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Submit bugs and patches
13 avril 2011Unfortunately a software is never perfect.
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Activation de l’inscription des visiteurs
12 avril 2011, parIl est également possible d’activer l’inscription des visiteurs ce qui permettra à tout un chacun d’ouvrir soit même un compte sur le canal en question dans le cadre de projets ouverts par exemple.
Pour ce faire, il suffit d’aller dans l’espace de configuration du site en choisissant le sous menus "Gestion des utilisateurs". Le premier formulaire visible correspond à cette fonctionnalité.
Par défaut, MediaSPIP a créé lors de son initialisation un élément de menu dans le menu du haut de la page menant (...) -
Contribute to documentation
13 avril 2011Documentation is vital to the development of improved technical capabilities.
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Sur d’autres sites (10720)
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Ffmpeg examples run in debug mode [on hold]
25 août 2017, par Saeid ZangenehI’m not so professional in c and cpp. I want to run FFmpeg official examples but there are many errors on include files. I can’t solve them.
below output :when i try to run or debug the sample code
debug output :
cd '/home/saeid/NetBeansProjects/CppApplication_2'
/usr/bin/make -f Makefile CONF=Debug
"/usr/bin/make" -f nbproject/Makefile-Debug.mk QMAKE= SUBPROJECTS= .build- conf
make[1]: Entering directory '/home/saeid/NetBeansProjects
/CppApplication_2'
"/usr/bin/make" -f nbproject/Makefile-Debug.mk dist/Debug/GNU-
Linux/cppapplication_2
make[2]: Entering directory '/home/saeid/NetBeansProjects
/CppApplication_2'
mkdir -p dist/Debug/GNU-Linux
gcc -o dist/Debug/GNU-Linux/cppapplication_2 build/Debug/GNU-
Linux/sample.o
build/Debug/GNU-Linux/sample.o: In function `select_channel_layout':
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:87: undefined
reference to `av_get_channel_layout_nb_channels'
build/Debug/GNU-Linux/sample.o: In function `audio_encode_example':
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:112: undefined
reference to `avcodec_find_encoder'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:117: undefined
reference to `avcodec_alloc_context3'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:127: undefined
reference to `av_get_sample_fmt_name'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:134: undefined
reference to `av_get_channel_layout_nb_channels'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:136: undefined
reference to `avcodec_open2'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:146: undefined
reference to `av_frame_alloc'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:156: undefined
reference to `av_samples_get_buffer_size'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:162: undefined
reference to `av_malloc'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:169: undefined
reference to `avcodec_fill_audio_frame'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:179: undefined
reference to `av_init_packet'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:183: undefined
reference to `sin'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:189: undefined
reference to `avcodec_encode_audio2'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:196: undefined
reference to `av_free_packet'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:201: undefined
reference to `avcodec_encode_audio2'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:208: undefined
reference to `av_free_packet'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:212: undefined
reference to `av_freep'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:213: undefined
reference to `av_frame_free'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:214: undefined
reference to `avcodec_close'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:215: undefined
reference to `av_free'
build/Debug/GNU-Linux/sample.o: In function `audio_decode_example':
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:229: undefined
reference to `av_init_packet'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:232: undefined
reference to `avcodec_find_decoder'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:237: undefined
reference to `avcodec_alloc_context3'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:243: undefined
reference to `avcodec_open2'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:254: undefined
reference to `av_free'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:264: undefined
reference to `av_frame_alloc'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:269: undefined
reference to `avcodec_decode_audio4'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:276: undefined
reference to `av_get_bytes_per_sample'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:305: undefined reference to `avcodec_close'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:306: undefined reference to `av_free'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:307: undefined reference to `av_frame_free'build/Debug/GNU-Linux/sample.o : In function `video_encode_example’ :
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:323: undefined reference to `avcodec_find_encoder'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:328: undefined reference to `avcodec_alloc_context3'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:350: undefined reference to `av_opt_set'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:352: undefined reference to `avcodec_open2'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:361: undefined reference to `av_frame_alloc'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:371: undefined reference to `av_image_alloc'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:379: undefined reference to `av_init_packet'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:399: undefined reference to `avcodec_encode_video2'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:407: undefined reference to `av_free_packet'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:413: undefined reference to `avcodec_encode_video2'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:421: undefined reference to `av_free_packet'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:427: undefined reference to `avcodec_close'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:428: undefined reference to `av_free'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:429: undefined reference to `av_freep'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:430: undefined reference to `av_frame_free'
build/Debug/GNU-Linux/sample.o: In function `decode_write_frame':
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:452: undefined reference to `avcodec_decode_video2'build/Debug/GNU-Linux/sample.o : In function `video_decode_example’ :
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:481: undefined reference to `av_init_packet'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:486: undefined reference to `avcodec_find_decoder'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:491: undefined reference to `avcodec_alloc_context3'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:502: undefined reference to `avcodec_open2'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:511: undefined reference to `av_frame_alloc'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:545: undefined reference to `avcodec_close'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:546: undefined reference to `av_free'
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:547: undefined reference to `av_frame_free'
build/Debug/GNU-Linux/sample.o: In function `main':
/home/saeid/NetBeansProjects/CppApplication_2/sample.c:556: undefined
reference to `avcodec_register_all'
collect2: error: ld returned 1 exit status
nbproject/Makefile-Debug.mk:62: recipe for target 'dist/Debug/GNU-
Linux/cppapplication_2' failed
make[2]: *** [dist/Debug/GNU-Linux/cppapplication_2] Error 1
make[2]: Leaving directory '/home/saeid/NetBeansProjects/CppApplication_2'
nbproject/Makefile-Debug.mk:59: recipe for target '.build-conf' failed
make[1]: *** [.build-conf] Error 2
make[1]: Leaving directory '/home/saeid/NetBeansProjects/CppApplication_2'
nbproject/Makefile-impl.mk:39: recipe for target '.build-impl' failed
make: *** [.build-impl] Error 2 -
How to configure FFmpeg in windows ? [closed]
2 août 2021, par GrassWarlockHey 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


