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Autres articles (103)
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MediaSPIP 0.1 Beta version
25 avril 2011, parMediaSPIP 0.1 beta is the first version of MediaSPIP proclaimed as "usable".
The zip file provided here only contains the sources of MediaSPIP in its standalone version.
To get a working installation, you must manually install all-software dependencies on the server.
If you want to use this archive for an installation in "farm mode", you will also need to proceed to other manual (...) -
Multilang : améliorer l’interface pour les blocs multilingues
18 février 2011, parMultilang est un plugin supplémentaire qui n’est pas activé par défaut lors de l’initialisation de MediaSPIP.
Après son activation, une préconfiguration est mise en place automatiquement par MediaSPIP init permettant à la nouvelle fonctionnalité d’être automatiquement opérationnelle. Il n’est donc pas obligatoire de passer par une étape de configuration pour cela. -
HTML5 audio and video support
13 avril 2011, parMediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
For older browsers the Flowplayer flash fallback is used.
MediaSPIP allows for media playback on major mobile platforms with the above (...)
Sur d’autres sites (12291)
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Does ReplayGain work on Opus audio files, too, and how do I apply it ?
8 mars 2023, par finefoot

ReplayGain is a proposed technical standard published by David Robinson in 2001 to measure and normalize the perceived loudness of audio in computer audio formats such as MP3 and Ogg Vorbis.




Does ReplayGain work on audio files encoded with Opus, too ? And what's a command-line solution to apply it ?


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Undefined reference, using FFMpeg-library (AvCodec) on Ubuntu, 64-bits system
5 mai 2012, par Anders BranderudI am running the example code of the latest FFMpeg-library.
I have inserted the example code into the filevideofecencoder.c:/*
* copyright (c) 2001 Fabrice Bellard
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
#include
#include
#include
#ifdef HAVE_AV_CONFIG_H
#undef HAVE_AV_CONFIG_H
#endif
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavcodec/avcodec.h"
#include "libavutil/mathematics.h"
#include "libavutil/samplefmt.h"
#define INBUF_SIZE 4096
#define AUDIO_INBUF_SIZE 20480
#define AUDIO_REFILL_THRESH 4096
/*
* Video encoding example
*/
static void video_encode_example(const char *filename, int codec_id)
{
AVCodec *codec;
AVCodecContext *c= NULL;
int i, out_size, size, x, y, outbuf_size;
FILE *f;
AVFrame *picture;
uint8_t *outbuf;
int nrOfFramesPerSecond =25;
int nrOfSeconds =1;
printf("Video encoding\n");
/* find the mpeg1 video encoder */
codec = avcodec_find_encoder((CodecID) codec_id);
if (!codec) {
fprintf(stderr, "codec not found\n");
exit(1);
}
c = avcodec_alloc_context3(codec);
picture= avcodec_alloc_frame();
/* put sample parameters */
c->bit_rate = 400000;
/* resolution must be a multiple of two */
c->width = 352;
c->height = 288;
/* frames per second */
c->time_base= (AVRational){1,25};
c->gop_size = 10; /* emit one intra frame every ten frames */
c->max_b_frames=1;
c->pix_fmt = PIX_FMT_YUV420P;
if(codec_id == CODEC_ID_H264)
av_opt_set(c->priv_data, "preset", "slow", 0);
/* open it */
if (avcodec_open2(c, codec, NULL) < 0) {
fprintf(stderr, "could not open codec\n");
exit(1);
}
f = fopen(filename, "wb");
if (!f) {
fprintf(stderr, "could not open %s\n", filename);
exit(1);
}
/* alloc image and output buffer */
outbuf_size = 100000;
outbuf = (uint8_t*) malloc(outbuf_size);
/* the image can be allocated by any means and av_image_alloc() is
