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Médias (1)
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The Great Big Beautiful Tomorrow
28 octobre 2011, par
Mis à jour : Octobre 2011
Langue : English
Type : Texte
Autres articles (76)
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Configurer la prise en compte des langues
15 novembre 2010, parAccéder à la configuration et ajouter des langues prises en compte
Afin de configurer la prise en compte de nouvelles langues, il est nécessaire de se rendre dans la partie "Administrer" du site.
De là, dans le menu de navigation, vous pouvez accéder à une partie "Gestion des langues" permettant d’activer la prise en compte de nouvelles langues.
Chaque nouvelle langue ajoutée reste désactivable tant qu’aucun objet n’est créé dans cette langue. Dans ce cas, elle devient grisée dans la configuration et (...) -
Les formats acceptés
28 janvier 2010, parLes commandes suivantes permettent d’avoir des informations sur les formats et codecs gérés par l’installation local de ffmpeg :
ffmpeg -codecs ffmpeg -formats
Les format videos acceptés en entrée
Cette liste est non exhaustive, elle met en exergue les principaux formats utilisés : h264 : H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 m4v : raw MPEG-4 video format flv : Flash Video (FLV) / Sorenson Spark / Sorenson H.263 Theora wmv :
Les formats vidéos de sortie possibles
Dans un premier temps on (...) -
Emballe médias : à quoi cela sert ?
4 février 2011, parCe plugin vise à gérer des sites de mise en ligne de documents de tous types.
Il crée des "médias", à savoir : un "média" est un article au sens SPIP créé automatiquement lors du téléversement d’un document qu’il soit audio, vidéo, image ou textuel ; un seul document ne peut être lié à un article dit "média" ;
Sur d’autres sites (8141)
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ffmpeg screen recording with camera overlay on OSX
8 novembre 2015, par lockdocI would like to use ffmpeg to record my desktop as well as my camera as an overlay on top of the desktop.
So basically I will have two input sources that need to be recorded
$ ffmpeg -f avfoundation -list_devices true -i ''
[AVFoundation input device @ 0x7fded1c223e0] AVFoundation video devices:
[AVFoundation input device @ 0x7fded1c223e0] [0] FaceTime HD Camera
[AVFoundation input device @ 0x7fded1c223e0] [1] Capture screen 0
[AVFoundation input device @ 0x7fded1c223e0] AVFoundation audio devices:
[AVFoundation input device @ 0x7fded1c223e0] [0] Built-in MicrophoneFrom the above, I need [0] FaceTime HD Camera as an overlay and [1] Capture screen 0 as the main video.
Is this even possible ?
UPDATE (2015-10-06) :
I found the following command from ffscreencast :
ffmpeg \
-f avfoundation -i "1" \
-f avfoundation -r 30 -video_size 640x480 -i "0" \
-c:v libx264 -crf 0 -preset ultrafast \
-filter_complex 'overlay=main_w-overlay_w-10:main_h-overlay_h-10' "out.mkv"Unfortunately the output has a pretty slow framerate (i7 Macbook Pro 2014)
Output #0, matroska, to 'out.mkv':
Metadata:
encoder : Lavf56.40.101
Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv420p, 3840x2400, q=-1--1, 1000k fps, 1k tbn, 1000k tbc (default)
Metadata:
encoder : Lavc56.60.100 libx264
Stream mapping:
Stream #0:0 (rawvideo) -> overlay:main
Stream #1:0 (rawvideo) -> overlay:overlay
overlay -> Stream #0:0 (libx264)
frame= 756 fps=9.1 q=-1.0 Lsize= 193660kB time=00:01:21.86 bitrate=19378.5kbits/s
Press [q] to stop, [?] for helpAnyone an idea of how to get a higher framerate ?
My camera is only able to record at 30 frames per second, but the output seems to only have around 9 frames. Why the difference ? -
How to use av_free, av_frame_free, and av_free_packet to avoid memory leak in ffmpeg ?
22 septembre 2015, par Liu YitengI have written code to decode and show video frames with ffmpeg and opencv.The video was successfully played but, I noticed usage of memory is too high(>500MB).
I believe I have called av_free and av_frame_free after decoding every frame.
