Recherche avancée

Sur d’autres sites (11444)

• Problems linking to FFMPEG library in Visual Studio 2010

  11 décembre 2013, par Dídac Pérez

  I have cross-compiled FFMPEG from Debian using the mingw32 toolchain. The result of the compilation is a set of .a files. When I try to use them in my project I get linker errors, concretely the following ones :

  1>RTSPCapture.obj : error LNK2019: unresolved external symbol _avformat_free_context referenced in function ...
  
  1>RTSPCapture.obj : error LNK2019: unresolved external symbol _avio_close referenced in function ...
  
  1>RTSPCapture.obj : error LNK2019: unresolved external symbol _avcodec_close referenced in function ...
  
  (and much more...)

  I have already included the header files like this :

  extern "C"
  
  {
  
      #include <libavcodec></libavcodec>avcodec.h>
  
      #include <libavformat></libavformat>avformat.h>
  
      #include <libavformat></libavformat>avio.h>
  
  }

  And I use the .a files like this :

  #pragma comment(lib, "libavcodec.a")
  
  #pragma comment(lib, "libavformat.a")
  
  #pragma comment(lib, "libavutil.a")

  May I know why I am still getting linker errors ? Best regards,

  EDIT : I have realized that this is not possible. So, what should I do to use FFMPEG library in my MSVC2010 project taking into account that I can't compile ffmpeg in Windows ? it seems to be REALLY difficult...

• 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.

  


• I could not encode using the Intel® Media Server Studio on the ZOTAC ZBOX PI225

  22 avril 2018, par Ubunkun

  I’ve succeeded to install the Intel® Media Server Studio to the
  ZOTAC ZBOX PI225. And, I’ve built the ffmepg as following.

  $ ffmpeg -codecs | grep qsv
  
  ffmpeg version N-90764-g396c019 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-16)
  
    configuration: --enable-libmfx
  
    libavutil      56. 15.100 / 56. 15.100
  
    libavcodec     58. 19.100 / 58. 19.100
  
    libavformat    58. 13.100 / 58. 13.100
  
    libavdevice    58.  4.100 / 58.  4.100
  
    libavfilter     7. 18.100 /  7. 18.100
  
    libswscale      5.  2.100 /  5.  2.100
  
    libswresample   3.  2.100 /  3.  2.100
  
   DEV.LS h264                 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (decoders: h264 h264_qsv ) (encoders: h264_qsv h264_vaapi )
  
   DEV.L. hevc                 H.265 / HEVC (High Efficiency Video Coding) (decoders: hevc hevc_qsv ) (encoders: hevc_qsv hevc_vaapi )
  
   DEVIL. mjpeg                Motion JPEG (encoders: mjpeg mjpeg_qsv mjpeg_vaapi )
  
   DEV.L. mpeg2video           MPEG-2 video (decoders: mpeg2video mpegvideo mpeg2_qsv ) (encoders: mpeg2video mpeg2_qsv mpeg2_vaapi )
  
   D.V.L. vc1                  SMPTE VC-1 (decoders: vc1 vc1_qsv )
  
   DEV.L. vp8                  On2 VP8 (decoders: vp8 vp8_qsv ) (encoders: vp8_vaapi )

  When I’ve tried to encode using ffmpeg, but It occurred error as below.

   $ ffmpeg -i original.avi -c:v h264_qsv -profile:v main -b:v 2000k -r 30 -s 1280x720  -look_ahead 0 qsv.mp4
  
  ffmpeg version N-90764-g396c019 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-16)
  
    configuration: --enable-libmfx
  
    libavutil      56. 15.100 / 56. 15.100
  
    libavcodec     58. 19.100 / 58. 19.100
  
    libavformat    58. 13.100 / 58. 13.100
  
    libavdevice    58.  4.100 / 58.  4.100
  
    libavfilter     7. 18.100 /  7. 18.100
  
    libswscale      5.  2.100 /  5.  2.100
  
    libswresample   3.  2.100 /  3.  2.100
  
  Input #0, avi, from 'original.avi':
  
    Metadata:
  
      encoder         : FairUse Wizard - http://fairusewizard.com
  
    Duration: 01:41:12.11, start: 0.000000, bitrate: 965 kb/s
  
      Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 592x304 [SAR 1:1 DAR 37:19], 828 kb/s, 23.98 fps, 23.98 tbr, 23.98 tbn, 23.98 tbc
  
      Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, fltp, 128 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mpeg4 (native) -> h264 (h264_qsv))
  
    Stream #0:1 -> #0:1 (mp3 (mp3float) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  [mpeg4 @ 0x2fe5700] Video uses a non-standard and wasteful way to store B-frames ('packed B-frames'). Consider using the mpeg4_unpack_bframes bitstream filter without encoding but stream copy to fix it.
  
  [h264_qsv @ 0x2fce7c0] Encoder will work with partial HW acceleration
  
  [h264_qsv @ 0x2fce7c0] Error initializing the encoder: invalid video parameters (-15)
  
  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 @ 0x2ff0e00] Qavg: 14764.986
  
  [aac @ 0x2ff0e00] 2 frames left in the queue on closing
  
  Conversion failed!

  It seems like that something of parameter missing, I think.

  If you have an idea to solve this, let me know.

  Bests,