Recherche avancée
Médias (91)
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DJ Z-trip - Victory Lap : The Obama Mix Pt. 2
15 septembre 2011
Mis à jour : Avril 2013
Langue : English
Type : Audio
-
Matmos - Action at a Distance
15 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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DJ Dolores - Oslodum 2004 (includes (cc) sample of “Oslodum” by Gilberto Gil)
15 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Danger Mouse & Jemini - What U Sittin’ On ? (starring Cee Lo and Tha Alkaholiks)
15 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Cornelius - Wataridori 2
15 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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The Rapture - Sister Saviour (Blackstrobe Remix)
15 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
Autres articles (80)
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Le profil des utilisateurs
12 avril 2011, parChaque utilisateur dispose d’une page de profil lui permettant de modifier ses informations personnelle. Dans le menu de haut de page par défaut, un élément de menu est automatiquement créé à l’initialisation de MediaSPIP, visible uniquement si le visiteur est identifié sur le site.
L’utilisateur a accès à la modification de profil depuis sa page auteur, un lien dans la navigation "Modifier votre profil" est (...) -
Configurer la prise en compte des langues
15 novembre 2010, parAccéder à la configuration et ajouter des langues prises en compte
Afin de configurer la prise en compte de nouvelles langues, il est nécessaire de se rendre dans la partie "Administrer" du site.
De là, dans le menu de navigation, vous pouvez accéder à une partie "Gestion des langues" permettant d’activer la prise en compte de nouvelles langues.
Chaque nouvelle langue ajoutée reste désactivable tant qu’aucun objet n’est créé dans cette langue. Dans ce cas, elle devient grisée dans la configuration et (...) -
Publier sur MédiaSpip
13 juin 2013Puis-je poster des contenus à partir d’une tablette Ipad ?
Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir
Sur d’autres sites (11573)
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x86 : replace explicit REP_RETs with RETs
1er février 2023, par Lynnex86 : replace explicit REP_RETs with RETs
From x86inc :
> On AMD cpus <=K10, an ordinary ret is slow if it immediately follows either
> a branch or a branch target. So switch to a 2-byte form of ret in that case.
> We can automatically detect "follows a branch", but not a branch target.
> (SSSE3 is a sufficient condition to know that your cpu doesn't have this problem.)x86inc can automatically determine whether to use REP_RET rather than
REP in most of these cases, so impact is minimal. Additionally, a few
REP_RETs were used unnecessary, despite the return being nowhere near a
branch.The only CPUs affected were AMD K10s, made between 2007 and 2011, 16
years ago and 12 years ago, respectively.In the future, everyone involved with x86inc should consider dropping
REP_RETs altogether.- [DH] libavcodec/x86/aacpsdsp.asm
- [DH] libavcodec/x86/ac3dsp.asm
- [DH] libavcodec/x86/alacdsp.asm
- [DH] libavcodec/x86/audiodsp.asm
- [DH] libavcodec/x86/dirac_dwt.asm
- [DH] libavcodec/x86/fft.asm
- [DH] libavcodec/x86/flacdsp.asm
- [DH] libavcodec/x86/h264_chromamc.asm
- [DH] libavcodec/x86/h264_chromamc_10bit.asm
- [DH] libavcodec/x86/h264_deblock_10bit.asm
- [DH] libavcodec/x86/h264_idct.asm
- [DH] libavcodec/x86/h264_idct_10bit.asm
- [DH] libavcodec/x86/h264_intrapred.asm
- [DH] libavcodec/x86/h264_intrapred_10bit.asm
- [DH] libavcodec/x86/h264_qpel_10bit.asm
- [DH] libavcodec/x86/h264_qpel_8bit.asm
- [DH] libavcodec/x86/h264_weight.asm
- [DH] libavcodec/x86/h264_weight_10bit.asm
- [DH] libavcodec/x86/hevc_sao.asm
- [DH] libavcodec/x86/hevc_sao_10bit.asm
- [DH] libavcodec/x86/hpeldsp.asm
- [DH] libavcodec/x86/hpeldsp_vp3.asm
- [DH] libavcodec/x86/huffyuvdsp.asm
- [DH] libavcodec/x86/jpeg2000dsp.asm
- [DH] libavcodec/x86/lossless_videodsp.asm
- [DH] libavcodec/x86/lossless_videoencdsp.asm
