I use the m3u8 to test lhls on safari,but the PART-HOLD-BACK can not work.
what's the problem
m3u8 :
#EXTM3U
#EXT-X-VERSION:6
#EXT-X-ALLOW-CACHE:NO
#EXT-X-TARGETDURATION:10
#EXT-X-PART-INF:PART-TARGET=1.0
#EXT-X-SERVER-CONTROL:PART-HOLD-BACK=12.0
#EXT-X-MEDIA-SEQUENCE:1614154227
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154227.ts",BYTERANGE="411908@0",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154227.ts",BYTERANGE="409276@411908"
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154227.ts",BYTERANGE="437476@821184",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154227.ts",BYTERANGE="383708@1258660"
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154227.ts",BYTERANGE="545388@1642368",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154227.ts",BYTERANGE="488800@2187756"
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154227.ts",BYTERANGE="585432@2676556",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154227.ts",BYTERANGE="402696@3261988"
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154227.ts",BYTERANGE="405516@3664684",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154227.ts",BYTERANGE="365284@4070200"
#EXTINF:10.000,
/atest.lhls.com/stage/testhls03-1614154227.ts
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154228.ts",BYTERANGE="445184@0",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154228.ts",BYTERANGE="379760@445184"
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154228.ts",BYTERANGE="422812@824944",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154228.ts",BYTERANGE="383144@1247756"
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154228.ts",BYTERANGE="393860@1630900",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154228.ts",BYTERANGE="354192@2024760"
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154228.ts",BYTERANGE="389160@2378952",INDEPENDENT=YES
what's the problem
m3u8 :
#EXTM3U
#EXT-X-VERSION:6
#EXT-X-ALLOW-CACHE:NO
#EXT-X-TARGETDURATION:10
#EXT-X-PART-INF:PART-TARGET=1.0
#EXT-X-SERVER-CONTROL:PART-HOLD-BACK=12.0
#EXT-X-MEDIA-SEQUENCE:1614154227
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154227.ts",BYTERANGE="411908@0",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154227.ts",BYTERANGE="409276@411908"
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154227.ts",BYTERANGE="437476@821184",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154227.ts",BYTERANGE="383708@1258660"
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154227.ts",BYTERANGE="545388@1642368",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154227.ts",BYTERANGE="488800@2187756"
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154227.ts",BYTERANGE="585432@2676556",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154227.ts",BYTERANGE="402696@3261988"
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154227.ts",BYTERANGE="405516@3664684",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154227.ts",BYTERANGE="365284@4070200"
#EXTINF:10.000,
/atest.lhls.com/stage/testhls03-1614154227.ts
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154228.ts",BYTERANGE="445184@0",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154228.ts",BYTERANGE="379760@445184"
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154228.ts",BYTERANGE="422812@824944",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154228.ts",BYTERANGE="383144@1247756"
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154228.ts",BYTERANGE="393860@1630900",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154228.ts",BYTERANGE="354192@2024760"
#EXT-X-PART:DURATION=1.0,URI="/atest.lhls.com/stage/testhls03-1614154228.ts",BYTERANGE="389160@2378952",INDEPENDENT=YES