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• ffmpeg error with device when transcoding from HEVC to H.264 on GPU using NVENC [closed]

  5 décembre 2022, par Slakter

  I wanted to transcode my videos that have hevc encoding into h.264 using ffmpeg with Nvidia CUDA acceleration.
Basically I've followed the guide provided in the official documentation and read through CUDA part in here

  


  My GPU is GeForce RTX2060 and the OS is Windows 10

  


  ffmpeg configuration just after start says :

  


  ffmpeg version 5.1.2-essentials_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 12.1.0 (Rev2, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100


  


  So all the required options for Nvidia encoding are in the list.

  


  Then I tried to transcode a video in mkv format with encoding H.265 (hevc) into h.264 using h264_nvenc .
Here is the line

  


   ffmpeg -hwaccel cuda -hwaccel_device 0 -hwaccel_output_format cuda -extra_hw_frames 14 -i .\input.mkv -c:v h264_nvenc -profile:v high444p -pixel_format yuva444p16le -preset lossless -b:v 1M output.mp4 -y


  


  Even when I leave just this, the error is the same

  


   ffmpeg -hwaccel cuda -hwaccel_device 0 -hwaccel_output_format cuda -i .\Violet1.mkv -c:v h264_nvenc output.mp4 -y


  


  Here is the error message :

  


  Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> h264 (h264_nvenc))
  Stream #0:1 -> #0:1 (opus (native) -> aac (native))
Press [q] to stop, [?] for help
[h264_nvenc @ 000002023642d7c0] 10 bit encode not supported
[h264_nvenc @ 000002023642d7c0] Provided device doesn't support required NVENC features
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


  


  Also, If I take another file with encoding H.265 (hev1) in mp4 format and use the command below, then it works fine.

  


  ffmpeg -hwaccel cuda -hwaccel_device 0 -hwaccel_output_format cuda -extra_hw_frames 5 -i .\hev1.mp4 -gpu 0 -c:v h264_nvenc -profile:v high444p -preset lossless -b:v 1M output.mp4 -y


  


  It's the same as the first command but with different extra_hw_frames and output file

  


  My guess is that the problem in encoding from mkv or hevc codec specifically or maybe I have to change some options, but I haven't found anything about this error in the net. Thanks everyone how could help

  


• What do I need in order to save animation videos from matplotlib in mp3 format ?

  27 juin 2022, par DarthMalloc

  I am using python3.8 on Linux Mint 19.3, and I am trying to save an animation created by a cellular automata model in matplotlib. My actual code for the model is private, but it uses the same code for saving the animation as the code shown below, which is a slight modification of one of the examples shown in the official matplotlib documentation :

  


  import numpy as np
import matplotlib.pyplot as plt
import matplotlib.animation as animation

fig, ax = plt.subplots()


def f(x, y):
    return np.sin(x) + np.cos(y)

x = np.linspace(0, 2 * np.pi, 120)
y = np.linspace(0, 2 * np.pi, 100).reshape(-1, 1)

fig, ax = plt.subplots()


    
ims = []
for i in range(60):
    x += np.pi / 15.
    y += np.pi / 20.
    im = ax.imshow(f(x, y), animated=True)
    if i == 0:
        ax.imshow(f(x, y))  # show an initial one first
    ims.append([im])

ani = animation.ArtistAnimation(fig, ims, interval=50, blit=True,
                                    repeat_delay=1000)

    # To save the animation, use e.g.
    #
    # ani.save("movie.mp4")
    #
    # or
    #
writer = animation.FFMpegWriter(fps=15, metadata=dict(artist='Me'), bitrate=1800)
ani.save("movie.mp3", writer=writer)


  


  When executed, the code produces this error :

  