- [DH] libavcodec/x86/me_cmp.asm
- [DH] libavcodec/x86/pngdsp.asm
- [DH] libavcodec/x86/qpel.asm
- [DH] libavcodec/x86/qpeldsp.asm
- [DH] libavcodec/x86/rv34dsp.asm
- [DH] libavcodec/x86/rv40dsp.asm
- [DH] libavcodec/x86/sbrdsp.asm
- [DH] libavcodec/x86/takdsp.asm
- [DH] libavcodec/x86/utvideodsp.asm
- [DH] libavcodec/x86/v210.asm
- [DH] libavcodec/x86/vc1dsp_mc.asm
- [DH] libavcodec/x86/videodsp.asm
- [DH] libavcodec/x86/vp8dsp.asm
- [DH] libavfilter/x86/af_volume.asm
- [DH] libavfilter/x86/avf_showcqt.asm
- [DH] libavfilter/x86/scene_sad.asm
- [DH] libavfilter/x86/vf_blend.asm
- [DH] libavfilter/x86/vf_framerate.asm
- [DH] libavfilter/x86/vf_gradfun.asm
- [DH] libavfilter/x86/vf_hqdn3d.asm
- [DH] libavfilter/x86/vf_interlace.asm
- [DH] libavfilter/x86/vf_maskedmerge.asm
- [DH] libavfilter/x86/vf_stereo3d.asm
- [DH] libavfilter/x86/vf_w3fdif.asm
- [DH] libavutil/x86/float_dsp.asm
- [DH] libavutil/x86/lls.asm
- [DH] libswresample/x86/audio_convert.asm
- [DH] libswresample/x86/rematrix.asm
- [DH] libswscale/x86/input.asm
- [DH] libswscale/x86/output.asm
- [DH] libswscale/x86/scale.asm
- [DH] libswscale/x86/scale_avx2.asm
- [DH] libswscale/x86/yuv2yuvX.asm
- [DH] libswscale/x86/yuv_2_rgb.asm
- [DH] tests/checkasm/x86/checkasm.asm
-
Do I need multiple video files in different resolutions to use MPEG DASH ?
2 février 2023, par Gentil AlysonI'm trying to use Django REST Framework to serve .mpd files. When the user uploads a video, the server creates the MPD and the chunk files. However, I can't seem to able to make it work. I've tried using python-ffmpeg-video-streaming, but the client which is using dash.js to play the video will get only one bitrate (480p). I've also tried running this command
'ffmpeg -i {self.file.path} -map 0 -map 0 -c:a aac -c:v libx264 -b:v:0 800k -b:v:1 300k -var_stream_map "v:0,name:800k v:1,name:300k" -f dash -dash_segment_type mp4 -single_file 1 {file_dir}/dash.mpd'usingos.systemfrom Python, but then the player gets stuck at buffering.



<mpd xmlns="urn:mpeg:dash:schema:mpd:2011" profiles="urn:mpeg:dash:profile:isoff-live:2011" type="static" mediapresentationduration="PT2M30.5S" maxsegmentduration="PT5.0S" minbuffertime="PT16.6S">
 <programinformation>
 </programinformation>
 <servicedescription>
 </servicedescription>
 <period start="PT0.0S">
 <adaptationset contenttype="video" startwithsap="1" segmentalignment="true" bitstreamswitching="true" framerate="30000/1001" maxwidth="1280" maxheight="720" par="16:9" lang="und">
 <representation mimetype="video/mp4" codecs="avc1.64001f" bandwidth="800000" width="1280" height="720" sar="1:1">
 <baseurl>dash-stream0.mp4</baseurl>
 <segmentlist timescale="1000000" duration="5000000" startnumber="1">
 <initialization range="0-854"></initialization>
 <segmenturl mediarange="855-190364" indexrange="855-906"></segmenturl>
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 <segmenturl mediarange="4905001-5046627" indexrange="4905001-4905052"></segmenturl>
 </segmentlist>
 </representation>
 </adaptationset>
 <adaptationset contenttype="audio" startwithsap="1" segmentalignment="true" bitstreamswitching="true" lang="eng">
 <representation mimetype="audio/mp4" codecs="mp4a.40.2" bandwidth="128000" audiosamplingrate="44100">
 <audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"></audiochannelconfiguration>
 <baseurl>dash-stream1.mp4</baseurl>
 <segmentlist timescale="1000000" duration="5000000" startnumber="1">
 <initialization range="0-764"></initialization>
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 <representation mimetype="video/mp4" codecs="avc1.64001f" bandwidth="300000" width="1280" height="720" sar="1:1">
 <baseurl>dash-stream2.mp4</baseurl>
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 </adaptationset>
 <adaptationset contenttype="audio" startwithsap="1" segmentalignment="true" bitstreamswitching="true" lang="eng">
 <representation mimetype="audio/mp4" codecs="mp4a.40.2" bandwidth="128000" audiosamplingrate="44100">
 <audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"></audiochannelconfiguration>
