Adaptive media transmission processing

1. A method comprising:

transmitting at least a portion of a video transmission comprising a plurality of frames organized as groups of frames, wherein the groups of frames comprise a first group of frames and a second group of frames separate from the first group of frames, and wherein each group of frames begins with a respective intra-coded frame that is encoded without reference to other frames of the plurality of frames, and wherein the first group of frames and the second group of frames each comprise a respective predictive frame and a respective bi-directionally predictive frame;

receiving an instruction to change a playback parameter of the video transmission;

determining a trick frame associated with the playback parameter, wherein the trick frame is in the first group of frames and encoded with reference to a second frame in the second group of frames, and wherein the trick frame is separated from the second frame by a number of frames related to the playback parameter; and

using at least the trick frame in response to the instruction to change the playback parameter of the video transmission.

2. The method of claim 1 , wherein the playback parameter comprises a playback direction.

3. The method of claim 1 , wherein the first group of frames is separated from the second group of frames by at least one third group of frames.

4. The method of claim 1 , wherein the second frame is an additional trick frame.

5. The method of claim 1 , wherein the trick frame belongs to a group of trick frames distributed at a regular interval throughout the video transmission, wherein the regular interval is related to the playback parameter.

6. The method of claim 1 , wherein the trick frame comprises information duplicated from another frame within the first group of frames.

7. The method of claim 1 , wherein the trick frame and the second frame are encrypted according to a first encryption key and at least one other frame of the first group of frames is encrypted according to a second encryption key.

8. A method comprising:

transmitting at least a portion of a video transmission comprising a plurality of frames organized as groups of frames, wherein the groups of frames comprise a first group of frames and a second group of frames separate from the first group of frames, and wherein each group of frames begins with a respective intra-coded frame that is encoded without reference to other frames of the plurality of frames, and wherein the first group of frames and the second group of frames each comprise a respective predictive frame and a respective bi-directionally predictive frame;

receiving an instruction to change a playback speed of the video transmission;

determining a trick frame associated with the playback speed, wherein the trick frame is in the first group of frames and encoded with reference to a second frame in the second group of frames, and wherein the trick frame is separated from the second frame by a number of frames related to the playback speed; and

using at least the trick frame in response to the instruction to change the playback speed of the video transmission.

9. The method of claim 8 , wherein receiving the instruction to change the playback speed of the video transmission comprises receiving a request from a user to change the playback speed.

10. The method of claim 8 , wherein the first group of frames is separated from the second group of frames by at least one third group of frames.

11. The method of claim 8 , wherein the second frame is an additional trick frame.

12. The method of claim 8 , wherein the trick frame belongs to a group of trick frames distributed at a regular interval throughout the video transmission, wherein the regular interval is related to the playback speed.

13. The method of claim 8 , wherein using at least the trick frame in response to the instruction to change the playback speed of the video transmission comprises transmitting the trick frame without transmitting all of the frames of the first group of frames.

14. The method of claim 8 , wherein the trick frame and the second frame are encrypted according to a first encryption key and at least one other frame of the first group of frames is encrypted according to a second encryption key.

15. A method comprising:

transmitting at least a portion of a video transmission comprising a plurality of frames organized as groups of frames, wherein the groups of frames comprise a first group of frames and a second group of frames separate from the first group of frames, and wherein each group of frames begins with a respective intra-coded frame that is encoded without reference to other frames of the plurality of frames, and wherein the first group of frames and the second group of frames each comprise a respective predictive frame and a respective bi-directionally predictive frame;

determining to change a playback resolution of the video transmission;

determining a trick frame associated with the playback resolution, wherein the trick frame is in the first group of frames and encoded with reference to the second frame in the second group of frames, and wherein the trick frame is separated from the second frame by a number of frames related to the playback resolution; and

using at least the trick frame in response to the determining to change the playback resolution of the video transmission.

16. The method of claim 15 , wherein determining to change the playback resolution of the video transmission comprises determining that a user receiving the video transmission is passively watching or not watching rendering of the video transmission.

17. The method of claim 15 , wherein the first group of frames is separated from the second group of frames by at least one third group of frames.

18. The method of claim 15 , wherein the second frame is an additional trick frame.

19. The method of claim 15 , wherein the trick frame belongs to a group of trick frames distributed at a regular interval throughout the video transmission, wherein the regular interval is related to the playback resolution.

20. The method of claim 15 , wherein using at least the trick frame in response to the determining to change the playback resolution of the video transmission comprises transmitting the trick frame without transmitting all of the frames of the first group of frames.