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Bug de détection d’ogg
22 mars 2013, par
Mis à jour : Avril 2013
Langue : français
Type : Video
Autres articles (12)
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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. -
La sauvegarde automatique de canaux SPIP
1er avril 2010, parDans le cadre de la mise en place d’une plateforme ouverte, il est important pour les hébergeurs de pouvoir disposer de sauvegardes assez régulières pour parer à tout problème éventuel.
Pour réaliser cette tâche on se base sur deux plugins SPIP : Saveauto qui permet une sauvegarde régulière de la base de donnée sous la forme d’un dump mysql (utilisable dans phpmyadmin) mes_fichiers_2 qui permet de réaliser une archive au format zip des données importantes du site (les documents, les éléments (...) -
Les notifications de la ferme
1er décembre 2010, parAfin d’assurer une gestion correcte de la ferme, il est nécessaire de notifier plusieurs choses lors d’actions spécifiques à la fois à l’utilisateur mais également à l’ensemble des administrateurs de la ferme.
Les notifications de changement de statut
Lors d’un changement de statut d’une instance, l’ensemble des administrateurs de la ferme doivent être notifiés de cette modification ainsi que l’utilisateur administrateur de l’instance.
À la demande d’un canal
Passage au statut "publie"
Passage au (...)
Sur d’autres sites (4911)
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How parse and decode H264 file with libav/ffmpeg ?
12 août 2022, par isrepeatAccording to official documentations I try decode my
test.mp4withAV_CODEC_ID_H264.

Of course I can do this with
av_read_frame(), but how do it withav_parser_parse2()?

The problem occurs at
avcodec_send_packet(...)atdecode_nal_units(...)atff_h2645_packet_split(...)[h264dec.c]

extern "C" {
#include <libavcodec></libavcodec>avcodec.h>
#include <libavformat></libavformat>avformat.h>
}

//#define INBUF_SIZE 4096
#define INBUF_SIZE 256000

void decode(AVCodecContext* dec_ctx, AVFrame* frame, AVPacket* pkt, const char* filename);

int main(int argc, char** argv)
{
 const char* filename;
 const AVCodec* codec;
 AVFormatContext* formatCtx = NULL;
 AVCodecParserContext* parser;
 AVCodecContext* c = NULL;
 AVStream* videoStream = NULL;
 FILE* f;
 AVFrame* frame;
 uint8_t inbuf[INBUF_SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
 uint8_t* data;
 size_t data_size;
 int ret;
 AVPacket* pkt;

 filename = "D:\\test.mp4";

 //if (avformat_open_input(&formatCtx, filename, nullptr, nullptr) < 0) {
 // throw std::exception("Could not open source file");
 //}

 //if (avformat_find_stream_info(formatCtx, nullptr) < 0) {
 // throw std::exception("Could not find stream information");
 //}

 //videoStream = formatCtx->streams[0];



 pkt = av_packet_alloc();
 if (!pkt)
 exit(1);

 /* set end of buffer to 0 (this ensures that no overreading happens for damaged MPEG streams) */
 memset(inbuf + INBUF_SIZE, 0, AV_INPUT_BUFFER_PADDING_SIZE);

 /* find the MPEG-1 video decoder */
 //codec = avcodec_find_decoder(AV_CODEC_ID_MPEG1VIDEO);
 codec = avcodec_find_decoder(AV_CODEC_ID_H264);
 if (!codec) {
 fprintf(stderr, "Codec not found\n");
 exit(1);
 }

 parser = av_parser_init(codec->id);
 if (!parser) {
 fprintf(stderr, "parser not found\n");
 exit(1);
 }

 parser->flags = PARSER_FLAG_COMPLETE_FRAMES;

 c = avcodec_alloc_context3(codec);
 if (!c) {
 fprintf(stderr, "Could not allocate video codec context\n");
 exit(1);
 }

 /* For some codecs, such as msmpeg4 and mpeg4, width and height
 MUST be initialized there because this information is not
 available in the bitstream. */

 //avcodec_parameters_to_context(c, videoStream->codecpar);

