Is it possible to reduce latency from safari or quicktime to cmaf low latency hls playback URL?

jungin.kim · August 12, 2024, 8:53am

I made a play URL based on cmaf ll-hls in wowza.

In the html5 player and the chrome hls player, it was seen that the latency was applied for 4 to 5 seconds.

However, the latency of safari, quicktime is still applied for 12 to 18 seconds.

Can’t save latency on default browser and quicktime with ccmafl-hls play url?

Or am I making the m3u8 wrong and it doesn’t apply?

(safari 15.1 version , mac)

Any help would be greatly appreciated… I’ve been struggling for 2 months.

Below is the m3u8 that I made.

#EXTM3U
#EXT-X-VERSION:6
#EXT-X-SERVER-CONTROL:CAN-BLOCK-RELOAD=YES,PART-HOLD-BACK=3.009,CAN-SKIP-UNTIL=42.0
#EXT-X-INDEPENDENT-SEGMENTS
#EXT-X-TARGETDURATION:7
#EXT-X-MEDIA-SEQUENCE:21
#EXT-X-PART-INF:PART-TARGET=1.0
#EXT-X-RENDITION-REPORT:URI="chunklist_b1000000_vo_sfm4s.m3u8",LAST-MSN=26,LAST-PART=0
#EXT-X-RENDITION-REPORT:URI="chunklist_b600000_vo_sfm4s.m3u8",LAST-MSN=26,LAST-PART=0
#EXT-X-RENDITION-REPORT:URI="chunklist_b96000_ao_sfm4s_sleng_t64RW5nbGlzaA==.m3u8",LAST-MSN=26,LAST-PART=0
#EXT-X-MAP:URI="header-u9f4vz01t_b800000_vo_sfm4s_m3u8.cmfv"
#EXT-X-PROGRAM-DATE-TIME:2024-08-09T06:49:13.781+00:00
#EXTINF:6.0,
media-u9f4vz01t_b800000_vo_sfm4s_21_m3u8.cmfv
#EXT-X-PROGRAM-DATE-TIME:2024-08-09T06:49:19.802+00:00
#EXTINF:6.0,
media-u9f4vz01t_b800000_vo_sfm4s_22_m3u8.cmfv
#EXT-X-PROGRAM-DATE-TIME:2024-08-09T06:49:25.759+00:00
#EXT-X-PART:DURATION=1.0,URI="media-u9f4vz01t_b800000_vo_sfm4s_23.0_m3u8.cmfv",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="media-u9f4vz01t_b800000_vo_sfm4s_23.1_m3u8.cmfv",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="media-u9f4vz01t_b800000_vo_sfm4s_23.2_m3u8.cmfv",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="media-u9f4vz01t_b800000_vo_sfm4s_23.3_m3u8.cmfv",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="media-u9f4vz01t_b800000_vo_sfm4s_23.4_m3u8.cmfv",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="media-u9f4vz01t_b800000_vo_sfm4s_23.5_m3u8.cmfv",INDEPENDENT=YES
#EXTINF:6.0,
media-u9f4vz01t_b800000_vo_sfm4s_23_m3u8.cmfv
#EXT-X-PROGRAM-DATE-TIME:2024-08-09T06:49:31.771+00:00
#EXT-X-PART:DURATION=1.0,URI="media-u9f4vz01t_b800000_vo_sfm4s_24.0_m3u8.cmfv",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="media-u9f4vz01t_b800000_vo_sfm4s_24.1_m3u8.cmfv",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="media-u9f4vz01t_b800000_vo_sfm4s_24.2_m3u8.cmfv",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="media-u9f4vz01t_b800000_vo_sfm4s_24.3_m3u8.cmfv",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="media-u9f4vz01t_b800000_vo_sfm4s_24.4_m3u8.cmfv",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="media-u9f4vz01t_b800000_vo_sfm4s_24.5_m3u8.cmfv",INDEPENDENT=YES
#EXTINF:6.0,
media-u9f4vz01t_b800000_vo_sfm4s_24_m3u8.cmfv
#EXT-X-PROGRAM-DATE-TIME:2024-08-09T06:49:37.729+00:00
#EXT-X-PART:DURATION=1.0,URI="media-u9f4vz01t_b800000_vo_sfm4s_25.0_m3u8.cmfv",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="media-u9f4vz01t_b800000_vo_sfm4s_25.1_m3u8.cmfv",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="media-u9f4vz01t_b800000_vo_sfm4s_25.2_m3u8.cmfv",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="media-u9f4vz01t_b800000_vo_sfm4s_25.3_m3u8.cmfv",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="media-u9f4vz01t_b800000_vo_sfm4s_25.4_m3u8.cmfv",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="media-u9f4vz01t_b800000_vo_sfm4s_25.5_m3u8.cmfv",INDEPENDENT=YES
#EXTINF:6.0,
media-u9f4vz01t_b800000_vo_sfm4s_25_m3u8.cmfv
#EXT-X-PROGRAM-DATE-TIME:2024-08-09T06:49:43.747+00:00
#EXT-X-PART:DURATION=1.0,URI="media-u9f4vz01t_b800000_vo_sfm4s_26.0_m3u8.cmfv",INDEPENDENT=YES
#EXT-X-PRELOAD-HINT:TYPE=PART,URI="media-u9f4vz01t_b800000_vo_sfm4s_26.1_m3u8.cmfv"

If the m3u8 file is wrong, please let me know why it is wrong

I’d appreciate it if you could recommend an ios native app to test the cmaf ll-hls playback URL generated by wowza.

If safari, quicktime basically doesn’t apply cmaf ll-hls, I’d really appreciate it if you could let me know what options or tasks I need to do when I develop an ios player.

Vihari_Kumar · August 28, 2025, 12:28pm

Hi,

This is common with Low-Latency HLS (LL-HLS). Native players like Safari and QuickTime prioritize smooth playback over minimal latency, so higher delays there are expected. The core reason for this discrepancy lies in how Apple’s native player, handles buffering. It’s designed to ensure uninterrupted playback, often filling a larger buffer to minimize the risk of stalls, which results in higher latency. This is an intentional design choice, not an issue with your stream’s manifest file.

To reduce the latency you’re seeing, you need to make adjustments. First, review the LL-HLS properties in your Wowza Streaming Engine application. You can find more details on these settings in the Deliver Low-Latency HLS live streams using Wowza Streaming Engine

By fine-tuning you should be able to achieve the low latency you are aiming for.

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Is it possible to reduce latency from safari or quicktime to cmaf low latency hls playback URL?

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