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La conservation du net art au musée. Les stratégies à l’œuvre
26 mai 2011
Mis à jour : Juillet 2013
Langue : français
Type : Texte
Autres articles (67)
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Organiser par catégorie
17 mai 2013, parDans MédiaSPIP, une rubrique a 2 noms : catégorie et rubrique.
Les différents documents stockés dans MédiaSPIP peuvent être rangés dans différentes catégories. On peut créer une catégorie en cliquant sur "publier une catégorie" dans le menu publier en haut à droite ( après authentification ). Une catégorie peut être rangée dans une autre catégorie aussi ce qui fait qu’on peut construire une arborescence de catégories.
Lors de la publication prochaine d’un document, la nouvelle catégorie créée sera proposée (...) -
Récupération d’informations sur le site maître à l’installation d’une instance
26 novembre 2010, parUtilité
Sur le site principal, une instance de mutualisation est définie par plusieurs choses : Les données dans la table spip_mutus ; Son logo ; Son auteur principal (id_admin dans la table spip_mutus correspondant à un id_auteur de la table spip_auteurs)qui sera le seul à pouvoir créer définitivement l’instance de mutualisation ;
Il peut donc être tout à fait judicieux de vouloir récupérer certaines de ces informations afin de compléter l’installation d’une instance pour, par exemple : récupérer le (...) -
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 (...)
Sur d’autres sites (2560)
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libvlc ffmpeg : No seek in mpegts h264 stream
26 juillet 2016, par ElDoradoI am using ffmpeg to record video input from GDI (windows screen recorder) to view it later using VLC (via ActiveX plugin) + ffmpeg to decode it.
Right now seeking in video is not working in VLC via plugin (which is critical). VLC player itself provide seeking, but it is more like byte position seeking (on I- frames which are larger than other frames it makes larger steps on horizontal scroll and also there are no timestamps).
Encoder is opened with next defaults :
avformat_alloc_output_context2(&outputContext, NULL, "mpegts", "test.mpg");
outputFormat = outputContext->oformat;
encoder = avcodec_find_encoder(AV_CODEC_ID_H264);
outputStream = avformat_new_stream(outputContext, encoder);
outputStream->id = outputContext->nb_streams - 1;
encoderContext = outputStream->codec;
encoderContext->bit_rate = bitrate; // 800000 by default
encoderContext->rc_max_rate = bitrate;
encoderContext->width = imageWidth; // 1920
encoderContext->height = imageHeight; // 1080
encoderContext->time_base.num = 1;
encoderContext->time_base.den = fps; // 25 by default
encoderContext->gop_size = fps;
encoderContext->keyint_min = fps;
encoderContext->max_b_frames = 0;
encoderContext->pix_fmt = AV_PIX_FMT_YUV420P;
outputStream->time_base = encoderContext->time_base;
avcodec_open2(encoderContext, encoder, NULL);Recording is done this way :
// my impl of GDI recorder, returning AVFrame with only data and linesize filled.
AVFrame* tmp_frame = impl_->recorder->acquireFrame();
// converting RGB -> YUV420
sws_scale(impl_->scaleContext, tmp_frame->data, tmp_frame->linesize, 0, impl_->frame->height, impl_->frame->data, impl_->frame->linesize);
// pts variable is calculated by using QueryPerformanceCounter form WinAPI. It is strictly increasing
impl_->frame->pts = pts;
avcodec_encode_video2(impl_->encoderContext, impl_->packet, impl_->frame, &out_size);
if (out_size) {
impl_->packet->pts = pts;
impl_->packet->dts = pts;
impl_->packet->duration = 1; // here it is! It is set but has no effect
av_packet_rescale_ts(impl_->packet, impl_->encoderContext->time_base, impl_->outputStream->time_base);
// here pts = 3600*pts, dts = 3600*pts, duration = 3600 what I consider to be legit in terms of milliseconds
impl_->packet->stream_index = impl_->outputStream->index;
av_interleaved_write_frame(impl_->outputContext, impl_->packet);
av_packet_unref(impl_->packet);
out_size = 0;
}ffprobe is providing next info on frames :
[FRAME]
media_type=video
stream_index=0
key_frame=1
pkt_pts=3600
pkt_pts_time=0:00:00.040000
pkt_dts=3600
pkt_dts_time=0:00:00.040000
best_effort_timestamp=3600
best_effort_timestamp_time=0:00:00.040000
pkt_duration=N/A
pkt_duration_time=N/A
pkt_pos=564
pkt_size=97.018555 Kibyte
width=1920
height=1080
pix_fmt=yuv420p
sample_aspect_ratio=N/A
pict_type=I
coded_picture_number=0
display_picture_number=0
interlaced_frame=0
top_field_first=0
repeat_pict=0
[/FRAME]I believe that problem is in
pkt_durationvariable, though it was set.
What I am doing wrong in recording so I can’t seek in video ?P.S. on other videos (also h264) seeking is working in ActiveX VLC plugin.
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Add padding with ffmpeg to videos increases file size, why ?
12 mars 2023, par try2getsmarterI need to add padding to mp4 video files (since tv changes aspect ratio on playback) and I simply can do this with -pad option of ffmpeg.


The output is ok for me, but I see that most of the video files increase about 25%-30% in file size.


ffmpeg -i in.mp4 -preset slow -vf "pad=1920:1080 :(1920-iwmin(1920/iw,1080/ih))/2 :(1080-ihmin(1920/iw,1080/ih))/2" -c:v h264 -c:a copy out_fhd.mp4"


Is there a way to preserve the input quality and have the same file size ? As the black bars contain no information I had the expectation that there is a lossless mode to take the already H264 encoded stream and just add blocks with black pixels.


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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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 </representation>
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 <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>
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 <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="300000" width="1280" height="720" sar="1:1">
 <baseurl>dash-stream2.mp4</baseurl>
 <segmentlist timescale="1000000" duration="5000000" startnumber="1">
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 <audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"></audiochannelconfiguration>
 <baseurl>dash-stream3.mp4</baseurl>
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 <programinformation>
 </programinformation>
 <servicedescription>
 </servicedescription>
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 <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>
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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 !


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