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How to stretch a shorter audio track to fit longer video with Audacity
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I've demuxed an audio commentary track from a DVD release of a movie. My plan is to mux this commentary track back into a Blu-Ray version of the movie. However, the problem is that the Blu-Ray is 4 minutes and 15 seconds longer than the original.
Therefore, I want to edit the original audio track so that it is gradually stretched out to accommodate the extra few minutes of footage, ensuring that it doesn't cut out before the movie does. However, I also need to make sure that doing so doesn't alter the sound too much.
How can I do this in Audacity? I've come across both the Change Tempo and Paulstretch filters, but I'm not sure how or even whether I can use these to accomplish what I'm looking for.
audio video video-editing audacity multiplexing
asked 5 hours ago
HashimHashim
3,36173264
add a comment |
I've demuxed an audio commentary track from a DVD release of a movie. My plan is to mux this commentary track back into a Blu-Ray version of the movie. However, the problem is that the Blu-Ray is 4 minutes and 15 seconds longer than the original.
Therefore, I want to edit the original audio track so that it is gradually stretched out to accommodate the extra few minutes of footage, ensuring that it doesn't cut out before the movie does. However, I also need to make sure that doing so doesn't alter the sound too much.
How can I do this in Audacity? I've come across both the Change Tempo and Paulstretch filters, but I'm not sure how or even whether I can use these to accomplish what I'm looking for.
audio video video-editing audacity multiplexing
asked 5 hours ago
HashimHashim
3,36173264
Have you compared the frame-rates of the source and destination?
– JakeGould
5 hours ago
@JakeGould It hadn't occurred to me to do so. I just checked, and FFmpeg reports that the DVD source that the audio track is taken from has an FPS of 25, and the destination Blu-Ray has an FPS of 23.98.
– Hashim
4 hours ago
That kind of difference in length could be an offset issue as well as the slight FPS difference. I would see if you can line up the beginning of the audio and video and see how that plays. Then see if you can downsample the audio to 23.98 FPS. This stuff gets complicated.
– JakeGould
4 hours ago
@JakeGould When you say line up the audio and video and "see how it plays", what exactly am I aiming for? To get the audio in sync? If so, what would be the purpose of then downsampling the audio to 23.98 FPS? Also I'm not sure exactly how I would downsample audio since to my knowledge audio tracks don't have framerates.
– Hashim
3 hours ago
add a comment |
I've demuxed an audio commentary track from a DVD release of a movie. My plan is to mux this commentary track back into a Blu-Ray version of the movie. However, the problem is that the Blu-Ray is 4 minutes and 15 seconds longer than the original.
Therefore, I want to edit the original audio track so that it is gradually stretched out to accommodate the extra few minutes of footage, ensuring that it doesn't cut out before the movie does. However, I also need to make sure that doing so doesn't alter the sound too much.
How can I do this in Audacity? I've come across both the Change Tempo and Paulstretch filters, but I'm not sure how or even whether I can use these to accomplish what I'm looking for.
audio video video-editing audacity multiplexing
asked 5 hours ago
HashimHashim
3,36173264
I've demuxed an audio commentary track from a DVD release of a movie. My plan is to mux this commentary track back into a Blu-Ray version of the movie. However, the problem is that the Blu-Ray is 4 minutes and 15 seconds longer than the original.
Therefore, I want to edit the original audio track so that it is gradually stretched out to accommodate the extra few minutes of footage, ensuring that it doesn't cut out before the movie does. However, I also need to make sure that doing so doesn't alter the sound too much.
How can I do this in Audacity? I've come across both the Change Tempo and Paulstretch filters, but I'm not sure how or even whether I can use these to accomplish what I'm looking for.
audio video video-editing audacity multiplexing
audio video video-editing audacity multiplexing
asked 5 hours ago
HashimHashim
3,36173264
asked 5 hours ago
HashimHashim
3,36173264
edited 4 hours ago
Hashim
asked 5 hours ago
HashimHashim
3,36173264
asked 5 hours ago
HashimHashim
3,36173264
asked 5 hours ago
HashimHashim
3,36173264
3,36173264
Have you compared the frame-rates of the source and destination?
– JakeGould
5 hours ago
@JakeGould It hadn't occurred to me to do so. I just checked, and FFmpeg reports that the DVD source that the audio track is taken from has an FPS of 25, and the destination Blu-Ray has an FPS of 23.98.
