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

[Subscriptions@znet.ca]

Hello again,

My problem is probably coming from the fact that the GTX690 card is 
half-converted to a K10 one; one GPU is presented as K10 while the other 
forms half GTX690. The driver is likely quite puzzled what this hardware 
is and how to drive it. So, next step is to make the GPU 0 to identify 
itself as K10, then I shall be able to continue.

Thanks, george.

On 2016-02-12 22:02, Subscriptions at znet.ca wrote:
> 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 
> a1)
> 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,
> George.
> 
> 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://239.255.254.2:1234?overrun_nonfatal=1
>> -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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