Frame conversion for adaptive streaming alignment

A method for generating an output audio/video bitstream, including steps of:

• (a) providing frames, where at least one of the frames is a hybrid frame including at least one chunk of data useful for determining a P-frame and an I-frame, where the I-frame is indicative of an encoded version of content and the P-frame is indicative of a differently encoded version of the content, and where each of the frames is indicative of audio content or video content;
• and
• (b) generating the output audio/video bitstream, including by synthesizing at least one I-frame or P-frame using at least one said chunk of data of at least one said hybrid frame, thereby generating at least one synthesized frame, and including each said synthesized frame in the output audio/video bitstream, such that the output audio/video bitstream includes a segment which starts with an I-frame and includes at least one synthesized P-frame following the I-frame, or starts with a synthesized I-frame and includes at least one P-frame following the synthesized I-frame.