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

[Ricardo]

very interesting ;) i have a gtx960. I'm thinking in do some test. 
Only one thing, what is a k10?
thanks!



> El 15 feb 2016, a las 2:04, Subscriptions at znet.ca <subscriptions at znet.ca> escribió:
> 
> Hello again everyone,
> 
> This is just to note, if someone is interested, that after converting the second GPU of my GTX690 to K10, the card started transcoding >2 channels at once - managed to put up to 6 channels at once, full HD mpeg2 at ~18Mb/s per channel. Now there is another problem - the card freezes the computer if I put > 6 channels - I put a watchdog to reboot it, but this is not a solution. Theoretically the card has to do about 16 HD channels (240 fps per GPU, 2 GPU's), but it freezes far before. Investigating.
> 
> Thanks, George.
> 
>> On 2016-02-12 22:24, Subscriptions at znet.ca wrote:
>> 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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