Server side crossfading for progressive download media
In exemplary embodiments of the present invention systems and methods are provided to implement and facilitate cross-fading, interstitials and other effects/processing of two or more media elements in a personalized media delivery service so that each client or user has a consistent high quality experience. The effects or crossfade processing can occur on the broadcast, publisher or server-side, but can still be personalized to a specific user, thus still allowing a personalized experience for each individual user, in a manner where the processing burden is minimized on the downstream side or client device. This approach enables a consistent user experience, independent of client device capabilities, both static and dynamic. The cross-fade can be implemented after decoding the relevant chunks of each component clip, processing, recoding and rechunking, or, in a preferred embodiment, the cross-fade or other effect can be implemented on the relevant chunks to the effect in the compressed domain, thus obviating any loss of quality by re-encoding. A large scale personalized content delivery service can be implemented by limiting the processing to essentially the first and last chunks of any file, since there is no need to processing the full clip. In exemplary embodiments of the present invention this type of processing can easily be accommodated in cloud computing technology, where the first and last files may be conveniently extracted and processed within the cloud to meet the required load. Processing may also be done locally, for example, by the broadcaster, with sufficient processing power to manage peak load.
1. A method for implementing a server side crossfade or other transitional effect, the method comprising:
identifying a plurality of media clips to use in the effect;
determining, for each of the plurality of clips, multiple chunks to process for the effect;
receiving the multiple chunks at a compressed crossfade module; and
combining compressed data from each of the multiple chunks to generate a revised chunk containing the compressed data;
wherein the revised chunk is equal in quality to the plurality of media clips.
2. The method of claim 1 , further comprising creating a new index file for the revised chunk.
3. The method of claim 1 , wherein the determining is performed via an algorithm that assesses the number of chunks to process for the effect.
4. The method of claim 3 , wherein the algorithm inputs at least one of the following as parameters: (i) intra and outro information of each of the plurality of clips; (ii) type of the effect, and (iii) audio trajectory of the effect.
5. A non-transitory computer readable medium containing instructions that, when executed by at least one processor of a computing devices, cause the computing device to:
identify a plurality of media clips to use in an effect;
determine, for each of the plurality of clips, multiple chunks to process for the effect;
receive the multiple chunks at a compressed crossfade module; and
combine compressed data from each of the multiple chunks to generate a revised chunk containing the compressed data;
wherein the revised chunk is equal in quality to the plurality of media clips.
6. The non-transitory computer readable medium of claim 5 , further comprising instructions that, when executed by the at least one processor, cause the computing device to create a new index file for the revised chunk.
7. The non-transitory computer readable medium of claim 5 , wherein the determining is performed via an algorithm that assesses the number of chunks to process for the effect.
8. The non-transitory computer readable medium of claim 7 , wherein the algorithm inputs at least one of the following parameters: (i) intra and outro information of each of the plurality of clips; (ii) type of the effect, and (iii) audio trajectory of the effect.