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Revolution of Open-source and film making towards open film making
6 octobre 2011, par
Mis à jour : Juillet 2013
Langue : English
Type : Texte
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Sur d’autres sites (5484)
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The C++11 Thread Timer is not working
26 août 2017, par GathrosI’m trying to make a video player using SDL2 and FFmpeg API. The video is being decoded and I can display an image on screen. I can also play audio but I not doing that (I know it works, I’ve tried it).
My problem is I can’t update the image when it should be. I’m able to get the timestamps and work out the delay then send it to a thread, where it should call an window update when the time has elapsed. But all that happens is the images flash on the screen with no delay. I have even set the delay to 1 second and the images still flash, after there being 1 second of a blank window.
Here is my code :
extern "C"{
//FFmpeg libraries
#include <libavcodec></libavcodec>avcodec.h>
#include <libavformat></libavformat>avformat.h>
#include <libswscale></libswscale>swscale.h>
//SDL2 libraries
#include <sdl2></sdl2>SDL.h>
}
// compatibility with newer API
#if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(55,28,1)
#define av_frame_alloc avcodec_alloc_frame
#define av_frame_free avcodec_free_frame
#endif
//C++ libraries
#include <cstdio>
#include <chrono>
#include <thread>
#include <atomic>
#include <mutex>
#include
typedef struct PacketQueue {
AVPacketList *first_pkt, *last_pkt;
std::mutex mutex;
std::condition_variable convar;
} PacketQueue;
std::atomic<bool> quitting, decoded;
std::atomic delay;
Uint32 Update_Window;
int packet_queue_put(PacketQueue *q, AVPacket *pkt){
AVPacketList *pkt1;
if(av_dup_packet(pkt) < 0){
return -1;
}
pkt1 = (AVPacketList*) av_malloc(sizeof(AVPacketList));
if(!pkt1){
return -1;
}
pkt1->pkt = *pkt;
pkt1->next = NULL;
std::lock_guard lock(q->mutex);
if (!q->last_pkt){
q->first_pkt = pkt1;
}else{
q->last_pkt->next = pkt1;
}
q->last_pkt = pkt1;
q->convar.notify_all();
return 0;
}
static int packet_queue_get(PacketQueue *q, AVPacket *pkt, int block){
AVPacketList *pkt1;
int ret;
std::unique_lock lk(q->mutex);
while(1){
if(quitting){
ret = -1;
break;
}
pkt1 = q->first_pkt;
if(pkt1){
q->first_pkt = pkt1->next;
if(!q->first_pkt){
q->last_pkt = NULL;
}
*pkt = pkt1->pkt;
av_free(pkt1);
ret = 1;
break;
}else if(decoded){
ret = 0;
quitting = true;
break;
}else if(block){
q->convar.wait_for(lk, std::chrono::microseconds(50));
}else {
ret = 0;
break;
}
}
return ret;
}
void UpdateEventQueue(){
SDL_Event event;
SDL_zero(event);
event.type = Update_Window;
SDL_PushEvent(&event);
}
void VideoTimerThreadFunc(){
UpdateEventQueue();
while(!quitting){
if(delay == 0){
std::this_thread::sleep_for(std::chrono::milliseconds(1));
}else {
std::this_thread::sleep_for(std::chrono::microseconds(delay));
UpdateEventQueue();
}
}
}
int main(int argc, char *argv[]){
AVFormatContext* FormatCtx = nullptr;
AVCodecContext* CodecCtxOrig = nullptr;
AVCodecContext* CodecCtx = nullptr;
AVCodec* Codec = nullptr;
int videoStream;
AVFrame* Frame = nullptr;
AVPacket packet;
struct SwsContext* SwsCtx = nullptr;
PacketQueue videoq;
int frameFinished;
int64_t last_pts = 0;
const AVRational ms = {1, 1000};
SDL_Event event;
SDL_Window* screen;
SDL_Renderer* renderer;
SDL_Texture* texture;
std::shared_ptr<uint8> yPlane, uPlane, vPlane;
int uvPitch;
if (argc != 2) {
fprintf(stderr, "Usage: %s <file>\n", argv[0]);
return -1;
}
// Register all formats and codecs
av_register_all();
// Initialise SDL2
if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)) {
fprintf(stderr, "Couldn't initialise SDL - %s\n", SDL_GetError());
return -1;
}
// Setting things up
quitting = false;
decoded = false;
delay = 0;
Update_Window = SDL_RegisterEvents(1);
memset(&videoq, 0, sizeof(PacketQueue));
// Open video file
if(avformat_open_input(&FormatCtx, argv[1], NULL, NULL) != 0){
fprintf(stderr, "Couldn't open file\n");
return -1; // Couldn't open file
}
// Retrieve stream information
if(avformat_find_stream_info(FormatCtx, NULL) < 0){
fprintf(stderr, "Couldn't find stream information\n");
// Close the video file
avformat_close_input(&FormatCtx);
return -1; // Couldn't find stream information
}
// Find the video stream
videoStream = av_find_best_stream(FormatCtx, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);
if(videoStream < 0){
fprintf(stderr, "Couldn't find video stream\n");
// Close the video file
avformat_close_input(&FormatCtx);
