[FFmpeg-trac] #6457(ffmpeg:new): Encrypted HLS - wrong ranges in .m3u8 file

Tue Jun 13 12:06:06 EEST 2017

#6457: Encrypted HLS - wrong ranges in .m3u8 file
-------------------------------------+-------------------------------------
             Reporter:  d3im         |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  ffmpeg       |                  Version:
             Keywords:  HLS ffmpeg   |  unspecified
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
-------------------------------------+-------------------------------------
 Summary of the bug:
 How to reproduce:
 {{{
 % ffmpeg -i input.mp4 -c:v libx264 -crf 28 -profile high -level 41
 -keyint_min 25 -c:a libfdk_aac -vbr 1 -hls_time 6 -hls_list_size 0
 '''-hls_flags single_file''' -hls_playlist_type vod -hls_key_info_file
 file.keyinfo -f hls fftest/cle.m3u8

 ffmpeg version 3.3.2 Copyright (c) 2000-2017 the FFmpeg developers
 built with gcc 5.4.0 (Gentoo 5.4.0-r3 p1.3, pie-0.6.5)
 configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64
 --docdir=/usr/share/doc/ffmpeg-3.3.2/html --mandir=/usr/share/man
 --enable-shared --cc=x86_64-pc-linux-gnu-gcc --cxx=x86_64-pc-linux-gnu-g++
 --ar=x86_64-pc-linux-gnu-ar --optflags='-march=haswell -mavx2 -msse4.2
 -msse4.1 -O2 -pipe -mmmx -msse -msse2 -mssse3 --param l1-cache-size=32
 --param l1-cache-line-size=64 --param l2-cache-size=8192 -mtune=haswell'
 --disable-static --enable-avfilter --enable-avresample --disable-stripping
 --enable-version3 --disable-indev=oss --disable-outdev=oss --enable-
 nonfree --enable-bzlib --disable-runtime-cpudetect --disable-debug
 --disable-gcrypt --enable-gnutls --disable-gmp --enable-gpl --enable-
 hardcoded-tables --enable-iconv --enable-lzma --enable-network --disable-
 openssl --enable-postproc --enable-libsmbclient --enable-ffplay --enable-
 sdl2 --enable-vaapi --disable-vdpau --enable-xlib --enable-libxcb
 --enable-libxcb-shm --enable-libxcb-xfixes --enable-zlib --disable-libcdio
 --disable-libiec61883 --disable-libdc1394 --disable-libcaca --disable-
 openal --enable-opengl --disable-libv4l2 --enable-libpulse --disable-
 libopencore-amrwb --disable-libopencore-amrnb --enable-libfdk-aac
 --enable-libopenjpeg --enable-libbluray --disable-libcelt --disable-libgme
 --disable-libgsm --disable-mmal --disable-libmodplug --enable-libopus
 --disable-libilbc --disable-librtmp --disable-libssh --disable-
 libschroedinger --enable-libspeex --enable-libvorbis --enable-libvpx
 --disable-libzvbi --disable-libbs2b --disable-chromaprint --disable-
 libflite --enable-frei0r --disable-libfribidi --disable-fontconfig
 --enable-ladspa --disable-libass --enable-libfreetype --disable-
 librubberband --disable-netcdf --disable-libzmq --disable-libzimg
 --enable-libvidstab --disable-libsoxr --enable-pthreads --disable-libvo-
 amrwbenc --enable-libmp3lame --disable-libkvazaar --disable-nvenc
 --disable-libopenh264 --disable-libsnappy --enable-libtheora --disable-
 libtwolame --disable-libwavpack --enable-libwebp --enable-libx264
 --enable-libx265 --enable-libxvid --disable-amd3dnow --disable-amd3dnowext
 --disable-fma4 --disable-xop --cpu=haswell --disable-doc --disable-
 htmlpages --enable-manpages
 libavutil      55. 58.100 / 55. 58.100
 libavcodec     57. 89.100 / 57. 89.100
 libavformat    57. 71.100 / 57. 71.100
 libavdevice    57.  6.100 / 57.  6.100
 libavfilter     6. 82.100 /  6. 82.100
 libavresample   3.  5.  0 /  3.  5.  0
 libswscale      4.  6.100 /  4.  6.100
 libswresample   2.  7.100 /  2.  7.100
 libpostproc    54.  5.100 / 54.  5.100

 $ cat file.keyinfo
 file.key
 fftest/file.key

 file.key is 16-byte file genereted by
 openssl rand 16 > fftest/file.key

 ----
 $ cat cle.m3u8
 #EXTM3U
 #EXT-X-VERSION:4
 #EXT-X-TARGETDURATION:12
 #EXT-X-MEDIA-SEQUENCE:0
 #EXT-X-PLAYLIST-TYPE:VOD
 #EXT-X-KEY:METHOD=AES-128,URI="file.key"
 #EXTINF:12.000000,
 #EXT-X-BYTERANGE:8383484 at 0
 cle.ts
 #EXTINF:2.208333,
 #EXT-X-BYTERANGE:597088 at 8383484
 cle.ts
 #EXTINF:10.416667,
 #EXT-X-BYTERANGE:1874548 at 8980572
 cle.ts
 #EXTINF:3.166667,
 #EXT-X-BYTERANGE:497448 at 10855120
 cle.ts
 #EXTINF:8.458333,
 #EXT-X-BYTERANGE:4049332 at 11352568
 cle.ts
 #EXTINF:10.416667,
 #EXT-X-BYTERANGE:1993364 at 15401900
 cle.ts
 #EXTINF:3.333333,
 #EXT-X-BYTERANGE:641456 at 17395264
 cle.ts
 #EXT-X-ENDLIST

 }}}

 As workaround I used this:

 {{{
 ffmpeg -i input.mp4 -c:v libx264 -crf 28 -profile high -level 41
 -keyint_min 25 -c:a libfdk_aac -vbr 1 -hls_time 6 -hls_list_size 0
 -hls_playlist_type vod -hls_key_info_file file.keyinfo -f hls
 fftest/cle_s.m3u8

 cat cle_s*.ts > clex.ts
 and computed ranges manually. And it works now.

 ----
 #EXTM3U
 #EXT-X-VERSION:4
 #EXT-X-TARGETDURATION:12
 #EXT-X-MEDIA-SEQUENCE:0
 #EXT-X-PLAYLIST-TYPE:VOD
 #EXT-X-KEY:METHOD=AES-128,URI="file.key"
 #EXTINF:12.000000,
 #EXT-X-BYTERANGE:8383488 at 0
 clex.ts
 #EXTINF:2.208333,
 #EXT-X-BYTERANGE:597280 at 8383488
 clex.ts
 #EXTINF:10.416667,
 #EXT-X-BYTERANGE:1874752 at 8980768
 clex.ts
 #EXTINF:3.166667,
 #EXT-X-BYTERANGE:497648 at 10855520
 clex.ts
 #EXTINF:8.458333,
 #EXT-X-BYTERANGE:4049536 at 11353168
 clex.ts
 #EXTINF:10.416667,
 #EXT-X-BYTERANGE:1993568 at 15402704
 clex.ts
 #EXTINF:3.333333,
 #EXT-X-BYTERANGE:641648 at 17396272
 clex.ts
 #EXT-X-ENDLIST

 }}}

 It seems The ranges are counted right before encrypting since non-
 encrypted HLS encoding have same ranges.
 Fix seems to be made easy - count size of encrypted chunk instead of non-
 encrypted. But i really didn't search source, so I only guessing. Thanks.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/6457>
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