# Unable to get audio playback when specifying single file audio tracks in SMIL file **URL:** \ **Category:** Wowza Streaming Engine\ **Tags:** media-players-and-devices\ **Created:** [March 24, 2015, 6:14pm UTC](https://community.wowza.com/t/unable-to-get-audio-playback-when-specifying-single-file-audio-tracks-in-smil-file/37284 "2015-03-24T18:14:02Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Timmy\_Atch](https://avatars.discourse-cdn.com/v4/letter/t/9fc29f/32.png) [@Timmy\_Atch](https://community.wowza.com/u/Timmy_Atch)\ **Post date:** [March 24, 2015, 6:14pm UTC](https://community.wowza.com/t/unable-to-get-audio-playback-when-specifying-single-file-audio-tracks-in-smil-file/37284/1 "2015-03-24T18:14:02Z")
Hi, I have been attempting to get alternative audio tracks working with HLS. [https://www.wowza.com/docs/how-to-use-alternative-audio-or-video-tracks-with-apple-hls-streams#singlefile](https://www.wowza.com/docs/how-to-use-alternative-audio-or-video-tracks-with-apple-hls-streams#singlefile) The source video file I am using has 3 audio tracks on it, that I have confirmed works correctly if I use http:/…/xyz/mp4:video.mp4/playlist.m3u8?audioindex=# So i have reason to believe there shouldn’t be an issue with the video file it self. Here is an ffprobe output: > ffprobe version N-64216-ga30f1b1 Copyright (c) 2007-2014 the FFmpeg developers > > built on Jun 24 2014 22:31:41 with gcc 4.8.3 (GCC) > > configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-decklink --enable-zlib > > libavutil 52. 90.101 / 52. 90.101 > > libavcodec 55. 68.100 / 55. 68.100 > > libavformat 55. 44.100 / 55. 44.100 > > libavdevice 55. 13.101 / 55. 13.101 > > libavfilter 4. 9.100 / 4. 9.100 > > libswscale 2. 6.100 / 2. 6.100 > > libswresample 0. 19.100 / 0. 19.100 > > libpostproc 52. 3.100 / 52. 3.100 > > Input #0, mov,mp4,m4a,3gp,3g2,mj2, from ‘C:\gt\server-based\media\private\t1m\549190108530450\466003738621220\466003738621220.pc.mp4’: > > Metadata: > > major\_brand : isom > > minor\_version : 512 > > compatible\_brands: isomiso2avc1mp41 > > encoder : Lavf55.44.100 > > Duration: 00:01:41.78, start: 0.000000, bitrate: 1888 kb/s > > Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1272x720 [SAR 160:159 DAR 16:9], 1499 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default) > > Metadata: > > handler\_name : VideoHandler > > Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 124 kb/s (default) > > Metadata: > > handler\_name : SoundHandler > > Stream #0:2(fra): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 125 kb/s > > Metadata: > > handler\_name : SoundHandler > > Stream #0:3(deu): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 125 kb/s > > Metadata: > > handler\_name : SoundHandler > > Using the single file sample SMIL file, I receive no audio from every player I’ve used so far. In VLC, there is one audio track (selected by default). > > Here is the playlist.m3u8 outputed from Wowza: > > ```auto > #EXTM3U > #EXT-X-VERSION:3 > #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="aac",LANGUAGE="en",NAME="English",DEFAULT=YES,AUTOSELECT=YES,URI="chunklist_w1134224132_b44100_ao_slen_t64RW5nbGlzaA==.m3u8?audioindex=1" > #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="aac",LANGUAGE="de",NAME="Deutsch",DEFAULT=FALSE,AUTOSELECT=YES,URI="chunklist_w1134224132_b44100_ao_slde_t64RGV1dHNjaA==.m3u8?audioindex=1" > #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="aac",LANGUAGE="fr",NAME="Francais",DEFAULT=FALSE,AUTOSELECT=YES,URI="chunklist_w1134224132_b44100_ao_slfr_t64RnJhbmNhaXM=.m3u8?audioindex=1" > #EXT-X-STREAM-INF:BANDWIDTH=1100000,CODECS="avc1.66.10",RESOLUTION=640x360,AUDIO="aac" > chunklist_w1134224132_b1100000_vo.m3u8?audioindex=1 > > ``` > > So to sum it all up, adjusting my .smil file to mimic [https://www.wowza.com/docs/how-to-use-alternative-audio-or-video-tracks-with-apple-hls-streams#singlefile](https://www.wowza.com/docs/how-to-use-alternative-audio-or-video-tracks-with-apple-hls-streams#singlefile) causes 0 audio output for me. Instead of showing 3 tracks in the video player, it shows just 1 and that 1 has no audio output. > > Can anyone help? Has anyone else had success with adaptive streaming using HLS that also include multiple audio tracks? > > Any help would be great! > > Thank you, > > Tim ---
**Author:** ![Paul\_Shields](https://sea2.discourse-cdn.com/flex002/user_avatar/community.wowza.com/paul_shields/32/390_2.png) [@Paul\_Shields](https://community.wowza.com/u/Paul_Shields)\ **Post date:** [March 25, 2015, 1:16pm UTC](https://community.wowza.com/t/unable-to-get-audio-playback-when-specifying-single-file-audio-tracks-in-smil-file/37284/2 "2015-03-25T13:16:39Z")
Hi, Have you confirmed that you have enabled [ModuleMultiTrackVod](https://www.wowza.com/docs/how-to-select-multiple-tracks-from-a-vod-file-modulemultitrackvod%28ModuleMultiTrackVOD%29) from the Module Collection? If so and you’re happy that everything is configured correctly you could raise a [support request](https://www.wowza.com/forums/content.php). Include your sample file as well as the files listed in the support link and we take a further look.