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Carte de Schillerkiez
13 mai 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Texte
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Personnaliser les catégories
21 juin 2013, parFormulaire de création d’une catégorie
Pour ceux qui connaissent bien SPIP, une catégorie peut être assimilée à une rubrique.
Dans le cas d’un document de type catégorie, les champs proposés par défaut sont : Texte
On peut modifier ce formulaire dans la partie :
Administration > Configuration des masques de formulaire.
Dans le cas d’un document de type média, les champs non affichés par défaut sont : Descriptif rapide
Par ailleurs, c’est dans cette partie configuration qu’on peut indiquer le (...) -
Script d’installation automatique de MediaSPIP
25 avril 2011, parAfin de palier aux difficultés d’installation dues principalement aux dépendances logicielles coté serveur, un script d’installation "tout en un" en bash a été créé afin de faciliter cette étape sur un serveur doté d’une distribution Linux compatible.
Vous devez bénéficier d’un accès SSH à votre serveur et d’un compte "root" afin de l’utiliser, ce qui permettra d’installer les dépendances. Contactez votre hébergeur si vous ne disposez pas de cela.
La documentation de l’utilisation du script d’installation (...) -
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 (...)
Sur d’autres sites (6646)
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Save a stream of arrays to video using FFMPEG
13 décembre 2022, par Gianluca IacchiniI made a simple fluid simulation using CUDA, and I'm trying to save it to a video using FFMPEG, however I get the
Finishing stream 0:0 without any data written to it
warning.

This is how i send the data


unsigned char* data = new unsigned char[SCR_WIDTH * SCR_HEIGHT * 4];
uchar4* pColors = new uchar4[SCR_WIDTH * SCR_HEIGHT];

for (int i = 0; i < N_FRAMES; i ++)
{
 // Computes a simulation step and sets pColors with the correct values.
 on_frame(pColors, timeStepSize);
 for (int j = 0; j < SCR_WIDTH * SCR_HEIGHT * 4; j+=4)
 {
 data[j] = pColors[j].x;
 data[j+1] = pColors[j].y;
 data[j+2] = pColors[j].z;
 data[j+3] = pColors[j].w;
 }
 std::cout.write(reinterpret_cast(data), SCR_WIDTH * SCR_HEIGHT * 4);
}



And then I pass it to FFMPEG using the following command :


./simulation.o | ffmpeg -y -f rawvideo -pixel_format rgba -video_size 1024x1024 -i - -c:v libx264 -pix_fmt yuv444p -crf 0 video.mp4

`

This works fine if I hard code the values (es. if I set
data[j] = 255
I get a red screen as expected) but when I use thepColors
variable I get the following message from FFMPEG

Finishing stream 0:0 without any data written to it.


Even though both
pColors
anddata
hold the correct values.

