bit, but the problem is still happening. I'm using Firefox 22.0, if that helps.

Hello,
Try disabling graphics hardware acceleration. Since this feature was added to Firefox, it has gradually improved, but there still are a few glitches.
You might need to restart Firefox in order for this to take effect, so save all work first (e.g., mail you are composing, online documents you're editing, etc.).
Then perform these steps:
*Click the orange Firefox button at the top left, then select the "Options" button, or, if there is no Firefox button at the top, go to Tools > Options.
*In the Firefox options window click the ''Advanced'' tab, then select "General".
*In the settings list, you should find the ''Use hardware acceleration when available'' checkbox. Uncheck this checkbox.
*Now, restart Firefox and see if the problems persist.
Additionally, please check for updates for your graphics driver by following the steps mentioned in the following Knowledge base articles:
* [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems]]
* [[Upgrade your graphics drivers to use hardware acceleration and WebGL]]
Did this fix your problems? Please report back to us!
Thank you.

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How can I check if the program "youtube video and audio downloader 0.3.5 by Inbasic has any malware.
When I go to download it has the string
https://addons.mozilla.org/firefox/downloads/latest/413644/addon-413644-latest.xpi?src=userprofile
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Hello,
If you are trying to download videos, i will suggest you to use DownloadHelper add-on or DownThemAll. I have been using both of them and they works pretty well.

Scrol bar to slow down a video and audio file

Hello,
I need a scrol bar to slow down a video file (video and audio)
Thank you.

you want a video to play at something other than its native framerate?
if yes, you can't easily do that with an flvplayback component. you'll need to separate the audio and visual parts of your video and had them to a movieclip timeline. then you'll need to customize the playback speed of that movieclip.
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What is a safe add-on to download youtube video and audio, something virus and malware free?

What is a safe add-on to download youtube video and audio, something virus and malware free?

We do not really discuss add-on comparisons here, but note all officially hosted add-on extensions hosted on addons.mozilla.org and available from the Firefox User Interface will have been reviewed and be safe, secure and virus free.
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Hi eb
Welcome to Apple Discussions
Could be a bad Dynex adapter, return that one for another and/or cough up the extra $3 for Apples.
I'm now using a Mini-DVD to to DVI and a 21.5 LG monitor, but my Apple Mini-DVI to Video adapter and my 27" Sharp served me well for a couple of years.
See the Tip in > http://support.apple.com/kb/TA23844?
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Dennis

How to align or sync video and audio?

In Premiere 13, once I have added a video/audio clip and then either slow down the clip or add photos in between the clip causes the video and audio to be out of sync. How does one re-align or re-sync the clip once it has been edited? Thanks

mrsndmn
On what computer operating system is your Premiere Elements 13 running?
There are several ways to avoid disturbing an existing Timeline when you are adding to it.
1. Using what are called keyboard modifiers, such as Ctrl or Alt (Windows).
2. Grouping block of clips so that the clips move together
The following video tutorial is offered for informational and not promotional reasons
Premiere Elements: Arranging clips on the Timeline using modifier keys | lynda.com - YouTube
It uses a version of Premiere Elements earlier than 13, but the principles involved are the same.
The video and audio that are going out of sync.... are they linked or grouped before the addition to the existing Timeline?
After the fact, you will need to move the Timeline components back in place.
If the video and audio are not linked or group, you can
(a) highlight the clip, hold down the Alt key of the computer main
keyboard and tap the appropriate arrow key for a 1 frame per tap nudge of the clip.
(b) highlight the clip, hold down the Shift+Alt key of the computer main
keyboard and tap the appropriate arrow key for a 5 frames per tap nudge of the clip.
Please review and consider. If questions or need clarification on the above, please do not hesitate to ask.
Thank you.
ATR

Video and audio freezeing

For some reason my computer has been running super slow. When watching video like youtube and ustream. My video and audio will randomly start freezing which is super annoying, kind of like a skipping cd or dvd. I have reset safari and cache and its still doing it. i dont know what else to do any sujestions? thanks

Follow this workflow to help assure the best qualty video DVD:
Once you have the project as you want it save it as a disk image via the File ➙ Save as Disk Image menu option. This will separate the encoding process from the burn process.
To check the encoding mount the disk image, launch DVD Player and play it. If it plays OK with DVD Player the encoding is good.
Then burn to disk with Disk Utility or Toast at the slowest speed available (2x-4x) to assure the best burn quality. Always use top quality media: Verbatim, Maxell or Taiyo Yuden DVD-R are the most recommended in these forums.
OT

