I have a new system and have been having issues with VMix hardware encoding for streaming from the beginning. The system functions in OBS perfectly and other software. Specifications: MSI 5080 Suprim CamLink Pro (connected to CPU PCIE LANE) Intel 285k CPU 64GB RAM Latest VMix software Latest Nvidia Drivers Symptoms: - Using VMix FFMPEG/ FFMPEG2/FFMPEG6 to stream to any destination with Hardware Encoding ON causes the Stream to fail to start, error given in log: "No NVENC capable devices found". Streaming with Hardware Encoding OFF streams successfully, or when using CPU for hardware encoding. What I have tried: - Checked that VMix sees GPU in Settings - Performance tab - Ensured no other processes are using NVENC - Tried low latency and high performance modes - I tried disabling all hardware encoding in VMix and enabling again - Reinstalling VMix - Reinstalling GPU drivers - Streaming from OBS with hardware encoding (verified it works in OBS) - Recording in VMix MP4 with hardware encoding (verified it works, only streaming doesn't) I tried emailing VMix support and am still working with them, but no resolution after troubleshooting. Does anyone else have a 5080 and having issues with Hardware Encoding to Stream in VMix? LOG: Quote:FFMPEG1.Exited
Streaming
[h264_nvenc @ 056d2ba0] No NVENC capable devices found
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
libavfilter 6.105.100 / 6.105.100
libswscale 4. 7.103 / 4. 7.103
libswresample 2. 8.100 / 2. 8.100
libpostproc 54. 6.100 / 54. 6.100
Guessed Channel Layout for Input Stream #0.1 : stereo
Input #0, dshow, from 'video=vMix Video YV12:audio=vMix Audio':
Duration: N/A, start: 5925.428000, bitrate: 1536 kb/s
Stream #0:0: Video: rawvideo (YV12 / 0x32315659), yuv420p, 1280x720, 29.97 fps, 29.97 tbr, 10000k tbn, 10000k tbc
Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
[tcp @ 056d7b40] TCP Buffer has been set to 6571008 bytes
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (h264_nvenc))
Stream #0:1 -> #0:1 (pcm_s16le (native) -> aac (native))
Press [q] to stop, [?] for help
[h264_nvenc @ 056d2ba0] Failed creating CUDA context for NVENC: 0x3e7
[h264_nvenc @ 056d2ba0] No NVENC capable devices found
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
[aac @ 056d6540] Qavg: nan
[aac @ 056d6540] 1 frames left in the queue on closing
Conversion failed!
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Originally Posted by: w0nger  Update:
I was correct, the issues were caused by the ridiculously outdated ffmpeg libraries being used by vmix. But then again I have a feeling the vmix team is already aware of the issue and have simply chosen to keep quiet. I'm pretty annoyed to say the least and will re-consider my choice to continue using vmix in the future.
For anyone googling this problem, I solved it by download gyan's build of ffmpeg for windows, and deleting "ffmpeg2.exe" in the vmix/streaming folder, then I moved the new ffmpeg from gyan and renamed it ffmpeg2.
I can now record 8 4k prores 422 streams without my xeon breaking a sweat. Hi @w0nger. Now a year later - is this still an issue? I am also looking to record 4x4K video feeds in prores, and also have great hardware for the task. I am wondering if vMix updated their FFMPEG encoder or if i am going to run into the same issue a you :) - Do you know? Thanks !
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here is my log sheet
ffmpeg started on 2024-12-21 at 11:04:16
Report written to "C:\ProgramData\vMix\streaming\streaming1 20241221-110416.log"
Command line:
"C:\\Program Files (x86)\\vMix\\streaming\\ffmpeg2.exe" -report -rtbufsize 128M -f dshow -i "video=vMix Video YV12:audio=vMix Audio" -codec:v libx264 -s:v 1280x720 -pix_fmt:v yuv420p -threads 4 -bufsize:v 500k -g:v 60 -preset:v fast -profile:v baseline -level:v 3.1 -x264opts:v "keyint=60:min-keyint=60:scenecut=-1" -b:v 1000k -maxrate:v 1000k -minrate:v 1000k -codec:a aac -b:a 96k -strict -2 -rtmp_flashver "FMLE/3.0 (compatible; vMix/27.0.0.89)" -f flv "rtmp://la.castr.io/static/live_******?password=********" -codec:v h264_nvenc -s:v 1280x720 -pix_fmt:v yuv420p -threads 4 -bufsize:v 1250k -g:v 60 -preset:v llhq -profile:v baseline -b:v 2500k -maxrate:v 2500k -minrate:v 2500k -codec:a aac -b:a 128k -strict -2 -rtmp_flashver "FMLE/3.0 (compatible; vMix/27.0.0.89)" -f flv "rtmp://la.castr.io/static/live_******?password=********"
ffmpeg version 3.3.git Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 4.8.1 (rev2, Built by MinGW-W64 project)
configuration: --enable-gpl --enable-version3 --enable-libx264 --enable-zlib --enable-nvenc --cpu=i686
libavutil 55. 76.100 / 55. 76.100
libavcodec 57.106.101 / 57.106.101
libavformat 57. 82.101 / 57. 82.101
libavdevice 57. 8.101 / 57. 8.101
libavfilter 6.105.100 / 6.105.100
libswscale 4. 7.103 / 4. 7.103
libswresample 2. 8.100 / 2. 8.100
libpostproc 54. 6.100 / 54. 6.100
Guessed Channel Layout for Input Stream #0.1 : stereo
Input #0, dshow, from 'video=vMix Video YV12:audio=vMix Audio':
Duration: N/A, start: 88127.032000, bitrate: 1536 kb/s
Stream #0:0: Video: rawvideo (YV12 / 0x32315659), yuv420p, 1280x720, 29.97 fps, 29.97 tbr, 10000k tbn, 10000k tbc
Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
[tcp @ 0294dfa0] TCP Buffer has been set to 9310208 bytes
rtmp://la.castr.io/static/live_******: I/O error
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So vMix is giving me an I/O error whenever I try to stream out. This is to YouTube, but I tried others - I originally started trying to stream with Restream and got the error.