 <baseurl>dash-stream3.mp4</baseurl>
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 <segmenturl mediarange="2443752-2446358" indexrange="2443752-2443803"></segmenturl>
 </segmentlist>
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</mpd>




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 <programinformation>
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 <servicedescription>
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 <period start="PT0.0S">
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 <segmenttemplate timescale="44100" initialization="dash_init_$RepresentationID$.m4s" media="dash_chunk_$RepresentationID$_$Number%05d$.m4s" startnumber="1">
 <segmenttimeline>
 <s t="0" d="220160"></s>
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 </segmenttimeline>
 </segmenttemplate>
 </representation>
 </adaptationset>
 <adaptationset contenttype="video" startwithsap="1" segmentalignment="true" bitstreamswitching="true" framerate="30/1" maxwidth="1920" maxheight="1080" par="16:9" lang="und">
 <representation mimetype="video/mp4" codecs="avc1.640028" bandwidth="4096000" width="1920" height="1080" sar="1:1">
 <segmenttemplate timescale="15360" initialization="dash_init_$RepresentationID$.m4s" media="dash_chunk_$RepresentationID$_$Number%05d$.m4s" startnumber="1">
 <segmenttimeline>
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 </segmenttemplate>
 </representation>
 </adaptationset>
 <adaptationset contenttype="audio" startwithsap="1" segmentalignment="true" bitstreamswitching="true" lang="eng">
 <representation mimetype="audio/mp4" codecs="mp4a.40.2" bandwidth="320000" audiosamplingrate="44100">
 <audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"></audiochannelconfiguration>
 <segmenttemplate timescale="44100" initialization="dash_init_$RepresentationID$.m4s" media="dash_chunk_$RepresentationID$_$Number%05d$.m4s" startnumber="1">
 <segmenttimeline>
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</mpd>


Do I really need multiple video files in different resolutions ? If not, then how would I go about making the necessary files ? Thanks in advance !


-
Converting RGB to YUV, + ffmpeg
10 juillet 2012, par TheSHEEEPI am trying the following to record a live video from my Flash/AIR application :
- I take a "screenshot" (BitmapData from stage) each frame.
-
I convert each pixel to yuv format like this (V2) :
var file :File = new File(_appUrl + "/creation/output.raw");
var fs :FileStream = new FileStream();
fs.open(file, FileMode.WRITE);
var finalY :ByteArray = new ByteArray();
var finalU :ByteArray = new ByteArray();
var finalV :ByteArray = new ByteArray();
var rect :Rectangle = new Rectangle(0, 0, 600, 700);
var pixels :ByteArray;
var pixel :uint;
var r :uint;
var g :uint;
var b :uint;
_screenBuffer = _screenBuffer.reverse();
while (_screenBuffer.length > 0)
{
pixels = BitmapData(_screenBuffer.pop()).getPixels(rect);
pixels.position = 0;
// Convert and save each pixel
for (var x:int = 0; x < 600; x++)
{
for (var y:int = 0; y < 700; y++)
{
// Convert to yuv
pixel = pixels.readUnsignedInt();
r = pixel >> 16 & 0xff;
g = pixel >> 8 & 0xff;
b = pixel & 0xff;
// Y' is written for each pixel
finalY.writeByte(0.257 * r + 0.504 * g + 0.098 * b + 128);
// U and V are written once per 2x2 pixel block
if (x % 2 == 0 && y % 2 == 0)
{
finalU.writeByte(-0.148 * r - 0.291 * g + 0.439 * b + 128);
finalV.writeByte(0.439 * r - 0.368 * g - 0.071 * b + 128);
}
}
}
}
// Write the converted bytes to the file
finalY.position = 0;
finalU.position = 0;
finalV.position = 0;
fs.writeBytes(finalY, 0, finalY.length);
fs.writeBytes(finalU, 0, finalU.length);
fs.writeBytes(finalV, 0, finalV.length);
fs.close(); -
I use the following line of ffmpeg to convert the raw file to a video :
ffmpeg -r 30 -pix_fmt yuv420p -s 600x700 -vcodec rawvideo -f rawvideo -i output.raw -y test.mp4
A video is created, but it is simply a mess, barely resembling what was recorded. I know that the capturing process works, as I have tried the same BitmapData "screenshots" with the SimpleFlvWriter.