Internet streamed Video and Audio Lag when I roll over buttons/change tabs

Well just as the title suggests when I am watching videos online, aka youtube, hulu, etc, everything runs fine. But if I decide that I also want to check my facebook or something similar while watching these movies, the video and audio become choppy, even to the point where my audio will become distorted, and the video will just plain freeze. I'm wondering if this is a computer issue and if so how can I fix it?
I'm on a late 2007 13" white macbook, with a 2.16 GHz Intel Core 2 Duo and 2GB of RAM. I'm also using Google Chrome, but it also happens on Safari.

Well just as the title suggests when I am watching videos online, aka youtube, hulu, etc, everything runs fine. But if I decide that I also want to check my facebook or something similar while watching these movies, the video and audio become choppy, even to the point where my audio will become distorted, and the video will just plain freeze. I'm wondering if this is a computer issue and if so how can I fix it?
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How to sychronise a streaming video and audio?

Hello everyody,
I created a player application which plays a streaming video together with a sound. In the beggining it starts ok and sychronised but later video goes slower than sound and as a result they are totally out of sych at the end. I believe the problem is that the video file is bigger than the sound file and it buffers more so the video always stays behind the sound. Is there any way to fix it and have my video and audio always sychronised? To have the sound embeded with the audio is not an option.
Thank you in advance.

mrsndmn
On what computer operating system is your Premiere Elements 13 running?
There are several ways to avoid disturbing an existing Timeline when you are adding to it.
1. Using what are called keyboard modifiers, such as Ctrl or Alt (Windows).
2. Grouping block of clips so that the clips move together
The following video tutorial is offered for informational and not promotional reasons
Premiere Elements: Arranging clips on the Timeline using modifier keys | lynda.com - YouTube
It uses a version of Premiere Elements earlier than 13, but the principles involved are the same.
The video and audio that are going out of sync.... are they linked or grouped before the addition to the existing Timeline?
After the fact, you will need to move the Timeline components back in place.
If the video and audio are not linked or group, you can
(a) highlight the clip, hold down the Alt key of the computer main
keyboard and tap the appropriate arrow key for a 1 frame per tap nudge of the clip.
(b) highlight the clip, hold down the Shift+Alt key of the computer main
keyboard and tap the appropriate arrow key for a 5 frames per tap nudge of the clip.
Please review and consider. If questions or need clarification on the above, please do not hesitate to ask.
Thank you.
ATR

