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999,999
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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The Slip - Artworks
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Texte
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Demon seed (wav version)
26 septembre 2011, par
Mis à jour : Avril 2013
Langue : English
Type : Audio
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The four of us are dying (wav version)
26 septembre 2011, par
Mis à jour : Avril 2013
Langue : English
Type : Audio
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Corona radiata (wav version)
26 septembre 2011, par
Mis à jour : Avril 2013
Langue : English
Type : Audio
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Lights in the sky (wav version)
26 septembre 2011, par
Mis à jour : Avril 2013
Langue : English
Type : Audio
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Ecrire une actualité
21 juin 2013, parPrésentez les changements dans votre MédiaSPIP ou les actualités de vos projets sur votre MédiaSPIP grâce à la rubrique actualités.
Dans le thème par défaut spipeo de MédiaSPIP, les actualités sont affichées en bas de la page principale sous les éditoriaux.
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Sur d’autres sites (6648)
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why AVFrame pts value doesn't affect bitrate of frames ?
31 janvier 2021, par fsdfhdsjkhfjkdsI'm trying code realtime screen sharing I noticed H264 codec doesn't do constant time encode for every frame. That causes being not able to encode exact same amount frame rate with context->time_base. When we encode less frames per second than time_base bitrate of second becomes lower than what we set.


I modified libav's example encode code and put 1/1000 time base and supply it with only 10 frame. I increase frame->pts related with time_base but bitrates still stay at low.


For results I just change
context->time_baseto 1, 1000, 1, 10 etc

1/1000 time base (as sum 1989 bytes per second) :


encoded frame 0 (size=1169)
encoded frame 100 (size=95)
encoded frame 200 (size=92)
encoded frame 300 (size=102)
encoded frame 400 (size=90)
encoded frame 500 (size=90)
encoded frame 600 (size=90)
encoded frame 700 (size=83)
encoded frame 800 (size=95)
encoded frame 900 (size=83)


1/10 time base (as sum 95324 bytes per second) :


encoded frame 0 (size=14187)
encoded frame 1 (size=6053)
encoded frame 2 (size=8530)
encoded frame 3 (size=9277)
encoded frame 4 (size=9508)
encoded frame 5 (size=11163)
encoded frame 6 (size=9685)
encoded frame 7 (size=9346)
encoded frame 8 (size=7662)
encoded frame 9 (size=9913)


code :


#include 
#include 
#include <libavcodec></libavcodec>avcodec.h>

static void encode(AVCodecContext *context, AVFrame *frame, AVPacket *pkt, FILE *outfile){
 int ret = avcodec_send_frame(context, frame);
 assert(ret >= 0);
 while(ret >= 0){
 ret = avcodec_receive_packet(context, pkt);
 if(ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
 return;
 else if(ret < 0)
 assert(0);
 printf("encoded frame %lld (size=%d)\n", pkt->pts, pkt->size);
 fwrite(pkt->data, 1, pkt->size, outfile);
 av_packet_unref(pkt);
 }
}

int main(int argc, char **argv){
 if(argc <= 1){
 fprintf(stderr, "Usage: %s <output file="file">\n", argv[0]);
 exit(0);
 }
 av_log_set_level(AV_LOG_QUIET);
 const char *filename = argv[1];
 const AVCodec *codec = avcodec_find_encoder(AV_CODEC_ID_H264);
 assert(codec);
 AVCodecContext *context = avcodec_alloc_context3(codec);
 assert(context);
 AVFrame *frame = av_frame_alloc();
 assert(frame);
 AVPacket *pkt = av_packet_alloc();
 assert(pkt);
 context->bit_rate = 800000;
 context->width = 1280;
 context->height = 720;
 context->time_base = (AVRational){1, 1000};
 context->pix_fmt = AV_PIX_FMT_YUV420P;
 AVDictionary *dict = 0;
 assert(av_dict_set(&dict, "preset", "veryfast", 0) >= 0);
 assert(av_dict_set(&dict, "tune", "zerolatency", 0) >= 0);
 assert(avcodec_open2(context, codec, &dict) >= 0);
 FILE *f = fopen(filename, "wb");
 assert(f);
 frame->format = context->pix_fmt;
 frame->width = context->width;
 frame->height = context->height;
 assert(av_frame_get_buffer(frame, 0) >= 0);
 for(int i = 0; i < 10; i++){
 for(int y = 0; y < context->height; y++){
 for(int x = 0; x < context->width; x++){
 frame->data[0][y * frame->linesize[0] + x] = x + y + i * 3;
 }
 }
 for(int y = 0; y < context->height / 2; y++){
 for(int x = 0; x < context->width / 2; x++){
 frame->data[1][y * frame->linesize[1] + x] = 128 + y + i * 2;
 frame->data[2][y * frame->linesize[2] + x] = 64 + x + i * 5;
 }
 }
 frame->pts = i * (context->time_base.den / 10);
 encode(context, frame, pkt, f);
 }
 fclose(f);
 avcodec_free_context(&context);
 av_frame_free(&frame);
 av_packet_free(&pkt);
 return 0;
}
</output>

How we can keep right bitrate with different time_base than frame rate ?