– Hashim
4 hours ago
That kind of difference in length could be an offset issue as well as the slight FPS difference. I would see if you can line up the beginning of the audio and video and see how that plays. Then see if you can downsample the audio to 23.98 FPS. This stuff gets complicated.
– JakeGould
4 hours ago
@JakeGould When you say line up the audio and video and "see how it plays", what exactly am I aiming for? To get the audio in sync? If so, what would be the purpose of then downsampling the audio to 23.98 FPS? Also I'm not sure exactly how I would downsample audio since to my knowledge audio tracks don't have framerates.
– Hashim
3 hours ago
add a comment |
Have you compared the frame-rates of the source and destination?
– JakeGould
5 hours ago
@JakeGould It hadn't occurred to me to do so. I just checked, and FFmpeg reports that the DVD source that the audio track is taken from has an FPS of 25, and the destination Blu-Ray has an FPS of 23.98.
– Hashim
4 hours ago
That kind of difference in length could be an offset issue as well as the slight FPS difference. I would see if you can line up the beginning of the audio and video and see how that plays. Then see if you can downsample the audio to 23.98 FPS. This stuff gets complicated.
– JakeGould
4 hours ago
@JakeGould When you say line up the audio and video and "see how it plays", what exactly am I aiming for? To get the audio in sync? If so, what would be the purpose of then downsampling the audio to 23.98 FPS? Also I'm not sure exactly how I would downsample audio since to my knowledge audio tracks don't have framerates.
– Hashim
3 hours ago
Have you compared the frame-rates of the source and destination?
– JakeGould
5 hours ago
Have you compared the frame-rates of the source and destination?
– JakeGould
5 hours ago
@JakeGould It hadn't occurred to me to do so. I just checked, and FFmpeg reports that the DVD source that the audio track is taken from has an FPS of 25, and the destination Blu-Ray has an FPS of 23.98.
– Hashim
4 hours ago
@JakeGould It hadn't occurred to me to do so. I just checked, and FFmpeg reports that the DVD source that the audio track is taken from has an FPS of 25, and the destination Blu-Ray has an FPS of 23.98.
– Hashim
4 hours ago
That kind of difference in length could be an offset issue as well as the slight FPS difference. I would see if you can line up the beginning of the audio and video and see how that plays. Then see if you can downsample the audio to 23.98 FPS. This stuff gets complicated.
– JakeGould
4 hours ago
That kind of difference in length could be an offset issue as well as the slight FPS difference. I would see if you can line up the beginning of the audio and video and see how that plays. Then see if you can downsample the audio to 23.98 FPS. This stuff gets complicated.
– JakeGould
4 hours ago
@JakeGould When you say line up the audio and video and "see how it plays", what exactly am I aiming for? To get the audio in sync? If so, what would be the purpose of then downsampling the audio to 23.98 FPS? Also I'm not sure exactly how I would downsample audio since to my knowledge audio tracks don't have framerates.
– Hashim
3 hours ago
@JakeGould When you say line up the audio and video and "see how it plays", what exactly am I aiming for? To get the audio in sync? If so, what would be the purpose of then downsampling the audio to 23.98 FPS? Also I'm not sure exactly how I would downsample audio since to my knowledge audio tracks don't have framerates.
– Hashim
3 hours ago
add a comment |
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Have you compared the frame-rates of the source and destination?
– JakeGould
5 hours ago
@JakeGould It hadn't occurred to me to do so. I just checked, and FFmpeg reports that the DVD source that the audio track is taken from has an FPS of 25, and the destination Blu-Ray has an FPS of 23.98.
– Hashim
4 hours ago
That kind of difference in length could be an offset issue as well as the slight FPS difference. I would see if you can line up the beginning of the audio and video and see how that plays. Then see if you can downsample the audio to 23.98 FPS. This stuff gets complicated.
– JakeGould
4 hours ago
@JakeGould When you say line up the audio and video and "see how it plays", what exactly am I aiming for? To get the audio in sync? If so, what would be the purpose of then downsampling the audio to 23.98 FPS? Also I'm not sure exactly how I would downsample audio since to my knowledge audio tracks don't have framerates.
– Hashim
3 hours ago