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Autres articles (71)
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Des sites réalisés avec MediaSPIP
2 mai 2011, parCette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page. -
Participer à sa traduction
10 avril 2011Vous pouvez nous aider à améliorer les locutions utilisées dans le logiciel ou à traduire celui-ci dans n’importe qu’elle nouvelle langue permettant sa diffusion à de nouvelles communautés linguistiques.
Pour ce faire, on utilise l’interface de traduction de SPIP où l’ensemble des modules de langue de MediaSPIP sont à disposition. ll vous suffit de vous inscrire sur la liste de discussion des traducteurs pour demander plus d’informations.
Actuellement MediaSPIP n’est disponible qu’en français et (...) -
MediaSPIP v0.2
21 juin 2013, parMediaSPIP 0.2 est la première version de MediaSPIP stable.
Sa date de sortie officielle est le 21 juin 2013 et est annoncée ici.
Le fichier zip ici présent contient uniquement les sources de MediaSPIP en version standalone.
Comme pour la version précédente, il est nécessaire d’installer manuellement l’ensemble des dépendances logicielles sur le serveur.
Si vous souhaitez utiliser cette archive pour une installation en mode ferme, il vous faudra également procéder à d’autres modifications (...)
Sur d’autres sites (11413)
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Libav Transcoding to H264 : Frames being dropped
21 juin 2014, par romanI’m sorry if my question isn’t too well formulated, I’m only now getting started with FFmpeg and Libav. I’m not too knowledgable about media formats either, I pretty much learned all I know about the topic this past month. I’ve been doing as much research as I can, and have gotten pretty far, but I’ve only now gotten to the point where I’m almost unsure what my question actually is ! These are more like observations, but hopefully some of the experts can help me out here.
I’m trying to transcode Gifs into MP4s using FFmpeg’s libraries, but I’m running into a strange issue when using the H264 Codec. In my transcoding loop, I keep a count of the number of frames that I write out (by verifying the return value of av_write_frame). In a particular sample, I count a total of 166 frames written out. If I examine FFmpeg’s converted file using FFprobe (the functionality I’m wanting to emulate using my program, a conversion from Gif to MP4), FFmpeg’s output file also seems to have 166 frames, but when I examine my output with FFprobe, I seem to only have 144 frames. What I find a bit interesting is that if I simply change my codec from H264 to MPEG4, my output appears to have the 166 frames, matching FFmpeg’s output and my counter. I get very similar results with different Gif files, where my counter of frames written matches FFmpeg’s output’s frame count, but my output seems to drop some frames.
Encoder settings :
ostream_codec_context->codec_id = CODEC_IN_USE; //CODEC_ID_H264 or CODEC_ID_MPEG4
ostream_codec_context->pix_fmt = AV_PIX_FMT_YUV420P;
ostream_codec_context->codec_type = AVMEDIA_TYPE_VIDEO;
ostream_codec_context->flags = CODEC_FLAG_GLOBAL_HEADER;
ostream_codec_context->profile = FF_PROFILE_MPEG4_SIMPLE;
ostream_codec_context->gop_size = istream_codec_context->gop_size;
ostream_codec_context->time_base = istream_codec_context->time_base;
ostream_codec_context->width = (istream_codec_context->width / 2) * 2;
ostream_codec_context->height = (istream_codec_context->height / 2) * 2;Transcoding loop :
I’ve omitted some error-checking code and debugging statements
avformat_write_header(oformat_context, NULL);
while (av_read_frame(iformat_context, &packet) == 0 )
{
if (packet.stream_index == istream_index)
{
avcodec_decode_video2(istream_codec_context, ipicture, &full_frame, &packet);
if (full_frame)
{
sws_scale(image_conversion_context,
(uint8_t const * const *) ipicture->data,
ipicture->linesize, 0, istream_codec_context->height,
opicture->data, opicture->linesize);
opicture->pts = av_rescale_q(packet.pts, istream_codec_context->time_base,
ostream->time_base);
ret = avcodec_encode_video2(ostream_codec_context, &packet,
opicture, &got_packet);
if (!ret)
{
ret = av_write_frame(oformat_context, &packet);
if (ret < 0)
num_frames_written++;
}
}
}
av_free_packet(&packet);
av_init_packet(&packet);
}I’m also having issues with my output’s bit-rate. I can try setting it with the rest of my encoder settings, but the bit-rate that FFprobe shows is not the same as what I give the codec context. I tried setting the bit-rate to constant values just to see how it affected my output, and although my output’s bit-rate isn’t the same as what I give it, I found that my input definitely seems to influence the output’s actual bit-rate. I found a post that seems to be dealing with my issue, but the solution listed there does not seem to fix my issue.
