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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
16 mai 2011, par
Mis à jour : Mai 2011
Langue : English
Type : Texte
Autres articles (55)
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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 (...) -
XMP PHP
13 mai 2011, parDixit Wikipedia, XMP signifie :
Extensible Metadata Platform ou XMP est un format de métadonnées basé sur XML utilisé dans les applications PDF, de photographie et de graphisme. Il a été lancé par Adobe Systems en avril 2001 en étant intégré à la version 5.0 d’Adobe Acrobat.
Étant basé sur XML, il gère un ensemble de tags dynamiques pour l’utilisation dans le cadre du Web sémantique.
XMP permet d’enregistrer sous forme d’un document XML des informations relatives à un fichier : titre, auteur, historique (...)
Sur d’autres sites (5382)
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Diamond Rio Artifacts
30 août 2012, par Multimedia Mike — Multimedia HistoryRemember the Diamond Rio PMP300 ? It’s credited with being the very first portable MP3 player, released all the way back in 1998 (I say ‘credited’ because I visited an audio museum once which exhibited a Toshiba MP3 player from 1997). I recently rescued a pristine set of Rio artifacts from a recycle pile.
I wondered if I should scan the manual for posterity. However, a Google search indicates that a proper PDF (loaded with pleas to not illegally copy music) isn’t very difficult to come by. Here are the other items that came with the unit :
Click for larger image
Ah, more memories (of dialup internet) : A tie-in with another Diamond product, this time a modem which claims to enable the user to download songs at up to 112 kilobits per second. I wonder if that was really possible. I remember that 56k modems were a stretch and 33.6k was the best that most users could hope for.
There is also a separate piece of paper that advises the buyer that the parallel port adapter might look a bit different than what is seen in the printed copy. Imagine the age of downloading to your MP3 player via parallel port while pulling down new songs via dialup internet.
The artifacts also included not one, but two CD-ROMs :
Click for larger image
One is a driver and software disc, so no big surprise there. The other has a selection of MP3 files for your shiny new MP3 player. I’m wondering if these should be proactively preserved. I was going to process the files’ metadata and publish it here, for the benefit of search engines. However, while metadata is present, the files don’t conform to any metadata format that FFmpeg/Libav recognize. The files mention Brava Software Inc. in their metadata sections. Still, individual filenames at the end of this post.
Leftovers :
A few other miscellaneous multimedia acquisitions :
I still want to study all of these old multimedia creation programs in depth some day. Theatrix Hollywood is a creative writing game, Wikipedia alleges (I’m a bit rigid with my exact definition of what constitutes a game). Here is an example movie output from this software. Meanwhile, the Mad Dog Multimedia CD-ROM apparently came packaged with a 56X CD-ROM drive (roughly the pinnacle of CD-ROM speeds). I found it has some version of Sonic Foundry’s ACID software, thus making good on the “applications” claim on the CD-ROM copy.
Diamond Rio MP3 Sampler
These are the names of the MP3 files found on the Diamond Rio MP3 sampler for the benefit of search engines.13_days.mp3 albert_einstein_dreams.mp3 a_man_of_many_colours.mp3 anything_for_love.mp3 a_secret_place.mp3 bake_sale.mp3 bigger_than_the_both_of_us.mp3 boogie_beat.mp3 bring_it_on.mp3 buskersoundcheck_hippo.mp3 charm.mp3 chemical_disturbance.mp3 coastin.mp3 credit_is_due.mp3 dance_again.mp3 destiny.mp3 dig_a_little_deeper.mp3 diplomat6_bigmouthshut.mp3 dirty_littlemonster.mp3 dirty.mp3 drivin.mp3 Eric_Clapton_Last_Train.mp3 etude_in_c_sharp_minor_op_42_n.mp3 everybody_here.mp3 freedom_4_all.mp3 grandpas_advice.mp3 groove.mp3 heartland.mp3 he_loved_her_so.mp3 highway_to_hell.mp3 hit_the_ground_runnin.mp3 i_feel_fine_today.mp3 im_not_lost_im_exploring.mp3 into_the_void.mp3 its_alright.mp3 i_will_be_there.mp3 i_will_pass_this_way_again.mp3 juiceboxwilly_hepcat.mp3 just_an_illusion.mp3 keepin_time_by_the_river.mp3 king_of_the_brooklyn_delta.mp3 lovermilou_ringingbell.mp3 middle_aged_rock_and_rollers.mp3 midnight_high.mp3 mr_schwinn.mp3 my_brilliant_masterpiece.mp3 my_gallery.mp3 on_the_river_road.mp3 pouring_rain.mp3 prayer.mp3 rats_in_my_bedroom.mp3 razor_serpent_and_the_dub_mix.mp3 ruthbuzzy_pleasestophangin.mp3 secret_love.mp3 ships.mp3 silence_the_thunder.mp3 sleeping_beauty.mp3 slow_burn.mp3 standing_in_my_own_way.mp3 take_no_prisoners.mp3 takin_up_space.mp3 Taylor_Dayne_Unstoppable.mp3 the_laundromat_song.mp3 the_old_dun_cow.mp3 the_people_i_meet.mp3 trip_trigger_avenue.mp3 tru-luv.mp3 unfortunate_man.mp3 vertigo.mp3 when_she_runs.mp3 where_do_we_go_from_here.mp3 words_of_earnest.mp3
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TVHeadend not using codec copy on an IPTV stream ?
3 avril 2020, par petaireSo I'm using the great TVHeadend, which is in my case a DVB-T or IPTV server that can record greatly some inputs. This is a great piece of software, which I recommend much.



