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Autres articles (65)
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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 (...) -
Les tâches Cron régulières de la ferme
1er décembre 2010, parLa gestion de la ferme passe par l’exécution à intervalle régulier de plusieurs tâches répétitives dites Cron.
Le super Cron (gestion_mutu_super_cron)
Cette tâche, planifiée chaque minute, a pour simple effet d’appeler le Cron de l’ensemble des instances de la mutualisation régulièrement. Couplée avec un Cron système sur le site central de la mutualisation, cela permet de simplement générer des visites régulières sur les différents sites et éviter que les tâches des sites peu visités soient trop (...) -
MediaSPIP version 0.1 Beta
16 avril 2011, parMediaSPIP 0.1 beta est la première version de MediaSPIP décrétée comme "utilisable".
Le fichier zip ici présent contient uniquement les sources de MediaSPIP en version standalone.
Pour avoir une installation fonctionnelle, 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 (12390)
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Encode x264 video with ffmpeg for Android with starting offset
4 août 2013, par scubedI'm trying to convert a video to play on an Android device.
The video is from a big movie. I am chopping it back into pieces
to correspond with the actual segments of the movie using -ss and -t.The input is mp4 with H.264 and AAC.
The output is mkv using H.264 and Vorbis.Specifically, the input is :
Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 320x240, 2240 kb/s, 29.97 fps, 60 tbr, 90k tbn, 180k tbc
Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, s16, 162 kb/sI'm using : ffmpeg version 1.0.7
The command I'm trying is something like :
ffmpeg -ss 00:03:52.000 -i in.mp4 -t 00:01:00.000 -c:v libx264 -preset medium -crf 20 -maxrate 400k -bufsize 1835k -c:a libvorbis -sn out.mkvHowever, while the resulting video works fine on my computer, when I click on
my phone, it says : Can't play video
and checking the Android log, it has :E/SoftAVC (24319): Decoder failed: -2
E/OMXCodec(24319): [OMX.google.h264.decoder] ERROR(0x80001001, -1007)It is still able to make a thumbnail for the movie, but not play it.
Interestingly, some simple variations of that command do work :
Remove -ss to start at the beginning of the video
Use -an to disable audioThese variations still failed :
Copying the original audio with -c:a copy, or other audio codecs like vorbis, mp3
Using mp4 instead of mkv
Using baseline H.264 profile, including restricting level to 1.2.Running through mkvmerge first not only fails, but makes Android not able to even make a thumbnail.
I don't know if it is related, but another small thing I noticed is that for
starting transcoding later in the movie, the audio starts out slightly out-of-sync.
After several seconds, it gets back in sync. The audio is in sync in the original.Robert Rowntree :
-vcodec libx264 -b:v 200k -bt 50k -threads 0 -b_strategy 1 -acodec copy -f mp4 -strict -2Interesting. Your command almost works. The video actually plays on Android. The one problem is that the audio is out-of-sync and stays out-of-sync throughout the whole clip. But, that's much closer than I've been. I'll search around there and see if I can find the right combination.
I tried combinations of it. It appears that using both mp4 and copying the audio is what allows it to work. Using libvorbis or going to mkv breaks it again. But, I would like to transcode the audio, and I suspect to keep it in sync, I might have to transcode it anyways. Note that even with transcoding, when I play it back on the computer, I still don't have sync between audio and video.
LordNeckbeard :
Here is the complete log.ffmpeg version 1.0.7 Copyright (c) 2000-2013 the FFmpeg developers
built on Jul 27 2013 13:01:19 with gcc 4.4.5 (Gentoo 4.4.5 p1.2, pie-0.4.5)
configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --enable-shared --cc=x86_64-pc-linux-gnu-gcc --cxx=x86_64-pc-linux-gnu-g++ --ar=x86_64-pc-linux-gnu-ar --optflags='-mtune=athlon64 -O2 -pipe -fomit-frame-pointer -fstack-protector' --extra-cflags='-mtune=athlon64 -O2 -pipe -fomit-frame-pointer -fstack-protector' --extra-cxxflags='-mtune=athlon64 -O2 -pipe -fomit-frame-pointer -fstack-protector' --disable-static --enable-gpl --enable-version3 --enable-postproc --enable-avfilter --enable-avresample --disable-stripping --disable-debug --disable-doc --disable-vaapi --disable-runtime-cpudetect --enable-libmp3lame --enable-libvo-aacenc --enable-libtheora --enable-libx264 --enable-libxvid --enable-libcaca --enable-openal --disable-indev=v4l2 --disable-indev=oss --disable-indev=jack --enable-x11grab --disable-outdev=oss --enable-libfreetype --enable-pthreads --enable-libspeex --enable-libvorbis --disable-altivec --disable-avx --disable-vis --disable-neon --cpu=athlon64 - libavutil 51. 73.101 / 51. 73.101
