Detection of failures in advertisement replacement
Methods of monitoring segment replacement within a multimedia stream are provided. A multimedia stream having a replacement segment spliced therein is evaluated by extracting at least one of video, text, and audio features from the multimedia stream adjacent a beginning or ending of the replacement segment, and the extracted features are analyzed to detect if a residual of a segment replaced by the replacement segment exists within the multimedia stream. Methods of ad replacement and a system for performing the above methods are also disclosed.
1. A method of monitoring segment replacement within a multimedia stream, comprising steps of:
evaluating a multimedia stream having a replacement segment spliced therein, the evaluating step including extracting at least one of video, text, and audio features from the multimedia stream adjacent a beginning or ending of the replacement segment;
analyzing the features to detect if a residual of a segment replaced by the replacement segment exists within the multimedia stream; and
determining a boundary within the multimedia stream between the replacement segment and an adjacent segment in the multimedia stream;
wherein the multimedia stream is analyzed during the analyzing step to determine if a hard cut transition is present within a predetermined period of video before or after the boundary, and wherein the analyzing step includes comparing text in closed captioning before the hard cut transition and after the hard cut transition.
2. The method according to claim 1 , further comprising the step of generating an alert if the residual of the segment replaced by the replacement segment is detected within the multimedia stream during the analyzing step.
3. The method according to claim 1 , further comprising the step of generating quality assessment statistics based on results of the analyzing step concerning accuracy of splicing location of the replacement segment in the multimedia stream.
4. The method according to claim 1 , further comprising the step of automatically correcting video frames in the multimedia stream adjacent the replacement segment if the replacement segment is detected as being offset from an intended position within the multimedia stream during the analyzing step.
5. The method according to claim 4 , wherein said step of automatically correcting video frames includes replacing video frames of the residual with at least one of black video frames, marker frames, frames repeating a last video frame of an adjacent segment, and video frames with a fading effect.
6. The method according to claim 1 , wherein the step of determining the boundary includes at least one of detecting for sequences including black frames and silent audio, detecting for sequences of visually distinct marker frames, and comparing the multimedia stream having the replacement segment with a previous version of the multimedia stream including the segment intended for replacement by the replacement segment.
7. The method according to claim 1 , wherein the analyzing step includes detecting differences between at least one of audio, video and text features of the multimedia stream during the predetermined period and at least one of audio, video and text features of the multimedia stream directly preceding or following the predetermined period.
8. The method according to claim 1 , wherein video features are extracted from the multimedia stream and include at least one of a Color Layout Descriptor (CLD), a color histogram, and an Edge Histogram Descriptor (EHD).
9. The method according to claim 1 , wherein audio features corresponding to statistics of Mel Frequency Cepstrum Coefficients (MFCC) are extracted from the multimedia stream.
10. A method of segment replacement within a multimedia stream, comprising steps of:
evaluating a multimedia stream by extracting at least one of video, text, and audio features from the multimedia stream adjacent a location within the multimedia stream;
analyzing the features to detect for at least one of a segment boundary and a splicing point within the multimedia stream; and
splicing a replacement segment within the multimedia stream following the segment boundary or at the splicing point;
wherein the location is a splicing point and the features are extracted from a predetermined period before and following the splicing point, wherein the features are evaluated to determine a presence of a hard cut transition within the predetermined periods, and wherein the splicing point is adjusted if the hard cut transition is detected in the predetermined periods.
11. The method according to claim 10 , further comprising the steps of defining a plurality of candidate locations within the multimedia stream which represent at least one of a starting point and ending point of a segment to be replaced within the multimedia stream, and selecting at least one of the candidate locations as a segment boundary based on the analyzing step.
12. An advertisement replacement system comprising one or more processors configured for digital video processing of a multimedia stream, the one or more processors further configured to provide:
an advertisement detector configured to receive the multimedia stream;
a splicer configured to receive information from the advertisement detector; and
a media analyzer configured to evaluate the multimedia stream at one of before, during, and after advertisement replacement, the media analyzer being configured to extract at least one of video, text, and audio features from the multimedia stream and analyze the features for determining at least one of a segment boundary, a splicing point, and an offset of advertisement replacement;
wherein the media analyzer is configured to extract at least one of video, audio, and text features from predetermined periods before and following a splicing point within the multimedia stream to determine a presence of a hard cut transition within the predetermined periods, and to adjust the splicing point if the hard cut transition is detected in the predetermined periods.
13. The advertisement replacement system according to claim 12 , wherein the media analyzer is configured to receive a multimedia stream having a replacement segment spliced therein, extract at least one of video, text, and audio features from the multimedia stream adjacent a beginning or ending of the replacement segment, and analyze the features to detect if a residual of a segment replaced by the replacement segment exists within the multimedia stream.
14. The advertisement replacement system according to claim 13 , wherein the media analyzer is configured to accomplish at least one of generating an alert if the residual of the segment replaced by the replacement segment is detected within the multimedia stream, generating quality assessment statistics concerning accuracy of splicing location of the replacement segment in the multimedia stream, and automatically correcting video frames in the multimedia stream adjacent the replacement segment if the replacement segment is detected as being offset from an intended position within the multimedia stream.
15. The advertisement replacement system according to claim 12 , wherein the media analyzer is configured to analyze a plurality of candidate locations within the multimedia stream which represent at least one of a starting point and ending point of a segment to be replaced within the multimedia stream and select at least one of the candidate locations as a segment boundary.