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Autres articles (40)
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Websites made with MediaSPIP
2 mai 2011, parThis page lists some websites based on MediaSPIP.
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Contribute to a better visual interface
13 avril 2011MediaSPIP is based on a system of themes and templates. Templates define the placement of information on the page, and can be adapted to a wide range of uses. Themes define the overall graphic appearance of the site.
Anyone can submit a new graphic theme or template and make it available to the MediaSPIP community. -
Submit enhancements and plugins
13 avril 2011If you have developed a new extension to add one or more useful features to MediaSPIP, let us know and its integration into the core MedisSPIP functionality will be considered.
You can use the development discussion list to request for help with creating a plugin. As MediaSPIP is based on SPIP - or you can use the SPIP discussion list SPIP-Zone.
Sur d’autres sites (8797)
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What are the specifications of Flex usable FLV videos ?
26 septembre 2011, par RiduidelI have a server which streams FLV files to a Flex client.
In this flex client, the video timeline advances incoherently, and no video can be seen on screen (only the sound can be heard).My FLV file has been generated using ffmpeg, which says (about this generated file)
FFmpeg version 0.6, Copyright (c) 2000-2010 the FFmpeg developers
built on Aug 8 2010 04:24:04 with gcc 4.3.2
configuration: --prefix=/home/marpada/ffmpegfull --enable-gpl --enable-version3 --enable-nonfree --disable-ffplay --disable-ffserver --enable-libmp3lame --enable-libfaac --enable-libvpx --enable-libfaad --enable-libvorbis --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libxvid --enable-libx264 --enable-libtheora --extra-ldflags=-static --extra-libs='-lvorbis -logg -lxvidcore -lx264 -lopencore-amrnb -lopencore-amrwb -lfaad -lfaac -lvpx -ltheora -lm -lpthread' --enable-small --enable-runtime-cpudetect
libavutil 50.15. 1 / 50.15. 1
libavcodec 52.72. 2 / 52.72. 2
libavformat 52.64. 2 / 52.64. 2
libavdevice 52. 2. 0 / 52. 2. 0
libswscale 0.11. 0 / 0.11. 0
[flv @ 0x95c6aa0]Estimating duration from bitrate, this may be inaccurate
Seems stream 0 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 25.00 (25/1)
Input #0, flv, from '/appli/perigee_70ri/data/files/ged_bur%0/Imagettes/70ri/279/2/8/20_109021138o.70ri_FLV_preview_.flv':
Metadata:
hasMetadata : true
hasVideo : true
hasAudio : true
duration : 589
lasttimestamp : 589
lastkeyframetimestamp: 589
width : 352
height : 288
videodatarate : 199
framerate : 25
audiodatarate : 125
audiosamplerate : 44100
audiosamplesize : 16
stereo : true
filesize : 25058444
videosize : 15195503
audiosize : 9690850
datasize : 23027
metadatacreator : flvmeta 1.1-r202
audiocodecid : 2
videocodecid : 2
audiodelay : 0
canSeekToEnd : false
hasCuePoints : false
hasKeyframes : true
Duration: 00:09:48.78, start: 0.000000, bitrate: 332 kb/s
Stream #0.0: Video: flv, yuv420p, 352x288, 204 kb/s, 25 tbr, 1k tbn, 1k tbc
Stream #0.1: Audio: mp3, 44100 Hz, 2 channels, s16, 128 kb/s
At least one output file must be specifiedWhich, as far as it seems to me, is OK.
Furthermore, the video plays nice in VLC.
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How to capture camera devices on Windows using Libav ?
22 septembre 2011, par OccultaIs there any way to capture frames from as many camera types as DirectShow do on Windows platform using Libav ? I need to capture a camera output without using DirectShow filters and I want my application to work with many camera devices types.
I have searched the Internet about this capability of libav and found that it can be done via libav using special input format "vfwcap". Something like that (don't sure about code correctness - I wrote it by myself) :
AVFormatParameters formatParams = NULL;
AVInputFormat* pInfmt = NULL;
pInFormatCtx* pInFormatCtx = NULL;
av_register_all();
//formatParams.device = NULL; //this was probably deprecated and then removed
formatParams.channel = 0;
formatParams.standard = "ntsc"; //deprecated too but still available
formatParams.width = 640;
formatParams.height = 480;
formatParams.time_base.num = 1000;
formatParams.time_base.den = 30000; //so we want 30000/1000 = 30 frames per second
formatParams.prealloced_context = 0;
pInfmt = av_find_input_format("vfwcap");
if( !pInfmt )
{
fprintf(stderr,"Unknown input format\n");
return -1;
}
// Open video file (formatParams can be NULL for autodetecting probably)
if (av_open_input_file(&pInFormatCtx, 0, pInfmt, 0, formatParams) < 0)
return -1; // Couldn't open device
/* Same as video4linux code*/So another question is : how many devices are supported by Libav ? All I have found about capture cameras output with libav on windows is advice to use DirectShow for this purpose because libav supports too few devices. Maybe situation has already changed now and it does support enough devices to use it in production applications ?
If this isn't possible.. Well I hope my question won't be useless and this composed from different sources piece of code will help someone interested in this theme 'coz there are really too few information about it in the whole internet.
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During transcoding, does output quality of a video improve when i give output bitrate more than input video's bitrate ?
19 septembre 2013, par Jobin JoseI use ffmpeg for converting videos.
As i understand, the bitrate of a video stream is the number of bits which constitute the video over 1 second of time.
What happens when i specify the output video bitrate to be more than the input video's bitrate ?
For example :
If bitrate of "Input.mp4" is 2000KBps and i want to convert it to "Output.mp4" with output bitrate set to 3000KBps.
How will the converter create the extra 1000 bits(3000-2000) for every second of video ?
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