Making QtWebkit support HTML5 video and audio

For those who don't know, HTML5 enables most current browsers to play videos and audios without the need of any plugin. QtWebkit supports this feature, so browsers using it such as Rekonq and Arora should support it too. However on Arch Linux this does not work outside of the box.
I've tried to make this work and made a little progress, and I'm wondering if anyone has made similar attempts, have suggestions, or are willing to try this out. What I've done basically is to compile Qt with Phonon, and then remove the Phonon files when building the package, so that it uses the Phonon that comes with KDE. I included the PKGBUILD below, and you just need to copy the extra/qt directory from abs, and override the PKGBUILD or apply the patch.
I also installed phonon-vlc-qt from AUR, which according to this post contains some fixes to support HTML5 video/audio. However neither this nor the default gstreamer backend works for me. With vlc the vidoe doesn't play, and with gstreamer the browser crashes. To try different backends for Phonon, open KDE's System Settings - Multimedia - Backends, and use the Prefer and Defer buttons.
Some links for testing HTML5 video and audio:
http://html5test.com Only uses JavaScript to ask the browser if it supports the feature. What I've done does make these tests pass.
http://html5video.org
http://youtube.com/html5 Join the beta, and then open some youtube videos, and look for HTML5 in the player's control bar
The PKGBUILD:
# $Id: PKGBUILD 98480 2010-11-09 22:17:20Z andrea $
# Maintainer: Andrea Scarpino <[email protected]>
# Contributor: Pierre Schmitz <[email protected]>
pkgname=qt
pkgver=4.7.1
pkgrel=2
pkgdesc='A cross-platform application and UI framework'
arch=('i686' 'x86_64')
url='http://qt.nokia.com/'
license=('GPL3' 'LGPL')
depends=('libtiff' 'libpng' 'libmng' 'sqlite3' 'ca-certificates' 'glib2' 'dbus'
'fontconfig' 'libgl' 'libsm' 'libxrandr' 'libxv' 'libxi' 'alsa-lib'
'xdg-utils' 'hicolor-icon-theme')
optdepends=('postgresql-libs: PostgreSQL driver'
'libmysqlclient: MySQL driver'
'unixodbc: ODBC driver'
'libxinerama: Xinerama support'
'libxcursor: Xcursor support'
'libxfixes: Xfixes support')
makedepends=('mesa' 'postgresql-libs' 'mysql' 'unixodbc' 'cups' 'gtk2')
install="${pkgname}.install"
options=('!libtool')
_pkgfqn="qt-everywhere-opensource-src-${pkgver}"
source=("ftp://ftp.qt.nokia.com/qt/source/${_pkgfqn}.tar.gz"
'assistant.desktop' 'designer.desktop' 'linguist.desktop'
'qtconfig.desktop')
md5sums=('6f88d96507c84e9fea5bf3a71ebeb6d7'
'fc211414130ab2764132e7370f8e5caa'
'85179f5e0437514f8639957e1d8baf62'
'f11852b97583610f3dbb669ebc3e21bc'
'6b771c8a81dd90b45e8a79afa0e5bbfd')
build() {
unset QMAKESPEC
export QT4DIR=$srcdir/$_pkgfqn
export PATH=${QT4DIR}/bin:${PATH}
export LD_LIBRARY_PATH=${QT4DIR}/lib:${LD_LIBRARY_PATH}
cd $srcdir/$_pkgfqn
sed -i "s|-O2|$CXXFLAGS|" mkspecs/common/g++.conf
sed -i "/^QMAKE_RPATH/s| -Wl,-rpath,||g" mkspecs/common/g++.conf
sed -i "/^QMAKE_LFLAGS\s/s|+=|+= $LDFLAGS|g" mkspecs/common/g++.conf
./configure -confirm-license -opensource \
-prefix /usr \
-docdir /usr/share/doc/qt \
-plugindir /usr/lib/qt/plugins \
-importdir /usr/lib/qt/imports \
-datadir /usr/share/qt \
-translationdir /usr/share/qt/translations \
-sysconfdir /etc \
-examplesdir /usr/share/doc/qt/examples \
-demosdir /usr/share/doc/qt/demos \
-largefile \
-plugin-sql-{psql,mysql,sqlite,odbc} \
-system-sqlite \
-xmlpatterns \
-phonon \
-phonon-backend \
-svg \
-webkit \
-script \
-scripttools \
-system-zlib \
-system-libtiff \
-system-libpng \
-system-libmng \
-system-libjpeg \
-nomake demos \
-nomake examples \
-nomake docs \
-no-rpath \
-openssl-linked \
-silent \
-optimized-qmake \
-dbus \
-reduce-relocations \
-no-separate-debug-info \
-gtkstyle \
-opengl \
-no-openvg \
-glib
make
package() {
cd $srcdir/$_pkgfqn
make INSTALL_ROOT=$pkgdir install
# install missing icons and desktop files
for icon in tools/linguist/linguist/images/icons/linguist-*-32.png ; do
size=$(echo $(basename ${icon}) | cut -d- -f2)
install -p -D -m644 ${icon} ${pkgdir}/usr/share/icons/hicolor/${size}x${size}/apps/linguist.png
done
install -p -D -m644 src/gui/dialogs/images/qtlogo-64.png ${pkgdir}/usr/share/icons/hicolor/64x64/apps/qtlogo.png
install -p -D -m644 tools/assistant/tools/assistant/images/assistant.png ${pkgdir}/usr/share/icons/hicolor/32x32/apps/assistant.png
install -p -D -m644 tools/designer/src/designer/images/designer.png ${pkgdir}/usr/share/icons/hicolor/128x128/apps/designer.png
install -d ${pkgdir}/usr/share/applications
install -m644 ${srcdir}/{linguist,designer,assistant,qtconfig}.desktop ${pkgdir}/usr/share/applications/
# install license addition
install -D -m644 LGPL_EXCEPTION.txt ${pkgdir}/usr/share/licenses/qt/LGPL_EXCEPTION.txt
# Fix wrong path in pkgconfig files
find ${pkgdir}/usr/lib/pkgconfig -type f -name '*.pc' \
-exec perl -pi -e "s, -L${srcdir}/?\S+,,g" {} \;
# Fix wrong path in prl files
find ${pkgdir}/usr/lib -type f -name '*.prl' \
-exec sed -i -e '/^QMAKE_PRL_BUILD_DIR/d;s/$QMAKE_PRL_LIBS =$.*/\1/' {} \;
# Remove phonon files which are installed by KDE
rm -r ${pkgdir}/usr/{include/phonon/,lib/libphonon*,lib/pkgconfig/phonon.pc}
Diff from qt's PKGBUILD in ABS:
--- PKGBUILD.orig 2010-12-15 13:18:19.000000000 -0500
+++ PKGBUILD 2010-12-15 13:19:15.000000000 -0500
@@ -57,8 +57,8 @@
-plugin-sql-{psql,mysql,sqlite,odbc} \
-system-sqlite \
-xmlpatterns \
- -no-phonon \
- -no-phonon-backend \
+ -phonon \
+ -phonon-backend \
-svg \
-webkit \
-script \
@@ -109,4 +109,6 @@
# Fix wrong path in prl files
find ${pkgdir}/usr/lib -type f -name '*.prl' \
-exec sed -i -e '/^QMAKE_PRL_BUILD_DIR/d;s/$QMAKE_PRL_LIBS =$.*/\1/' {} \;
+ # Remove phonon files which are installed by KDE
+ rm -r ${pkgdir}/usr/{include/phonon/,lib/libphonon*,lib/pkgconfig/phonon.pc}
Last edited by hagabaka (2010-12-15 22:11:46)

