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Valkaama DVD Label
4 octobre 2011, par
Mis à jour : Février 2013
Langue : English
Type : Image
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Podcasting Legal guide
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Mis à jour : Mai 2011
Langue : English
Type : Texte
Autres articles (112)
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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 (...) -
ANNEXE : Les plugins utilisés spécifiquement pour la ferme
5 mars 2010, parLe site central/maître de la ferme a besoin d’utiliser plusieurs plugins supplémentaires vis à vis des canaux pour son bon fonctionnement. le plugin Gestion de la mutualisation ; le plugin inscription3 pour gérer les inscriptions et les demandes de création d’instance de mutualisation dès l’inscription des utilisateurs ; le plugin verifier qui fournit une API de vérification des champs (utilisé par inscription3) ; le plugin champs extras v2 nécessité par inscription3 (...)
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Les formats acceptés
28 janvier 2010, parLes commandes suivantes permettent d’avoir des informations sur les formats et codecs gérés par l’installation local de ffmpeg :
ffmpeg -codecs ffmpeg -formats
Les format videos acceptés en entrée
Cette liste est non exhaustive, elle met en exergue les principaux formats utilisés : h264 : H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 m4v : raw MPEG-4 video format flv : Flash Video (FLV) / Sorenson Spark / Sorenson H.263 Theora wmv :
Les formats vidéos de sortie possibles
Dans un premier temps on (...)
Sur d’autres sites (8155)
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How to record desktop while on x2go session via a command line tool ?
4 décembre 2017, par harageithe Goal :
I am trying to record a specific X display on a remote server with a command line tool.the Problem :
The output file contains a pure black video stream for the whole duration of the recording.My Approach :
I am connecting to a remote server via x2go. The Server runs Ubuntu 16.04.2 with Xfce Desktop Environment. The Display I try to record is :50 (which gets created when I connect to the x2go server). I can control the remote server totally fine through x2go.My commands for recording via ffmpeg (or avconv/recordmydesktop, which use ffmpeg underneath) all look more or less the same and are like this :
ffmpeg -f x11grab -r 25 -s 1854x1176 -i :50.0 -c:v libx264 screencast.mkvSample output :
user@machine:~/$ ffmpeg -f x11grab -r 25 -s 1854x1176 -i :50.0+0,0 -c:v libx264 -vb 4000k -an screencast.mkv
ffmpeg version N-86766-g264f6c6 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
configuration: --prefix=/home/user/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/user/ffmpeg_build/include --extra-ldflags=-L/home/user/ffmpeg_build/lib --bindir=/home/user/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree
libavutil 55. 67.100 / 55. 67.100
libavcodec 57.100.104 / 57.100.104
libavformat 57. 75.100 / 57. 75.100
libavdevice 57. 7.100 / 57. 7.100
libavfilter 6. 95.100 / 6. 95.100
libswscale 4. 7.101 / 4. 7.101
libswresample 2. 8.100 / 2. 8.100
libpostproc 54. 6.100 / 54. 6.100
[x11grab @ 0x1fd9b40] XFixes not available, cannot draw the mouse.
[x11grab @ 0x1fd9b40] Stream #0: not enough frames to estimate rate; consider increasing probesize
Input #0, x11grab, from ':50.0+0,0':
Duration: N/A, start: 1500041497.684675, bitrate: N/A
Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1854x1176, 25 fps, 1000k tbr, 1000k tbn, 1000k tbc
File 'screencast.mkv' already exists. Overwrite ? [y/N] y
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0x1fe3040] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0x1fe3040] profile High 4:4:4 Predictive, level 4.2, 4:4:4 8-bit
[libx264 @ 0x1fe3040] 264 - core 148 r2643 5c65704 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=4 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=4000 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, matroska, to 'screencast.mkv':
Metadata:
encoder : Lavf57.75.100
Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv444p, 1854x1176, q=-1--1, 4000 kb/s, 25 fps, 1k tbn, 25 tbc
Metadata:
encoder : Lavc57.100.104 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/4000000 buffer size: 0 vbv_delay: -1
[swscaler @ 0x1fe94e0] Warning: data is not aligned! This can lead to a speedloss
frame= 179 fps= 36 q=-1.0 Lsize= 16kB time=00:00:07.04 bitrate= 18.8kbits/s speed=1.43x
video:14kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 12.869934%
[libx264 @ 0x1fe3040] frame I:1 Avg QP: 6.00 size: 518
[libx264 @ 0x1fe3040] frame P:45 Avg QP: 0.44 size: 81
[libx264 @ 0x1fe3040] frame B:133 Avg QP: 0.94 size: 73
[libx264 @ 0x1fe3040] consecutive B-frames: 0.6% 1.1% 0.0% 98.3%
[libx264 @ 0x1fe3040] mb I I16..4: 0.0% 100.0% 0.0%
[libx264 @ 0x1fe3040] mb P I16..4: 0.0% 0.0% 0.0% P16..4: 0.0% 0.0% 0.0% 0.0% 0.0% skip:100.0%
[libx264 @ 0x1fe3040] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 0.0% 0.0% 0.0% direct: 0.0% skip:100.0%
[libx264 @ 0x1fe3040] final ratefactor: -23.85
[libx264 @ 0x1fe3040] 8x8 transform intra:100.0%
[libx264 @ 0x1fe3040] coded y,u,v intra: 0.0% 0.0% 0.0% inter: 0.0% 0.0% 0.0%
[libx264 @ 0x1fe3040] i16 v,h,dc,p: 0% 0% 100% 0%
[libx264 @ 0x1fe3040] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 0% 0% 100% 0% 0% 0% 0% 0% 0%
[libx264 @ 0x1fe3040] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x1fe3040] kb/s:15.56Using : Ubuntu 16.04.2 LTS
I have successfully accomplished to capture the display :50 with "simplescreenrecorder", but that tool has no command line interface. It uses ffmpeg also, so it somehow should be possible to caputure the display but I can´t get it to work properly.
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ffmpeg throw a silent video output when trying to merge video and audio
31 janvier 2023, par porororoI tried to combine mp4 format video and wav format audio.
The video is shorter than the audio and start second is same as 00:00.