I know this is an internal issue, so I disabled the firewall and the problem didn't go away.
Streaming through other programs (OBS, Wirecast) is not an issue, so it's definitely located in some vMix setting.
I am short of re-installing vMix, but I thought I'd come here to see if there is anyone that has an idea of what's going on.
ffmpeg started on 2024-11-20 at 09:54:45
Report written to "C:\ProgramData\vMix\streaming\streaming1 20241120-095445.log"
Command line:
"C:\\Program Files (x86)\\vMix\\streaming\\ffmpeg2.exe" -report -rtbufsize 128M -f dshow -i "video=vMix Video YV12:audio=vMix Audio" -codec:v libx264 -s:v 1920x1080 -pix_fmt:v yuv420p -threads 4 -bufsize:v 4500k -g:v 120 -preset:v veryfast -profile:v baseline -level:v 3.1 -b:v 4500k -maxrate:v 4950k -codec:a aac -b:a 128k -strict -2 -rtmp_flashver "FMLE/3.0 (compatible; vMix/27.0.0.88)" -f flv rtmp://a.rtmp.youtube.com/live2/secret-key -codec:v h264_nvenc -s:v 1280x720 -pix_fmt:v yuv420p -threads 4 -bufsize:v 2800k -g:v 120 -preset:v llhq -profile:v baseline -b:v 2800k -maxrate:v 3080k -codec:a aac -b:a 128k -strict -2 -rtmp_flashver "FMLE/3.0 (compatible; vMix/27.0.0.88)" -f flv rtmp://a.rtmp.youtube.com/live2/secret-key
ffmpeg version 3.3.git Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 4.8.1 (rev2, Built by MinGW-W64 project)
configuration: --enable-gpl --enable-version3 --enable-libx264 --enable-zlib --enable-nvenc --cpu=i686
libavutil 55. 76.100 / 55. 76.100
libavcodec 57.106.101 / 57.106.101
libavformat 57. 82.101 / 57. 82.101
libavdevice 57. 8.101 / 57. 8.101
libavfilter 6.105.100 / 6.105.100
libswscale 4. 7.103 / 4. 7.103
libswresample 2. 8.100 / 2. 8.100
libpostproc 54. 6.100 / 54. 6.100
Guessed Channel Layout for Input Stream #0.1 : stereo
Input #0, dshow, from 'video=vMix Video YV12:audio=vMix Audio':
Duration: N/A, start: 5243.235000, bitrate: 1536 kb/s
Stream #0:0: Video: rawvideo (YV12 / 0x32315659), yuv420p, 1920x1080, 60 fps, 60 tbr, 10000k tbn, 10000k tbc
Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
[tcp @ 05f88640] TCP Buffer has been set to 18890752 bytes
rtmp://a.rtmp.youtube.com/live2/secret-key: I/O error
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I am in trouble. When encoding from Vmix to RTMP, the master frame rate is 29.97 fps, but the FFMPEG and RTMP servers are getting the metadata that the frame rate is 60 fps. This causes FFMEG to encode at only half the expected bit rate. The same behavior occurs not only with FFMPEG, but also with FFMPEG2 and FFMPEG6. I would hope that if the master frame rate is 29.97 fps, both FFMPEG and metadata will correctly convey 29.97 fps and encode exactly the desired bit rate. PC OMEN16 GPU 3070 notebook GPU diver Type NVIDIA Studio driver 561.09 vMix Ver 27.0.0.69 , 27.0.0.83  sukurinsiyotuto 2024-09-25 173303.png (655kb) downloaded 7 time(s). sukurinsiyotuto 2024-09-25 174100.png (21kb) downloaded 4 time(s).
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