* just the most convenient way if av_malloc() is to be used */
av_image_alloc(picture->data, picture->linesize,
c->width, c->height, c->pix_fmt, 1);
/* encode 1 second of video */
int nrOfFramesTotal = nrOfFramesPerSecond * nrOfSeconds;
/* encode 1 second of video */
for(i=0;i < nrOfFramesTotal; i++) {
fflush(stdout);
/* prepare a dummy image */
/* Y */
for(y=0;yheight;y++) {
for(x=0;xwidth;x++) {
picture->data[0][y * picture->linesize[0] + x] = x + y + i * 3;
}
}
/* Cb and Cr */
for(y=0;yheight/2;y++) {
for(x=0;xwidth/2;x++) {
picture->data[1][y * picture->linesize[1] + x] = 128 + y + i * 2;
picture->data[2][y * picture->linesize[2] + x] = 64 + x + i * 5;
}
}
/* encode the image */
out_size = avcodec_encode_video(c, outbuf, outbuf_size, picture);
printf("encoding frame %3d (size=%5d)\n", i, out_size);
fwrite(outbuf, 1, out_size, f);
}
/* get the delayed frames */
for(; out_size; i++) {
fflush(stdout);
out_size = avcodec_encode_video(c, outbuf, outbuf_size, NULL);
printf("write frame %3d (size=%5d)\n", i, out_size);
fwrite(outbuf, 1, out_size, f);
}
/* add sequence end code to have a real mpeg file */
outbuf[0] = 0x00;
outbuf[1] = 0x00;
outbuf[2] = 0x01;
outbuf[3] = 0xb7;
fwrite(outbuf, 1, 4, f);
fclose(f);
free(outbuf);
avcodec_close(c);
av_free(c);
av_free(picture->data[0]);
av_free(picture);
printf("\n");
}
int main(int argc, char **argv)
{
const char *filename;
/* register all the codecs */
avcodec_register_all();
if (argc <= 1) {
video_encode_example("/grb_1.mpg", CODEC_ID_MPEG1VIDEO);
} else {
filename = argv[1];
}
return 0;
}When I run
gcc videofecencoder.cc -lavcodecI get the following error messages :/tmp/ccJg8IDy.o: In function `video_encode_example(char const*, int)':
videofecencoder.cc:(.text+0x35): undefined reference to `avcodec_find_encoder(CodecID)'
videofecencoder.cc:(.text+0x74): undefined reference to `avcodec_alloc_context3(AVCodec*)'
videofecencoder.cc:(.text+0x7d): undefined reference to `avcodec_alloc_frame()'
videofecencoder.cc:(.text+0x113): undefined reference to `av_opt_set(void*, char const*, char const*, int)'
videofecencoder.cc:(.text+0x12b): undefined reference to `avcodec_open2(AVCodecContext*, AVCodec*, AVDictionary**)'
videofecencoder.cc:(.text+0x1f0): undefined reference to `av_image_alloc(unsigned char**, int*, int, int, PixelFormat, int)'
videofecencoder.cc:(.text+0x35c): undefined reference to `avcodec_encode_video(AVCodecContext*, unsigned char*, int, AVFrame const*)'
videofecencoder.cc:(.text+0x3cf): undefined reference to `avcodec_encode_video(AVCodecContext*, unsigned char*, int, AVFrame const*)'
videofecencoder.cc:(.text+0x47c): undefined reference to `avcodec_close(AVCodecContext*)'
videofecencoder.cc:(.text+0x488): undefined reference to `av_free(void*)'
videofecencoder.cc:(.text+0x497): undefined reference to `av_free(void*)'
videofecencoder.cc:(.text+0x4a3): undefined reference to `av_free(void*)'
/tmp/ccJg8IDy.o: In function `main':
videofecencoder.cc:(.text+0x4c3): undefined reference to `avcodec_register_all()'
collect2: ld returnerade avslutningsstatus 1The command
nm libavcodec.a | grep avcodec_findresults in :00000000000008e0 T avcodec_find_best_pix_fmt
0000000000000740 T avcodec_find_best_pix_fmt2
U avcodec_find_encoder
0000000000002ca0 T avcodec_find_decoder
0000000000002cf0 T avcodec_find_decoder_by_name
0000000000002bd0 T avcodec_find_encoder
0000000000002c30 T avcodec_find_encoder_by_nameI also have another similar error with another library :
Undefined reference despite linking in OpenFEC-libraryMy system : Ubuntu 11, 64-bits machine
My next step is to try to compile it on VirtualBox with Ubuntu 32 bits (running on a Windows-OS).