      MovieWriter stderr:&#xA;    Output file #0 does not contain any stream&#xA;&#xA;    Traceback (most recent call last):&#xA;      File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 234, in saving&#xA;        yield self&#xA;      File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 1093, in save&#xA;        writer.grab_frame(**savefig_kwargs)&#xA;      File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 351, in grab_frame&#xA;        self.fig.savefig(self._proc.stdin, format=self.frame_format,&#xA;      File "/usr/local/lib/python3.8/dist-packages/matplotlib/figure.py", line 3046, in savefig&#xA;        self.canvas.print_figure(fname, **kwargs)&#xA;      File "/usr/local/lib/python3.8/dist-packages/matplotlib/backend_bases.py", line 2319, in print_figure&#xA;        result = print_method(&#xA;      File "/usr/local/lib/python3.8/dist-packages/matplotlib/backend_bases.py", line 1648, in wrapper&#xA;        return func(*args, **kwargs)&#xA;      File "/usr/local/lib/python3.8/dist-packages/matplotlib/_api/deprecation.py", line 415, in wrapper&#xA;        return func(*inner_args, **inner_kwargs)&#xA;      File "/usr/local/lib/python3.8/dist-packages/matplotlib/backends/backend_agg.py", line 486, in print_raw&#xA;        fh.write(renderer.buffer_rgba())&#xA;    BrokenPipeError: [Errno 32] Broken pipe&#xA;&#xA;    During handling of the above exception, another exception occurred:&#xA;&#xA;    Traceback (most recent call last):&#xA;      File "/home/justin/animation_test.py", line 36, in <module>&#xA;        ani.save("movie.mp3", writer=writer)&#xA;      File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 1093, in save&#xA;        writer.grab_frame(**savefig_kwargs)&#xA;      File "/usr/lib/python3.8/contextlib.py", line 131, in __exit__&#xA;        self.gen.throw(type, value, traceback)&#xA;      File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 236, in saving&#xA;        self.finish()&#xA;      File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 342, in finish&#xA;        self._cleanup()  # Inline _cleanup() once cleanup() is removed.&#xA;      File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 373, in _cleanup&#xA;        raise subprocess.CalledProcessError(&#xA;    subprocess.CalledProcessError: Command &#x27;[&#x27;ffmpeg&#x27;, &#x27;-f&#x27;, &#x27;rawvideo&#x27;, &#x27;-vcodec&#x27;, &#x27;rawvideo&#x27;, &#x27;-s&#x27;, &#x27;640x480&#x27;, &#x27;-pix_fmt&#x27;, &#x27;rgba&#x27;, &#x27;-r&#x27;, &#x27;15&#x27;, &#x27;-loglevel&#x27;, &#x27;error&#x27;, &#x27;-i&#x27;, &#x27;pipe:&#x27;, &#x27;-vcodec&#x27;, &#x27;h264&#x27;, &#x27;-pix_fmt&#x27;, &#x27;yuv420p&#x27;, &#x27;-b&#x27;, &#x27;1800k&#x27;, &#x27;-metadata&#x27;, &#x27;artist=Me&#x27;, &#x27;-y&#x27;, &#x27;movie.mp3&#x27;]&#x27; returned non-zero exit status 1.&#xA;</module>

  


  I have looked at posts on similar queries concerning matplotlib animations, but none have specifically included the error Output file #0 does not contain any stream. I have little experience with ffmpeg, so I am wondering what might be missing.

  


• How can a desktop node.js app play audio that may be controlled by the user like a media player ? [closed]

  19 février, par eedefeed

  I'm building a playlist manager that plays music. How can Node.JS play audio files quickly, reliably and with all the basic level features you would expect from a media player, namely :

  


  

  • play

  


  • pause

  


  • seek

  


  • stop

  


  • adjust volume

  


  


  I'm targetting windows/linux, but a Windows-only solution but be okay (for now.)

  


  I have tried a number of libraries and methods to play audio but it seems none of them are good enough :

  


  

  • Audic : it's reasonably good, but buggy. The play and pause functions sometimes get switched around. I also recall that there are some issues with uncaught exceptions somewhere in the dependencies that crash the entire app.

  


  • OBS : since the app is designed with broadcasting in mind, I've tried to use OBS's API to get it to play media. Unfortunately, it sometimes stops playback during some tracks, which is surprising since its underlying library, FFmpeg, plays them without issue.

  


  • node-groove : seems like its underlying library, libgroove, only supports linux. I can't find any builds to download, regardless.

  


  


  Attempts to use Speaker (which seems pretty good) have also failed because all the decoders have big issues :

  


  

  • Anything using lame - I want support for all audio, not specific formats.

  


  • fluent-FFmpeg - this is a wrapper around FFmpeg's CLI interface. It has no play/pause function, but bonus library fluent-FFmpeg-util adds this feature. Unfortunately, its pause takes about 4 seconds to work, which I'm guessing is to do with a buffer being exhausted. This is just too latent. Seek would also work by stopping the CLI process and reloading the file, which seems massively inefficient.

  


  • Node Vlc - promising but ancient library that gives me reams of node-gyp errors on install. Poorly documented and no explanation of what the library to do

  


  • VLC Client - this library has uncaught exceptions that crash the app. Wrapping in try/catch doesn't help.

  


  • sound play - doesn't support play/pause

  


  


  NPM's search function is filled with audio players designed to work in browsers, but I'm not building a web app. I guess it's an option but it seems inelegant to the point of rediculous.

  


  So it seems the best option centres around FFmpeg. FFmpeg has libraries, and I'm aware that node has ways to hook into those libraries via some sort of C or C++ compatibility layer. Unfortunately, official documentation is rather dense. Different unofficial guides seem to be recommending conflicting approaches (and might be dated), and it's difficult to work out whether myriad technologies are working in tandem or are alternatives, renames or replacements : node-gyp, node-api, addons, windows-build-tools, nan, C vs C++, Visual Studio. It's difficult to make any decisions or know where to start.

  


  Perhaps, also, another option is to use a Python library to interact with FFmpeg, since initial searches have indicated this might be possible. I wouldn't know whether this is a good option.

  


  So my question is : what's my best option to play audio ? Is it another NPM module that I'm not aware of ? Is it a compatibility layer with FFmpeg libraries ?