Use a minidisplay/HDMI cable for video:
http://www.cnaweb.com/6-mini-displayport-male-to-hdmi-male-cable.aspx?gclid=CMbn pNem57wCFRQS7AodzDQACg
A 2009 MBP does not support audio via HDMI so you will have to tap the Audio Output port. Use a 3.5 mmRCA plugs and tap the RCA audio inputs on the TV with a cable such as this:
http://www.monoprice.com/Product?c_id=102&cp_id=10218&cs_id=1021817&p_id=9768&se q=1&format=2&utm_expid=58369800-11.R-enhtUGRrSdHz5vzpVS2g.0&utm_referrer=http%3A %2F%2Fwww.monoprice.com%2FCategory%3Fc_id%3D102%26cp_id%3D10256%26gclid%3DCM2Vro yn57wCFZLm7AodHjkAlQ
Ciao.

Choppy Video and Audio in Chrome after update to Yosemite

Anyone having the same issue as me? In Chrome my video and audio is choppy (play 1/2 second, pause, play again, etc). If I close Chrome (and quit all the way), and restart all is good for a few hours, then right back to the choppy playback (YouTube, Pandora, anything...). Only since updating to Yosemite. Any tips/suggestions?

I have this issue as well.
Only way I know to fix it is to CMD + Q and quit the Chrome process entirely. I'm a web developer so it's super awesome when I have to kill my 20 browser sessions just to fix this issue.
I have confirmed this issue happens in the HTML 5 video player as well as in Flash video.
NOTE: In the video below the audio/video skipping is part of the recording.
https://www.youtube.com/watch?v=9s1SiCQb-RU&feature=youtu.be

New to iMovie, create live video and audio?

Hello, I am trying to create a video of a live musical performance to post on youtube and have figured out how to use the isight to get a video but can I use the biult in mics to record live audio with the video?

Hello, Nateomite
As Karsten says, you will certainly get better results and much more convenience with a camcorder.
However, if you decide to use your MacBook, the built-in mic can record audio with your video:
in iChat: iChat > Video > Record Chat records both video and audio.
in iMovie: http://docs.info.apple.com/article.html?path=iMovie/7.0/en/10172.html
tells you how to record using your MacBook's built-in iSight (and mic.)
Other movie/video recording apps may work differently, but most allow sound with video.
EZ Jim
Message was edited by: EZ Jim for other apps
G5 DP 1.8GHz w/Mac OS X (10.5.7) PowerBook 1.67GHz (10.4.11) iBookSE 366MHz (10.3.9) External iSight