I used command as bellows :


ffmpeg -i video.mp4 -i audio.wav -filter_complex "[0:a]volume=0.2[A];[1:a][A]amerge[Aout]" -map 0:v -map [Aout] -y -shortest output_video.mp4


The problem is the output_video.mp4 is a silent video without the sound.


How can I get the output_video.mp4 with sound from audio.wav ?


ffmpeg output is :




ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 7.3.0 (crosstool-NG 1.23.0.449-a04d0)
configuration: --prefix=/tmp/build/80754af9/ffmpeg_1587154242452/\_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placeho --cc=/tmp/build/80754af9/ffmpeg_1587154242452/\_build_env/bin/x86_64-conda_cos6-linux-gnu-cc --disable-doc --enable-avresample --enable-gmp --enable-hardcoded-tables --enable-libfreetype --enable-libvpx --enable-pthreads --enable-libopus --enable-postproc --enable-pic --enable-pthreads --enable-shared --enable-static --enable-version3 --enable-zlib --enable-libmp3lame --disable-nonfree --enable-gpl --enable-gnutls --disable-openssl --enable-libopenh264 --enable-libx264
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
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.29.100
Duration: 00:00:19.04, start: 0.000000, bitrate: 510 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720, 373 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
Metadata:
handler_name : SoundHandler
Guessed Channel Layout for Input Stream #1.0 : mono
Input #1, wav, from 'audio.wav':
Duration: 00:00:14.70, bitrate: 352 kb/s
Stream #1:0: Audio: pcm_s16le (\[1\]\[0\]\[0\]\[0\] / 0x0001), 22050 Hz, mono, s16, 352 kb/s
Stream mapping:
Stream #0:1 (aac) -\> volume (graph 0)
Stream #1:0 (pcm_s16le) -\> amerge:in0 (graph 0)
Stream #0:0 -\> #0:0 (h264 (native) -\> h264 (libx264))
amerge (graph 0) -\> Stream #0:1 (aac)
Press \[q\] to stop, \[?\] for help
\[libx264 @ 0x55aa9a642ac0\] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 AVX512
\[libx264 @ 0x55aa9a642ac0\] profile High, level 3.1, 4:2:0, 8-bit
\[libx264 @ 0x55aa9a642ac0\] 264 - core 157 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=22 lookahead_threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
\[Parsed_amerge_1 @ 0x55aa9b37c140\] No channel layout for input 1
Output #0, mp4, to 'output_video.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.29.100
Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p(progressive), 1280x720, q=-1--1, 30 fps, 15360 tbn, 30 tbc (default)
Metadata:
handler_name : VideoHandler
encoder : Lavc58.54.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 22050 Hz, 3.0, fltp, 197 kb/s (default)
Metadata:
encoder : Lavc58.54.100 aac
frame= 507 fps=291 q=-1.0 Lsize= 1116kB time=00:00:16.80 bitrate= 544.3kbits/s speed=9.64x 
video:760kB audio:342kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.242977%
\[libx264 @ 0x55aa9a642ac0\] frame I:3 Avg QP:16.24 size: 19770
\[libx264 @ 0x55aa9a642ac0\] frame P:154 Avg QP:20.29 size: 3227
\[libx264 @ 0x55aa9a642ac0\] frame B:350 Avg QP:19.84 size: 633
\[libx264 @ 0x55aa9a642ac0\] consecutive B-frames: 0.6% 15.8% 18.9% 64.7%
\[libx264 @ 0x55aa9a642ac0\] mb I I16..4: 23.5% 67.4% 9.1%
\[libx264 @ 0x55aa9a642ac0\] mb P I16..4: 0.7% 3.0% 0.3% P16..4: 13.0% 3.1% 1.0% 0.0% 0.0% skip:78.8%
\[libx264 @ 0x55aa9a642ac0\] mb B I16..4: 0.2% 0.1% 0.0% B16..8: 10.4% 0.3% 0.0% direct: 0.6% skip:88.3% L0:41.5% L1:57.2% BI: 1.3%
\[libx264 @ 0x55aa9a642ac0\] 8x8 transform intra:68.2% inter:81.9%
\[libx264 @ 0x55aa9a642ac0\] coded y,uvDC,uvAC intra: 24.6% 22.9% 6.1% inter: 1.2% 1.7% 0.0%
\[libx264 @ 0x55aa9a642ac0\] i16 v,h,dc,p: 68% 16% 6% 10%
\[libx264 @ 0x55aa9a642ac0\] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 10% 50% 2% 2% 3% 2% 4% 3%
\[libx264 @ 0x55aa9a642ac0\] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 32% 25% 13% 5% 5% 6% 5% 6% 4%
\[libx264 @ 0x55aa9a642ac0\] i8c dc,h,v,p: 75% 10% 12% 2%
\[libx264 @ 0x55aa9a642ac0\] Weighted P-Frames: Y:0.0% UV:0.0%
\[libx264 @ 0x55aa9a642ac0\] ref P L0: 65.9% 16.2% 13.5% 4.4%
\[libx264 @ 0x55aa9a642ac0\] ref B L0: 84.1% 13.4% 2.5%
\[libx264 @ 0x55aa9a642ac0\] ref B L1: 97.1% 2.9%
\[libx264 @ 0x55aa9a642ac0\] kb/s:368.24
\[aac @ 0x55aa9a62a280\] Qavg: 8290.713





