multiple calls of Movmuxer.writeMoov panics

[iMro0t]

multiple calls of Movmuxer.writeMoov panics

[yapingcat]

sorry. i can't get the point of ’multiple calls‘, In which scenario, writeMoov is called multiple times?

[iMro0t]

in my case i was writing init segment with Movmuxer.WriteInitSegment function in different file and then Movmuxer.Write is internally calling Movmuxer.writeMoov

[yapingcat]

in your case ,fmp4 is used for hls ? and do you create mov muxer with MP4_FLAG_FRAGMENT ?

if you use MP4_FLAG_FRAGMENT , you should not call the WriteInitSegment function, mp4 library write moov box Automatically

[iMro0t]

in your case ,fmp4 is used for hls ?

Yes

do you create mov muxer with MP4_FLAG_FRAGMENT ?

Yes

mp4 library write moov box Automatically

it writes moov box but its only writing in first segment. maybe in this case OnFragment callback will be helpful so on first OnFragment callback we can save it to init fragment and rest is for fmp4

[yapingcat]

you should use MP4_FLAG_DASH flag for hls. refer to hls fmp4
for hls,the best way is to save moov box in EXT-X-MAP, write moov into every segment is unnecessary

[iMro0t]

gomedia/example/example_convert_flv_to_hls_fmp4.go

Lines 78 to 83 in bc994fe

	if i == 0 {
	initFile, _ := os.OpenFile("init.mp4", os.O_CREATE|os.O_RDWR, 0666)
	muxer.WriteInitSegment(initFile)
	initFile.Close()
	hls.initUri = "init.mp4"
	}

the example code also calls muxer.WriteInitSegment which may lead to this error too

[yapingcat]

muxer, err = mp4.CreateMp4Muxer(mp4file, mp4.WithMp4Flag(mp4.MP4_FLAG_DASH))

if mp4 muxer is created with MP4_FLAG_DASH , the writeMoov function will not been called in mp4 library.

so writeMoov is only called when you call WriteInitSegment,it won't trigger multiple calls