Systems and methods for real-time adaptive bitrate transcoding and transmission of transcoded media
Methods and systems are provided for streaming a media asset with an adaptive bitrate transcoder. A server receives, from a client device, a first request for a first portion of the plurality of portions to be transcoded at a first bitrate. The server then starts to transcode the plurality of portions at the requested first bitrate to generate a plurality of corresponding transcoded portions. The server updates a header of a transcoded portion to include: 1) a transcode latency value; and 2) a count value indicating a number of available pre-transcoded portions of the media asset at the time the first request was received. The server then transmits the transcoded portion to the client. The client device then determines a second bitrate based on the transcode latency value included in the header of the transcoded portion corresponding to the first portion.
1. A method comprising:
receiving, from a client device, a first request for a first portion of a plurality of portions of a media asset to be transcoded at a first bitrate;
in response to receiving the first request, transcoding the first portion of the plurality of portions at the first bitrate;
updating a header of a transcoded portion of a plurality of transcoded portions corresponding to the first portion of the plurality of portions of the media asset to comprise a transcode latency value;
transmitting the transcoded portion corresponding to the first portion of the plurality of portions of the media asset at the first bitrate to the client device; and
receiving, from the client device, a client request for a second portion of the plurality of portions of the media asset to be transcoded at a second bitrate,
wherein the second bitrate is determined based on the transcode latency value included in the header of the transcoded portion corresponding to the first portion,
wherein the second bitrate based on the transcode latency value is determined based on an observed bandwidth,
wherein the observed bandwidth is based on an amount of data contained in the transcoded portion corresponding to the first portion and a final latency value,
wherein the final latency value is based on an analysis of a preliminary latency value and the transcode latency value,
wherein the preliminary latency value is based on an analysis of a second time value and a first time value,
wherein the first time value represents a time at which the first request was transmitted by the client device, and
wherein the second time value represents a time at which the transcoded portion corresponding to the first portion was received by the client device.
2. The method of claim 1 , further comprising:
calculating the transcode latency value by:
determining a third time value representing a time at which the first request was received;
determining a fourth time value representing a time at which transcoding at the first bitrate was started; and
analyzing the fourth time value and the third time value.
3. The method of claim 1 , further comprising:
updating the header of the transcoded portion of the plurality of transcoded portions corresponding to the first portion of the plurality of portions of the media asset to further comprise a count value indicating a number of available pre-transcoded portions of the media asset at a time the first request was received, and
wherein the client request was transmitted at a time determined based on the count value included in the header of the transcoded portion corresponding to the first portion.
4. The method of claim 3 , further comprising:
storing transcoded portions in a chunk buffer prior to transmitting the transcoded portion to the client device; and
wherein the count value indicates a number of transcoded portions of the media asset stored in the chunk buffer.
5. The method of claim 3 , wherein a subset of the plurality of portions comprises a complete segment of the media asset, and
wherein the time determined for transmission of the client request based on the count value is based on whether a first amount of data represented by the count value is greater than a second amount of data comprising a complete transcoded segment at the first bitrate.
6. A system comprising:
input/output circuitry configured to:
receive, from a client device, a first request for a first portion of a plurality of portions of a media asset to be transcoded at a first bitrate; and
control circuitry configured to:
in response to receiving the first request, transcode the first portion of the plurality of portions at the first bitrate;
update a header of a transcoded portion of a plurality of transcoded portions corresponding to the first portion of the plurality of portions of the media asset to comprise a transcode latency value,
wherein the input/output circuitry is further configured to:
transmit the transcoded portion corresponding to the first portion of the plurality of portions of the media asset at the first bitrate to the client device; and
receive, from the client device, a client request for a second portion of the plurality of portions of the media asset to be transcoded at a second bitrate,
wherein the second bitrate is determined based on the transcode latency value included in the header of the transcoded portion corresponding to the first portion,
wherein the second bitrate based on the transcode latency value is determined based on an observed bandwidth,
wherein the observed bandwidth is based on an amount of data contained in the transcoded portion corresponding to the first portion and a final latency value,
wherein the final latency value is based on an analysis of a preliminary latency value and the transcode latency value,
wherein the preliminary latency value is based on an analysis of a second time value and a first time value,
wherein the first time value represents a time at which the first request was transmitted by the client device, and
wherein the second time value represents a time at which the transcoded portion corresponding to the first portion was received by the client device.
7. The system of claim 6 , wherein the control circuitry is further configured to calculate the transcode latency value by:
determining a third time value representing a time at which the first request was received;
determining a fourth time value representing a time at which transcoding at the first bitrate was started; and
analyzing the fourth time value and the third time value.
8. The system of claim 6 , wherein the control circuitry is further configured to:
update the header of the transcoded portion of the plurality of transcoded portions corresponding to the first portion of the plurality of portions of the media asset to further comprise a count value indicating a number of available pre-transcoded portions of the media asset at a time the first request was received, and
wherein the client request was transmitted at a time determined based on the count value included in the header of the transcoded portion corresponding to the first portion.
9. The system of claim 8 , wherein the control circuitry is further configured to:
store transcoded portions in a chunk buffer prior to transmitting the transcoded portion to the client device; and
wherein the count value indicates a number of transcoded portions of the media asset stored in the chunk buffer.
10. The system of claim 8 , wherein a subset of the plurality of portions comprises a complete segment of the media asset, and
wherein the time determined for transmission of the client request based on the count value is based on whether a first amount of data represented by the count value is greater than a second amount of data comprising a complete transcoded segment at the first bitrate.