Capturing and encoding live video and audio: AMD FX(tm)-8350 Eight-Core Processor not fast enough?

[Nicolas Dufresne]

Le jeudi 21 décembre 2017 à 15:35 -0200, Rodrigo Severo a écrit :
> gst-launch-1.0 v4l2src device=/dev/video0 norm=45056 ! queue !
> videoconvert ! videoscale ! videorate ! 'video/x-raw, width=640,
> height=400, framerate=15/1, format=I420' ! x264enc ! h264parse !
> stream. pulsesrc device="alsa_input.usb-
> Hauppauge_Hauppauge_Device_0013745411-01.analog-stereo" ! queue !
> audioconvert ! audioresample ! 'audio/x-raw, channels=2, rate=48000'
> ! lamemp3enc ! mpegaudioparse ! stream. mpegtsmux name=stream ! queue
> ! filesink location=/home/rodrigo/temp/test.mpeg
> 
> To my surprise I get several messages like:
> 
> Setting pipeline to PAUSED ...
> Pipeline is live and does not need PREROLL ...
> Setting pipeline to PLAYING ...
> New clock: GstPulseSrcClock
> Redistribute latency...
> Redistribute latency...
> Redistribute latency...
> WARNING: from element /GstPipeline:pipeline0/GstPulseSrc:pulsesrc0:
> Can't record audio fast enough
> Additional debug info:
> gstaudiobasesrc.c(847): gst_audio_base_src_create ():
> /GstPipeline:pipeline0/GstPulseSrc:pulsesrc0:
> Dropped 125760 samples. This is most likely because downstream can't
> keep up and is consuming samples too slowly.
> 
> All messages from the warning to the "too slowly" are repeated all
> the time.
> 
> My first surprise: I believe an eight core processor should be much
> more than enough to do such a job without problems but apparently it
> isn't.
> 
> My second surprise,: it's the _audio_ that's being too slowly
> processed, not the video.
> 
> In reality I believe I'm doing something wrong. Can someone help me
> find what it is?
> 
> BTW, I'm using GStreamer 1.12.3 on Ubuntu 17.10.

It's propably a buffering issue. Disable bytes size limited on your
queus, maybe that will fix it. Note that x264enc in default
configuration is designed of offline encoding. Just retry and
tune=zerolatency you'll see a large difference.

Nicolas
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