Sample Rate Conversion Options
When importing AAF or OMF tracks into Pro Tools, these settings let you convert the sample rate of the session’s audio files. For example, you can convert from 48 kHz to 44.1 kHz, or from 44.1 kHz to 48 kHz. Avid HDX, HD Native, and Pro Tools|HD systems support sample rates higher than 48 kHz (88.2 kHz, 96 kHz, 176.4 kHz, and 192 kHz). These settings also enable you to convert to compensate for the 0.1% speed change (pull up or pull down) between 24 fps film and 29.97 fps NTSC video, or the 4% speed change (pull up or pull down) between 24 fps film and 25 fps PAL video.
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This setting lets you specify the sample rate of the audio material you are working with in Pro Tools, independent of the project sample rate settings.
For example, you may receive a project originated on Media Composer at 44.1 kHz. If you want to work at 48 kHz in Pro Tools, you should set the Source Audio Sample Rate setting to 44,100 and the Destination Audio Sample Rate to 48,000.
These settings can also be used to correct for pull up or pull down problems. For example, you may receive an AAF or OMF transfer from a Film Composer that contains audio media at “film speed” when played back at 48 kHz. You may want to convert all the audio files and edits to play back at NTSC video speed and 48 kHz.
In this case, set the Source Audio Sample Rate setting to 47,952 and the Destination Audio Sample Rate to 48,000. These settings tell Pro Tools that you want to fit 47,952 of the original “film speed” samples into 48,000 of the new “video speed” samples. With these settings, you sample-rate-convert the material to NTSC video speed.
You can set the Source Audio Sample Rate either by selecting one of the predefined sample rates from the pop-up menu, or by typing a value into the text box.
This setting determines the target session’s audio sample rate setting, as shown in the Session Setup window, and the sample rate of all audio files in the target session. Available settings include Pro Tools standard sample rates of 44.1 kHz or 48 kHz. Avid HDX, HD Native, and Pro Tools|HD systems support sample rates higher than 48 kHz (88.2 kHz, 96 kHz, 176.4 kHz, and 192 kHz).
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If this setting differs from the Source Audio Sample Rate setting, audio is sample-rate converted digitally to the Destination Audio Sample Rate.
This pop-up menu lets you select settings corresponding to Pro Tools sample rate conversion settings. The Tweak Head (Slowest) option provides the best results.