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How to stream audio from ffserver
22 mai 2019, par DoroI trying to stream 2 files -
1.mkvwithout audio (which streaming ok) and2.mkvwith audio encoded with Vorbis codec which i can’t stream. For encoding I usedffmpeg -i 2.mp4 -strict -2 -c:a vorbis ex.mkvAnd it playing ok with
ffplayServer log :
Fri May 17 00:49:08 2019 Opening feed file '1.mkv' for stream 'test1-rtsp'
Fri May 17 00:49:08 2019 [matroska,webm @ 0x200746c0]Unknown entry 0x55B0
Thu Dec 14 21:35:00 1950 [h264 @ 0x2007dcc0]gray chroma
Fri May 17 00:49:08 2019 [h264 @ 0x2007dcc0]error while decoding MB 18 1, bytestream 1989
Fri May 17 00:49:08 2019 [h264 @ 0x2007dcc0]concealing 432 DC, 432 AC, 432 MV errors in I frame
Fri May 17 00:49:08 2019 Opening feed file '2.mkv' for stream 'test2-rtsp'
Fri May 17 00:49:08 2019 [matroska,webm @ 0x200746c0]Unknown entry 0x55B0
Fri May 17 00:49:08 2019 FFserver started.
Fri May 17 00:49:25 2019 [matroska,webm @ 0x20080de0]Unknown entry 0x55B0
Fri May 17 00:49:25 2019 127.0.0.1:33582 - - "PLAY test2-rtsp/streamid=0 RTP/UDP"
Fri May 17 00:49:25 2019 127.0.0.1 - - [SETUP] "rtsp://127.0.0.1:7654/test2-rtsp/ RTSP/1.0" 200 2553Client log :
Bad packed header lengths (30,0,1250,2673)
[udp @ 00000236f6318500] 'circular_buffer_size' option was set but it is not supported on this build (pthread support is required)
[udp @ 00000236f63185c0] 'circular_buffer_size' option was set but it is not supported on this build (pthread support is required)
[udp @ 00000236f633dc40] 'circular_buffer_size' option was set but it is not supported on this build (pthread support is required)
[udp @ 00000236f634df00] 'circular_buffer_size' option was set but it is not supported on this build (pthread support is required)
[rtsp @ 00000236f63153c0] method SETUP failed: 503 Service Unavailable
rtsp://127.0.0.1:7654/test2-rtsp: Server returned 5XX Server Error replyConfigure ffserver file :
Port 8090
BindAddress 0.0.0.0
MaxHTTPConnections 2000
MaxClients 1000
MaxBandwidth 500000
CustomLog -
NoDaemon
RTSPPort 7654
RTSPBindAddress 0.0.0.0
<stream>
Format rtp
File "1.mkv"
</stream>
<stream>
Format rtp
Strict -2
AudioCodec vorbis
File "2.mkv"
</stream> -
ffmpeg channels don't work (PHP)
15 avril 2016, par Y.SaadI have a lot of channels with " ffmpeg " (4 channels) that start automatically, I create a code for show the first channel and after 5 seconds show the second .. Etc All things as right but I have a small problem the seconds channel doesn’t start automatically, I need to make stop to the first channel
Code for 4 channel work 100% but without function for show first channel and after 5 seconds show the second ... Etc
<?php
ffmpeg -i http://clay24.webhop.net:8000/live/mario/mario/13.ts -i http://clay24.webhop.net:8000/live/mario/mario/12.ts -i http://clay24.webhop.net:8000/live/mario/mario/10.ts -map 0 -c:a aac -b:a 64k -strict -2 -preset fast -crf 25 -vcodec libx264 -f flv rtmp://178.33.231.108:1989/mylive/1 -map 1 -c:a aac -b:a 64k -strict -2 -preset fast -crf 25 -vcodec libx264 -f flv rtmp://178.33.231.108:1989/mylive/21 -map 2 -c:a aac -b:a 64k -strict -2 -preset fast -crf 25 -vcodec libx264 -f flv rtmp://178.33.231.108:1989/mylive/24
?>the second code with functions
<?php
echo'
<code class="echappe-js"><script><br />
<br />
window.addEventListener("load", function() {<br />
<br />
var urls = iframes = [ "'; ffmpeg -i http://mygameravatar.zapto.org:43666/live/test1/test2/81.ts -c:a aac -b:a 64k -preset fast -crf 25 -vcodec libx264 -f flv rtmp://178.33.231.108:1989/mylive/2 <br />
echo '];<br />
<br />
var iframes = document.querySelectorAll("div");<br />
<br />
var n = 0;<br />
<br />
var interval = setInterval(function() {<br />
<br />
iframes[++n].src = urls[n - 1];<br />
iframes[n].style.display = "block";<br />
console.log(n);<br />
if (n === iframes.length -1) {<br />
clearInterval(interval);<br />
console.log("all iframes loaded")<br />
}<br />
<br />
}, 5000)<br />
<br />
})<br />
</script>’ ;ffmpeg -i http://mygameravatar.zapto.org:43666/live/test1/test2/297.ts -c:a aac -b:a 64k -preset fast -crf 25 -vcodec libx264 -f flv rtmp ://178.33.231.108:1989/mylive/1
echo ’
’ ;
?>
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