 /* open it */
 if (avcodec_open2(c, codec, NULL) < 0) {
 fprintf(stderr, "Could not open codec\n");
 exit(1);
 }

 f = fopen(filename, "rb");
 if (!f) {
 fprintf(stderr, "Could not open %s\n", filename);
 exit(1);
 }

 frame = av_frame_alloc();
 if (!frame) {
 fprintf(stderr, "Could not allocate video frame\n");
 exit(1);
 }

 // ---- Use parser to get packets ----
 while (!feof(f)) {
 /* read raw data from the input file */
 data_size = fread(inbuf, 1, INBUF_SIZE, f);
 if (!data_size)
 break;

 /* use the parser to split the data into frames */
 data = inbuf;
 while (data_size > 0) {
 ret = av_parser_parse2(parser, c, &pkt->data, &pkt->size, data, data_size, AV_NOPTS_VALUE, AV_NOPTS_VALUE, 0);
 if (ret < 0) {
 fprintf(stderr, "Error while parsing\n");
 exit(1);
 }
 data += ret;
 data_size -= ret;

 if (pkt->size)
 decode(c, frame, pkt, outfilename);
 }
 }

 // ---- Use FormatContext to get packets ----
 // while (av_read_frame(fmt_ctx, pkt) == 0)
 // {
 // if (pkt->stream_index == AVMEDIA_TYPE_VIDEO) {
 // if (pkt->size > 0)
 // decode(cdc_ctx, frame, pkt, fp_out);
 // }
 // }

 /* flush the decoder */
 decode(c, frame, NULL, outfilename);

 fclose(f);

 av_parser_close(parser);
 avcodec_free_context(&c);
 av_frame_free(&frame);
 av_packet_free(&pkt);

 return 0;
}

void decode(AVCodecContext* dec_ctx, AVFrame* frame, AVPacket* pkt, const char* filename)
{
 char buf[1024];
 int ret;

 ret = avcodec_send_packet(dec_ctx, pkt);
 if (ret < 0) {
 char buff[255]{ 0 };
 std::string strError = av_make_error_string(buff, 255, ret);
 fprintf(stderr, "Error sending a packet for decoding\n");
 exit(1);
 }

 while (ret >= 0) {
 ret = avcodec_receive_frame(dec_ctx, frame);
 if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
 return;
 else if (ret < 0) {
 fprintf(stderr, "Error during decoding\n");
 exit(1);
 }

 printf("saving frame %3d\n", dec_ctx->frame_number);
 fflush(stdout);
 /* the picture is allocated by the decoder. no need to
 free it */
 // handle frame ...
 }
}