http://ffmpeg.org/pipermail/libav-user/2012-July/002492.html
Another thing worth mentioning is that my various time bases don’t seem to match up with those of FFmpeg’s output. Notably, my output’s TBC seems to be twice the inverse of my output codec context’s time base. I’m not too sure if this is an issue with the Gif file format, my output codec context’s always seems to be set to 1/100.
Bit-rate calculation and setting
int calculated_br = istream_codec_context->time_base.den *
avpicture_get_size(AV_PIX_FMT_YUV420P, ostream_codec_context->width,
ostream_codec_context->height);
ostream_codec_context->bit_rate = calculated_br;
ostream_codec_context->rc_min_rate = calculated_br;
ostream_codec_context->rc_max_rate = calculated_br;
ostream_codec_context->rc_buffer_size = calculated_br;I’ve got a hunch that all these issues could be related to me not setting my PTS/DTS correctly, even though my output’s pts/dts values match those of FFmpeg’s output.
I would appreciate some help,
Thank you ! -
Revision cdc954fdc8 : skip the un-necessary motion search in the first pass This patch allows the VP9
16 juin 2014, par Pengchong JinChanged Paths :
Modify /vp9/encoder/vp9_firstpass.c
skip the un-necessary motion search in the first passThis patch allows the VP9 encoder to skip the un-necessary
motion search in the first pass. It computes the motion error
of 0,0 motion using the last source frame as the reference,
and skips the further motion search if this error is small.Borg test shows overall the patch gives PSNR gain (derf -0.001%,
yt 0.341%, hd 0.282%). Individual clips may have PSNR gain or
loss. The best PSNR performance is 7.347% and the worst is -0.662%.
The first pass encoding speedup for slideshow clips is over 30%.Change-Id : I4cac4dbd911f277ee858e161f3ca652c771344fe
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pip install av produces a LINK 1181 error
6 février 2020, par user8606643initially, pip install av asked me to download visual C++ 14 build tools which I did
but it is still showing me LINK 1181 errorsI need this pyAV pakcage which is obtained by pip install av for a project, but it always shows some kind of error linked with C++ and i also have ffmpeg installed.
C:\Users\manop>pip install av
Collecting av
Using cached av-7.0.0.tar.gz (2.3 MB)
Building wheels for collected packages: av
Building wheel for av (setup.py) ... error
ERROR: Command errored out with exit status 1:
command: 'c:\users\manop\appdata\local\programs\python\python37\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\manop\\AppData\\Local\\Temp\\pip-install-rydo0uqj\\av\\setup.py'"'"'; __file__='"'"'C:\\Users\\manop\\AppData\\Local\\Temp\\pip-install-rydo0uqj\\av\\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' bdist_wheel -d 'C:\Users\manop\AppData\Local\Temp\pip-wheel-oti9y28m'
cwd: C:\Users\manop\AppData\Local\Temp\pip-install-rydo0uqj\av\
Complete output (38 lines):
running bdist_wheel
running build
running build_py
creating build
creating build\lib.win-amd64-3.7
creating build\lib.win-amd64-3.7\av
copying av\datasets.py -> build\lib.win-amd64-3.7\av
copying av\deprecation.py -> build\lib.win-amd64-3.7\av
copying av\__init__.py -> build\lib.win-amd64-3.7\av
copying av\__main__.py -> build\lib.win-amd64-3.7\av
creating build\lib.win-amd64-3.7\av\audio
copying av\audio\__init__.py -> build\lib.win-amd64-3.7\av\audio
creating build\lib.win-amd64-3.7\av\codec
copying av\codec\__init__.py -> build\lib.win-amd64-3.7\av\codec
creating build\lib.win-amd64-3.7\av\container
copying av\container\__init__.py -> build\lib.win-amd64-3.7\av\container
creating build\lib.win-amd64-3.7\av\data
copying av\data\__init__.py -> build\lib.win-amd64-3.7\av\data
creating build\lib.win-amd64-3.7\av\filter
copying av\filter\__init__.py -> build\lib.win-amd64-3.7\av\filter
creating build\lib.win-amd64-3.7\av\sidedata
copying av\sidedata\__init__.py -> build\lib.win-amd64-3.7\av\sidedata
