<html><head><meta http-equiv="Content-Type" content="text/html charset=iso-8859-1"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "> Dear Lindsay,<div> It seems likely that your video recorder was not digital; hopefully the audio recorder was. If so, do the following: Open the two audio files in Praat. Get the (exact) ratio of the from-audio wav file to the from-video wav file (dur_from_audio/dur_from_video). Select the from-video sound object. From the Convert menu, choose "Lengthen (overlap-add)". This will use the PSOLA algorithm to change the duration but maintain the original F0. Put your ratio in the "Factor" field and click OK. This should create a new sound object with the same duration as the from-audio file. Check to make sure it all seems right. </div><div> Don't forget to save the new sound object! It's not a file until you save it.</div><div> Hope this works, Doug DhW</div><div><br></div><div><br><div><div>On Sep 15, 2014, at 4:16 PM, Lindsay Marean <<a href="mailto:lmarean@bensay.org">lmarean@bensay.org</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">I'm hoping that someone here on ILAT has run into this problem and can suggest a way to deal with it:<br><br>We're recording fluent speakers talking, with both audio recorders and video recorders. Recently I recorded a session in which an audio recorder picked up one speaker really well, and a video recorder picked up another speaker really well. I can use Audacity to combine the audio (one on each stereo channel) into a single WAV file that I can then use with ELAN for transcription.<br><br>The problem is that the two recorders don't record at exactly the same speed. In a long session, this difference becomes very noticeable - the two tracks may be perfectly synchronized at the beginning, but they will be out of sync by the end.<br><br>Here are a few things I've found on the Internet that I think discuss the same issue: <a href="http://www.acoustica.com/mixcraft/v4/help/hs1550.htm">http://www.acoustica.com/mixcraft/v4/help/hs1550.htm</a> and <a href="http://forum.audacityteam.org/viewtopic.php?f=46&t=75868">http://forum.audacityteam.org/viewtopic.php?f=46&t=75868</a>.<br><br>I've been trying to use the change tempo function of Audacity to adjust one track, but it's been trial-and-error - change by a small value, see if it works, and then when it doesn't, undo the change, and change by a different small value. So far my approach is really time-consuming but still not really successful for making a transcribable track.<br><br>Has anyone else dealt with this problem? How? Does anyone know of a better way to get both tracks moving at the same speed, beginning to end?<br><br>Thank you!<br>Lindsay Marean<br></blockquote></div><br></div><br><br><div apple-content-edited="true">
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><span class="Apple-style-span" style="border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><span class="Apple-style-span" style="border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div><span class="Apple-style-span" style="font-family: Tahoma, Verdana, Arial, sans-serif; ">Douglas H. Whalen, President <br>Endangered Language Fund <br>300 George St., Suite 900 <br>New Haven, CT 06511 <br>USA <br>+1-203-865-6163, ext. 265 (or 234 for Whalen) <br><a href="mailto:elf@endangeredlanguagefund.org">elf@endangeredlanguagefund.org</a> <br> <a href="http://www.endangeredlanguagefund.org">www.endangeredlanguagefund.org</a></span></div></span></span></span></div></span></span>
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