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Autres articles (34)
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(Dés)Activation de fonctionnalités (plugins)
18 février 2011, parPour gérer l’ajout et la suppression de fonctionnalités supplémentaires (ou plugins), MediaSPIP utilise à partir de la version 0.2 SVP.
SVP permet l’activation facile de plugins depuis l’espace de configuration de MediaSPIP.
Pour y accéder, il suffit de se rendre dans l’espace de configuration puis de se rendre sur la page "Gestion des plugins".
MediaSPIP est fourni par défaut avec l’ensemble des plugins dits "compatibles", ils ont été testés et intégrés afin de fonctionner parfaitement avec chaque (...) -
Le plugin : Podcasts.
14 juillet 2010, parLe problème du podcasting est à nouveau un problème révélateur de la normalisation des transports de données sur Internet.
Deux formats intéressants existent : Celui développé par Apple, très axé sur l’utilisation d’iTunes dont la SPEC est ici ; Le format "Media RSS Module" qui est plus "libre" notamment soutenu par Yahoo et le logiciel Miro ;
Types de fichiers supportés dans les flux
Le format d’Apple n’autorise que les formats suivants dans ses flux : .mp3 audio/mpeg .m4a audio/x-m4a .mp4 (...) -
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 (...)
Sur d’autres sites (7761)
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doc/filters : fix copy&paste error in volume_justin documentation
8 décembre 2012, par Stefano Sabatinidoc/filters : fix copy&paste error in volume_justin documentation
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doc/filters : move volumedetect documentation below volume
8 décembre 2012, par Stefano Sabatinidoc/filters : move volumedetect documentation below volume
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ffmpeg mp4 to mpeg and back again
5 décembre 2012, par bruxI am concatenating mp4 files, from research I have found out you must first encode to mpeg and contatenate those, then convert the larger mpeg file back to mp4.
For simplicity I am just attempting to convert a.mp4 to mpeg and then back to mp4 (i dont need to worry about the concatenation for now)
Here is how I first convert to my intermediary mpeg from mp4 :
ffmpeg -i a.mp4 -q:v 2 -vcodec mpeg2video -acodec copy b.mpgThe file is encoded with no errors, to convert back to mp4 I do :
ffmpeg -i b.mpg -vcodec libx264 -acodec copy out.mp4Everything seems to work with no errors but out.mp4 just plays the first few frames and then freezes, and the time is skipping randomly as the duration passes for the file. No sound is heard also.
*****************************************
Here is the output of the first command
*****************************************
$ ffmpeg -i a.mp4 -q:v 2 -vcodec mpeg2video -acodec copy b.mpg
ffmpeg version 0.9, Copyright (c) 2000-2011 the FFmpeg developers
built on Jun 12 2012 20:43:50 with gcc 4.4.3
configuration: --enable-cross-compile --arch=arm --cpu=cortex-a8 --target-os=linux --enable-runtime-cpudetect --prefix=/data/data/org.witness.sscvideoproto --enable-pic --disable-shared --enable-static --cross-prefix=/home/n8fr8/dev/android/ndk/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin/arm-linux-androideabi- --sysroot=/home/n8fr8/dev/android/ndk/platforms/android-3/arch-arm --enable-version3 --enable-gpl --enable-small --enable-memalign-hack --disable-yasm --disable-doc --enable-decoder=mjpeg --enable-decoder=rawvideo --enable-encoder=libx264 --enable-muxer=mp4 --enable-demuxer=image2 --enable-demuxer=mjpeg --enable-demuxer=mp4 --enable-demuxer=mov --enable-parser=mjpeg --enable-filter=buffer --enable-filter=buffersink --enable-filter=drawbox --enable-filter=overlay --enable-filter=redact --enable-protocol=file --enable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --disable-network --enable-libx264 --enable-zlib --extra-cflags=-I../x264 --extra-ldflags=-L../x264 --disabl libavutil 51. 32. 0 / 51. 32. 0