Recording Video and Audio at Same time with simultaneous sync

I want to record a keyboard performance into garageband and at the same time record the playing of that performance with my video camera. Then I want to create a movie using the music from garageband and the video from the camera. I was thinking that if I can sync the video and audio when I'm recording the session, then that part is taken care of. Or, maybe this is easier than I think it is?
Is there a way to do this so that I can use the garageband record performance and have it synced to the video on the camera?
I don't want to use the audio from the video camera because the performance that is captured in Garageband will be much better and I can do editing of the individual notes in GB.
In the end, I just want to make a movie and/or podcast of the performance.
I'm a newbie regarding this, but I did search the forums and couldn't find anything specific. Mostly it was about importing video into GB3 and then syncing new audio. I'll basically have audio and video from the same performance in two separate locations and I want to bring them together perfectly in Garageband.
Thanks for any help you can provide.
Powerbook G4 - DVI Mac OS X (10.4.9)

Okay. I got the video and audio all together. I told you I'd link to it when it was up.
http://www.youtube.com/watch?v=FxssYpUNJm8
There's also a copy of it at http://www.myspace.com/bonjimmy/
And as a quick side comment, even though I uploaded the same video to both YouTube and MySpace, the MySpace version is much better. YouTube must do something to the video after it's uploaded.
What I learned doing this project:
I recorded the video first (which gave me the sequencing of the piano performance) and then I dubbed the audio in later. However, there wasn't a good way to sync the video and the prerecorded piano, so there are some spots where the dubbed audio vocal isn't accurate to the video. I'm not sure what the pros do for this. I was hoping I'd remember how I sang for the video but when a couple weeks go by before re-doing the audio, it's about impossible. I tried, though.
I remember working with an old 4-track and smpte to a sequencer a long time ago. With the way it is now, it's pretty cool that you can record digitally and mix and match and everything falls together perfectly as long as you have a place to match the video and the audio. It's pretty cool.
What else???
Does anyone have suggestions that would have made it better? Also, if you have suggestions on my performance or whatever, I'd love comments, but you can do that on the linked page.
Thanks again for all your help. (The point of the video is because I'm thinking about getting back out there and doing some more playing... I'm looking for a band or something else interesting...)
Powerbook G4 - DVI Mac OS X (10.4.10)