But I'm a little bit confused in here. So I've set up a tvheadend on a raspberry pi 4, because I need for my work to record a lot of tv programs. I appreciate TVheadend very much on an other installation, and so are my coworkers who also needs to use it and not a CLI only interface (that's relevant you'll see).



So when I'm using a simple ffmpeg command like this :



ffmpeg -err_detect ignore_err -i http://mystream -to 00:10:00 -codec copy /media/partage/dvr/test.mp4



my cpu usage goes to something like 1 or 2% percent. But when I'm trying to replicate that in tvheadend, the cpu goes to 400%, and clearly it's not the same behavior.



Here my stream configuration :






Here's the result with ffmpeg codec copy :



General
Complete name : /Volumes/Share/dvr/test2.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 58.3 MiB
Duration : 3mn 20s
Overall bit rate : 2 436 Kbps
Writing application : Lavf58.20.100

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L3.1
Format settings : 2 Ref Frames
Format settings, CABAC : No
Format settings, ReFrames : 2 frames
Format settings, GOP : M=3, N=50
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 3mn 20s
Bit rate : 2 300 Kbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 25.000 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.100
Stream size : 55.0 MiB (94%)
Codec configuration box : avcC

Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 3mn 20s
Bit rate mode : Constant
Bit rate : 128 Kbps
Channel(s) : 1 channel
Channel layout : C
Sampling rate : 44.1 KHz
Frame rate : 43.066 fps (1024 SPF)
Compression mode : Lossy
Stream size : 3.07 MiB (5%)
Language : French
Default : Yes
Alternate group : 1



And the result with tvheadend :



General
Complete name : /Volumes/Share/dvr/2020-04-01/BFMTV/Edition-speciale-BFMTV2020-04-0121-00.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/iso6/mp41)
File size : 8.40 MiB
Duration : 42s 486ms
Overall bit rate : 1 659 Kbps
Movie name : Edition spéciale
Writing application : Lavf58.20.100

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L3.1
Format settings : CABAC / 4 Ref Frames
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 40s 512ms
Bit rate : 11.9 Kbps
Nominal bit rate : 1 500 Kbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Variable
Frame rate : 25.000 fps
Minimum frame rate : 13.885 fps
Maximum frame rate : 25.014 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.001
Stream size : 58.6 KiB (1%)
Writing library : x264 core 155 r2917 0a84d98
Encoding settings : 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=6 / lookahead_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=125 / keyint_min=12 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=abr / mbtree=1 / bitrate=1500 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=1875 / vbv_bufsize=5625 / nal_hrd=none / filler=0 / ip_ratio=1.40 / aq=1:1.00
Codec configuration box : avcC

Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 42s 486ms
Bit rate mode : Constant
Bit rate : 172 bps
Nominal bit rate : 172 Kbps
Channel(s) : 1 channel
Channel layout : C
Sampling rate : 48.0 KHz
Frame rate : 46.875 fps (1024 SPF)
Compression mode : Lossy
Stream size : 915 Bytes (0%)
Language : French
Default : Yes
Alternate group : 1



As you can see, Tvheadend is making a variable bitrate and variable framerate file, which is really bad for Premiere Pro (which is the main goal for all this). Clearly it's transcoding it, which I don't need, in a format that is worst for my workflow.



My Pi4 is on Raspbian Buster, but I've also tried this with the same unfortunate result on libreelec.



Does anyone has any idea ?