libavcodec 53. 42. 0 / 53. 42. 0
libavformat 53. 24. 0 / 53. 24. 0
libavfilter 2. 53. 0 / 2. 53. 0
libswscale 2. 1. 0 / 2. 1. 0
libpostproc 51. 2. 0 / 51. 2. 0
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xb05a90] multiple edit list entries, a/v desync might occur, patch welcome
Seems stream 1 codec frame rate differs from container frame rate: 180000.00 (180000/1) -> 43.08 (517/12)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'j.mp4':
Metadata:
major_brand : isom
minor_version : 0
compatible_brands: isom3gp4
creation_time : 1946-12-04 21:52:33
Duration: 00:00:05.31, start: 0.000000, bitrate: 1584 kb/s
Stream #0:0(eng): Audio: aac (mp4a / 0x6134706D), 16000 Hz, mono, s16, 96 kb/s
Metadata:
creation_time : 1946-12-04 21:52:33
handler_name : SoundHandle
Stream #0:1(eng): Video: h264 (avc1 / 0x31637661), yuv420p, 720x480, 1599 kb/s, SAR 65536:65536 DAR 3:2, 13.97 fps, 43.08 tbr, 90k tbn, 180k tbc
Metadata:
creation_time : 1946-12-04 21:52:33
handler_name : VideoHandle
[buffer @ 0xb247f0] w:720 h:480 pixfmt:yuv420p tb:1/1000000 sar:65536/65536 sws_param:
[mpeg @ 0xb23d10] VBV buffer size not set, muxing may fail
Output #0, mpeg, to 'out.mpg':
Metadata:
major_brand : isom
minor_version : 0
compatible_brands: isom3gp4
creation_time : 1946-12-04 21:52:33
encoder : Lavf53.24.0
Stream #0:0(eng): Video: mpeg2video, yuv420p, 720x480 [SAR 65536:65536 DAR 3:2], q=2-31, 200 kb/s, 90k tbn, 50 tbc
Metadata:
creation_time : 1946-12-04 21:52:33
handler_name : VideoHandle
Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 16000 Hz, mono, 96 kb/s
Metadata:
creation_time : 1946-12-04 21:52:33
handler_name : SoundHandle
Stream mapping:
Stream #0:1 -> #0:0 (h264 -> mpeg2video)
Stream #0:0 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 20 fps= 0 q=0.0 size= 14kB time=00:00:00.38 bitrate= 301.8kbits/s dup=15 frame= 34 fps= 28 q=0.0 size= 132kB time=00:00:00.66 bitrate=1638.4kbits/s dup=25 frame= 45 fps= 25 q=0.0 size= 230kB time=00:00:00.88 bitrate=2141.1kbits/s dup=33 frame= 55 fps= 22 q=0.0 size= 294kB time=00:00:01.08 bitrate=2230.0kbits/s dup=40 frame= 66 fps= 21 q=0.0 size= 306kB time=00:00:01.21 bitrate=2061.5kbits/s dup=48 frame= 79 fps= 21 q=0.0 size= 436kB time=00:00:01.56 bitrate=2289.6kbits/s dup=57 frame= 88 fps= 20 q=0.0 size= 514kB time=00:00:01.74 bitrate=2419.9kbits/s dup=63 frame= 100 fps= 21 q=0.0 size= 584kB time=00:00:01.98 bitrate=2416.2kbits/s dup=71 frame= 110 fps= 20 q=0.0 size= 618kB time=00:00:02.17 bitrate=2326.6kbits/s dup=78 frame= 116 fps= 19 q=0.0 size= 650kB time=00:00:02.24 bitrate=2377.1kbits/s dup=82 frame= 132 fps= 20 q=0.0 size= 830kB time=00:00:02.62 bitrate=2595.2kbits/s dup=94 frame= 144 fps= 20 q=0.0 size= 904kB time=00:00:02.86 bitrate=2589.4kbits/s dup=103frame= 156 fps= 20 q=0.0 size= 970kB time=00:00:03.10 bitrate=2563.3kbits/s dup=112frame= 168 fps= 20 q=0.0 size= 1006kB time=00:00:03.20 bitrate=2575.4kbits/s dup=121frame= 179 fps= 20 q=0.0 size= 1138kB time=00:00:03.56 bitrate=2618.7kbits/s dup=129frame= 191 fps= 20 q=0.0 size= 1240kB time=00:00:03.80 bitrate=2673.2kbits/s dup=138frame= 203 fps= 20 q=0.0 size= 1342kB time=00:00:04.04 bitrate=2721.2kbits/s dup=147frame= 215 fps= 20 q=0.0 size= 1426kB time=00:00:04.22 bitrate=2765.6kbits/s dup=156frame= 227 fps= 20 q=0.0 size= 1536kB time=00:00:04.52 bitrate=2783.8kbits/s dup=165frame= 239 fps= 20 q=0.0 size= 1646kB time=00:00:04.76 bitrate=2832.8kbits/s dup=174frame= 248 fps= 20 q=0.0 size= 1726kB time=00:00:04.94 bitrate=2862.2kbits/s dup=181frame= 248 fps= 19 q=0.0 Lsize= 1738kB time=00:00:04.94 bitrate=2882.1kbits/s dup=181 drop=0
video:1665kB audio:62kB global headers:0kB muxing overhead 0.639219%
*****************************************
Here is the output of the second command