Getting Ripped DVD Video and Audio Into Encore

Do you have previously authored DVDs that need rework? Do you want to add menus with greater impact and functionality? Do you want to add some additional program or supplemental material? Does a client want their product demo DVD to be updated to reflect the capabilities of the new and improved version, but the source files no longer exist? Using Adobe Encore DVD and a freeware utility called DVD Decrypter (DVDD), you can accomplish this quickly and easily.
Disclaimer: I do not support the illegal copying and/or distribution of copyrighted works. The authors and distributors of the software I use have made it clear that they do not support illegal copying. This guide is intended solely to assist you in ripping and copying DVD video to which you have the legal rights. Any use of this guide to infringe the copyright of someone else’s intellectual property is prohibited.
This guide is based on Adobe Encore DVD 1.5.1 and DVD Decrypter version 3.5.4.0. Let’s Begin!
Place the DVD to be ripped in your DVD drive and launch DVDD. If you have more than one drive (e.g., a DVD-ROM and a DVD burner) make sure the one with the disc is selected in the Source dropdown list in the main program window. Now we need to set up DVDD to extract video in a way that is “Encore friendly”. This is the toughest part of the whole exercise. Click on the Tools menu item and choose “Settings…”.
Settings
General Tab: You can leave these set at their defaults if you like. Personally, I specify a custom Default Destination. I put my ripped video assets all in one place anyway, and having a default destination means I have one less thing to do when I rip a DVD.
IFO Mode Tab: Make sure that “Select Main Movie PGC” and “Enable Stream Processing” are checked. “Uncheck Suspect Cells” is probably a good default safety check. If your hard disks are formatted as NTFS, set File Splitting to “None”. I leave “Copy IFO File” checked with the default sub-items checked. Make sure that “Patch M2V Timecode” is unchecked. The items in the Create Additional Files section are purely optional. The author of DVDD has been kind enough to list which programs need which files; notice that Encore DVD isn’t listed as needing any of these extra files. I do keep the “Stream Information” box checked. DVDD generates very informative file names, but I like to keep “Include PGC Number” under File Names checked. Be advised you will get some lengthy file names after DVDD is finished ripping.
Stream Processing Tab: Since we enabled stream processing in the IFO Mode tab, we need to tell DVDD how to process those streams. To save yourself time and confusion later, check the “Convert PCM to WAV” box. Earlier versions of Encore required a Demuxed audio stream and a Raw video stream. Encore 1.5.1 can accept either type of video stream (Raw or Demuxed) but it does still require a Demuxed audio stream. However, I still recommend using Raw video and Demuxed audio, if only because it seems to be somewhat faster to process in DVDD. This workflow is also backward-compatible with earlier versions of Encore.
So let’s set up the Stream Processing tab now. In the Demux box, enter “0x8? 0xA? 0xC?”. This ensures that all audio streams in the selected PGC, whether AC3, PCM or MPEG will be set to Demux. In the Raw box, enter “0xE0”. This ensures that the video from the selected PGC will be set to Raw.
Additional Notes about the Stream Processing Tab:
1. For those of you asking the question, “What the heck is a PGC?” it’s just DVD-speak for the titles in a DVD project. And I’m not talking about the opening or end credits, either; I’m talking about the titles that result, for example, from the timelines you create in an Encore DVD project. There is a subtle difference between a PGC and a VTS (title set), but that's not important right now.
2. Happily, recent versions of DVDD create a WAV file after ripping that will import directly into Encore. Versions prior to 3.2.0.0 would create a WAV file that had to be imported to, and exported from, a sound editing program like Adobe Audition, Goldwave or SoundForge before Encore would recognize it.
Events Tab: For convenience sake, I recommend setting “Set Program Mode” in the Startup section to “IFO”. That way, whenever you launch DVDD, it will look familiar to you. You may safely ignore all of the other tabs in the Settings dialog.
Ripping
1.Under the Input Tab of the main program window, select the PGC you want to rip. You can only do one at a time.
2.Switch to the Stream Processing Tab. Verify that Enable Stream Processing is checked.
3.Check or uncheck any or all of the video and audio streams that are listed. Highlight each one to verify that all audio streams are set to Demux and the video stream is set to Raw.
4.If you didn’t select Default Destination in the General Settings Tab, then you need to tell DVDD where to put the ripped files now.
5.Click on the big DVD-to-Disk icon.
6.DVDD will announce, quite loudly, when it has finished. At that point you can rename the files or import them as is into Encore.
I hope you find this guide useful and that it helps you get the most out of your investment in Adobe Encore DVD.
Guide © Jeff Bellune 2005

OK, I can't tell you what we are doing, you'll have to trust me that it's for a very good cause. I'll simplify the use case as an example. If I can do the following we'll be OK:
1) Read video/audo files from a DVD that we created
2) Open these files with the QuickTime Player, click on Export to Apple TV to create an output file.
I'd rather not do an interim conversion of the video data (like use a 3rd party app to convert to mp4 first and then read into QT, but I'm considering a conversion to DV) because that could seriously hurt the apps effectiveness. I also can't use another app (MPEG Streamclip, HandBrake, VisualHub, etc.) to do the conversion.

ITunes 11.02 update - video and audio no longer working

I updated to iTunes 11.02 last night.
Now, I can't play any video or any audio files, whether using iTunes or Quicktime. Even online Vimeo and YouTube content won't play. Clicking the play button does nothing - the movie or song's progress indicator doesn't move.
In Sytem Preferences > Sound: I get the following message for input and output devices "No input device found" and "No output device found"
There doesn't seem to be a way to check if the graphics card is recognised but it's still showing up in the system profiler.
Looks like the iTunes update has completely nixed my laptop's video and audio capabilities. Does anyone have any recommendations?

I do a lot of SONY HRD FX1 native 1080i HDV capture with Final Cut Pro 5 on my PowerBook 1.3 GHz G4..
Before Apple started supporting HDV, getting the audio and video lined up was such a nightmare that it wasn't even worth working on projects.
My material works great inside FCP 5, but I have had similar problems to what you describe when making the DVDs
However, I use DVD Studio Pro and was able to move the audio relative to the video slightly to get the most important parts to line up. However if your audio and video clips aren't the same length then you will have variable slippage for long clips.
I have been using MPEG Power Professional (Heuris Inc) to do my MPEG2 video encodes as well as my audio encodes and I haven't had the problem lately.

Videos and audio in Youtube/Netflix/etc slow down often.

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