Here is the full report from FFMPEG


ffmpeg started on 2022-12-13 at 14:28:34
Report written to "ffmpeg-20221213-142834.log"
Command line:
ffmpeg -y -f rawvideo -report -pixel_format rgba -video_size 128x128 -i - -c:v libx264 -pix_fmt yuv444p -crf 0 video9.mp4
ffmpeg version 3.4.11-0ubuntu0.1 Copyright (c) 2000-2022 the FFmpeg developers
 built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
 configuration: --prefix=/usr --extra-version=0ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chrom libavutil 55. 78.100 / 55. 78.100
 libavcodec 57.107.100 / 57.107.100
 libavformat 57. 83.100 / 57. 83.100
 libavdevice 57. 10.100 / 57. 10.100
 libavfilter 6.107.100 / 6.107.100
 libavresample 3. 7. 0 / 3. 7. 0
 libswscale 4. 8.100 / 4. 8.100
 libswresample 2. 9.100 / 2. 9.100
 libpostproc 54. 7.100 / 54. 7.100
Splitting the commandline.
Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
Reading option '-f' ... matched as option 'f' (force format) with argument 'rawvideo'.
Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
Reading option '-pixel_format' ... matched as AVOption 'pixel_format' with argument 'rgba'.
Reading option '-video_size' ... matched as AVOption 'video_size' with argument '128x128'.
Reading option '-i' ... matched as input url with argument '-'.
Reading option '-c:v' ... matched as option 'c' (codec name) with argument 'libx264'.
Reading option '-pix_fmt' ... matched as option 'pix_fmt' (set pixel format) with argument 'yuv444p'.
Reading option '-crf' ... matched as AVOption 'crf' with argument '0'.
Reading option 'video9.mp4' ... matched as output url.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option y (overwrite output files) with argument 1.
Applying option report (generate a report) with argument 1.
Successfully parsed a group of options.
Parsing a group of options: input url -.
Applying option f (force format) with argument rawvideo.
Successfully parsed a group of options.
Opening an input file: -.
[rawvideo @ 0x558eba7b0000] Opening 'pipe:' for reading
[pipe @ 0x558eba78a080] Setting default whitelist 'crypto'
[rawvideo @ 0x558eba7b0000] Before avformat_find_stream_info() pos: 0 bytes read:0 seeks:0 nb_streams:1
[rawvideo @ 0x558eba7b0000] After avformat_find_stream_info() pos: 0 bytes read:0 seeks:0 frames:0
Input #0, rawvideo, from 'pipe:':
 Duration: N/A, bitrate: 13107 kb/s
 Stream #0:0, 0, 1/25: Video: rawvideo (RGBA / 0x41424752), rgba, 128x128, 13107 kb/s, 25 tbr, 25 tbn, 25 tbc
Successfully opened the file.
Parsing a group of options: output url video9.mp4.
Applying option c:v (codec name) with argument libx264.
Applying option pix_fmt (set pixel format) with argument yuv444p.
Successfully parsed a group of options.
Opening an output file: video9.mp4.
[file @ 0x558eba78a200] Setting default whitelist 'file,crypto'
Successfully opened the file.
Stream mapping:
 Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
No more output streams to write to, finishing.
Finishing stream 0:0 without any data written to it.
detected 2 logical cores
[graph 0 input from stream 0:0 @ 0x558eba7a4a00] Setting 'video_size' to value '128x128'
[graph 0 input from stream 0:0 @ 0x558eba7a4a00] Setting 'pix_fmt' to value '28'
[graph 0 input from stream 0:0 @ 0x558eba7a4a00] Setting 'time_base' to value '1/25'
[graph 0 input from stream 0:0 @ 0x558eba7a4a00] Setting 'pixel_aspect' to value '0/1'
[graph 0 input from stream 0:0 @ 0x558eba7a4a00] Setting 'sws_param' to value 'flags=2'
[graph 0 input from stream 0:0 @ 0x558eba7a4a00] Setting 'frame_rate' to value '25/1'
[graph 0 input from stream 0:0 @ 0x558eba7a4a00] w:128 h:128 pixfmt:rgba tb:1/25 fr:25/1 sar:0/1 sws_param:flags=2
[format @ 0x558eba7a4b40] compat: called with args=[yuv444p]
[format @ 0x558eba7a4b40] Setting 'pix_fmts' to value 'yuv444p'
[auto_scaler_0 @ 0x558eba7a4be0] Setting 'flags' to value 'bicubic'
[auto_scaler_0 @ 0x558eba7a4be0] w:iw h:ih flags:'bicubic' interl:0
[format @ 0x558eba7a4b40] auto-inserting filter 'auto_scaler_0' between the filter 'Parsed_null_0' and the filter 'format'
[AVFilterGraph @ 0x558eba76d500] query_formats: 4 queried, 2 merged, 1 already done, 0 delayed
[auto_scaler_0 @ 0x558eba7a4be0] w:128 h:128 fmt:rgba sar:0/1 -> w:128 h:128 fmt:yuv444p sar:0/1 flags:0x4
[libx264 @ 0x558eba7cf900] using mv_range_thread = 24
[libx264 @ 0x558eba7cf900] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 AVX512
[libx264 @ 0x558eba7cf900] profile High 4:4:4 Predictive, level 1.1, 4:4:4 8-bit
[libx264 @ 0x558eba7cf900] 264 - core 152 r2854 e9a5903 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=0 mixed_ref=1 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=0 chroma_qp_offset=0 threads=3 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc=cqp mbtree=0 qp=0
Output #0, mp4, to 'video9.mp4':
 Metadata:
 encoder : Lavf57.83.100
 Stream #0:0, 0, 1/12800: Video: h264 (libx264) (avc1 / 0x31637661), yuv444p, 128x128, q=-1--1, 25 fps, 12800 tbn, 25 tbc
 Metadata:
 encoder : Lavc57.107.100 libx264
 Side data:
 cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
frame= 0 fps=0.0 q=0.0 Lsize= 0kB time=00:00:00.00 bitrate=N/A speed= 0x 
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Input file #0 (pipe:):
 Input stream #0:0 (video): 0 packets read (0 bytes); 0 frames decoded; 
 Total: 0 packets (0 bytes) demuxed
Output file #0 (video9.mp4):
 Output stream #0:0 (video): 0 frames encoded; 0 packets muxed (0 bytes); 
 Total: 0 packets (0 bytes) muxed
0 frames successfully decoded, 0 decoding errors
[AVIOContext @ 0x558eba7b4120] Statistics: 2 seeks, 3 writeouts
[AVIOContext @ 0x558eba7b4000] Statistics: 0 bytes read, 0 seeks