creating build\lib.win-amd64-3.7\av\subtitles
copying av\subtitles\__init__.py -> build\lib.win-amd64-3.7\av\subtitles
creating build\lib.win-amd64-3.7\av\video
copying av\video\__init__.py -> build\lib.win-amd64-3.7\av\video
running build_ext
running config
writing build\temp.win-amd64-3.7\Release\include\pyav\config.h
running cythonize
building 'av.buffer' extension
creating build\temp.win-amd64-3.7\Release\src
creating build\temp.win-amd64-3.7\Release\src\av
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.16.27023\bin\HostX64\x64\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -Ic:\users\manop\appdata\local\programs\python\python37\include -Ibuild\temp.win-amd64-3.7\Release\include -Iinclude -Ic:\users\manop\appdata\local\programs\python\python37\include -Ic:\users\manop\appdata\local\programs\python\python37\include -Ibuild\temp.win-amd64-3.7\Release\include "-IC:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.16.27023\Include" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\shared" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\um" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\winrt" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\ucrt" /Tcsrc\av\buffer.c /Fobuild\temp.win-amd64-3.7\Release\src\av\buffer.obj
buffer.c
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.16.27023\bin\HostX64\x64\link.exe /nologo /INCREMENTAL:NO /LTCG /DLL /MANIFEST:EMBED,ID=2 /MANIFESTUAC:NO /LIBPATH:c:\users\manop\appdata\local\programs\python\python37\PCbuild\amd64 /LIBPATH:c:\users\manop\appdata\local\programs\python\python37\libs /LIBPATH:c:\users\manop\appdata\local\programs\python\python37\libs /LIBPATH:c:\users\manop\appdata\local\programs\python\python37\PCbuild\amd64 "/LIBPATH:C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.16.27023\Lib\x64" "/LIBPATH:C:\Program Files (x86)\Windows Kits\10\lib\10.0.18362.0\um\x64" /LIBPATH:C:\WINDOWS\Microsoft.NET\Framework64\v4.0.30319 "/LIBPATH:C:\Program Files (x86)\Windows Kits\10\lib\10.0.18362.0\ucrt\x64" swresample.lib swscale.lib avdevice.lib avutil.lib avcodec.lib avformat.lib avfilter.lib /EXPORT:PyInit_buffer build\temp.win-amd64-3.7\Release\src\av\buffer.obj /OUT:build\lib.win-amd64-3.7\av\buffer.cp37-win_amd64.pyd /IMPLIB:build\temp.win-amd64-3.7\Release\src\av\buffer.cp37-win_amd64.lib /OPT:NOREF
LINK : fatal error LNK1181: cannot open input file 'swresample.lib'
error: command 'C:\\Program Files (x86)\\Microsoft Visual Studio\\2019\\Community\\VC\\Tools\\MSVC\\14.16.27023\\bin\\HostX64\\x64\\link.exe' failed with exit status 1181
----------------------------------------
ERROR: Failed building wheel for av
Running setup.py clean for av
Failed to build av
Installing collected packages: av
Running setup.py install for av ... error
ERROR: Command errored out with exit status 1:
command: 'c:\users\manop\appdata\local\programs\python\python37\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\manop\\AppData\\Local\\Temp\\pip-install-rydo0uqj\\av\\setup.py'"'"'; __file__='"'"'C:\\Users\\manop\\AppData\\Local\\Temp\\pip-install-rydo0uqj\\av\\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record 'C:\Users\manop\AppData\Local\Temp\pip-record-xac0xiy4\install-record.txt' --single-version-externally-managed --compile --install-headers 'c:\users\manop\appdata\local\programs\python\python37\Include\av'
cwd: C:\Users\manop\AppData\Local\Temp\pip-install-rydo0uqj\av\
Complete output (38 lines):
running install
running build
running build_py
creating build
creating build\lib.win-amd64-3.7
creating build\lib.win-amd64-3.7\av
copying av\datasets.py -> build\lib.win-amd64-3.7\av
copying av\deprecation.py -> build\lib.win-amd64-3.7\av
copying av\__init__.py -> build\lib.win-amd64-3.7\av
copying av\__main__.py -> build\lib.win-amd64-3.7\av
creating build\lib.win-amd64-3.7\av\audio
copying av\audio\__init__.py -> build\lib.win-amd64-3.7\av\audio
