On Wed, 23 Sep 2015, Ricardo Kleemann wrote:
On Wed, Sep 23, 2015 at 12:47 PM, Flávio Pontes <[email protected]>
wrote:
Hi,
I need to stream the 2 inputs from a DeckLink Duo card in FHD.
So far I could compile ffmpeg with decklink support and capture one input
at a time without problems.
When I try to capture from the 2 inputs I start getting the following
message repeatedly on both terminals:
[decklink @ 0x32287e0] Decklink input buffer overrun!
I use these commands in the terminals:
/opt/ffmpeg_build/bin/ffmpeg -f decklink -re -i 'DeckLink SDI (1)@7' -g 90
-s hd1080 -profile:v baseline -pix_fmt yuv420p -preset veryfast -c:v
libx264 -b:v 2000k -bufsize 1400k -minrate 2000k -maxrate 2000k -c:a
libfdk_aac -b:a 96k -threads 4 -f flv rtmp://10.12.20.62/myapp/tvines
/opt/ffmpeg_build/bin/ffmpeg -f decklink -re -i 'DeckLink SDI (2)@7' -g 90
-s hd1080 -profile:v baseline -pix_fmt yuv420p -preset veryfast -c:v
libx264 -b:v 2000k -bufsize 1400k -minrate 2000k -maxrate 2000k -c:a
libfdk_aac -b:a 96k -threads 4 -f flv rtmp://10.12.20.62/myapp/tvescola
I tried many combinations but couldn't get it to work.
I wonder if the input buffer is shared between the 2 inputs.
Is there any way to set an input buffer size independently for each
command?
Thx in advance!
Flávio.
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Hi Flávio,
I'm not sure if this directly addresses your problem, but have you tried
using the -thread_queue_size parameter? I believe having a deeper queue
might help, the default value is only 8. I've used much larger values, even
2048 for example.
Thread queue size only has an effect if multiple input sources are used.
If a single input is used then reading from it is not threaded in the
current ffmpeg.c implementation.
Regards,
Marton
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