[FFmpeg-user] Nvenc transcode on GTX690 with >1 channel per GPU

Subscriptions@znet.ca subscriptions at znet.ca
Sat Feb 13 04:02:14 CET 2016

Hello everyone,

Please disregard previous mail; I managed to start two channels on the 
same GPU, however it is unreliable - first channel will start every 
time, while second may fail or work. Investing. Just for information, 
card is:

4:00.0 3D controller: NVIDIA Corporation GK104 [GeForce GTX 690] (rev 
04:00.1 Audio device: NVIDIA Corporation GK104 HDMI Audio Controller 
(rev a1)
05:00.0 VGA compatible controller: NVIDIA Corporation GK104GL [Tesla 
K10] (rev a1)
05:00.1 Audio device: NVIDIA Corporation GK104 HDMI Audio Controller 
(rev a1)

Sorry for the noise,

On 2016-02-12 19:17, Subscriptions at znet.ca wrote:
> Hello,
> I am using an GTX690 unlocked card (equivalent to double K10) to
> transcode live mpeg2 to h264 as here:
> /usr/local/bin/ffmpeg -i udp://
> -y -c:a copy -c:v nvenc -b:v 4M -profile:v high -preset default
> -bufsize 8M -s hd720 -segment_list_flags live -segment_time 4
> -segment_format mpeg_ts -gpu 1 -metadata title=RDI m3u/RDI/stream.m3u8
> All is is fine (thanks to Moritz Barsnick from this list for help)
> till I transcode only one channel per gpu. If I however send a second
> channel to the same gpu (-gpu 1 above), the ffmpeg will refuse to
> start.
> So, my question is if there is a way to have >1 instance of ffmpeg
> using the same GPU at the same time? The GPU's have enough power for
> several channels in parallel.
> In /dev I have: /dev/nvidia0  /dev/nvidia1  /dev/nvidiactl  
> /dev/nvidia-uvm
> Any suggestion appreciated,
> Thanks, George.
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