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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>
 <segmenturl mediarange="190365-448322" indexrange="190365-190416"></segmenturl>
 <segmenturl mediarange="448323-628609" indexrange="448323-448374"></segmenturl>
 <segmenturl mediarange="628610-741660" indexrange="628610-628661"></segmenturl>
 <segmenturl mediarange="741661-1149015" indexrange="741661-741712"></segmenturl>
 <segmenturl mediarange="1149016-1761260" indexrange="1149016-1149067"></segmenturl>
 <segmenturl mediarange="1761261-1829636" indexrange="1761261-1761312"></segmenturl>
 <segmenturl mediarange="1829637-2343368" indexrange="1829637-1829688"></segmenturl>
 <segmenturl mediarange="2343369-2759155" indexrange="2343369-2343420"></segmenturl>
 <segmenturl mediarange="2759156-3120911" indexrange="2759156-2759207"></segmenturl>
 <segmenturl mediarange="3120912-3255416" indexrange="3120912-3120963"></segmenturl>
 <segmenturl mediarange="3255417-3617692" indexrange="3255417-3255468"></segmenturl>
 <segmenturl mediarange="3617693-3910773" indexrange="3617693-3617744"></segmenturl>
 <segmenturl mediarange="3910774-4097693" indexrange="3910774-3910825"></segmenturl>
 <segmenturl mediarange="4097694-4266685" indexrange="4097694-4097745"></segmenturl>
 <segmenturl mediarange="4266686-4609479" indexrange="4266686-4266737"></segmenturl>
 <segmenturl mediarange="4609480-4719699" indexrange="4609480-4609531"></segmenturl>
 <segmenturl mediarange="4719700-4833193" indexrange="4719700-4719751"></segmenturl>
 <segmenturl mediarange="4833194-4905000" indexrange="4833194-4833245"></segmenturl>
 <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>
 <segmenturl mediarange="765-82409" indexrange="765-816"></segmenturl>
 <segmenturl mediarange="82410-163592" indexrange="82410-82461"></segmenturl>
 <segmenturl mediarange="163593-244493" indexrange="163593-163644"></segmenturl>
 <segmenturl mediarange="244494-325181" indexrange="244494-244545"></segmenturl>
 <segmenturl mediarange="325182-406218" indexrange="325182-325233"></segmenturl>
 <segmenturl mediarange="406219-487174" indexrange="406219-406270"></segmenturl>
 <segmenturl mediarange="487175-568100" indexrange="487175-487226"></segmenturl>
 <segmenturl mediarange="568101-649853" indexrange="568101-568152"></segmenturl>
 <segmenturl mediarange="649854-732519" indexrange="649854-649905"></segmenturl>
 <segmenturl mediarange="732520-813751" indexrange="732520-732571"></segmenturl>
 <segmenturl mediarange="813752-895429" indexrange="813752-813803"></segmenturl>
 <segmenturl mediarange="895430-976537" indexrange="895430-895481"></segmenturl>
 <segmenturl mediarange="976538-1058579" indexrange="976538-976589"></segmenturl>
 <segmenturl mediarange="1058580-1139556" indexrange="1058580-1058631"></segmenturl>
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 <segmenturl mediarange="1301724-1382546" indexrange="1301724-1301775"></segmenturl>
 <segmenturl mediarange="1382547-1464086" indexrange="1382547-1382598"></segmenturl>
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 <segmenturl mediarange="1546574-1627881" indexrange="1546574-1546625"></segmenturl>
 <segmenturl mediarange="1627882-1710185" indexrange="1627882-1627933"></segmenturl>
 <segmenturl mediarange="1710186-1791593" indexrange="1710186-1710237"></segmenturl>
 <segmenturl mediarange="1791594-1872889" indexrange="1791594-1791645"></segmenturl>
 <segmenturl mediarange="1872890-1954238" indexrange="1872890-1872941"></segmenturl>
 <segmenturl mediarange="1954239-2036069" indexrange="1954239-1954290"></segmenturl>
 <segmenturl mediarange="2036070-2117365" indexrange="2036070-2036121"></segmenturl>
 <segmenturl mediarange="2117366-2198435" indexrange="2117366-2117417"></segmenturl>