Can anybody help me and point out what’s wrong with it ?code :
main.cpp:
#include
#include <iostream>
#include <string>
#include "AvCodecContainer.h"
#include <thread>
#include <chrono>
#define _CRTDBG_MAP_ALLOC
#include
using namespace cv;
using namespace std;
int main()
{
Mat* img;
AvCodecContainer* avc = AvCodecContainer::getInstance();
const char* file = "C:\\Users\\Shinelon\\Documents\\Visual Studio 2015\\Projects\\opencv + ffmpegtest\\Debug\\test.mp4";
avc->preparefile("D:\\test.mp4");
int framenum = 0;
for (;;)
{
int res;
res = avc->tryNextFrame();
if (res == 0)
{
decode_frame frame = avc->getCurrentFrame();
if (frame.data == nullptr)
continue;
cv::Mat* pMat = new cv::Mat();
pMat->create(cv::Size(frame.width, frame.height), CV_8UC3);
memcpy(pMat->data, frame.data, frame.width * frame.height * 3);
if (pMat->empty())
{
cout << "error";
return -1;
}
imshow("cvVideo", *pMat);
framenum++;
printf("Frame %d, time = %f s\n", framenum, framenum * avc->interval);
cv::waitKey((int)(avc->interval*1000));
pMat->release();
}
else
{
printf("end");
_CrtDumpMemoryLeaks();
waitKey(100000);
return 0;
}
}
return 0;
}
</chrono></thread></string></iostream>AvCodecContainer.cpp
#include "AvCodecContainer.h"
bool AvCodecContainer::mAV_Registered = false;
AvCodecContainer* AvCodecContainer::mInstance = NULL;
AvCodecContainer* AvCodecContainer::getInstance()
{
if (!mAV_Registered)
{
av_register_all();
mAV_Registered = true;
}
if (mInstance == nullptr)
mInstance = new AvCodecContainer();
return mInstance;
}
int AvCodecContainer::preparefile(char* filename)
{
// 打开视频文件
mAV_Prepare_success = false;
int result;
result = avformat_open_input(&pFormatCtx, filename, NULL, NULL);
if (result < 0)
{
char s[AV_ERROR_MAX_STRING_SIZE];
av_make_error_string(s, AV_ERROR_MAX_STRING_SIZE, result);
printf("%s", s);
return result;
}
// 取出流信息
result = avformat_find_stream_info(pFormatCtx, NULL);
if (result < 0)
{
char s[AV_ERROR_MAX_STRING_SIZE];
av_make_error_string(s, AV_ERROR_MAX_STRING_SIZE, result);
printf("%s", s);
return result;
}
//handle_error(); // 不能够找到流信息
//遍历文件的各个流，找到第一个视频流，并记录该流的编码信息
int videoindex = -1;
for (int i = 0; inb_streams; i++)
{
if (pFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
{
double fps = av_q2d(pFormatCtx->streams[i]->r_frame_rate);
interval = 1.0 / fps;
videoindex = i;
break;
}
}
if (videoindex == -1)
{
printf("Didn't find a video stream.\n");
return videoindex;
}
this->videoIndex = videoindex;
pCodecCtx = pFormatCtx->streams[videoindex]->codec;
pCodec = avcodec_find_decoder(pCodecCtx->codec_id);
if (pCodec == NULL)
return -9999;
// handle_error(); // 找不到解码器
result = avcodec_open2(pCodecCtx, pCodec, NULL); //打开解码器
if (result >= 0)
{
mAV_Prepare_success = true;
//输出一下信息-----------------------------
printf("文件信息-----------------------------------------\n");
av_dump_format(pFormatCtx, 0, filename, 0);
//av_dump_format只是个调试函数，输出文件的音、视频流的基本信息了，帧率、分辨率、音频采样等等
printf("-------------------------------------------------\n");
}
return result;
}
int AvCodecContainer::reset()
{
return 0;
}
decode_frame AvCodecContainer::getCurrentFrame()
{
int ret;
int got_picture;
//通过下面的api进行解码一帧数据，将有效的图像数据存储到pAvFrame成员变量中
if (packet->stream_index == videoIndex)
{
pAvFrame = av_frame_alloc();
ret = avcodec_decode_video2(pCodecCtx, pAvFrame, &got_picture, packet);
//将YUV420p颜色编码转换成BGR颜色编码
if (!got_picture)
{
av_free_packet(packet);
av_frame_unref(pAvFrame);
av_frame_free(&pAvFrame);
packet = nullptr;
pAvFrame = nullptr;
return decode_frame(nullptr, -1, -1);
}
else if (colorContext == nullptr)
colorContext = sws_getContext(pCodecCtx->width, pCodecCtx->height,
pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height,
AV_PIX_FMT_BGR24, SWS_BICUBIC, NULL, NULL, NULL);
//再得到为BGR格式帧分配内存
AVFrame *pFrameRGB = NULL;
uint8_t *out_bufferRGB = NULL;
pFrameRGB = av_frame_alloc();
//给pFrameRGB帧加上分配的内存;
int size = avpicture_get_size(AV_PIX_FMT_BGR24, pCodecCtx->width, pCodecCtx->height);
