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• 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.

  


• 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

  


• How to configure FFmpeg in windows ? [closed]

  2 août 2021, par GrassWarlock

  Hey there i'm not very tech savvy.

  


  when i invoke this command :

  


  ffmpeg -i input.mp4 -i subtitles.srt -map 0 -map 1 -c copy -c:v libx264 -crf 23 -preset veryfast output.mp4


  


  ( which is supposed to overlay 'input.mp4' with subtitles from 'subtitle.srt' )

  


  i get the following output :

  


  ffmpeg version 2021-07-27-git-0068b3d0f0-full_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.3.0 (Rev5, 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-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --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-libglslang --enable-vulkan --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      57.  2.100 / 57.  2.100
  libavcodec     59.  3.102 / 59.  3.102
  libavformat    59.  4.101 / 59.  4.101
  libavdevice    59.  0.100 / 59.  0.100
  libavfilter     8.  1.103 /  8.  1.103
  libswscale      6.  0.100 /  6.  0.100
  libswresample   4.  0.100 /  4.  0.100
  libpostproc    56.  0.100 / 56.  0.100
Input #0, matroska,webm, from 'video.mkv':
  Metadata:
    ENCODER         : Lavf59.4.101
  Duration: 00:05:39.94, start: 0.000000, bitrate: 665 kb/s
  Stream #0:0(eng): Video: vp9 (Profile 0), yuv420p(tv), 720x480, SAR 1:1 DAR 3:2, 29.97 fps, 29.97 tbr, 1k tbn (default)
    Metadata:
      DURATION        : 00:05:39.839000000
  Stream #0:1: Audio: aac (LC), 44100 Hz, stereo, fltp (default)
    Metadata:
      HANDLER_NAME    : SoundHandler
      VENDOR_ID       : [0][0][0][0]
      DURATION        : 00:05:39.940000000
Input #1, srt, from 'subtitles.srt':
  Duration: N/A, bitrate: N/A
  Stream #1:0: Subtitle: subrip
[mp4 @ 000001aa596242c0] Could not find tag for codec subrip in stream #2, codec not currently supported in container
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:2 --
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


  


  i searched the internet and the official documentation mentions that libass should be enabled in the configuration in order for subtitling to work

  


  


  11.218 subtitles

  


  Draw subtitles on top of input video using the libass library.

  


  To enable compilation of this filter you need to configure FFmpeg with
—enable-libass. This filter also requires a build with libavcodec and libavformat to convert the passed subtitles file to ASS (Advanced
Substation Alpha) subtitles format

  


  


  how do i enable libass in configuration on windows ? my FFmpeg directory doesn't contain a configuration file nor a command that configures it from cmd

  


  Thanks alot in advance