 <segmenturl mediarange="2198436-2279764" indexrange="2198436-2198487"></segmenturl>
 <segmenturl mediarange="2279765-2362061" indexrange="2279765-2279816"></segmenturl>
 <segmenturl mediarange="2362062-2443751" indexrange="2362062-2362113"></segmenturl>
 <segmenturl mediarange="2443752-2446358" indexrange="2443752-2443803"></segmenturl>
 </segmentlist>
 </representation>
 </adaptationset>
 <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">
 <initialization range="0-854"></initialization>
 <segmenturl mediarange="855-117134" indexrange="855-906"></segmenturl>
 <segmenturl mediarange="117135-288087" indexrange="117135-117186"></segmenturl>
 <segmenturl mediarange="288088-435178" indexrange="288088-288139"></segmenturl>
 <segmenturl mediarange="435179-520309" indexrange="435179-435230"></segmenturl>
 <segmenturl mediarange="520310-903223" indexrange="520310-520361"></segmenturl>
 <segmenturl mediarange="903224-1458808" indexrange="903224-903275"></segmenturl>
 <segmenturl mediarange="1458809-1524956" indexrange="1458809-1458860"></segmenturl>
 <segmenturl mediarange="1524957-2026894" indexrange="1524957-1525008"></segmenturl>
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 <segmenturl mediarange="2852807-3183174" indexrange="2852807-2852858"></segmenturl>
 <segmenturl mediarange="3183175-3467272" indexrange="3183175-3183226"></segmenturl>
 <segmenturl mediarange="3467273-3653219" indexrange="3467273-3467324"></segmenturl>
 <segmenturl mediarange="3653220-3821184" indexrange="3653220-3653271"></segmenturl>
 <segmenturl mediarange="3821185-4162978" indexrange="3821185-3821236"></segmenturl>
 <segmenturl mediarange="4162979-4273050" indexrange="4162979-4163030"></segmenturl>
 <segmenturl mediarange="4273051-4386223" indexrange="4273051-4273102"></segmenturl>
 <segmenturl mediarange="4386224-4458425" indexrange="4386224-4386275"></segmenturl>
 <segmenturl mediarange="4458426-4597502" indexrange="4458426-4458477"></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-stream3.mp4</baseurl>
 <segmentlist timescale="1000000" duration="5000000" startnumber="1">
 <initialization range="0-764"></initialization>
 <segmenturl mediarange="765-82409" indexrange="765-816"></segmenturl>
 <segmenturl mediarange="82410-163592" indexrange="82410-82461"></segmenturl>
 <segmenturl mediarange="163593-244493" indexrange="163593-163644"></segmenturl>
 <segmenturl mediarange="244494-325181" indexrange="244494-244545"></segmenturl>
 <segmenturl mediarange="325182-406218" indexrange="325182-325233"></segmenturl>
 <segmenturl mediarange="406219-487174" indexrange="406219-406270"></segmenturl>
 <segmenturl mediarange="487175-568100" indexrange="487175-487226"></segmenturl>
 <segmenturl mediarange="568101-649853" indexrange="568101-568152"></segmenturl>
 <segmenturl mediarange="649854-732519" indexrange="649854-649905"></segmenturl>
 <segmenturl mediarange="732520-813751" indexrange="732520-732571"></segmenturl>
 <segmenturl mediarange="813752-895429" indexrange="813752-813803"></segmenturl>
 <segmenturl mediarange="895430-976537" indexrange="895430-895481"></segmenturl>
 <segmenturl mediarange="976538-1058579" indexrange="976538-976589"></segmenturl>
 <segmenturl mediarange="1058580-1139556" indexrange="1058580-1058631"></segmenturl>
 <segmenturl mediarange="1139557-1220802" indexrange="1139557-1139608"></segmenturl>
 <segmenturl mediarange="1220803-1301723" indexrange="1220803-1220854"></segmenturl>
 <segmenturl mediarange="1301724-1382546" indexrange="1301724-1301775"></segmenturl>
 <segmenturl mediarange="1382547-1464086" indexrange="1382547-1382598"></segmenturl>
 <segmenturl mediarange="1464087-1546573" indexrange="1464087-1464138"></segmenturl>