I've never used FFMPEG before so I'm having a hard time finding my mistake.


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ffmpeg : ffplay reading audio live stream from azure media services but no sound
30 novembre 2022, par SOAL ABDELDJALLILI also would say that playing audio file with the same command works fine, but with live streams it's kind of random.


this is the output :


ffplay "https://xxxxxx.streaming.media.azure.net/d7b0faf2-9922-4ee6-a9fb-4a1cc33d1dab/output.ism/manifest(format=mpd-time-cmaf)" -nodisp

ffplay version 4.1.9-0+deb10u1+rpt1 Copyright (c) 2003-2022 the FFmpeg developers
 built with gcc 8 (Raspbian 8.3.0-6+rpi1)
 configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl - -disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable -libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig - -enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-li bopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnap py --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enabl e-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable- lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enable-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enabl e-libx264 --enable-shared --libdir=/usr/lib/arm-linux-gnueabihf --cpu=arm1176jzf-s --arch=arm
 WARNING: library configuration mismatch
 avutil configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf -- enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-lib aom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-lib fontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --en able-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo rbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzv bi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enab le-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-fr ei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disab le-doc --disable-programs
 avcodec configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf -- enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-lib aom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-lib fontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --en able-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo rbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzv bi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enab le-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-fr ei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disab le-doc --disable-programs
 avformat configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf -- enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-lib aom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-lib fontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --en able-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo rbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzv bi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enab le-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-fr ei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disab le-doc --disable-programs
 avdevice configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf -- enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-lib aom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-lib fontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --en able-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo rbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzv bi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enab le-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-fr ei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disab le-doc --disable-programs
 avfilter configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf -- enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-lib aom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-lib fontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --en able-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo rbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzv bi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enab le-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-fr ei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disab le-doc --disable-programs
 avresample configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf -- enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-lib aom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-lib fontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --en able-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo rbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzv bi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enab le-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-fr ei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disab le-doc --disable-programs
 swscale configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf -- enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-lib aom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-lib fontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --en able-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo rbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzv bi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enab le-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-fr ei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disab le-doc --disable-programs
 swresample configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf -- enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-lib aom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-lib fontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --en able-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo rbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzv bi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enab le-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-fr ei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disab le-doc --disable-programs
 postproc configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf -- enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-lib aom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-lib fontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --en able-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo rbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzv bi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enab le-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-fr ei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disab le-doc --disable-programs
 libavutil 56. 22.100 / 56. 22.100
 libavcodec 58. 35.100 / 58. 35.100
 libavformat 58. 20.100 / 58. 20.100
 libavdevice 58. 5.100 / 58. 5.100
 libavfilter 7. 40.101 / 7. 40.101
 libavresample 4. 0. 0 / 4. 0. 0
 libswscale 5. 3.100 / 5. 3.100
 libswresample 3. 3.100 / 3. 3.100
 libpostproc 55. 3.100 / 55. 3.100
Input #0, dash, from 'https://xxxxxxxxxxx.streaming.media.azure.net/d7b0faf2-9922-4ee6-a9fb-4a1cc33d1dab/output.ism/manifes t(format=mpd-time-cmaf)':
 Duration: N/A, start: 204.023000, bitrate: 1 kb/s
 Program 0
 Stream #0:0: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 1 kb/s
 Metadata:
 variant_bitrate : 125000
 id : 5_A_audio_2945019330H▒?
^Z24.07 M-A: -0.000 fd= 0 aq= 0KB vq= 0KB sq= 0B f=0/0