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How can I compress or change the resolution of the video very fast with FFmpeg ?
28 mai 2017, par RaresI would like to compress or change the resolution of the video before sending it to server but I don’t want to take too long. For example for the following code a video with size 100MB it takes 2-3 min to resize it to 10MB. Can I do it faster without losing too much quality ?
String[] command = {"-i", filePath, "-vf", "scale=640:360", "-c:a", "copy", "-preset", "ultrafast", dest.getAbsolutePath()};Console output for above command :
05-28 11:50:22.131 23323-23323/com.example.rares.peoplecounterapp D/TestFFmpeg: SUCCESS with output : ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 4.8 (GCC)
configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
libavutil 55. 17.103 / 55. 17.103
libavcodec 57. 24.102 / 57. 24.102
libavformat 57. 25.100 / 57. 25.100
libavdevice 57. 0.101 / 57. 0.101
libavfilter 6. 31.100 / 6. 31.100
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/DCIM/Camera/20170501_212606.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
creation_time : 2017-05-01 18:26:46
com.android.version: 6.0
Duration: 00:00:38.70, start: 0.000000, bitrate: 17203 kb/s
Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 17007 kb/s, SAR 1:1 DAR 16:9, 29.98 fps, 29.92 tbr, 90k tbn, 180k tbc (default)
Metadata:
creation_time : 2017-05-01 18:26:46
handler_name : VideoHandle
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 155 kb/s (default)
Metadata:
creation_time : 2017-05-01 18:26:46
handler_name : SoundHandle
[libx264 @ 0xf7344400] using SAR=1/1
[libx264 @ 0xf7344400] using cpu capabilities: none!
[libx264 @ 0xf7344400] profile Constrained Baseline, level 3.0
[libx264 @ 0xf7344400] 264 - core 148 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - 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=9 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 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
Output #0, mp4, to '/storage/emulated/0/DCIM/Camera/20170501_212606_compressed97.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
com.android.version: 6.0
encoder : Lavf57.25.100
Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 640x360 [SAR 1:1 DAR 16:9], q=-1--1, 29.92 fps, 11488 tbn, 29.92 tbc (default)
Metadata:
creation_time : 2017-05-01 18:26:46
handler_name : VideoHandle
encoder : Lavc57.24.102 libx264
Side data:
unknown side data type 10 (24 bytes)
Stream #0:1(eng): Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, 155 kb/s (default)
Metadata:
creation_time : 2017-05-01 18:26:46
handler_name : SoundHandle
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 6 fps=0.0 q=0.0 size= 0kB time=00:00:01.04 bitrate= 0.4kbits/s speed=1.96x
frame= 15 fps=
05-28 11:50:22.132 23323-23323/com.example.rares.peoplecounterapp D/TestFFmpeg: Finished command :ffmpeg [Ljava.lang.String;@d8854f
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