return -1; // Didn't find a video stream
}
// Get a pointer to the codec context for the video stream
CodecCtxOrig = FormatCtx->streams[videoStream]->codec;
// Find the decoder for the video stream
Codec = avcodec_find_decoder(CodecCtxOrig->codec_id);
if(Codec == NULL){
fprintf(stderr, "Unsupported codec\n");
// Close the codec
avcodec_close(CodecCtxOrig);
// Close the video file
avformat_close_input(&FormatCtx);
return -1; // Codec not found
}
// Copy context
CodecCtx = avcodec_alloc_context3(Codec);
if(avcodec_copy_context(CodecCtx, CodecCtxOrig) != 0){
fprintf(stderr, "Couldn't copy codec context");
// Close the codec
avcodec_close(CodecCtxOrig);
// Close the video file
avformat_close_input(&FormatCtx);
return -1; // Error copying codec context
}
// Open codec
if(avcodec_open2(CodecCtx, Codec, NULL) < 0){
fprintf(stderr, "Couldn't open codec\n");
// Close the codec
avcodec_close(CodecCtx);
avcodec_close(CodecCtxOrig);
// Close the video file
avformat_close_input(&FormatCtx);
return -1; // Could not open codec
}
// Allocate video frame
Frame = av_frame_alloc();
// Make a screen to put our video
screen = SDL_CreateWindow("Video Player", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, CodecCtx->width, CodecCtx->height, 0);
if(!screen){
fprintf(stderr, "SDL: could not create window - exiting\n");
quitting = true;
// Clean up SDL2
SDL_Quit();
// Free the YUV frame
av_frame_free(&Frame);
// Close the codec
avcodec_close(CodecCtx);
avcodec_close(CodecCtxOrig);
// Close the video file
avformat_close_input(&FormatCtx);
return -1;
}
renderer = SDL_CreateRenderer(screen, -1, 0);
if(!renderer){
fprintf(stderr, "SDL: could not create renderer - exiting\n");
quitting = true;
// Clean up SDL2
SDL_DestroyWindow(screen);
SDL_Quit();
// Free the YUV frame
av_frame_free(&Frame);
// Close the codec
avcodec_close(CodecCtx);
avcodec_close(CodecCtxOrig);
// Close the video file
avformat_close_input(&FormatCtx);
return -1;
}
// Allocate a place to put our YUV image on that screen
texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_YV12, SDL_TEXTUREACCESS_STREAMING, CodecCtx->width, CodecCtx->height);
if(!texture){
fprintf(stderr, "SDL: could not create texture - exiting\n");
quitting = true;
// Clean up SDL2
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(screen);
SDL_Quit();
// Free the YUV frame
av_frame_free(&Frame);
// Close the codec
avcodec_close(CodecCtx);
avcodec_close(CodecCtxOrig);
// Close the video file
avformat_close_input(&FormatCtx);
return -1;
}
// Initialise SWS context for software scaling
SwsCtx = sws_getContext(CodecCtx->width, CodecCtx->height, CodecCtx->pix_fmt,
CodecCtx->width, CodecCtx->height, PIX_FMT_YUV420P, SWS_BILINEAR, NULL, NULL, NULL);
if(!SwsCtx){
fprintf(stderr, "Couldn't create sws context\n");
quitting = true;
// Clean up SDL2
SDL_DestroyTexture(texture);
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(screen);
SDL_Quit();
// Free the YUV frame
av_frame_free(&Frame);
// Close the codec
avcodec_close(CodecCtx);
avcodec_close(CodecCtxOrig);
// Close the video file
avformat_close_input(&FormatCtx);
return -1;
}
// set up YV12 pixel array (12 bits per pixel)
yPlane = std::shared_ptr<uint8>((Uint8 *)::operator new (CodecCtx->width * CodecCtx->height, std::nothrow));
uPlane = std::shared_ptr<uint8>((Uint8 *)::operator new (CodecCtx->width * CodecCtx->height / 4, std::nothrow));
vPlane = std::shared_ptr<uint8>((Uint8 *)::operator new (CodecCtx->width * CodecCtx->height / 4, std::nothrow));
uvPitch = CodecCtx->width / 2;
if (!yPlane || !uPlane || !vPlane) {
fprintf(stderr, "Could not allocate pixel buffers - exiting\n");
quitting = true;
// Clean up SDL2
SDL_DestroyTexture(texture);
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(screen);
SDL_Quit();
// Free the YUV frame
av_frame_free(&Frame);
// Close the codec
avcodec_close(CodecCtx);
avcodec_close(CodecCtxOrig);
// Close the video file
avformat_close_input(&FormatCtx);
return -1;
}
std::thread VideoTimer (VideoTimerThreadFunc);
while (!quitting) {
// Check for more packets
if(av_read_frame(FormatCtx, &packet) >= 0){
// Check what stream it belongs to
if (packet.stream_index == videoStream) {
packet_queue_put(&videoq, &packet);
}else{
// Free the packet that was allocated by av_read_frame
av_free_packet(&packet);
}
}else {
decoded = true;
}
SDL_PollEvent(&event);
if(event.type == Update_Window){
// Getting packet
if(packet_queue_get(&videoq, &packet, 0)){
// Decode video frame
avcodec_decode_video2(CodecCtx, Frame, &frameFinished, &packet);
// Did we get a video frame?
