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Autres articles (78)
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Demande de création d’un canal
12 mars 2010, parEn fonction de la configuration de la plateforme, l’utilisateur peu avoir à sa disposition deux méthodes différentes de demande de création de canal. La première est au moment de son inscription, la seconde, après son inscription en remplissant un formulaire de demande.
Les deux manières demandent les mêmes choses fonctionnent à peu près de la même manière, le futur utilisateur doit remplir une série de champ de formulaire permettant tout d’abord aux administrateurs d’avoir des informations quant à (...) -
Gestion de la ferme
2 mars 2010, parLa ferme est gérée dans son ensemble par des "super admins".
Certains réglages peuvent être fais afin de réguler les besoins des différents canaux.
Dans un premier temps il utilise le plugin "Gestion de mutualisation" -
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 (...)
Sur d’autres sites (15582)
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FFmpeg's -bt (Bitrate Tolerance) options...?
7 décembre 2012, par RRNI want to encode video for Tablets and Mobile Phones by FFmpeg, is it important to set the '-bt' option ?? If I just skip this option, does this affect the video playback on the devices ??
‘-bt tolerance’ Set video bitrate tolerance (in bits, default 4000k).
Has a minimum value of : (target_bitrate/target_framerate). In 1-pass
mode, bitrate tolerance specifies how far ratecontrol is willing to
deviate from the target average bitrate value. This is not related to
min/max bitrate. Lowering tolerance too much has an adverse effect on
quality.Thanks !!
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FFmpeg's "Bitrate Tolerance" and "MPEG Version" Options
10 mars 2012, par RRNI am using FFCoder.
In "Rate Control" -> "Bitrate Tolerance" is set to '1.0'
What does it mean ?
I checked the FFmpeg docs, it explains this is "in bits", default=4000k, so 1.0 seems not reasonable here... anybody know ?
‘-bt tolerance’
Set video bitrate tolerance (in bits, default 4000k). Has a minimum value of : (target_bitrate/target_framerate). In 1-pass mode, bitrate tolerance specifies how far ratecontrol is willing to deviate from the target average bitrate value. This is not related to min/max bitrate. Lowering tolerance too much has an adverse effect on quality.By the way, for "AAC" audio codec, the "MPEG Version" can be set to "MPEG-4" or "MPEG-2", what is the corresponding FFmpeg's option ??
Thanks !!
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Problems video playing in some android devices (version 4+) but not in others
5 juin 2014, par anquegifollowing the settings for video in android developers, http://developer.android.com/guide/appendix/media-formats.html I encoded a video using ffmpeg like this :
ffmpeg -i gravityTrailer.mp4 -y -f mp4 -vcodec libx264 -profile:v baseline -acodec aac -strict -2 -profile:a aac_low -b:v 500k -ar 44100 -b:a 128k -ac 2 -r 30 -s 480x360 output_hq.mp4
which corresponds on sd highquality in table 2 from android developers (link above).
Then i put this video in a server and use the class android.media.MediaPlayer to reproduce it from that URL like this
https://cloudapp.somedomain.com/bmftvideos/output_hq.mp4
The problem is that the video is played on android version 4+
you can see the video on :
LG G2,
Sony xperia Syou cannot see the video on :
Samsung galaxy S4,
BQ (spanish) aquaris 4.5And I don not know why
this is the ffmpeg output :
ffmpeg version 1.2.6 Copyright (c) 2000-2014 the FFmpeg developers
built on Mar 5 2014 08:21:01 with gcc 4.8.2 (GCC) 20131212 (Red Hat 4.8.2-7)
configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-frei0r --enable-gnutls --enable-libass --enable-libcelt --enable-libdc1394 --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopencv --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvpx --enable-libx264 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
libavutil 52. 18.100 / 52. 18.100
libavcodec 54. 92.100 / 54. 92.100
libavformat 54. 63.104 / 54. 63.104
libavdevice 54. 3.103 / 54. 3.103
libavfilter 3. 42.103 / 3. 42.103
libswscale 2. 2.100 / 2. 2.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 2.100 / 52. 2.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x14e5ba0] stream 0, timescale not set
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x14e5ba0] max_analyze_duration 5000000 reached at 5013333 microseconds
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'gravityTrailer.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42isomavc1
creation_time : 2013-12-01 03:59:56
genre : Trailer
artist : Warner Bros.
title : Gravity - 2K Trailer
encoder : HandBrake 0.9.9 2013051800
date : 2013
Duration: 00:02:27.07, start: 0.000000, bitrate: 20296 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 2048x858, 20149 kb/s, 23.98 fps, 23.98 tbr, 90k tbn, 47.95 tbc
Metadata:
creation_time : 2013-12-01 03:59:56
Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 153 kb/s
Metadata:
creation_time : 2013-12-01 03:59:56
Stream #0:2: Video: mjpeg, yuvj420p, 102x150 [SAR 72:72 DAR 17:25], 90k tbr, 90k tbn, 90k tbc
[libx264 @ 0x1667680] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0x1667680] profile Constrained Baseline, level 3.0
[libx264 @ 0x1667680] 264 - core 130 r2282 1db4621 - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=0 ref=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 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=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'output_hq.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42isomavc1
date : 2013
genre : Trailer
artist : Warner Bros.
title : Gravity - 2K Trailer
encoder : Lavf54.63.104
Stream #0:0(und): Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 480x360, q=-1--1, 500 kb/s, 15360 tbn, 30 tbc
Metadata:
creation_time : 2013-12-01 03:59:56
Stream #0:1(eng): Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, stereo, fltp, 128 kb/s
Metadata:
creation_time : 2013-12-01 03:59:56
Stream mapping:
Stream #0:0 -> #0:0 (h264 -> libx264)
Stream #0:1 -> #0:1 (aac -> aac)
Press [q] to stop, [?] for help
frame= 4410 fps= 65 q=-1.0 Lsize= 11154kB time=00:02:27.07 bitrate= 621.3kbits/s dup=885 drop=0
video:9062kB audio:1969kB subtitle:0 global headers:0kB muxing overhead 1.115392%
[libx264 @ 0x1667680] frame I:186 Avg QP:28.41 size: 4446
[libx264 @ 0x1667680] frame P:4224 Avg QP:29.20 size: 2001
[libx264 @ 0x1667680] mb I I16..4: 75.5% 0.0% 24.5%
[libx264 @ 0x1667680] mb P I16..4: 7.5% 0.0% 3.6% P16..4: 23.1% 6.2% 1.8% 0.0% 0.0% skip:57.7%
[libx264 @ 0x1667680] final ratefactor: 27.96
[libx264 @ 0x1667680] coded y,uvDC,uvAC intra: 24.0% 31.9% 8.6% inter: 7.4% 7.6% 0.6%
[libx264 @ 0x1667680] i16 v,h,dc,p: 58% 15% 13% 14%
[libx264 @ 0x1667680] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 9% 27% 7% 6% 8% 5% 7% 3%
[libx264 @ 0x1667680] i8c dc,h,v,p: 80% 7% 12% 2%
[libx264 @ 0x1667680] ref P L0: 84.7% 9.4% 5.9%
[libx264 @ 0x1667680] kb/s:504.98