MPEG-DASH uses existing HTTP web server infrastructure that is used for delivery of essentially all World Wide Web content. MPEG-DASH should not be confused with a transport protocol - the transport protocol that MPEG-DASH uses is TCP. MPEG-DASH is the first adaptive bit-rate HTTP-based streaming solution that is an international standard. Thus, an MPEG-DASH client can seamlessly adapt to changing network conditions and provide high quality playback with fewer stalls or re-buffering events. The current MPEG-DASH reference client dash.js offers both buffer-based (BOLA) and hybrid (DYNAMIC) bit rate adaptation algorithms. While the content is being played back by an MPEG-DASH client, the client uses a bit rate adaptation (ABR) algorithm to automatically select the segment with the highest bit rate possible that can be downloaded in time for playback without causing stalls or re-buffering events in the playback. The content is made available at a variety of different bit rates, i.e., alternative segments encoded at different bit rates covering aligned short intervals of playback time. Similar to Apple's HTTP Live Streaming (HLS) solution, MPEG-DASH works by breaking the content into a sequence of small HTTP-based file segments, each segment containing a short interval of playback time of content that is potentially many hours in duration, such as a movie or the live broadcast of a sports event. The next 420x360x3 bytes afer that will represent the second frame, etc.Dynamic Adaptive Streaming over HTTP (DASH), also known as MPEG-DASH, is an adaptive bitrate streaming technique that enables high quality streaming of media content over the Internet delivered from conventional HTTP web servers. If the video has a size of 420x320 pixels, then the first 420x360x3 bytes outputed byįFMPEG will give the RGB values of the pixels of the first frame, line by line, top to bottom. Now we just have to read the output of FFMPEG. It can be omitted most of the time in Python 2 but not in Python 3 where its default value is pretty small. In sp.Popen, the bufsize parameter must be bigger than the size of one frame (see below).

The format image2pipe and the - at the end tell FFMPEG that it is being used with a pipe by another program. In the code above -i myHolidays.mp4 indicates the input file, while rawvideo/rgb24 asks for a raw RGB output. Import subprocess as sp command = pipe = sp.

Subprocess python ffmpeg