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Organiser par catégorie
17 mai 2013, parDans MédiaSPIP, une rubrique a 2 noms : catégorie et rubrique.
Les différents documents stockés dans MédiaSPIP peuvent être rangés dans différentes catégories. On peut créer une catégorie en cliquant sur "publier une catégorie" dans le menu publier en haut à droite ( après authentification ). Une catégorie peut être rangée dans une autre catégorie aussi ce qui fait qu’on peut construire une arborescence de catégories.
Lors de la publication prochaine d’un document, la nouvelle catégorie créée sera proposée (...) -
Récupération d’informations sur le site maître à l’installation d’une instance
26 novembre 2010, parUtilité
Sur le site principal, une instance de mutualisation est définie par plusieurs choses : Les données dans la table spip_mutus ; Son logo ; Son auteur principal (id_admin dans la table spip_mutus correspondant à un id_auteur de la table spip_auteurs)qui sera le seul à pouvoir créer définitivement l’instance de mutualisation ;
Il peut donc être tout à fait judicieux de vouloir récupérer certaines de ces informations afin de compléter l’installation d’une instance pour, par exemple : récupérer le (...) -
Publier sur MédiaSpip
13 juin 2013Puis-je poster des contenus à partir d’une tablette Ipad ?
Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir
Sur d’autres sites (5878)
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ffmpeg error "Could not write header for output file #0 (incorrect codec parameters ?) : Operation not permitted Error initializing output stream 0:0"
27 juillet 2022, par DevSharmaI am running FFmpeg in my app and specifically in "Android 11" I am getting this error from several users


I have researched a lot but no solution found.


I thought there is something wrong with the codec parameter that is being passed since it is saying "incorrect codec parameters" but most of the parameters looks good.


also verified if all the required file permission are granted and those are good too


now I m unable to find the problem,


please help, thanks


Command:
/data/app/~~hyrHVcslcfdQcguX0rauRA==/<apppackage>-QbDCul7FXU4tVniSDeP1Sg==/lib/arm64/libffmpeg.so -i /storage/emulated/0/Android/media/com.whatsapp/WhatsApp/Media/WhatsApp Video/VID-20220414-WA0010.mp4 -c:v libx264 -crf 23 -map 0:V -map 0:a? -map 0:s? -c:s mov_text -segment_time 26 -g 26 -sc_threshold 0 -force_key_frames expr:gte(t,n_forced*26) -reset_timestamps 1 -f segment -preset ultrafast /storage/emulated/0/Movies/splitVideoFolder/split_video%03d.mp4

Error:
ffmpeg version v4.4-dev-416 Copyright (c) 2000-2020 the FFmpeg developers
 built with Android (6454773 based on r365631c2) clang version 9.0.8 (https://android.googlesource.com/toolchain/llvm-project 98c855489587874b2a325e7a516b99d838599c6f) (based on LLVM 9.0.8svn)
 configuration: --cross-prefix=aarch64-linux-android- --sysroot=/Users/admin/AndroidStudioProjects/android-ndk-r21d/toolchains/llvm/prebuilt/darwin-x86_64/sysroot --prefix=/Users/admin/AndroidStudioProjects/Tanner/mobile-ffmpeg/prebuilt/android-arm64/ffmpeg --pkg-config=/usr/local/bin/pkg-config --enable-version3 --arch=aarch64 --cpu=armv8-a --cc=aarch64-linux-android21-clang --cxx=aarch64-linux-android21-clang++ --extra-libs='-L/Users/admin/AndroidStudioProjects/Tanner/mobile-ffmpeg/prebuilt/android-arm64/cpu-features/lib -lndk_compat' --target-os=android --enable-neon --enable-asm --enable-inline-asm --enable-cross-compile --enable-pic --enable-jni --enable-optimizations --enable-swscale --disable-shared --disable-ffplay --enable-v4l2-m2m --disable-outdev=fbdev --disable-indev=fbdev --enable-small --disable-openssl --disable-xmm-clobber-test --disable-debug --enable-lto --disable-neon-clobber-test --disable-postproc --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --enable-static --disable-sndio --disable-schannel --disable-securetransport --disable-xlib --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --disable-videotoolbox --disable-audiotoolbox --disable-appkit --disable-alsa --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-libass --enable-iconv --enable-libx264 --enable-gpl --disable-sdl2 --enable-zlib --enable-mediacodec
 libavutil 56. 55.100 / 56. 55.100
 libavcodec 58. 96.100 / 58. 96.100
 libavformat 58. 48.100 / 58. 48.100
 libavdevice 58. 11.101 / 58. 11.101
 libavfilter 7. 87.100 / 7. 87.100
 libswscale 5. 8.100 / 5. 8.100
 libswresample 3. 8.100 / 3. 8.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Android/media/com.whatsapp/WhatsApp/Media/WhatsApp Video/VID-20220414-WA0010.mp4':
 Metadata:
 major_brand : mp42
 minor_version : 0
 compatible_brands: mp42isom
 Duration: 00:01:30.53, start: 0.000000, bitrate: 671 kb/s
 Stream #0:0(und): Video: h264 (avc1 / 0x31637661), yuv420p(tv, smpte170m/bt470bg/smpte170m), 576x1024 [SAR 1:1 DAR 9:16], 539 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
 Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
Stream mapping:
 Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
 Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 0xb400007727c64800] using SAR=1/1
[libx264 @ 0xb400007727c64800] using cpu capabilities: ARMv8 NEON
[libx264 @ 0xb400007727c64800] profile Constrained Baseline, level 3.1, 4:2:0, 8-bit
[libx264 @ 0xb400007727c64800] 264 - core 160 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=26 keyint_min=2 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
[segment @ 0xb400007727c28800] Opening '/storage/emulated/0/Movies/splitVideoFolder/split_video000.mp4' for writing
[segment @ 0xb400007727c28800] Failed to open segment '/storage/emulated/0/Movies/splitVideoFolder/split_video000.mp4'
Could not write header for output file #0 (incorrect codec parameters ?): Operation not permitted
Error initializing output stream 0:0 --
[aac @ 0xb400007727c65700] Qavg: 18220.703
[aac @ 0xb400007727c65700] 2 frames left in the queue on closing
Conversion failed!
</apppackage>

