mpegtsmux, high overhead for a small aac bitrate

[Vincent Génieux]

Le 18/05/2016 11:13, Vincent Génieux a écrit :
>
> I am facing an issue with the following pipeline :
>
> audiotestsrc num-buffers=100000 ! audio/x-raw,channels=2 ! voaacenc 
> bitrate=32000 ! mpegtsmux ! filesink location=test.ts
>
> The tsdemux generate a stream with a huge bitrate compared to other 
> containers, such as mp4mux :
>

I am talking about the tsmuxer, not the demux, sorry for the mistake

> audiotestsrc num-buffers=100000 ! audio/x-raw,channels=2 !  voaacenc 
> bitrate=32000 ! mp4mux ! filesink location=test.mp4
>
> $ ls -lh test.*
> -rw-r--r-- 1 vincent vincent 9.6M May 18 10:56 test.mp4
> -rw-r--r-- 1 vincent vincent  26M May 18 10:57 test.ts
>
> I think there is a misconfiguration somewhere which leads the demux to 
> create very small chunk with many headers. I also noticed we can 
> reduce the size of the ts file with libav :
>
> $ avconv -i test.ts -codec copy test2.ts
> $ ls -lh *.ts
> -rw-r--r-- 1 vincent vincent  26M May 18 10:57 test.ts
> -rw-r--r-- 1 vincent vincent 9.8M May 18 11:03 test2.ts
>
>
> Do you have any idea on how I could reduce the bitrate of the ts 
> stream in my pipeline ?
>

--
vincent.