out_bufferRGB = new uint8_t[size];
avpicture_fill((AVPicture *)pFrameRGB, out_bufferRGB, AV_PIX_FMT_BGR24, pCodecCtx->width, pCodecCtx->height);
//最后进行转换
sws_scale(colorContext, pAvFrame->data, pAvFrame->linesize, 0, pCodecCtx->height, pFrameRGB->data, pFrameRGB->linesize);
av_frame_unref(pAvFrame);
av_frame_unref(pFrameRGB);
av_frame_free(&pFrameRGB);
av_frame_free(&pAvFrame);
av_free_packet(packet);
pFrameRGB = nullptr;
pAvFrame = nullptr;
packet = nullptr;
return decode_frame(out_bufferRGB, pCodecCtx->width, pCodecCtx->height);
}
}
bool AvCodecContainer::tryNextFrame()
{
//分配一个帧指针，指向解码后的原始帧
y_size = pCodecCtx->width * pCodecCtx->height;
//分配帧内存
packet = (AVPacket *)av_malloc(sizeof(AVPacket));
av_new_packet(packet, y_size);
int ret = av_read_frame(pFormatCtx, packet);
if (ret != 0)
{
av_free_packet(packet);
packet = nullptr;
}
return ret;
}
AvCodecContainer::AvCodecContainer()
{
}
AvCodecContainer::~AvCodecContainer()
{
} -
How to stop os.system() in Python ?
30 septembre 2015, par 吴雨羲I want to stop the cmd command after 12 seconds. How to stop it ? My program doesn’t work.
import multiprocessing
import os
import time
def process():
os.system('ffmpeg -i rtsp://218.204.223.237:554/live/1/66251FC11353191F/e7ooqwcfbqjoo80j.sdp -c copy dump.mp4')
def stop():
time.sleep(12)
if __name__ == '__main__':
p = multiprocessing.Process(target=process, args=())
s = multiprocessing.Process(target=stop, args=())
p.start()
s.start()
s.join()
p.terminate()I change my program follow Pedro’s suggusetion @Pedro Lobito ,but it still doesn`t work.
import shlex
import subprocess
import time
command_line = 'ffmpeg -i rtsp://218.204.223.237:554/live/1/66251FC11353191F/e7ooqwcfbqjoo80j.sdp -c copy dump.mp4'
proc = subprocess.Popen(shlex.split(command_line), shell=True)
print '1' * 50
time.sleep(2) # <-- sleep for 12''
print '2' * 50
proc.terminate() # <-- terminate the process
print '3' * 50And the result in CMD is
D:\wyx\workspace\python\ffrstp>python test1.py
11111111111111111111111111111111111111111111111111
ffmpeg version N-75563-g235381e Copyright (c) 2000-2015 the FFmpeg developers
built with gcc 4.9.3 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-l
ibilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enab
le-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --en
able-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --ena
ble-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc
--enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enabl
e-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --ena
ble-decklink --enable-zlib
libavutil 55. 2.100 / 55. 2.100
libavcodec 57. 3.100 / 57. 3.100
libavformat 57. 2.100 / 57. 2.100
libavdevice 57. 0.100 / 57. 0.100
libavfilter 6. 8.100 / 6. 8.100
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.100 / 2. 0.100
libpostproc 54. 0.100 / 54. 0.100
Input #0, rtsp, from 'rtsp://218.204.223.237:554/live/1/66251FC11353191F/e7ooqwc
fbqjoo80j.sdp':
Metadata:
title : RTSP Session
comment : Jabsco Stream(JCO-jy9757acx1eve7nm-a104aea23c1e17bbc776656
f5069bbf7)
Duration: N/A, start: 0.000000, bitrate: N/A
Stream #0:0: Video: mpeg4 (Simple Profile), yuv420p, 352x288 [SAR 1:1 DAR 11
:9], 10k tbr, 90k tbn, 10k tbc
[mp4 @ 00bad520] Codec for stream 0 does not use global headers but container fo
rmat requires global headers
Output #0, mp4, to 'dump.mp4':
Metadata:
title : RTSP Session
comment : Jabsco Stream(JCO-jy9757acx1eve7nm-a104aea23c1e17bbc776656
f5069bbf7)
encoder : Lavf57.2.100
Stream #0:0: Video: mpeg4 ( [0][0][0] / 0x0020), yuv420p, 352x288 [SAR 1:1 D
AR 11:9], q=2-31, 10k tbr, 90k tbn, 90k tbc
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
[mp4 @ 00bad520] pts has no value
[mp4 @ 00bad520] Non-monotonous DTS in output stream 0:0; previous: 0, current:
0; changing to 1. This may result in incorrect timestamps in the output file.