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What do I need in order to save animation videos from matplotlib in mp3 format ?
27 juin 2022, par DarthMallocI 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:
 Output file #0 does not contain any stream

 Traceback (most recent call last):
 File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 234, in saving
 yield self
 File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 1093, in save
 writer.grab_frame(**savefig_kwargs)
 File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 351, in grab_frame
 self.fig.savefig(self._proc.stdin, format=self.frame_format,
 File "/usr/local/lib/python3.8/dist-packages/matplotlib/figure.py", line 3046, in savefig
 self.canvas.print_figure(fname, **kwargs)
 File "/usr/local/lib/python3.8/dist-packages/matplotlib/backend_bases.py", line 2319, in print_figure
 result = print_method(
 File "/usr/local/lib/python3.8/dist-packages/matplotlib/backend_bases.py", line 1648, in wrapper
 return func(*args, **kwargs)
 File "/usr/local/lib/python3.8/dist-packages/matplotlib/_api/deprecation.py", line 415, in wrapper
 return func(*inner_args, **inner_kwargs)
 File "/usr/local/lib/python3.8/dist-packages/matplotlib/backends/backend_agg.py", line 486, in print_raw
 fh.write(renderer.buffer_rgba())
 BrokenPipeError: [Errno 32] Broken pipe

 During handling of the above exception, another exception occurred:

 Traceback (most recent call last):
 File "/home/justin/animation_test.py", line 36, in <module>
 ani.save("movie.mp3", writer=writer)
 File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 1093, in save
 writer.grab_frame(**savefig_kwargs)
 File "/usr/lib/python3.8/contextlib.py", line 131, in __exit__
 self.gen.throw(type, value, traceback)
 File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 236, in saving
 self.finish()
 File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 342, in finish
 self._cleanup() # Inline _cleanup() once cleanup() is removed.
 File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 373, in _cleanup
 raise subprocess.CalledProcessError(
 subprocess.CalledProcessError: Command '['ffmpeg', '-f', 'rawvideo', '-vcodec', 'rawvideo', '-s', '640x480', '-pix_fmt', 'rgba', '-r', '15', '-loglevel', 'error', '-i', 'pipe:', '-vcodec', 'h264', '-pix_fmt', 'yuv420p', '-b', '1800k', '-metadata', 'artist=Me', '-y', 'movie.mp3']' returned non-zero exit status 1.
</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.

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