Automated audio conform
View Patent ↗A guide start location is located in a guide segment of a guide track. The guide segment has a segment length. A part start location of a part corresponding to the guide start location is located. N phase correlations are performed between N successively overlapped part segments of the part from the part start location and the guide segment from the guide start location within a first interval. Each of the N successively overlapped part segments has the segment length. A best match is determined from the N phase correlations using a match threshold. The best match provides a first offset.
1. A method comprising:
locating a guide start location in a guide segment of a guide track, the guide segment having a segment length;
locating a part start location of a part corresponding to the guide start location;
performing N phase correlations between N successively overlapped part segments of the part from the part start location and the guide segment from the guide start location within a first interval using Fast Fourier Transforms (FFTs), each of the N successively overlapped part segments having the segment length; and
determining a best match from the N phase correlations using a match threshold, the best match providing a first offset.
2. The method of claim 1 further comprising:
obtaining candidate offsets at pre-determined increments throughout the guide segment using the first offset; and
filtering the first offset and the candidate offsets to obtain a guide-to-part offset.
3. The method of claim 2 further comprising:
determining a part end location.
4. The method of claim 2 wherein obtaining the candidate offsets comprises:
performing phase correlations between subsequent part segments and subsequent guide segments, the subsequent part segments and subsequent guide segments being located at the pre-determined increments; and
selecting the candidate offsets using the match threshold.
5. The method of claim 2 wherein filtering the first offset and the candidate offsets comprises:
discarding a plurality of low and high extremes of the first offset and the candidate offsets; and
computing the guide-to-part offset as average of remaining offsets if the remaining offsets are within a pre-determined variation level.
6. The method of claim 3 wherein locating the start location in the guide segment comprises:
if the guide segment is a first segment
skipping a tone if present, and
locating a first sample greater than a threshold level;
else if the guide segment is a subsequent segment
subtracting the guide-to-part offset from the part end of location to provide a difference, and
adding the difference with a time interval.
7. The method of claim 3 further comprising:
determining an overlap between a current part and a next part;
if the overlap is sufficient,
determining a match between end of the current part and beginning of the next part,
calculating a part-to-part offset,
calculating a fade-in location, and
calculating a fade duration.
8. The method of claim 7 wherein determining the match comprises:
performing a phase correlation between overlapped samples of the end of the current part and the beginning of the next part.
9. The method of claim 7 further comprising:
creating a conform file using the guide-to-part offset, the part start location, the part end location, the part-to-part offset, the fade-in location, and the fade duration.
10. The method of claim 9 wherein creating the conform file comprises:
copying the part located by the guide-to-part offset to the conform file until the fade-in location of the part is reached.
11. The method of claim 10 further comprising:
if the part-to-part offset is non-zero, locating start of the next part using the part-to-part offset,
else locating start of the next part using the guide-to-part offset of the next part;
performing a cross fade operation; and
copying the next part until the fade-in location of the next part is reached.
12. The method of claim 1 wherein the guide track is a reference audio track that matches a motion picture from start to finish.
13. The method of claim 1 wherein the part is an audio foreign language track associated with a motion picture.
14. An article of manufacture comprising:
a non-transitory machine-accessible medium including data that, when accessed by a machine, cause the machine to perform operations comprising:
locating a guide start location in a guide segment of a guide track, the guide segment having a segment length;
locating a part start location of a part corresponding to the guide start location;
performing N phase correlations between N successively overlapped part segments of the part from the part start location and the guide segment from the guide start location within a first interval using Fast Fourier Transforms (FFTs), each of the N successively overlapped part segments having the segment length; and
determining a best match from the N phase correlations using a match threshold, the best match providing a first offset.
15. The article of manufacture of claim 14 wherein the data further comprises data that, when accessed by a machine, cause the machine to perform operations comprising:
obtaining candidate offsets at pre-determined increments throughout the guide segment using the first offset; and
filtering the first offset and the candidate offsets to obtain a guide-to-part offset.
16. The article of manufacture of claim 15 wherein the data further comprises data that, when accessed by a machine, cause the machine to perform operations comprising:
determining a part end location.
17. The article of manufacture of claim 15 wherein the data causing the machine to perform obtaining the candidate offsets comprise data that, when executed by the machine, causes the machine to perform operations comprising:
performing phase correlations between subsequent part segments and subsequent guide segments, the subsequent part segments and subsequent guide segments being located at the pre-determined increments; and
selecting the candidate offsets using the match threshold.
18. The article of manufacture of claim 15 wherein the data causing the machine to perform filtering the first offset and the candidate offsets comprise data that, when executed by the machine, causes the machine to perform operations comprising:
discarding a plurality of low and high extremes of the first offset and the candidate offsets; and
computing the guide-to-part offset as average of remaining offsets if the remaining offsets are within a pre-determined variation level.
19. The article of manufacture of claim 16 wherein the data causing the machine to perform locating the start location in the guide segment comprise data that, when executed by the machine, causes the machine to perform operations comprising:
if the guide segment is a first segment
skipping a tone if present, and
locating a first sample greater than a threshold level;
else if the guide segment is a subsequent segment
subtracting the guide-to-part offset from the part end of location to provide a difference, and
adding the difference with a time interval.