 <segmenturl mediarange="1546574-1627881" indexrange="1546574-1546625"></segmenturl>
 <segmenturl mediarange="1627882-1710185" indexrange="1627882-1627933"></segmenturl>
 <segmenturl mediarange="1710186-1791593" indexrange="1710186-1710237"></segmenturl>
 <segmenturl mediarange="1791594-1872889" indexrange="1791594-1791645"></segmenturl>
 <segmenturl mediarange="1872890-1954238" indexrange="1872890-1872941"></segmenturl>
 <segmenturl mediarange="1954239-2036069" indexrange="1954239-1954290"></segmenturl>
 <segmenturl mediarange="2036070-2117365" indexrange="2036070-2036121"></segmenturl>
 <segmenturl mediarange="2117366-2198435" indexrange="2117366-2117417"></segmenturl>
 <segmenturl mediarange="2198436-2279764" indexrange="2198436-2198487"></segmenturl>
 <segmenturl mediarange="2279765-2362061" indexrange="2279765-2279816"></segmenturl>
 <segmenturl mediarange="2362062-2443751" indexrange="2362062-2362113"></segmenturl>
 <segmenturl mediarange="2443752-2446358" indexrange="2443752-2443803"></segmenturl>
 </segmentlist>
 </representation>
 </adaptationset>
 </period>
</mpd>




<mpd xmlns="urn:mpeg:dash:schema:mpd:2011" profiles="urn:mpeg:dash:profile:isoff-live:2011" type="static" mediapresentationduration="PT5M24.4S" maxsegmentduration="PT5.0S" minbuffertime="PT10.8S">
 <programinformation>
 </programinformation>
 <servicedescription>
 </servicedescription>
 <period start="PT0.0S">
 <adaptationset contenttype="video" startwithsap="1" segmentalignment="true" bitstreamswitching="true" framerate="30/1" maxwidth="854" maxheight="480" par="16:9" lang="und">
 <representation mimetype="video/mp4" codecs="avc1.64001f" bandwidth="750000" width="854" height="480" sar="1280:1281">
 <segmenttemplate timescale="15360" initialization="dash_init_$RepresentationID$.m4s" media="dash_chunk_$RepresentationID$_$Number%05d$.m4s" startnumber="1">
 <segmenttimeline>
 <s t="0" d="95744"></s>
 <s d="93696"></s>
 <s d="117760"></s>
 <s d="126976"></s>
 <s d="152064"></s>
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 <s d="128000" r="1"></s>
 <s d="110080"></s>
 <s d="105984" r="1"></s>
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 <s d="122880"></s>
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 <s d="113152"></s>
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 <s d="91136"></s>
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 <s d="115712"></s>
 <s d="93184"></s>
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 <s d="116736"></s>
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 <s d="153088"></s>
 <s d="121344"></s>
 <s d="130560"></s>
 <s d="87040"></s>
 <s d="81920"></s>
 <s d="128000"></s>
 <s d="99328"></s>
 <s d="128000"></s>
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 <s d="168448"></s>
 <s d="167424"></s>
 <s d="40960"></s>
 </segmenttimeline>
 </segmenttemplate>
 </representation>
 </adaptationset>
 <adaptationset contenttype="audio" startwithsap="1" segmentalignment="true" bitstreamswitching="true" lang="eng">
 <representation mimetype="audio/mp4" codecs="mp4a.40.2" bandwidth="192000" 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>
 <s t="0" d="220160"></s>
 <s d="221184" r="62"></s>
 <s d="151552"></s>
 </segmenttimeline>
 </segmenttemplate>
 </representation>
 </adaptationset>
 <adaptationset contenttype="video" startwithsap="1" segmentalignment="true" bitstreamswitching="true" framerate="30/1" maxwidth="1280" maxheight="720" par="16:9" lang="und">
 <representation mimetype="video/mp4" codecs="avc1.64001f" bandwidth="2048000" width="1280" height="720" sar="1:1">
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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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