[gst-devel] FAAC bitrate

[Stefan Kost]

Mike Dyer wrote:
> Hi all,
>
> I'm trying to capture and encode some live audio/video to an mpeg-ts.
> The audio is compressed using faac. However I've noticed that whatever
> bitrate I request from faac, its always 128kbps.
>
> I can replicate using an audio-only pipeline:
>
> gst-launch alsasrc device=hw:0 !
> audio/x-raw-int,channels=2,rate=44100,width=16 ! audioconvert ! faac
> outputformat=1 profile=2 bitrate=8000 ! ffmux_mpegts ! filesink
> location=faac.ts
>   

hat looks correct, also the plugin code itself does not show anything
obviously wrong. How did you verify the bitrate?

Stefan

> gst-launch -v gives:
>
> Setting pipeline to PAUSED ...
> /GstPipeline:pipeline0/GstAlsaSrc:alsasrc0: actual-buffer-time = 200000
> /GstPipeline:pipeline0/GstAlsaSrc:alsasrc0: actual-latency-time = 10000
> /GstPipeline:pipeline0/GstAlsaSrc:alsasrc0.GstPad:src: caps =
> audio/x-raw-int, endianness=(int)1234, signed=(boolean)true,
> width=(int)16, depth=(int)16, rate=(int)44100, channels=(int)2
> Pipeline is live and does not need PREROLL ...
> Setting pipeline to PLAYING ...
> New clock: GstAudioSrcClock
> /GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:src: caps =
> audio/x-raw-int, endianness=(int)1234, signed=(boolean)true,
> width=(int)16, depth=(int)16, rate=(int)44100, channels=(int)2
> /GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:sink: caps =
> audio/x-raw-int, endianness=(int)1234, signed=(boolean)true,
> width=(int)16, depth=(int)16, rate=(int)44100, channels=(int)2
> /GstPipeline:pipeline0/GstAudioConvert:audioconvert0.GstPad:src: caps =
> audio/x-raw-int, endianness=(int)1234, signed=(boolean)true,
> width=(int)16, depth=(int)16, rate=(int)44100, channels=(int)2
> /GstPipeline:pipeline0/GstAudioConvert:audioconvert0.GstPad:sink: caps =
> audio/x-raw-int, endianness=(int)1234, signed=(boolean)true,
> width=(int)16, depth=(int)16, rate=(int)44100, channels=(int)2
> /GstPipeline:pipeline0/GstFaac:faac0.GstPad:src: caps = audio/mpeg,
> mpegversion=(int)4, channels=(int)2, rate=(int)44100,
> codec_data=(buffer)1210
> /GstPipeline:pipeline0/GstFaac:faac0.GstPad:sink: caps =
> audio/x-raw-int, endianness=(int)1234, signed=(boolean)true,
> width=(int)16, depth=(int)16, rate=(int)44100, channels=(int)2
> /GstPipeline:pipeline0/ffmux_mpegts:ffmux_mpegts0.GstPad:audio_0: caps =
> audio/mpeg, mpegversion=(int)4, channels=(int)2, rate=(int)44100,
> codec_data=(buffer)1210
> /GstPipeline:pipeline0/GstFileSink:filesink0.GstPad:sink: caps =
> video/mpegts, systemstream=(boolean)true
>
> How do I make faac listen to the bitrate setting?  
>
>