*****************************************
$ ffmpeg -i out.mpg -vcodec libx264 -acodec copy out1.mp4
ffmpeg version 0.9, Copyright (c) 2000-2011 the FFmpeg developers
built on Jun 12 2012 20:43:50 with gcc 4.4.3
configuration: --enable-cross-compile --arch=arm --cpu=cortex-a8 --target-os=linux --enable-runtime-cpudetect --prefix=/data/data/org.witness.sscvideoproto --enable-pic --disable-shared --enable-static --cross-prefix=/home/n8fr8/dev/android/ndk/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin/arm-linux-androideabi- --sysroot=/home/n8fr8/dev/android/ndk/platforms/android-3/arch-arm --enable-version3 --enable-gpl --enable-small --enable-memalign-hack --disable-yasm --disable-doc --enable-decoder=mjpeg --enable-decoder=rawvideo --enable-encoder=libx264 --enable-muxer=mp4 --enable-demuxer=image2 --enable-demuxer=mjpeg --enable-demuxer=mp4 --enable-demuxer=mov --enable-parser=mjpeg --enable-filter=buffer --enable-filter=buffersink --enable-filter=drawbox --enable-filter=overlay --enable-filter=redact --enable-protocol=file --enable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --disable-network --enable-libx264 --enable-zlib --extra-cflags=-I../x264 --extra-ldflags=-L../x264 --disabl libavutil 51. 32. 0 / 51. 32. 0
libavcodec 53. 42. 0 / 53. 42. 0
libavformat 53. 24. 0 / 53. 24. 0
libavfilter 2. 53. 0 / 2. 53. 0
libswscale 2. 1. 0 / 2. 1. 0
libpostproc 51. 2. 0 / 51. 2. 0
[mp1 @ 0xb0d420] Header missing
Last message repeated 8 times
[mpeg @ 0xb05a90] Could not find codec parameters (Audio: mp3, 0 channels, s16)
Input #0, mpeg, from 'out.mpg':
Duration: 00:00:05.24, start: 1.000000, bitrate: 2712 kb/s
Stream #0:0[0x1e0]: Video: mpeg2video, yuv420p, 720x480 [SAR 1:1 DAR 3:2], 104857 kb/s, 50 fps, 50 tbr, 90k tbn, 100 tbc
Stream #0:1[0x1c0]: Audio: mp3, 0 channels, s16
[buffer @ 0xb77ca0] w:720 h:480 pixfmt:yuv420p tb:1/1000000 sar:1/1 sws_param:
[libx264 @ 0xb0c6e0] using SAR=1/1
[libx264 @ 0xb0c6e0] using cpu capabilities: ARMv6 NEON
[libx264 @ 0xb0c6e0] profile High, level 3.1
[libx264 @ 0xb0c6e0] 264 - core 119 r2113 cc129ad - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - 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=1 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
Output #0, mp4, to 'out1.mp4':
Metadata:
encoder : Lavf53.24.0
Stream #0:0: Video: h264 (![0][0][0] / 0x0021), yuv420p, 720x480 [SAR 1:1 DAR 3:2], q=-1--1, 50 tbn, 50 tbc
Stream mapping:
Stream #0:0 -> #0:0 (mpeg2video -> libx264)
Press [q] to stop, [?] for help
frame= 248 fps= 3 q=31.0 Lsize= 419kB time=00:00:04.92 bitrate= 697.5kbits/s
video:415kB audio:0kB global headers:0kB muxing overhead 0.863133%
[libx264 @ 0xb0c6e0] frame I:3 Avg QP:16.46 size: 3927
[libx264 @ 0xb0c6e0] frame P:102 Avg QP:22.91 size: 3884
[libx264 @ 0xb0c6e0] frame B:143 Avg QP:27.16 size: 116
[libx264 @ 0xb0c6e0] consecutive B-frames: 18.1% 8.9% 18.1% 54.8%
[libx264 @ 0xb0c6e0] mb I I16..4: 56.3% 42.7% 1.0%
[libx264 @ 0xb0c6e0] mb P I16..4: 6.1% 9.9% 0.6% P16..4: 33.2% 4.9% 2.2% 0.0% 0.0% skip:43.1%
[libx264 @ 0xb0c6e0] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 6.7% 0.0% 0.0% direct: 0.1% skip:93.2% L0:53.5% L1:45.4% BI: 1.2%
[libx264 @ 0xb0c6e0] 8x8 transform intra:57.0% inter:85.5%
[libx264 @ 0xb0c6e0] coded y,uvDC,uvAC intra: 36.0% 71.6% 24.9% inter: 4.4% 11.6% 0.6%
[libx264 @ 0xb0c6e0] i16 v,h,dc,p: 35% 21% 10% 34%
[libx264 @ 0xb0c6e0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 22% 34% 3% 3% 4% 2% 4% 5%
[libx264 @ 0xb0c6e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 19% 11% 4% 12% 12% 7% 5% 6%
[libx264 @ 0xb0c6e0] i8c dc,h,v,p: 49% 22% 22% 7%
[libx264 @ 0xb0c6e0] Weighted P-Frames: Y:2.9% UV:2.0%
[libx264 @ 0xb0c6e0] ref P L0: 79.5% 8.1% 9.8% 2.5% 0.0%
[libx264 @ 0xb0c6e0] ref B L0: 91.9% 7.5% 0.6%
[libx264 @ 0xb0c6e0] ref B L1: 94.8% 5.2%
[libx264 @ 0xb0c6e0] kb/s:684.84
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