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16th April 2019, 12:59 | #1 | Link |
Registered User
Join Date: Feb 2003
Location: Palmcoast of Norway
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Apple HLS and x264 CRF VBR
hi, anyone got any experience on how strict the HLS protocol is on the VBR parts? By using CRF with a max cap, the avg and max values are way outside of the required HLS values.. Anyone got any experience here? For Web and Android its no problem, so if u have seen issues, do u have seperate ladders for each eco-system ?
br Te |
17th April 2019, 03:50 | #2 | Link |
Derek Prestegard IRL
Join Date: Nov 2003
Location: Los Angeles
Posts: 5,988
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The HLS authoring guidelines are one thing, and what devices are capable of is another.
I've typically adhered to capped VBR (e.g. maxrate = 1.1x bitrate and bufsize = 2x bitrate), but I know others do CRF + VBV with HLS with no problems. Apple generally has very good ABR algorithms, so I'd imagine this will all work pretty well. |
17th April 2019, 20:49 | #3 | Link |
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Location: Palmcoast of Norway
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ok thx!
110% variance is bearly outside the CBR domain... I just did a test on Han Solo from a Pro-res source@ CRF19 at 15mbps MAX cap, it ended up on 2.9mbps and 8.2 max peak... Unfortunately our plattform cant support HLS yet, so does anyone know of a good HLS reference player with backend where one can test ones test content ? (it will support it in 6mnths... ) |
18th April 2019, 01:34 | #4 | Link |
Derek Prestegard IRL
Join Date: Nov 2003
Location: Los Angeles
Posts: 5,988
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video.js is a very popular javascript player that supports HLS and DASH as well as DRM bindings via EME to whatever is supported on the browser.
bitmovin is a great commercial player with really nice people working on it I also know of THEOplayer and JWPlayer, but don't have experience with either. You can also just drop m3u8 playlists into safari on macOS and it will play |
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