creating build\lib.win-amd64-3.7\av\codec
copying av\codec\__init__.py -> build\lib.win-amd64-3.7\av\codec
creating build\lib.win-amd64-3.7\av\container
copying av\container\__init__.py -> build\lib.win-amd64-3.7\av\container
creating build\lib.win-amd64-3.7\av\data
copying av\data\__init__.py -> build\lib.win-amd64-3.7\av\data
creating build\lib.win-amd64-3.7\av\filter
copying av\filter\__init__.py -> build\lib.win-amd64-3.7\av\filter
creating build\lib.win-amd64-3.7\av\sidedata
copying av\sidedata\__init__.py -> build\lib.win-amd64-3.7\av\sidedata
creating build\lib.win-amd64-3.7\av\subtitles
copying av\subtitles\__init__.py -> build\lib.win-amd64-3.7\av\subtitles
creating build\lib.win-amd64-3.7\av\video
copying av\video\__init__.py -> build\lib.win-amd64-3.7\av\video
running build_ext
running config
writing build\temp.win-amd64-3.7\Release\include\pyav\config.h
running cythonize
building 'av.buffer' extension
creating build\temp.win-amd64-3.7\Release\src
creating build\temp.win-amd64-3.7\Release\src\av
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.16.27023\bin\HostX64\x64\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -Ibuild\temp.win-amd64-3.7\Release\include -Iinclude -Ic:\users\manop\appdata\local\programs\python\python37\include -Ic:\users\manop\appdata\local\programs\python\python37\include -Ic:\users\manop\appdata\local\programs\python\python37\include -Ibuild\temp.win-amd64-3.7\Release\include "-IC:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.16.27023\Include" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\shared" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\um" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\winrt" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\ucrt" /Tcsrc\av\buffer.c /Fobuild\temp.win-amd64-3.7\Release\src\av\buffer.obj
buffer.c
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.16.27023\bin\HostX64\x64\link.exe /nologo /INCREMENTAL:NO /LTCG /DLL /MANIFEST:EMBED,ID=2 /MANIFESTUAC:NO /LIBPATH:c:\users\manop\appdata\local\programs\python\python37\PCbuild\amd64 /LIBPATH:c:\users\manop\appdata\local\programs\python\python37\libs /LIBPATH:c:\users\manop\appdata\local\programs\python\python37\libs /LIBPATH:c:\users\manop\appdata\local\programs\python\python37\PCbuild\amd64 "/LIBPATH:C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.16.27023\Lib\x64" "/LIBPATH:C:\Program Files (x86)\Windows Kits\10\lib\10.0.18362.0\um\x64" /LIBPATH:C:\WINDOWS\Microsoft.NET\Framework64\v4.0.30319 "/LIBPATH:C:\Program Files (x86)\Windows Kits\10\lib\10.0.18362.0\ucrt\x64" avutil.lib avfilter.lib swresample.lib swscale.lib avformat.lib avcodec.lib avdevice.lib /EXPORT:PyInit_buffer build\temp.win-amd64-3.7\Release\src\av\buffer.obj /OUT:build\lib.win-amd64-3.7\av\buffer.cp37-win_amd64.pyd /IMPLIB:build\temp.win-amd64-3.7\Release\src\av\buffer.cp37-win_amd64.lib /OPT:NOREF
LINK : fatal error LNK1181: cannot open input file 'avutil.lib'
error: command 'C:\\Program Files (x86)\\Microsoft Visual Studio\\2019\\Community\\VC\\Tools\\MSVC\\14.16.27023\\bin\\HostX64\\x64\\link.exe' failed with exit status 1181
----------------------------------------
ERROR: Command errored out with exit status 1: 'c:\users\manop\appdata\local\programs\python\python37\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\manop\\AppData\\Local\\Temp\\pip-install-rydo0uqj\\av\\setup.py'"'"'; __file__='"'"'C:\\Users\\manop\\AppData\\Local\\Temp\\pip-install-rydo0uqj\\av\\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record 'C:\Users\manop\AppData\Local\Temp\pip-record-xac0xiy4\install-record.txt' --single-version-externally-managed --compile --install-headers 'c:\users\manop\appdata\local\programs\python\python37\Include\av' Check the logs for full command output.These are my visual C++ selections :
my visual studio installer individual components selection
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