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Wojciech Przybyl - Efficient Trick Modes with MPEG-DASH.pdf
- 1. Berlin 10/10/2016 Efficient TrickModes in MPEG-DASH Adaptive Streaming with GStreamer Visla Systems Ltd Wojciech Przybyl
- 2. - New togst community - 10+ years experience in Linux & Media products development - SetTopBox & DVR development - SoC: ST / Broadcom / TI / Freescale ABOUT VISLA SYSTEMS ADAPTIVE STREAMING CLASSIC TRICK MODES EFFICIENT TRICK MODES DEMO Q & A
- 3. MPEG-DASH - DynamicAdaptive Streaming over HTTP - Codec agnostic: H.264, H.265, VP8, VP9, PCM, AAC, AC-3, DTS etc. - Containers: MPEG-2 TS, ISOBMFF (MP4) - Independent downloadable fragments 1-5 sec long - Adaptive bitrate & framerate - Streams download over HTTP 1.1 ABOUT VISLA SYSTEMS ADAPTIVE STREAMING CLASSIC TRICK MODES EFFICIENT TRICK MODES DEMO Q & A
- 4. Simple MPEG-DASH pipelinein GStreamer ABOUT VISLA SYSTEMS ADAPTIVE STREAMING CLASSIC TRICK MODES EFFICIENT TRICK MODES DEMO Q & A
- 5. gst-launch-1.0 souphttpsrc !dashdemux ! qtdemux ! queue ! h264parse ! avdec_h264 ! autovideosink ABOUT VISLA SYSTEMS ADAPTIVE STREAMING CLASSIC TRICK MODES EFFICIENT TRICK MODES DEMO Q & A
- 6. - Trick Modes:Speed and Direction != x1 - Gstreamer API: gst_event_new_seek() - Judging Trick Modes - efficiency - user experience - complexity - cost ABOUT VISLA SYSTEMS ADAPTIVE STREAMING CLASSIC TRICK MODES EFFICIENT TRICK MODES DEMO Q & A
- 7. Simple Trick Modes -Play it all but faster - Download all - Decode all - Discard frames in a sink element ABOUT VISLA SYSTEMS ADAPTIVE STREAMING CLASSIC TRICK MODES EFFICIENT TRICK MODES DEMO Q & A
- 8. Simple Trick Modes ABOUT VISLASYSTEMS ADAPTIVE STREAMING CLASSIC TRICK MODES EFFICIENT TRICK MODES DEMO Q & A
- 9. - Local playbackwith low speed is OK - What about the bandwidth? - What about higher speeds: x30? ABOUT VISLA SYSTEMS ADAPTIVE STREAMING CLASSIC TRICK MODES EFFICIENT TRICK MODES DEMO Q & A
- 10. - Efficiency: None/ Impossible - User Experience: Perfect until it hits the limit - Complexity: Simple - Cost: Low ABOUT VISLA SYSTEMS ADAPTIVE STREAMING CLASSIC TRICK MODES EFFICIENT TRICK MODES DEMO Q & A
- 11. Pause & SeekTrick Modes Pause Playback → Seek&Flush Download Decode Present ← Repeat ABOUT VISLA SYSTEMS ADAPTIVE STREAMING CLASSIC TRICK MODES EFFICIENT TRICK MODES DEMO Q & A
- 12. Pause and Seek ABOUT VISLASYSTEMS ADAPTIVE STREAMING CLASSIC TRICK MODES EFFICIENT TRICK MODES DEMO Q & A
- 13. - Efficiency: Moderate -User Experience: Moderate - Complexity: Moderate - Cost: Low ABOUT VISLA SYSTEMS ADAPTIVE STREAMING CLASSIC TRICK MODES EFFICIENT TRICK MODES DEMO Q & A
- 14. Key frames onlyTrick Modes - Download key frames only - Perform the rest as in Simple Tick Mode ABOUT VISLA SYSTEMS ADAPTIVE STREAMING CLASSIC TRICK MODES EFFICIENT TRICK MODES DEMO Q & A
- 15. Key frames only ABOUT VISLASYSTEMS ADAPTIVE STREAMING CLASSIC TRICK MODES EFFICIENT TRICK MODES DEMO Q & A
- 16. - Every DASHfragment starts with a key frame - Add sidx&ssix box and use HTTP GET RANGE request - Should we add more I frames when reencoding? - qtdemux is behind dashdemux ABOUT VISLA SYSTEMS ADAPTIVE STREAMING CLASSIC TRICK MODES EFFICIENT TRICK MODES DEMO Q & A
- 17. - Efficiency: High -User Experience: Moderate / Poor - Complexity: High - Cost: Low ABOUT VISLA SYSTEMS ADAPTIVE STREAMING CLASSIC TRICK MODES EFFICIENT TRICK MODES DEMO Q & A
- 18. Efficient Trick Modes -Download separate (Sub)Representation per speed holding only&all the frames which are going to be presented - Perform the rest as in Simple Trick Mode - Frames discarding is done during stream encoding ABOUT VISLA SYSTEMS ADAPTIVE STREAMING CLASSIC TRICK MODES EFFICIENT TRICK MODES DEMO Q & A
- 19. Efficient Trick Modes ABOUT VISLASYSTEMS ADAPTIVE STREAMING CLASSIC TRICK MODES EFFICIENT TRICK MODES DEMO Q & A
- 20. - Bandwidth &Processing Power for speed x5 is the same as at speed x1 - Image quality stays (almost) the same - Bitrate per frame at speed x5 is the same as at speed x1 ABOUT VISLA SYSTEMS ADAPTIVE STREAMING CLASSIC TRICK MODES EFFICIENT TRICK MODES DEMO Q & A
- 21. - Image qualitystays (almost) the same - Why almost? - True for speed x1 vs x5 - Almost true for speed x1 vs x30 → Stream is I frames only ABOUT VISLA SYSTEMS ADAPTIVE STREAMING CLASSIC TRICK MODES EFFICIENT TRICK MODES DEMO Q & A
- 22. Status - Proof ofConcept stage done - Choosing correct (Sub)Representation might be tricky - Manifest's attributes: @bandwidth @frameRate @MaxPlayoutRate ABOUT VISLA SYSTEMS ADAPTIVE STREAMING CLASSIC TRICK MODES EFFICIENT TRICK MODES DEMO Q & A
- 23. - Efficiency: Perfect -User Experience: Perfect - Complexity: Moderate - Cost: High Cost = (Storage+Encoding+Packaging+Encryption) * N bitrates * M fps substreams +Delivery ABOUT VISLA SYSTEMS ADAPTIVE STREAMING CLASSIC TRICK MODES EFFICIENT TRICK MODES DEMO Q & A
- 24.
- 25. Questions and (hopefully)Answers ABOUT VISLA SYSTEMS ADAPTIVE STREAMING CLASSIC TRICK MODES EFFICIENT TRICK MODES DEMO Q & A
- 26.