libavcodec 54. 59.100 / 54. 59.100
libavformat 54. 29.104 / 54. 29.104
libavdevice 54. 2.101 / 54. 2.101
libavfilter 3. 17.100 / 3. 17.100
libswscale 2. 1.101 / 2. 1.101
libswresample 0. 15.100 / 0. 15.100
libpostproc 52. 0.100 / 52. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'in.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42isomavc1
creation_time : 2013-07-13 02:23:51
encoder : HandBrake 0.9.6 2012022800
Duration: 03:14:01.41, start: 0.000000, bitrate: 2408 kb/s
Chapter #0.0: start -0.133467, end 648.697411
Metadata:
title : Chapter 1
Chapter #0.1: start 648.697411, end 1297.345411
Metadata:
title : Chapter 2
Chapter #0.2: start 1297.345411, end 1729.777411
Metadata:
title : Chapter 3
Chapter #0.3: start 1729.777411, end 2378.425411
Metadata:
title : Chapter 4
Chapter #0.4: start 2378.425411, end 3027.073411
Metadata:
title : Chapter 5
Chapter #0.5: start 3027.073411, end 3675.721411
Metadata:
title : Chapter 6
Chapter #0.6: start 3675.721411, end 4108.153411
Metadata:
title : Chapter 7
Chapter #0.7: start 4108.153411, end 4756.801411
Metadata:
title : Chapter 8
Chapter #0.8: start 4756.801411, end 5405.449411
Metadata:
title : Chapter 9
Chapter #0.9: start 5405.449411, end 6054.097411
Metadata:
title : Chapter 10
Chapter #0.10: start 6054.097411, end 6702.745411
Metadata:
title : Chapter 11
Chapter #0.11: start 6702.745411, end 7135.177411
Metadata:
title : Chapter 12
Chapter #0.12: start 7135.177411, end 7783.825411
Metadata:
title : Chapter 13
Chapter #0.13: start 7783.825411, end 8432.473411
Metadata:
title : Chapter 14
Chapter #0.14: start 8432.473411, end 9081.121411
Metadata:
title : Chapter 15
Chapter #0.15: start 9081.121411, end 9513.553411
Metadata:
title : Chapter 16
Chapter #0.16: start 9513.553411, end 10162.201411
Metadata:
title : Chapter 17
Chapter #0.17: start 10162.201411, end 10810.849411
Metadata:
title : Chapter 18
Chapter #0.18: start 10810.849411, end 11459.497411
Metadata:
title : Chapter 19
Chapter #0.19: start 11459.497411, end 11641.412478
Metadata:
title : Chapter 20
Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 320x240, 2240 kb/s, 29.97 fps, 60 tbr, 90k tbn, 180k tbc
Metadata:
creation_time : 2013-07-13 02:23:51
Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, s16, 162 kb/s
Metadata:
creation_time : 2013-07-13 02:23:51
Stream #0:2(und): Subtitle: mov_text (text / 0x74786574)
Metadata:
creation_time : 2013-07-13 02:23:51
[libx264 @ 0x14ea220] using cpu capabilities: MMX2 SSE2Slow SlowCTZ
[libx264 @ 0x14ea220] profile High, level 2.1
[libx264 @ 0x14ea220] 264 - core 120 - 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=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=60 keyint_min=6 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=20.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=400 vbv_bufsize=1835 crf_max=0.0 nal_hrd=none ip_ratio=1.40 aq=1:1.00
Output #0, matroska, to 'out.mkv':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42isomavc1
encoder : Lavf54.29.104
Chapter #0.0: start 0.000000, end 60.000000
Metadata:
title : Chapter 1
Stream #0:0(und): Video: h264 (H264 / 0x34363248), yuv420p, 320x240, q=-1--1, 1k tbn, 60 tbc
Metadata:
creation_time : 2013-07-13 02:23:51
Stream #0:1(und): Audio: vorbis (oV[0][0] / 0x566F), 48000 Hz, stereo, flt
Metadata:
creation_time : 2013-07-13 02:23:51
Stream mapping:
Stream #0:0 -> #0:0 (h264 -> libx264)
Stream #0:1 -> #0:1 (aac -> libvorbis)
Press [q] to stop, [?] for help
frame= 1799 fps= 92 q=-1.0 Lsize= 3738kB time=00:00:59.98 bitrate= 510.5kbits/s dup=0 drop=51 =51
video:3016kB audio:683kB subtitle:0 global headers:4kB muxing overhead 0.939943%
[libx264 @ 0x14ea220] frame I:31 Avg QP:20.23 size: 14126
[libx264 @ 0x14ea220] frame P:634 Avg QP:23.03 size: 3317
[libx264 @ 0x14ea220] frame B:1134 Avg QP:27.71 size: 482
[libx264 @ 0x14ea220] consecutive B-frames: 2.3% 12.8% 84.7% 0.2%
[libx264 @ 0x14ea220] mb I I16..4: 3.8% 63.8% 32.4%
[libx264 @ 0x14ea220] mb P I16..4: 0.1% 0.3% 0.1% P16..4: 47.4% 30.2% 19.5% 0.0% 0.0% skip: 2.4%
[libx264 @ 0x14ea220] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 35.2% 3.0% 0.6% direct: 8.8% skip:52.3% L0:28.7% L1:63.9% BI: 7.4%
[libx264 @ 0x14ea220] 8x8 transform intra:64.0% inter:59.5%
[libx264 @ 0x14ea220] coded y,uvDC,uvAC intra: 94.2% 99.5% 95.5% inter: 23.3% 55.5% 14.0%
[libx264 @ 0x14ea220] i16 v,h,dc,p: 75% 10% 5% 10%
[libx264 @ 0x14ea220] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 16% 12% 8% 7% 8% 8% 11% 11%
[libx264 @ 0x14ea220] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 20% 7% 8% 9% 9% 10% 10% 11%
[libx264 @ 0x14ea220] i8c dc,h,v,p: 38% 31% 14% 17%
[libx264 @ 0x14ea220] Weighted P-Frames: Y:7.3% UV:4.4%
[libx264 @ 0x14ea220] ref P L0: 48.8% 14.2% 29.1% 7.5% 0.4%
[libx264 @ 0x14ea220] ref B L0: 65.4% 30.8% 3.7%
[libx264 @ 0x14ea220] ref B L1: 89.0% 11.0%
[libx264 @ 0x14ea220] kb/s:411.70 -
How can i have a good frame quality with PHP5-FFMPEG ?
