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  • Command Line 'hls_segment_size' creates TS files with segment failures

    14 octobre 2019, par Phantom

    I am converting a simple mp4 video to hls but I need the segments to be in approximately a specific size

    I researched and found :

    -hls_segment_size 17000000

    17000000 bytes( 17MB)

    This creates TS files with approximate sizes, (does not have to be exact size)

    ffmpeg.exe -i "in.mp4" -vcodec copy -acodec aac -hls_list_size 0 -hls_segment_size 17000000 -f hls "out.m3u8"

    In the m3u8 file is created ’#EXT-X-BYTERANGE’, which is the way I want it

    #EXTM3U
    
#EXT-X-VERSION:4
    
#EXT-X-TARGETDURATION:10
    
#EXT-X-MEDIA-SEQUENCE:0
    
#EXTINF:8.400000,
    
#EXT-X-BYTERANGE:1662108@0
    
SampleVideo_1280x720_30mb0.ts
    
#EXTINF:4.560000,
    
#EXT-X-BYTERANGE:383896@0
    
SampleVideo_1280x720_30mb1.ts
    
#EXTINF:3.120000,
    
#EXT-X-BYTERANGE:408712@383896
    
SampleVideo_1280x720_30mb1.ts
    
#EXTINF:5.640000,
    
#EXT-X-BYTERANGE:1161840@0
    
SampleVideo_1280x720_30mb2.ts
    
#EXTINF:1.880000,
    
#EXT-X-BYTERANGE:230864@0
    
SampleVideo_1280x720_30mb3.ts
    
#EXTINF:2.160000,
    
#EXT-X-BYTERANGE:330880@230864
    
SampleVideo_1280x720_30mb3.ts
    
#EXTINF:2.080000,
    
#EXT-X-BYTERANGE:489928@0
    
SampleVideo_1280x720_30mb4.ts
    
#EXTINF:4.400000,
    
#EXT-X-BYTERANGE:1564348@489928
    
SampleVideo_1280x720_30mb4.ts
    
...

    It seems alright, but it has a little problem. I’m testing on a player in the browser, and when the seconds goes from one segment to the other the video has a lock in sound and video. Something very annoying, not natural in the video.

    Not using ’-hls_segment_size’ will have functional TS files, and without BYTERANGE in the m3u8 file

    However, the size of the TS file will be according to the seconds defined

    I am currently trying to get a ts file that is close to a size set between 15MB and 20MB, and have BYTERANGE in the m3u8 file.

    Does anyone have any ideas ?

    here’s the problem I’m trying to describe :

    http://phantsc.rf.gd/AAA/Bbb.html

    exactly in the second 7 of the video a ’locking’ happens, this happens when going from one segment to another

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