# Testing Alternative audio or video feature with Apple HLS: working also for rtmp ? **URL:** \ **Category:** Wowza Streaming Engine\ **Created:** [December 6, 2015, 2:10am UTC](https://community.wowza.com/t/testing-alternative-audio-or-video-feature-with-apple-hls-working-also-for-rtmp/33854 "2015-12-06T02:10:29Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![kv\_pham](https://avatars.discourse-cdn.com/v4/letter/k/7bcc69/32.png) [@kv\_pham](https://community.wowza.com/u/kv_pham)\ **Post date:** [December 6, 2015, 2:10am UTC](https://community.wowza.com/t/testing-alternative-audio-or-video-feature-with-apple-hls-working-also-for-rtmp/33854/1 "2015-12-06T02:10:29Z")
Hello i’m testing what is described here: [https://www.wowza.com/docs/how-to-use-alternative-audio-or-video-tracks-with-apple-hls-streams&postid=156753](https://www.wowza.com/docs/how-to-use-alternative-audio-or-video-tracks-with-apple-hls-streams&postid=156753) My goal is to be able to stream **live** content with different audio channels corresponding to different languages. I have a mpeg-ts source with 5 audio channels simulated by ffmpeg streaming to a udp port: ffmpeg -re -i source.ts -map 0:0 -vcodec copy -map 0:1 -acodec copy -map 0:2 -acodec copy -map 0:3 -acodec copy -map 0:4 -acodec copy -map 0:5 -acodec copy -f mpegts udp://[server IP]:10000?pkt\_size=1316 I followed the guide above and I’m quite surprised because when I tested the various .stream files created for each language (lang1.stream, lang2.stream , etc), I find that they work with rtmp: I get 5 streams with same video but different languages that I can play on any flash or html5 player. :o This is quite unexpected and wonderful. Has there been some upgrade on the server explaining that ? I did not see anything reported on the Release Notes of the latest updates. I’m on 4.2.0 (build 15089). Thanks. ---
**Author:** ![Daren\_Johnson](https://avatars.discourse-cdn.com/v4/letter/d/ee59a6/32.png) [@Daren\_Johnson](https://community.wowza.com/u/Daren_Johnson)\ **Post date:** [December 7, 2015, 11:54pm UTC](https://community.wowza.com/t/testing-alternative-audio-or-video-feature-with-apple-hls-working-also-for-rtmp/33854/2 "2015-12-07T23:54:23Z")
Hi, This has been possible for quite a while. Reference this [old guide](https://www.wowza.com/docs/how-to-select-mpeg-ts-stream-by-program-id-and-also-audio-language-by-pid) or this more [recent guide](https://www.wowza.com/docs/how-to-specify-per-stream-settings-in-stream-files) regarding the selection of video and audio PIDs. The difference with HLS is that the video/audio can be selected across a smil file. Daren ---
**Author:** ![kv\_pham](https://avatars.discourse-cdn.com/v4/letter/k/7bcc69/32.png) [@kv\_pham](https://community.wowza.com/u/kv_pham)\ **Post date:** [December 8, 2015, 5:49pm UTC](https://community.wowza.com/t/testing-alternative-audio-or-video-feature-with-apple-hls-working-also-for-rtmp/33854/3 "2015-12-08T17:49:12Z")
> Hi, > > This has been possible for quite a while. Reference this [old guide](https://www.wowza.com/docs/how-to-select-mpeg-ts-stream-by-program-id-and-also-audio-language-by-pid) or this more [recent guide](https://www.wowza.com/docs/how-to-specify-per-stream-settings-in-stream-files) regarding the selection of video and audio PIDs. > > The difference with HLS is that the video/audio can be selected across a smil file. > > Daren :hello: 🙂 thanks Darren. ok, I had presumed that the selection of programs, audio etc, in mpeg-ts was possible only for VOD (as it is for mp4). My mistake. Another related question, it doesn’t seem possible at the moment to publish mpeg-ts over tcp with wowza? I’d rather send over tcp than udp for better reliability. At the moment I’m considering work-arounds with ffmpeg in tcp relaying to wowza in udp, or sending udp over a vpn tunnel. Thanks edit: confirmation that wowza can not ingest at the time mpeg-ts over tcp. But workarounds are simple with ffmpeg