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• Why this ffmpeg mp4/mkv/wmv/flv/avi to webm command line with cuda is as slow as with CPU ?

  2 février 2023, par uchi

  im playing with my video files, I want to convert them from mp4, mkv, wmv, avi, flv, mov... to webm.

  


  So I have written this :

  


  for file in *
    do   
if [ -f "$file" ]
    then     filename="${file%.*}"
    ../ffmpeg -hwaccel nvdec -hwaccel_device 0 -hwaccel_output_format cuda -i "$file" -c:v vp9 -b:v 0 -crf 31 -c:a libvorbis "$filename".webm
fi
done


  


  As shown, I have compiler my own ffmpeg binary, with those options :

  


  ./configure --enable-gpl --enable-libx264 --enable-nonfree --enable-cuda-nvcc --enable-libvpx --enable-vaapi --enable-libvorbis  --enable-libnpp --extra-cflags=-I/usr/local/cuda/include --extra-ldflags=-L/usr/local/cuda/lib64


  


  It works, but, with CPU I got speed 0,1x and with cuda... almost the same.

  


  My CPU ? 11th Gen Intel(R) Core(TM) i7-11800H

  


  My GPU ? GeForce RTX™ 3060 mobile

  


  Filesize ? 300-3000mb (same speed with any)

  


  Is there anything I could do ? (I also tried vp9_vaapi, getting

  


  Impossible to convert between the formats supported by the filter 'Parsed_null_0' and the filter 'auto_scale_0'
Error reinitializing filters!
Failed to inject frame into filter network: Function not implemented


  


  Any clue ? Or do I have to give up ?

  


  Thanks

  


• FFmpeg returning error when obs studio tries to enable NVENC

  20 octobre 2022, par Qwerty_PLM

  Apparently the error in obs is "Failed to open NVENC codec : generic error in an external library". I'm using ffmpeg nvenc encoder. the log shows the following lines.

  


  [h264_nvenc @ 0x56341a8cdf40] The selected preset is deprecated. Use p1 to p7 + -tune or fast/medium/slow.
[h264_nvenc @ 0x56341a8cdf40] OpenEncodeSessionEx failed: out of memory (10): (no details)
[h264_nvenc @ 0x56341a8cdf40] No capable devices found


  


  When I run nvidia-smi, the result is below

  


  -----------------------------------------------------------------------------+
| NVIDIA-SMI 520.56.06    Driver Version: 520.56.06    CUDA Version: 11.8     |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|                               |                      |               MIG M. |
|===============================+======================+======================|
|   0  NVIDIA GeForce ...  Off  | 00000000:01:00.0 Off |                  N/A |
| N/A   54C    P5    21W /  N/A |     58MiB /  8192MiB |     26%      Default |
|                               |                      |                  N/A |
+-------------------------------+----------------------+----------------------+
                                                                               
+-----------------------------------------------------------------------------+
| Processes:                                                                  |
|  GPU   GI   CI        PID   Type   Process name                  GPU Memory |
|        ID   ID                                                   Usage      |
|=============================================================================|
|    0   N/A  N/A      5595      G   /usr/lib/Xorg                      12MiB |
|    0   N/A  N/A     15882      G   obs                                44MiB |
+-----------------------------------------------------------------------------+



  


  My environment :

  


  

  • Arch linux with kernel 6.0.2

  


  • RTX 3070 laptop
I hope to find an solution to allow me to use nvenc encoding for recording videos.

  


  


  Software encoding does work, but I'm using a laptop cpu which provides poor performance.

  


  UPD : applying the patch from https://github.com/keylase/nvidia-patch worked but I want to know why it didn't work before because I've never run any process that uses nvenc, and the patch only enables multiple nvenc sessions.

  


• ffmpeg h264_nvenc force level=41

  9 octobre 2022, par Mauro

  I have some videos at 1080p 60fps.

  


  These videos are with level=50 and my TV plays only videos up to level=41, so I want to convert my videos using ffmpeg and hardware acceleration.

  


  I have a Windows 10 machine with ffmpeg and Geforce 2060, so I try run below command :

  


  ffmpeg -i video.mp4 -vcodec h264_nvenc -preset slow -level 4.1 output.mp4


  


  but I get this error :

  


  [h264_nvenc @ 000001dd43cd07c0] InitializeEncoder failed : invalid param (8) : Invalid Level.
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

  


  When I try to run the same command above using "-level 4.2" or above, the encode process works ! But it is useless for me, because I really need "-level 4.1".

  


  I noticed that if use libx264 instead of h264_nvenc, the encode process accepts "-level 4.1", but it take too long to complete (I want to enjoy hardware acceleration instead of CPU).

  


  How can I force h264_nvenc to accept "level=4.1" ?