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• Python librosa NoBackendError even though ffmpeg is installed

  11 avril 2020, par Slavko Kovačević

  I recently installed librosa (package I've been using for a while on different PC) on my new PC with Windows 10 running. After that I've downloaded latest static version of ffmpeg and copied it to C: and added it to the Path. Tested ffmpeg and it works like a charm ! For python I am using Anaconda environment and after starting Jupyter Notebook and running librosa.load(path, sr = None) I've got

  



   in <module>&#xA;----> 1 audio = librosa.load(pathToJson)&#xA;&#xA;~\anaconda3\envs\tf_gpu\lib\site-packages\librosa\core\audio.py in load(path, sr, mono, offset, duration, dtype, res_type)&#xA;    117 &#xA;    118     y = []&#xA;--> 119     with audioread.audio_open(os.path.realpath(path)) as input_file:&#xA;    120         sr_native = input_file.samplerate&#xA;    121         n_channels = input_file.channels&#xA;&#xA;~\anaconda3\envs\tf_gpu\lib\site-packages\audioread\__init__.py in audio_open(path, backends)&#xA;    114 &#xA;    115     # All backends failed!&#xA;--> 116     raise NoBackendError()&#xA;&#xA;NoBackendError:&#xA;</module>

  



  strange isn't it ? Then I went all over the internet, doing whatnot trying to fix it and then I've got an idea to run my line of code inside anaconda command interface and it WORKS ?? How is this possible ? It is the same environment.

  



  python
Python 3.7.7 (default, Mar 23 2020, 23:19:08) [MSC v.1916 64 bit (AMD64)] :: Anaconda, Inc. on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import librosa
>>> librosa.load('test.wav')
(array([-0.00027   , -0.00039953, -0.0003659 , ..., -0.16393574,
       -0.17814247,  0.        ], dtype=float32), 22050)


  



  I did a lot of testing and I really prefer my Jupyter so any help would be appreciated. I tried the following : I've added C:\ffmpeg\bin and C:\ffmpeg to my Path for both User and System Variables. After that I've made specific variables for ffmpeg and ffmpeg_bin for both User and System Variables. No luck. After that I've tried installing ffmpeg using conda, without success. The last thing I've tested is this :

  



  import audioread
audioread.ffdec.FFmpegAudioFile('test.wav')


  



  and that works. Thanks

  


• ERROR : Could not write header for output file #0 (incorrect codec parameters ?) : Invalid argument

  13 octobre 2019, par timofischerprojects

  I want to replace the audio stream in a Video-DVD. But I have problems with the replace of the audio stream.

  The DVD-VOB have 3 streams.
  Stream 0 is dvd_nav_packet.
  Stream 1 is the video.
  Stream 2 is the audio.

  I also tryed to change the exportinformation for ffmepg with -map 0:d and -map 0:d:1. Also with and without from the codec Infos -f vob -target ntsc-dvd -vcodec copy -acodec copy. And update ffmpeag/use older versions. But I only get error messages.

  ffmpeg is startet with a vb.net Programm which which decide which video need a new audio file.

  Can somebody tell me what I do wrong ?

  ffmpeg.exe -i "F:\VIDEO_TS\VTS_01_1.VOB" -i "%CD%\tfpat.mp2" -map 0:0 -map 0:1 -map 1:0 -f vob -target ntsc-dvd -vcodec copy -acodec copy "C:\Users\Timo\AppData\Local\Microsoft\Windows\Burn\Burn\VIDEO_TS\VTS_01_1.VOB"
  
  
  
  
  
  ffmpeg version N-88514-gd5995c531d Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth --enable-libmfx
  
    libavutil      56.  0.100 / 56.  0.100
  
    libavcodec     58.  1.100 / 58.  1.100
  
    libavformat    58.  0.102 / 58.  0.102
  
    libavdevice    58.  0.100 / 58.  0.100
  
    libavfilter     7.  0.101 /  7.  0.101
  
    libswscale      5.  0.101 /  5.  0.101
  
    libswresample   3.  0.101 /  3.  0.101
  
    libpostproc    55.  0.100 / 55.  0.100
  
  Input #0, mpeg, from 'F:\VIDEO_TS\VTS_01_1.VOB':
  
    Duration: 00:01:51.17, start: 0.300300, bitrate: 7273 kb/s
  
      Stream #0:0[0x1bf]: Data: dvd_nav_packet
  
      Stream #0:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, progressive), 720x480 [SAR 32:27 DAR 16:9], 6800 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
  
      Stream #0:2[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 320 kb/s
  
  [ac3 @ 037ee700] Estimating duration from bitrate, this may be inaccurate
  
  Input #1, ac3, from 'D:\SkyDrive\Projekte\AtmosFX_Syncro_Projekt\AtmosFX-Translator\AlteVersionen\Version 2\tfpat.mp2':
  
    Duration: 00:01:51.26, start: 0.000000, bitrate: 320 kb/s
  
      Stream #1:0: Audio: ac3, 48000 Hz, stereo, fltp, 320 kb/s
  
  File 'C:\Users\Timo\AppData\Local\Microsoft\Windows\Burn\Burn\VIDEO_TS\VTS_01_1.VOB' already exists. Overwrite ? [y/N] y
  
  [dvd @ 037fbd20] Invalid media type data for output stream #0
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
    Stream #1:0 -> #0:2 (copy)
  
      Last message repeated 1 times

• libavfilter/dnn : avoid memcpy for tensorflow dnn output

  25 avril 2019, par Guo, Yejun

  libavfilter/dnn : avoid memcpy for tensorflow dnn output
  use TF_Tensor's cpu address to avoid extra memcpy.
  Signed-off-by : Guo, Yejun <yejun.guo@intel.com>
  
  Signed-off-by : Pedro Arthur <bygrandao@gmail.com>
  

  • [DH] libavfilter/dnn_backend_tf.c
  • [DH] libavfilter/vf_sr.c