So, either something is wrong with my conversion or with the ffmpeg line, but I have no idea.
This is what ffmpeg outputs when creating the video, maybe it can help someone :
libavutil 51. 39.100 / 51. 39.100
libavcodec 54. 3.101 / 54. 3.101
libavformat 54. 1.100 / 54. 1.100
libavdevice 53. 4.100 / 53. 4.100
libavfilter 2. 62.101 / 2. 62.101
libswscale 2. 1.100 / 2. 1.100
libswresample 0. 7.100 / 0. 7.100
libpostproc 52. 0.100 / 52. 0.100
[rawvideo @ 01D39FC0] Estimating duration from bitrate, this may be inaccurate
Input #0, rawvideo, from 'output.raw':
Duration: N/A, start: 0.000000, bitrate: N/A
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 600x700, 30 tbr,
30 tbn, 30 tbc
[buffer @ 01D3FEC0] w:600 h:700 pixfmt:yuv420p tb:1/1000000 sar:0/1 sws_param:
[libx264 @ 0375DB80] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE 4.2 AVX
[libx264 @ 0375DB80] profile High, level 3.1
[libx264 @ 0375DB80] 264 - core 120 r2146 bcd41db - 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=12 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=0rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'test.mp4':
Metadata:
encoder : Lavf54.1.100
Stream #0:0: Video: h264 (![0][0][0] / 0x0021), yuv420p, 600x700, q=-1--1, 30 tbn, 30 tbc
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo -> libx264)
Press [q] to stop, [?] for help
Truncating packet of size 630000 to 1
frame= 48 fps= 0 q=-1.0 Lsize= 157kB time=00:00:01.53 bitrate= 837.3kbits/s
video:156kB audio:0kB global headers:0kB muxing overhead 0.687626%
[libx264 @ 0375DB80] frame I:3 Avg QP:23.15 size: 23480
[libx264 @ 0375DB80] frame P:38 Avg QP:28.80 size: 2169
[libx264 @ 0375DB80] frame B:7 Avg QP:29.61 size: 833
[libx264 @ 0375DB80] consecutive B-frames: 79.2% 4.2% 0.0% 16.7%
[libx264 @ 0375DB80] mb I I16..4: 41.4% 6.2% 52.4%
[libx264 @ 0375DB80] mb P I16..4: 10.6% 3.3% 0.9% P16..4: 68.4% 1.3% 1.2% 0.0% 0.0% skip:14.2%
[libx264 @ 0375DB80] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 13.3% 2.2% 0.7% direct: 1.9% skip:81.9% L0:51.6% L1:47.4% BI: 1.0%
[libx264 @ 0375DB80] 8x8 transform intra:16.7% inter:31.2%
[libx264 @ 0375DB80] coded y,uvDC,uvAC intra: 14.7% 25.5% 22.3% inter: 1.0% 4.1% 3.4%
[libx264 @ 0375DB80] i16 v,h,dc,p: 87% 11% 2% 0%
[libx264 @ 0375DB80] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 3% 18% 75% 1% 0% 1% 1% 0% 0%
[libx264 @ 0375DB80] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 6% 74% 12% 1% 1% 1% 2% 1% 2%
[libx264 @ 0375DB80] i8c dc,h,v,p: 51% 45% 4% 1%
[libx264 @ 0375DB80] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0375DB80] ref P L0: 4.6% 0.4% 94.6% 0.3%
[libx264 @ 0375DB80] ref B L0: 96.0% 4.0%
[libx264 @ 0375DB80] ref B L1: 96.5% 3.5%
[libx264 @ 0375DB80] kb/s:793.39I'm not really a codec expert (just starting ;)), so I don't know what to make of most of that.
Here is a zip that contains one of the frames and the video output. What should be visible is a green smiling pear, without any artifacts. Remember the size is 600x700 and the format yuv420. Best to view such raw image files with irfanview, IMO. Don't mind the noise, its from pushing against my microphone ;)
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