# US 7,349,944 B2 · System and method for record and playback of collaborative communications session > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,349,944 B2 - Document ID: US7349944B2 - Status: Granted - Kind: B2 - Application number: 11/140,303 - Filed: 2005-05-26 - Published: 2006-09-07 - Granted: 2008-03-25 - Earliest claimed: 1999-11-18 - Assignees: InterCall, Inc. - Inventors: Todd Vernon; Dan Jones; David Bradley Rust - Web page: https://patentgrep.com/patent/US7349944B2 ## CPC - H04L 65/1083: In-session procedures - H04L 65/403: Arrangements for multi-party communication, e.g. for conferences (data switching systems for conference H04L12/18; arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities H04M3/56; television conferencing systems H04N7/15) - H04L 67/02: based on web technology, e.g. hypertext transfer protocol [HTTP] - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A collaborative communication session (“session”), as created by the presenter and witnesses by one or more users on second computers, may be recorded. The session may be replayed by a user's computer, directing the audio and visual components of the browser on the user's computer as if the user was attending the live session. The recorded session replays the events of the live session in real time such that they playback experience contains the same audio and visual events that took place when the session was originally being recorded. Moreover, the recorded session may be encoded such that the session may be played back according to the client's playback capabilities, permissions and preferences. ## Claims ### Claim 1 A computer implemented method for recording a collaborative communications session comprising: at a first computer, sending a plurality of media type data used in said collaborative communication session to a recorder client; at said recorder client, preparing a file of said collaborative communications session configured for playback according to a second computer's processing capabilities, wherein the preparation of said file includes: encoding each of said plurality of media type data into a plurality of media type streams using a mixture of key frames and delta frames; and at a second computer, playing back said file by selecting at least one of the media type streams that matches the second computer's processing capabilities. ### Claim 2 (depends on 1) The computer implemented method of claim 1, wherein one or more of the plurality of the media type data is an audio data element. ### Claim 3 (depends on 1) The computer implemented method of claim 1, wherein one or more of the plurality the media type data is visual data element. ### Claim 4 (depends on 1) The computer implemented method of claim 1, wherein the key frame contains a complete copy of a buffer at a given point in time. ### Claim 5 (depends on 1) The computer implemented method of claim 1, wherein the delta frame is configured to include only changes to the buffer since a previously captured buffer. ### Claim 6 (depends on 1) The computer implemented method of claim 1 wherein the plurality of media data types are encoded, stored separately and later merged into the file. ### Claim 7 (depends on 1) The computer implemented method of claim 1 wherein one of the plurality of media data types comprises visual data elements that include images dynamically integrated into the collaborative communication session. ### Claim 8 (depends on 1) The computer implemented method of claim 1, wherein the processing capability is the bandwidth connection. ### Claim 9 (depends on 1) The computer implemented method of claim 1, wherein the processing capability is the media type applications available on said computer. ### Claim 10 (depends on 1) The computer implemented method of claim 1, wherein the preparation of said file further includes: recording each media type data as a separate track; and synchronizing and merging the plurality of media type streams. ### Claim 11 (depends on 10) The computer implemented method of claim 10, wherein the recording further includes recording the media type data such that on playback the media type of each media type stream can be determined and used to apply different processing to each according to media type. ### Claim 12 A method for recording a collaborative communications session, comprising: receiving a plurality of media type data from a collaborative communication session for recording; encoding each of the plurality of media type data into a plurality of media type streams using a mixture of full frames and delta frames; merging the plurality of media type streams into a file for playback, wherein the file is configured to allow a subset of the plurality of media type streams to play according to a playback device's processing capabilities. ### Claim 13 (depends on 12) The method of claim 12, wherein the at least one of the plurality of media type data is audio and at least one of the plurality of media type data is visual, and the subset of the media type streams played during playback comprises audio. ### Claim 14 (depends on 12) The method of claim 12, wherein the at least one of the plurality of media type data is audio and at least one of the plurality of media type data is visual, and the subset of the merged media type streams played during playback comprises audio and visual. ### Claim 15 A system for recording a collaborative communication session, comprising: a recorder client configured to receive a plurality of media type data from a collaborative communication session for recording; an encoder client coupled to said recorder client, the encoder client configured to encode each of the plurality of media type data into a plurality of media type streams using a mixture of full frames and delta frames; the encoder client further configured to merge the plurality of media type streams into a file for playback, wherein the file is configured to allow a subset of the plurality of media type streams to play according to a playback device's processing capabilities. ### Claim 16 (depends on 15) The system of claim 15, wherein the at least one of the plurality of media type data is audio and at least one of the plurality of media type data is visual, and the subset of the media type streams played during playback comprises audio. ### Claim 17 (depends on 15) The system of claim 15, wherein the at least one of the plurality of media type data is audio and at least one of the plurality of media type data is visual, and the subset of the merged media type streams played during playback comprises audio and visual.