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Fastest Way to Compress Video Size Using Library or Algo
3 août 2016, par Muhammd HassanI’m trying to compress high quality video into less size and I’m able to reduce the size of video that I’ve compressed using the following objective-c code :
- (BOOL)convertMovieToMP4:(NSString ) originalMovPath andStoragePath:(NSString ) compMovPath
{
NSURL *tmpSourceUrl = [NSURL fileURLWithPath:originalMovPath];
compMovPath = [compMovPath stringByReplacingOccurrencesOfString:[compMovPath pathExtension] withString:@"mp4"];
NSURL *tmpDestUrl = [NSURL fileURLWithPath:compMovPath];
AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL:tmpSourceUrl options:nil];
AVMutableComposition* mixComposition = [AVMutableComposition composition];
AVMutableCompositionTrack *compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
AVAssetTrack *clipVideoTrack = [[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
[compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration)
ofTrack:clipVideoTrack
atTime:kCMTimeZero error:nil];
[compositionVideoTrack setPreferredTransform:[[[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] preferredTransform]];
CGSize videoSize = [[[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] naturalSize];
CATextLayer *titleLayer = [CATextLayer layer];
titleLayer.string = @"Ojatro";
titleLayer.font = (_bridge CFTypeRef Nullable)(@"Helvetica");
titleLayer.fontSize = videoSize.height / 8;
titleLayer.shadowOpacity = 0.2;
titleLayer.alignmentMode = kCAAlignmentCenter;
titleLayer.bounds = CGRectMake(0, 0, videoSize.width, videoSize.height / 6);
titleLayer.position=CGPointMake(videoSize.width/2, videoSize.height/2);
CALayer *parentLayer = [CALayer layer];
CALayer *videoLayer = [CALayer layer];
parentLayer.frame = CGRectMake(0, 0, videoSize.width, videoSize.height);
videoLayer.frame = CGRectMake(0, 0, videoSize.width, videoSize.height);
[parentLayer addSublayer:videoLayer];
[parentLayer addSublayer:titleLayer];
AVMutableVideoComposition* videoComp = [AVMutableVideoComposition videoComposition];
videoComp.renderSize = videoSize;
videoComp.frameDuration = CMTimeMake(1, 30);
videoComp.animationTool = [AVVideoCompositionCoreAnimationTool videoCompositionCoreAnimationToolWithPostProcessingAsVideoLayer:videoLayer inLayer:parentLayer];
AVMutableVideoCompositionInstruction *instruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction];
instruction.timeRange = CMTimeRangeMake(kCMTimeZero, [mixComposition duration]);
AVAssetTrack *videoTrack = [[mixComposition tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
AVMutableVideoCompositionLayerInstruction* layerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:videoTrack];
instruction.layerInstructions = [NSArray arrayWithObject:layerInstruction];
videoComp.instructions = [NSArray arrayWithObject: instruction];
AVAssetExportSession* _assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetMediumQuality];//AVAssetExportPresetPasst
_assetExport.videoComposition = videoComp;
//NSString* videoName = @"mynewwatermarkedvideo.mov";
NSString *tmpDirPath = [compMovPath stringByReplacingOccurrencesOfString:[compMovPath lastPathComponent] withString:@""];
if ([Utility makeDirectoryAtPath:tmpDirPath])
{
NSLog(@"Directory Created");
}
//exportPath=[exportPath stringByAppendingString:videoName];
NSURL *exportUrl = tmpDestUrl;
if ([[NSFileManager defaultManager] fileExistsAtPath:compMovPath])
{
[[NSFileManager defaultManager] removeItemAtPath:compMovPath error:nil];
}
_assetExport.outputURL = exportUrl;
_assetExport.shouldOptimizeForNetworkUse = YES;
_assetExport.outputFileType = AVFileTypeMPEG4;
//[strRecordedFilename setString: exportPath];
[_assetExport exportAsynchronouslyWithCompletionHandler:
^(void ) {
switch (_assetExport.status)
{
case AVAssetExportSessionStatusUnknown:
NSLog(@"Export Status Unknown");
break;
case AVAssetExportSessionStatusWaiting:
NSLog(@"Export Waiting");
break;
case AVAssetExportSessionStatusExporting:
NSLog(@"Export Status");
break;
case AVAssetExportSessionStatusCompleted:
NSLog(@"Export Completed");
totalFilesCopied++;
[self startProgressBar];
break;
case AVAssetExportSessionStatusFailed:
NSLog(@"Export failed");
break;
case AVAssetExportSessionStatusCancelled:
NSLog(@"Export canceled");
break;
}
}
];
return NO;
}But my main problem is that when I compress the 500MB video (i.e average video) file and it takes approximately 20 to 30+ minutes. It reduce the video size to approximately 130MB. I’m using the Native AVFoundation Library to compress the video to reduce its size.
I need to compress the video size very fast just like Apple Compressor application, it compresses the 500MB file within 30 seconds only...
https://itunes.apple.com/en/app/compressor/id424390742?mt=12
I’ve also used FFMPEG library for that, but that is also slow I did not found that library anymore useful.
I’ve also tried to find the solution using other languages like, java, python. but did not found any solution was found.
If anyone has the solution for this particular problem, or has some libraries (i.e Paid library or Open Source Library) that can do the compression with less time at least 1 minute... Please do share with me. Or some other piece of code that can overcome the compression time problem from 20 - 30 minutes to at least 1 minute.
Thanks...
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