Multiple audio tracks in webm without transcoding

[Guest]

Hi,

I want to play a movie in the Google Chrome browser with the possibility to choose the audio language, but without using the transcoding function. Ideally I would like to reproduce it without using the "convert without encoding" option, but I can use it if there is no other choice.

When I use mp4 / h264 / aac, it works when I enable "convert without encoding" and disable "enable transcoding", but not when I use webm / vp9 / opus or vorbis.

I coded the movie myself with the following command:

ffmpeg -y -i input.mkv -map 0 -c:v libvpx-vp9 -pass 1 -b:v 2M \
-threads 1 -cpu-used 0 -deadline best -tile-columns 0 -frame-parallel 0 \
-g 9999 -aq-mode 0 -an -f webm /dev/null
ffmpeg -y -i input.mkv -map 0 -c:v libvpx-vp9 -pass 2 -b:v 2M \
-threads 1 -cpu-used 0 -deadline best -tile-columns 0 -frame-parallel 0 \
-g 9999 -aq-mode 0 -auto-alt-ref 1 -lag-in-frames 25 -c:a libopus -b:a 128k -ac 2 -f webm "Taxi driver.webm"

When I play the movie with the default audio track it works fine, but when I change the language I get the message "No compatible streams are currently available. Please try again later or contact your system administrator for details.". 

I use Debian Linux, but I also tried on Windows and I get the same error, so I have posted this in the "General" forum.

For each failed replay attempt, emby generates three log files.

Thanks in advance.

ffmpeg-directstream-753a8b0e-6605-4a66-9181-a9eba99d3521_1.txt ffmpeg-directstream-8bcca4fc-b795-44dd-913f-175063a085d9_1.txt ffmpeg-directstream-95e6ae66-c5a0-4cbd-b545-99d164be0cde_1.txt embyserver.txt

[Abobader 3471]

Hello Herberst,

Please wait for someone from staff support or our members to reply to you.

It's recommended to provide more info, as it explain in this thread:

Thank you.

Emby Team

[Luke 42086]

Hi, the browser video player does not provide an API for us to change the selected track, so if you select a secondary audio track, then a conversion on the server will be necessary. Please let us know if this helps. Thanks.

[Guest]

But is a conversion without video transcoding possible? My server has a very limited CPU and has many simultaneous clients.

Thanks

[rbjtech 5285]

Why not change the default audio track to be the mobile friendly one (opus), and put the secondary audio as the original ?  Emby only reads the 1st Video track anyway - so no point trying to multi-track on that.

Just use the ffmpeg map command to insert the track and disposition to change the default - for EXAMPLE

 -map 0:v -map 0:a:0 -map 0:a -c:v copy -c:a copy -c:a:0 <Audio Codec> < remap the tracks to insert a new audio track 0 with the codec of your liking  

-disposition:a:0 default -disposition:a:1 0  < change the audio default track to track 0 

-metadata:s:a:0 title="New Audio Track" -metadata:s:a:1 title="Original Audio Track" < you can write new track data while you are at it ..

I hope this helps.

 

[Luke 42086]

18 hours ago, Herberst said:

But is a conversion without video transcoding possible? My server has a very limited CPU and has many simultaneous clients.

Thanks

If the video codec is h264, yes.