[FFmpeg-trac] #9205(undetermined:new): Incorrect segment length in HLS child playlist

FFmpeg trac at avcodec.org
Wed Apr 28 09:46:50 EEST 2021 

#9205: Incorrect segment length in HLS child playlist
-------------------------------------+-------------------------------------
             Reporter:  Yash         |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:

 I am creating an HLS stream with two resolutions using NVIDIA x264
 hardware encoder and FFmpeg is generating a segment with 0 bytes length
 after init segment in each video child playlist. An example of a child
 playlist is given below.
 How to reproduce:
 {{{
 % ffmpeg -loglevel verbose -hide_banner -vsync 0 -hwaccel cuvid
 -hwaccel_output_format cuda -c:v h264_cuvid -i wanted_1080p.mp4 -y
 -filter_complex
 "[0:v]hwdownload,format=nv12[0_v_cpu];[0_v_cpu]colorspace=irange=tv:range=tv:ispace=smpte170m:space=bt709:itrc=smpte170m:trc=bt709:iprimaries=smpte170m:primaries=bt709[init_processed];[init_processed]split=2[360p][720p];[360p]hwupload_cuda,scale_npp=640:360:interp_algo=lanczos[360pScaled];[720p]hwupload_cuda,scale_npp=1280:720:interp_algo=lanczos[720pScaled]"
 -hls_list_size 0 -hls_playlist_type vod -hls_flags
 single_file+independent_segments -hls_segment_type fmp4
 -hls_segment_filename %v.mp4 -hls_time 2 -master_pl_name 1.m3u8 -preset:v
 slow -tune:v hq -qmin:v 0 -bf:v 3 -b_ref_mode:v 2 -temporal_aq:v 1
 -i_qfactor:v 0.75 -b_qfactor:v 1.1 -color_primaries:v bt709 -color_trc:v
 bt709 -colorspace:v bt709 -color_range:v tv -g:v 48 -keyint_min:v 48
 -forced-idr:v 1 -rc-lookahead:v 0 -no-scenecut:v 1 -map "[360pScaled]"
 -map "[720pScaled]" -map 0:a:0 -map 0:a:0 -c:v:0 h264_nvenc -c:v:1
 h264_nvenc -b:v:0 1499k -b:v:1 2998k -maxrate:v:0 1499k -maxrate:v:1 2998k
 -bufsize:v:0 2998k -bufsize:v:1 5996k -c:a:0 aac -c:a:1 aac -b:a:0 96k
 -b:a:1 128k -var_stream_map
 "v:0,agroup:audio_96k,name:6088fbd10daf052b6b4770cb_0
 v:1,agroup:audio_128k,name:6088fbd10daf052b6b4770cb_1
 a:0,agroup:audio_96k,name:6088fbd10daf052b6b4770cb_en_96k,language:en
 a:1,agroup:audio_128k,name:6088fbd10daf052b6b4770cb_en_128k,language:en"
 -f hls %v.m3u8
 ffmpeg version 4.4
 built on ...
 Ubuntu 20.04 5.8.0-50-generic
 CUDA 11.1
 Video Codec SDK version 11.0.10.
 NVIDIA Driver Version: 460.73.01
 }}}
 6088fbd10daf052b6b4770cb_0.m3u8
 {{{
 #EXTM3U
 #EXT-X-VERSION:7
 #EXT-X-TARGETDURATION:2
 #EXT-X-MEDIA-SEQUENCE:0
 #EXT-X-PLAYLIST-TYPE:VOD
 #EXT-X-INDEPENDENT-SEGMENTS
 #EXT-X-MAP:URI="6088fbd10daf052b6b4770cb_0.mp4",BYTERANGE="450404 at 0"
 #EXTINF:2.000000,
 #EXT-X-BYTERANGE:0 at 450404
 6088fbd10daf052b6b4770cb_0.mp4
 #EXTINF:2.000000,
 #EXT-X-BYTERANGE:359407 at 450404
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 #EXTINF:2.000000,
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 #EXTINF:2.000000,
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 #EXTINF:2.000000,
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 #EXTINF:2.000000,
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 #EXTINF:2.000000,
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 #EXTINF:2.000000,
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 #EXTINF:2.000000,
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 }}}
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9205>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker

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