[mp4 @ 00bad520] Non-monotonous DTS in output stream 0:0; previous: 1, current:
0; changing to 2. This may result in incorrect timestamps in the output file.
frame= 30 fps=0.0 q=-1.0 size= 63kB time=00:00:02.33 bitrate= 220.4kbits/
frame= 36 fps= 31 q=-1.0 size= 68kB time=00:00:02.95 bitrate= 187.9kbits/
frame= 42 fps= 24 q=-1.0 size= 73kB time=00:00:03.52 bitrate= 169.6kbits/
frame= 47 fps= 20 q=-1.0 size= 90kB time=00:00:04.10 bitrate= 178.9kbits/
frame= 53 fps= 19 q=-1.0 size= 95kB time=00:00:04.63 bitrate= 167.2kbits/
22222222222222222222222222222222222222222222222222
33333333333333333333333333333333333333333333333333
D:\wyx\workspace\python\ffrstp>frame= 58 fps= 17 q=-1.0 size= 99kB time=0
frame= 64 fps= 16 q=-1.0 size= 104kB time=00:00:05.72 bitrate= 149.0kbits/
frame= 70 fps= 15 q=-1.0 size= 122kB time=00:00:06.36 bitrate= 156.7kbits/
frame= 76 fps= 15 q=-1.0 size= 127kB time=00:00:06.92 bitrate= 150.2kbits/
frame= 82 fps= 14 q=-1.0 size= 132kB time=00:00:07.55 bitrate= 143.2kbits/
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 7 packets
frame= 86 fps= 13 q=-1.0 size= 135kB time=00:00:07.95 bitrate= 139.5kbits/
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 3 packetsMaybe ffmpeg can reconnection. Can I stop it like ’Ctrl + C’ ?
When I press ’Ctrl+C’,the result is22222222222222222222222222222222222222222222222222
33333333333333333333333333333333333333333333333333
D:\wyx\workspace\python\ffrstp>frame= 58 fps= 17 q=-1.0 size= 99kB time=0
frame= 64 fps= 16 q=-1.0 size= 104kB time=00:00:05.72 bitrate= 149.0kbits/
frame= 70 fps= 15 q=-1.0 size= 122kB time=00:00:06.36 bitrate= 156.7kbits/
frame= 76 fps= 15 q=-1.0 size= 127kB time=00:00:06.92 bitrate= 150.2kbits/
frame= 82 fps= 14 q=-1.0 size= 132kB time=00:00:07.55 bitrate= 143.2kbits/
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 7 packets
frame= 86 fps= 13 q=-1.0 size= 135kB time=00:00:07.95 bitrate= 139.5kbits/
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 3 packets
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 1 packets
frame= 89 fps= 13 q=-1.0 size= 138kB time=00:00:08.35 bitrate= 135.3kbits/
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 1 packets
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 3 packets
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 5 packets
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 3 packets
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 1 packets
frame= 92 fps= 12 q=-1.0 size= 144kB time=00:00:09.15 bitrate= 128.7kbits/
frame= 93 fps= 11 q=-1.0 size= 145kB time=00:00:09.58 bitrate= 123.8kbits/
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 1 packets
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 2 packets
D:\wyx\workspace\python\ffrstp>[rtsp @ 00adb3e0] max delay reached. need to cons
ume packet
[NULL @ 00add8c0] RTP: missed 12 packets
frame= 96 fps= 11 q=-1.0 size= 148kB time=00:00:10.43 bitrate= 116.2kbits/
frame= 96 fps=9.2 q=-1.0 Lsize= 151kB time=00:00:10.43 bitrate= 118.3kbits
/s
video:148kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing o
verhead: 1.913398%
Exiting normally, received signal 2.
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