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MPEG-4 and alpha transparency - the ongoing saga
6 décembre 2022, par OrangeDogI'd like to reach some sort of definitive answer for the following questions :



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- Is alpha transparency supported in MPEG-4-based codecs ?
- Is there any way to be reasonably certain that there is no alpha-channel from the output of
ffprobe?







Some links I've found on the subject :



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- https://stackoverflow.com/a/5057631/476716







Also, transparent alpha layers, an optional part of the H.264 specification, are now supported in H.264-based QuickTime movies.





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- http://software.intel.com/en-us/articles/alpha-channel-support-in-the-h264-decoder-in-ipp/







The support for alpha channel in the H.264 decoder is now available in Intel® Integrated Performance Primitives 6.0 version.










The MPEG4 Simple Studio Profile supports auxiliary channels, which could be used for alpha or depth — and presumably even displacement, motion vectors, normals, etc.





However, I've never seen a concrete example, or indeed any details on how you use these announced features.


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Getting 'av_interleaved_write_frame() : Broken pipe' error
2 juillet 2016, par PoornanI am trying this blog post.I am new to python, numpy as well as FFMPEG. I could not figure out what causes this issue.
http://zulko.github.io/blog/2013/09/27/read-and-write-video-frames-in-python-using-ffmpeg/
here is the code :
import subprocess as sp
import numpy
print ("Hello World!");
FFMPEG_BIN = "ffmpeg" # on Linux ans Mac OS
#FFMPEG_BIN = "ffmpeg.exe" # on Windows
command = [ FFMPEG_BIN,
'-i', '/Users/eananthaneshan/Movies/myvideo.mp4',
'-f', 'image2pipe',
'-pix_fmt', 'yuv444p',
'-s', '420x360',
'-r', '24',
'-vcodec', 'h264', '-']
pipe = sp.Popen(command, stdout = sp.PIPE, bufsize=-1)
# read 420*360*3 bytes (= 1 frame)
raw_image = pipe.stdout.read(420*360*3)
# transform the byte read into a numpy array
image = numpy.fromstring(raw_image, dtype='uint8')
image = image.reshape((360,420,3) )
# throw away the data in the pipe's buffer.
pipe.stdout.flush()This is the output :
ffmpeg version 2.8 Copyright (c) 2000-2015 the FFmpeg developers
built with Apple LLVM version 7.0.0 (clang-700.0.72)
configuration: --prefix=/usr/local/Cellar/ffmpeg/2.8 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-opencl --enable-libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid --enable-libfreetype --enable-libtheora --enable-libvorbis --enable-libvpx --enable-librtmp --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libass --enable-ffplay --enable-libspeex --enable-libschroedinger --enable-libfdk-aac --enable-libopus --enable-frei0r --enable-libopenjpeg --disable-decoder=jpeg2000 --extra-cflags='-I/usr/local/Cellar/openjpeg/1.5.2_1/include/openjpeg-1.5 ' --enable-nonfree --enable-vda
libavutil 54. 31.100 / 54. 31.100
libavcodec 56. 60.100 / 56. 60.100
libavformat 56. 40.101 / 56. 40.101
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 40.101 / 5. 40.101
libavresample 2. 1. 0 / 2. 1. 0
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 2.101 / 1. 2.101
libpostproc 53. 3.100 / 53. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/eananthaneshan/Movies/myvideo.mp4':
Metadata:
major_brand : isom
minor_version : 1
compatible_brands: isom
creation_time : 2014-04-07 02:02:31
Duration: 01:00:10.03, start: 0.000000, bitrate: 1024 kb/s
Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 111 kb/s (default)
Metadata:
creation_time : 2014-04-07 02:02:31
handler_name : GPAC ISO Audio Handler
Stream #0:1(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709/unknown/unknown), 720x404, 909 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
Metadata:
creation_time : 2014-04-07 01:14:58
handler_name : L-SMASH Video Media Handler
encoder : AVC Coding
Output #0, image2pipe, to 'pipe:':
Metadata:
major_brand : isom
minor_version : 1
compatible_brands: isom
encoder : Lavf56.40.101
Stream #0:0(und): Video: rawvideo (444P / 0x50343434), yuv444p, 420x360, q=2-31, 200 kb/s, 23.98 fps, 23.98 tbn, 23.98 tbc (default)
Metadata:
creation_time : 2014-04-07 01:14:58
handler_name : L-SMASH Video Media Handler
encoder : Lavc56.60.100 rawvideo
Stream mapping:
Stream #0:1 -> #0:0 (h264 (native) -> rawvideo (native))
Press [q] to stop, [?] for help
av_interleaved_write_frame(): Broken pipe
frame= 2 fps=0.0 q=-0.0 Lsize= 886kB time=00:00:00.08 bitrate=87003.8kbits/s
video:886kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%
Conversion failed!
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