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FFMPEG blending screen two libvpx-vp9 webm yuva420p video files comes out looking incorrect
30 novembre 2022, par OneWorldI'm trying to screen blend two libvpx-vp9 webm files, so that the blend comes out looking correct in FFMPEG. The example below takes two rgba png input files, loops them for a couple of seconds into libvpx-vp9 webm files with the pixel format yuva420p. It then tries to blend them using FFMPEG. I then output frames of these to visualise how it looks here in this Stack Overflow post.


I have these two input rgba pngs (circle and Pikachu)




I create two libvpx-vp9 webm files from them like this :-


ffmpeg -loop 1 -i circle_50_rgba.png -c:v libvpx-vp9 -t 2 -pix_fmt yuva420p circle_libvpx-vp9_yuva420p.webm

ffmpeg -loop 1 -i pikachu_rgba.png -c:v libvpx-vp9 -t 2 -pix_fmt yuva420p pikachu_libvpx-vp9_yuva420p.webm



I then try and do a blend of these two libvpx-vp9 webm files like this :-


ffmpeg -y -c:v libvpx-vp9 -i circle_libvpx-vp9_yuva420p.webm -c:v libvpx-vp9 -i pikachu_libvpx-vp9_yuva420p.webm -filter_complex "[1:v][0:v]blend=all_mode=screen" pikachu_reverse_all_mode_screened_onto_circle_both_yuva420p.webm



and extract a frame from that like this


ffmpeg -c:v libvpx-vp9 -i pikachu_reverse_all_mode_screened_onto_circle_both_yuva420p.webm -frames:v 1 pikachu_reverse_all_mode_screened_onto_circle_from_yuva420p.png





If I do this without all_mode, like this


ffmpeg -y -c:v libvpx-vp9 -i circle_libvpx-vp9_yuva420p.webm -c:v libvpx-vp9 -i pikachu_libvpx-vp9_yuva420p.webm -filter_complex "[1:v][0:v]blend=screen" pikachu_reverse_screened_onto_circle_both_yuva420p.webm



and then extract the png so we can visualise it, like this :-


ffmpeg -c:v libvpx-vp9 -i pikachu_reverse_screened_onto_circle_both_yuva420p.webm -frames:v 1 pikachu_reverse_screened_onto_circle_from_yuva420p.png





which is also incorrect because the white part of the circle should be completely white in the screen blend. We shouldn't see a faint yellow outline of Pikachu inside the white part.