13 mars 2012, par YeppaoI'm trying tu use PHP5-FFMPEG in my website, but when i try to take some frame of any movie, the quality of this frame is really poor...
Here's the simply way i use to write this frames into images.
$frame = $mov->getFrame($_GET['frame']);
$img = $frame->toGDImage();
header("Content-type: image/jpeg");
imagejpeg($img);Can i have a better quality with this extension ? Or I have to invoke a ffmpeg command line ?
Image link :
http://i.stack.imgur.com/OKXUj.jpg -
Playing With File
8 septembre 2011, par Multimedia Mike — GeneralI played with the ‘file’ utility a long time ago because I wanted to make it recognize a large number of multimedia formats. I had trouble getting my changes to take. But I’m prepared to try again after many years.
Aiming at the Corpus
In my local mirror of the MPlayerHQ samples archive, I find 9853 unique files. So I run all of them through the ‘file’ command :’find /path/to/samples -type f -print0 | xargs -0 file —no-pad’
My Ubuntu installation has file v5.04. I also tested against 5.07 and the latest, 5.08. Here is the number of files each version was unable to identify (generically marking as ‘data’) :
5.04 1521 5.07 1405 5.08 1501
That seems like a regression for v5.08 until I dug into the details and saw quite a few items like this, indicating that the MPEG detection could use some work :
mov/mov-demux-infinite-loop.mpg : DOS-executable (
+mov/mg-‹demux-infinite-loop.mpg : data
image-samples/UNeedQT4.pntg : DOS-executable (
+imY- samples/UNeedQT4.pntg : data
Workflow
These are just notes to myself and perhaps anyone else who wants to add new file formats to be identified by the ‘file’ command.First, download either the latest release from the FTP or clone from Github. Do the usual unpack, ‘./configure’, ‘make’ routine. To use this newly-built version and its associated magic file :
./src/file —magic-file magic/magic.mgc <file>
To add a new format for ID, first, run the foregoing command to ensure that it’s not already identified. Then, check over the files in magic/Magdir and see which one might pertain to what you’re doing (it’s unlikely that your format will merit a new file in this directory). For example, for this round, I modified animation, audio, iff, and riff. Add or modify existing specs based on the copious examples in the directory and by consulting the appropriate man page (‘man 5 magic’).
Finally, run ‘make’ again which will regenerate the magic file. Invoke the above command again to use the modified magic file.
Before and After
On a selection of formats taken from the samples archive (renamed and cut down to a kilobyte because detection typically only relies on the first few bytes), here is the “before” :amv : RIFF (little-endian) data armovie : data bbc-dirac : data interplay-mve : data mtv : data nintendo-thp : data nullsoft-video : data redcode : data sega-film : data smacker : data trueaudio : data vqa : IFF data wavpack : data wc3-mve : IFF data wtv : data
And the “after” :
amv : RIFF (little-endian) data, AMV armovie : ARMovie bbc-dirac : BBC Dirac Video interplay-mve : Interplay MVE Movie mtv : MTV Multimedia File nintendo-thp : Nintendo THP Multimedia nullsoft-video : Nullsoft Video redcode : REDCode Video sega-film : Sega FILM/CPK Multimedia, 320 x 224 smacker : RAD Game Tools Smacker Multimedia version 2, 320 x 200, 100 frames trueaudio : True Audio Lossless Audio vqa : IFF data, Westwood Studios VQA Multimedia, 418 video frames, 320 x 200 wavpack : WavPack Lossless Audio wc3-mve : IFF data, Wing Commander III Video, PC version wtv : Windows Television DVR Media
After rerunning ‘file’ on the mphq corpus using the modified magic file, only 1329 files remain unidentified (down from 1501).
Going Forward
As mentioned, MPEG detection could probably be strengthened. However, a major weakness is QuickTime/MP4. Many files are not detected, probably owing to the many ways that QuickTime files can begin.
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