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ffmpeg hls video recording timing information is inaccurate
28 juin 2018, par HarisI am recording the rtsp stream in HLS format which is working fine with below command.
~/bin/ffmpeg -i rtsp://10.0.7.39:554/media/live/1/1 -c:a aac -c:v copy -hls_list_size 65535 -hls_time 2 live.m3u8But when I check the duration of each
tsfile withlive.m3u8file content the value is not accurate.Here is the live.m3u8
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:2
#EXT-X-MEDIA-SEQUENCE:0
#EXTINF:2.000000,
live0.ts
#EXTINF:2.000000,
live1.ts
#EXTINF:1.200000,
live2.ts
#EXTINF:2.500000,
live3.ts
#EXTINF:2.000000,
live4.ts
#EXTINF:2.600000,
live5.ts
#EXTINF:1.700000,
live6.ts
#EXT-X-ENDLISTAnd when I check the timing information of the ts file
live2.tsusing the command,~/bin/ffprobe -i live2.ts -show_entries format=duration -v quiet -of csv="p=0"I am getting the value
2.136000where as in m3u8 file it is1.20000.I have build the latest FFMPEG based on official guild https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu.
OS : Ubuntu 12.04
ffmpeg Version
$~/bin//ffmpeg -version
ffmpeg version N-91369-g4ac88ba Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 4.8 (Ubuntu 4.8.1-2ubuntu1~12.04)
configuration: --prefix=/home/haris/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/haris/ffmpeg_build/include --extra-ldflags=-L/home/haris/ffmpeg_build/lib --extra-libs='-lpthread -lm' --bindir=/home/haris/bin --enable-gpl --enable-libaom --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
libavutil 56. 18.102 / 56. 18.102
libavcodec 58. 20.104 / 58. 20.104
libavformat 58. 17.101 / 58. 17.101
libavdevice 58. 4.101 / 58. 4.101
libavfilter 7. 25.100 / 7. 25.100
libswscale 5. 2.100 / 5. 2.100
libswresample 3. 2.100 / 3. 2.100
libpostproc 55. 2.100 / 55. 2.100Note
If I tested the same command in Ubuntu 16.04 where ffmpeg installed with
apt-getevery thing works fine.Here is the ffmpeg details
$ ~/bin/ffmpeg -version
ffmpeg version 2.8.14-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.9) 20160609
configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
libavutil 54. 31.100 / 54. 31.100
libavcodec 56. 60.100 / 56. 60.100
libavformat 56. 40.101 / 56. 40.101
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 40.101 / 5. 40.101
libavresample 2. 1. 0 / 2. 1. 0
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 2.101 / 1. 2.101
libpostproc 53. 3.100 / 53. 3.100What could be the cause, any help will be appreciated.
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ffmpeg hls video recording timing inforamtion is inaccurate
27 juin 2018, par HarisI am recording the rtsp stream in HLS format which is working fine with below command.
~/bin/ffmpeg -i rtsp://10.0.7.39:554/media/live/1/1 -c:a aac -c:v copy -hls_list_size 65535 -hls_time 2 live.m3u8But when I check the the duration of each
tsfile withlive.m3u8file content the value is not accurate.Here is the live.m3u8
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:2
#EXT-X-MEDIA-SEQUENCE:0
#EXTINF:2.000000,
live0.ts
#EXTINF:2.000000,
live1.ts
#EXTINF:1.200000,
live2.ts
#EXTINF:2.500000,
live3.ts
#EXTINF:2.000000,
live4.ts
#EXTINF:2.600000,
live5.ts
#EXTINF:1.700000,
live6.ts
#EXT-X-ENDLISTAnd when I check the timing information of the ts file
live2.tsusing the command,~/bin/ffprobe -i live2.ts -show_entries format=duration -v quiet -of csv="p=0"I am getting the value
2.136000where as in m3u8 file it is1.20000.I have build the latest FFMPEG based on official guild https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu.
OS : Ubuntu 12.04
ffmpeg Version
$~/bin//ffmpeg -version
ffmpeg version N-91369-g4ac88ba Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 4.8 (Ubuntu 4.8.1-2ubuntu1~12.04)
configuration: --prefix=/home/haris/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/haris/ffmpeg_build/include --extra-ldflags=-L/home/haris/ffmpeg_build/lib --extra-libs='-lpthread -lm' --bindir=/home/haris/bin --enable-gpl --enable-libaom --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
libavutil 56. 18.102 / 56. 18.102
libavcodec 58. 20.104 / 58. 20.104
libavformat 58. 17.101 / 58. 17.101
libavdevice 58. 4.101 / 58. 4.101
libavfilter 7. 25.100 / 7. 25.100
libswscale 5. 2.100 / 5. 2.100
libswresample 3. 2.100 / 3. 2.100
libpostproc 55. 2.100 / 55. 2.100Note
If I tested the same command in Ubuntu 16.04 where ffmpeg installed with
apt-getevery thing works fine.Here is the ffmpeg details
$ ~/bin/ffmpeg -version
ffmpeg version 2.8.14-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.9) 20160609
configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
libavutil 54. 31.100 / 54. 31.100
libavcodec 56. 60.100 / 56. 60.100
libavformat 56. 40.101 / 56. 40.101
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 40.101 / 5. 40.101
libavresample 2. 1. 0 / 2. 1. 0
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 2.101 / 1. 2.101
libpostproc 53. 3.100 / 53. 3.100What could be the cause, any help will be appreciated.
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