It should look like this :-



Here is the full log of this is like this :-


ffmpeg -y -c:v libvpx-vp9 -i circle_libvpx-vp9_yuva420p.webm -c:v libvpx-vp9 -i pikachu_libvpx-vp9_yuva420p.webm -filter_complex "[1:v][0:v]blend=screen" pikachu_reverse_screened_onto_circle_both_yuva420p.webm
ffmpeg version 4.2.7-0ubuntu0.1 Copyright (c) 2000-2022 the FFmpeg developers
 built with gcc 9 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
 configuration: --prefix=/usr --extra-version=0ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
 libavutil 56. 31.100 / 56. 31.100
 libavcodec 58. 54.100 / 58. 54.100
 libavformat 58. 29.100 / 58. 29.100
 libavdevice 58. 8.100 / 58. 8.100
 libavfilter 7. 57.100 / 7. 57.100
 libavresample 4. 0. 0 / 4. 0. 0
 libswscale 5. 5.100 / 5. 5.100
 libswresample 3. 5.100 / 3. 5.100
 libpostproc 55. 5.100 / 55. 5.100
[libvpx-vp9 @ 0x55d5b1f34680] v1.8.2
 Last message repeated 1 times
Input #0, matroska,webm, from 'circle_libvpx-vp9_yuva420p.webm':
 Metadata:
 ENCODER : Lavf58.29.100
 Duration: 00:00:02.00, start: 0.000000, bitrate: 19 kb/s
 Stream #0:0: Video: vp9 (Profile 0), yuva420p(tv), 50x50, SAR 1:1 DAR 1:1, 25 fps, 25 tbr, 1k tbn, 1k tbc (default)
 Metadata:
 alpha_mode : 1
 ENCODER : Lavc58.54.100 libvpx-vp9
 DURATION : 00:00:02.000000000
[libvpx-vp9 @ 0x55d5b1f854c0] v1.8.2
 Last message repeated 1 times
Input #1, matroska,webm, from 'pikachu_libvpx-vp9_yuva420p.webm':
 Metadata:
 ENCODER : Lavf58.29.100
 Duration: 00:00:02.00, start: 0.000000, bitrate: 29 kb/s
 Stream #1:0: Video: vp9 (Profile 0), yuva420p(tv), 50x50, SAR 1:1 DAR 1:1, 25 fps, 25 tbr, 1k tbn, 1k tbc (default)
 Metadata:
 alpha_mode : 1
 ENCODER : Lavc58.54.100 libvpx-vp9
 DURATION : 00:00:02.000000000
[libvpx-vp9 @ 0x55d5b1f38940] v1.8.2
[libvpx-vp9 @ 0x55d5b1f49440] v1.8.2
Stream mapping:
 Stream #0:0 (libvpx-vp9) -> blend:bottom
 Stream #1:0 (libvpx-vp9) -> blend:top
 blend -> Stream #0:0 (libvpx-vp9)
Press [q] to stop, [?] for help
[libvpx-vp9 @ 0x55d5b1f49440] v1.8.2
[libvpx-vp9 @ 0x55d5b1f38940] v1.8.2
[libvpx-vp9 @ 0x55d5b1f80c40] v1.8.2
Output #0, webm, to 'pikachu_reverse_screened_onto_circle_both_yuva420p.webm':
 Metadata:
 encoder : Lavf58.29.100
 Stream #0:0: Video: vp9 (libvpx-vp9), yuva420p, 50x50 [SAR 1:1 DAR 1:1], q=-1--1, 200 kb/s, 25 fps, 1k tbn, 25 tbc (default)
 Metadata:
 encoder : Lavc58.54.100 libvpx-vp9
 Side data:
 cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
frame= 50 fps=0.0 q=0.0 Lsize= 7kB time=00:00:01.96 bitrate= 29.3kbits/s speed=33.2x 
video:4kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 96.711426%




I also tried doing a convertion to rgba, like this :-


ffmpeg -y -c:v libvpx-vp9 -i circle_libvpx-vp9_yuva420p.webm -c:v libvpx-vp9 -i pikachu_libvpx-vp9_yuva420p.webm -filter_complex "[0:v]format=pix_fmts=rgba[zero];[1:v]format=pix_fmts=rgba[one];[one][zero]blend=screen" pikachu_reverse_screened_all_mode_onto_circle_after_rgba_conversion_webm.webm



However the result of this also comes out with yellow inside the white circle, which should be white


I was wondering what I need to do so that the blend of these two webm libvpx-vp9 video files looks correct, like it does above.


note : I need to retain the alpha channels, because sometimes assets have transparent alpha channels. In the examples above the assets happen to have opaque alpha channels.