Progressive Audio Desync - Revision history

Ballofsnow: /* Introduction */ link to AviSynth method.

2008-01-13T22:20:41Z

‎Introduction: link to AviSynth method.

Ballofsnow: Pants.

2007-08-11T22:54:56Z

Pants.

Ballofsnow: Progressive Desync moved to Progressive Audio Desync: More specific.

2007-02-17T21:58:58Z

Progressive Desync moved to Progressive Audio Desync: More specific.

HidoiMidoriRyuu: Progressive audio desync guide.

2007-02-17T19:58:27Z

Progressive audio desync guide.

New page

== Fixing Progressive Audio Desync ==

===Introduction===
This guide is for fixing the progressive audio desync problem, that is if the sound starts out synced but gets more and more desynced during the course of the video.

===Tools===
For this guide I will use VirtualDubMod, Media Player Classic and [http://audacity.sourceforge.net Audacity]. Any other programs with the same functionality should work too.

===Ripping the sound===
If the sound and video is in the same file start up VirtualDubMod and load the source file. Go to Stream -> Stream List, select the audio stream and choose Save Wav. If the sound is in a separate file make sure to convert it to wav if it is not. If you need a converter [http://dbpoweramp.com/ dBpoweramp] has support for most sound formats, just search the codec list on their site.

===Fixing the desync===
Load the saved wav in Audacity. Then play the source file in VirtualDubMod and listen at the end and check the time to see how much off the sound is in seconds. Then go back to Audacity and press Ctrl+A to mark the full length of the sound and under Effect choose Change Tempo and under Length (seconds) change the length of the sound with how much the sound is out of sync. If the sound is slower than the video, shorten it and vice versa. Then go under File and choose Export as Wav. Save the file under a different name.

Then open Media Player Classic and choose Open File. In Open choose the video file and in Dub choose the edited sound file. Now check at the end and see if the sound is in sync. If it is, go to the next step, otherwise reload the original sound file in Audacity and change the tempo again. Changing the tempo on the edited file repeatedly might lower the sound quality so always do that on the source file.

===Using the edited sound===
If you're encoding in VirtualDubMod load the source video and go into Streams -> Stream List and choose Add to add the edited sound file. If the original audio stream is in the list, disable it.

For use with AviSynth just create a script file with the line
<pre><nowiki>
wavsource("K:\Path\To\Fixed_Audio_File.wav")
</nowiki></pre>
and load it in MeGUI to convert the sound to the formats required.

@@ Line 4: / Line 4: @@
 ===Introduction===
 This guide is for fixing progressive audio desync in your source files, that is if the sound starts out synced but gets more and more desynced during the course of the video. This is not a guide for videos that have been incorrectly appended in VirtualDub(Mod).
 <br>
 ===Tools===
 For this guide I will use <b>VirtualDubMod</b>, <b>Media Player Classic</b> and <b>[http://audacity.sourceforge.net Audacity]</b>. Any other programs with the same functionality should work too.

@@ Line 3: / Line 3: @@
 ===Introduction===
-This guide is for fixing the progressive audio desync problem, that is if the sound starts out synced but gets more and more desynced during the course of the video.
+This guide is for fixing progressive audio desync in your source files, that is if the sound starts out synced but gets more and more desynced during the course of the video. This is not a guide for videos that have been incorrectly appended in VirtualDub(Mod).
-−
 ===Tools===
 For this guide I will use <b>VirtualDubMod</b>, <b>Media Player Classic</b> and <b>[http://audacity.sourceforge.net Audacity]</b>. Any other programs with the same functionality should work too.
+<br>
 ===Ripping the sound===
 If the sound and video is in the same file start up VirtualDubMod and load the source file. Go to Stream -> Stream List, select the audio stream and choose Save Wav. If the sound is in a separate file make sure to convert it to wav if it is not. If you need a converter [http://dbpoweramp.com/ dBpoweramp] has support for most sound formats, just search the codec list on their site.
+<br>
 ===Fixing the desync===
 Load the saved wav in Audacity. Then play the source file in VirtualDubMod and listen at the end and check the time to see how much off the sound is in seconds. Then go back to Audacity and press Ctrl+A to mark the full length of the sound and under Effect choose Change Tempo and under Length (seconds) change the length of the sound with how much the sound is out of sync. If the sound is slower than the video, shorten it and vice versa. Then go under File and choose Export as Wav. Save the file under a different name.
@@ Line 19: / Line 19: @@
 Then open Media Player Classic and choose Open File. In Open choose the video file and in Dub choose the edited sound file. Now check at the end and see if the sound is in sync. If it is, go to the next step, otherwise reload the original sound file in Audacity and change the tempo again. Changing the tempo on the edited file repeatedly might lower the sound quality so always do that on the source file.
+<br>
 ===Using the edited sound===
 If you're encoding in VirtualDubMod load the source video and go into Streams -> Stream List and choose Add to add the edited sound file. If the original audio stream is in the list, disable it.

← Older revision	Revision as of 21:58, 17 February 2007
(No difference)