if (frameFinished) {
AVPicture pict;
pict.data[0] = yPlane.get();
pict.data[1] = uPlane.get();
pict.data[2] = vPlane.get();
pict.linesize[0] = CodecCtx->width;
pict.linesize[1] = uvPitch;
pict.linesize[2] = uvPitch;
// Convert the image into YUV format that SDL uses
sws_scale(SwsCtx, (uint8_t const * const *) Frame->data, Frame->linesize, 0, CodecCtx->height, pict.data, pict.linesize);
SDL_UpdateYUVTexture(texture, NULL, yPlane.get(), CodecCtx->width, uPlane.get(), uvPitch, vPlane.get(), uvPitch);
SDL_RenderClear(renderer);
SDL_RenderCopy(renderer, texture, NULL, NULL);
SDL_RenderPresent(renderer);
// Calculating delay
delay = av_rescale_q(packet.dts, CodecCtx->time_base, ms) - last_pts;
last_pts = av_rescale_q(packet.dts, CodecCtx->time_base, ms);
}else{
//UpdateEventQueue();
delay = 1;
}
// Free the packet that was allocated by av_read_frame
av_free_packet(&packet);
}else{
//UpdateEventQueue();
}
}
switch (event.type) {
case SDL_QUIT:
quitting = true;
break;
default:
break;
}
}
VideoTimer.join();
//SDL2 clean up
SDL_DestroyTexture(texture);
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(screen);
SDL_Quit();
// Free the YUV frame
av_frame_free(&Frame);
// Free Sws
sws_freeContext(SwsCtx);
// Close the codec
avcodec_close(CodecCtx);
avcodec_close(CodecCtxOrig);
// Close the video file
avformat_close_input(&FormatCtx);
return 0;
}
</uint8></uint8></uint8></file></uint8></bool></mutex></atomic></thread></chrono></cstdio> -
PHP and FFmpeg : works on terminal but ffmpeg error when in shell_exec
25 janvier 2014, par user2128983I'm in front of a problem I can't solve !
I try to convert videos using the
ffmpegtool. When I paste the command on the server terminal (ssh root), it works fine. But, when I try in my PHP script usingshell_exec, it returns the error "Error while opening encoder ...".Here is the command I use :
ffmpeg -y -i VIDEOIN.mov -preset medium -strict -2 -c:v libx264 -b:v 1000k -pass 1 -f mp4 VIDEOOUT.mp4 null 1>logfile.txt 2>&1 &And my PHP script :
$dir = 'videos/'.$uuid;
$out = $dir.'video.mp4';
$log = $dir.'transcoding_log.txt';
$preset = 'medium';
$bitrate = 1000;
$cmd = "ffmpeg -y -i ".$in." -preset ".$preset." -strict -2 -c:v libx264 -b:v ".$bitrate."k -pass 1 -f mp4 ".$out." null 1>".$log." 2>&1 &";
@file_put_contents($dir.'cmd.log', $cmd); // to debug
shell_exec($cmd);Here is the log file created in the PHP script :
ffmpeg version 1.0.8 Copyright (c) 2000-2013 the FFmpeg developers
built on Sep 12 2013 11:57:09 with gcc 4.7 (Debian 4.7.2-5)
configuration: --prefix=/usr --extra-cflags='-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security ' --extra-ldflags='-Wl,-z,relro' --cc='ccache cc' --enable-shared --enable-libmp3lame --enable-gpl --enable-nonfree --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-x11grab --enable-libgsm --enable-libtheora --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libspeex --enable-nonfree --disable-stripping --enable-libvpx --enable-libschroedinger --disable-encoder=libschroedinger --enable-version3 --enable-libopenjpeg --enable-librtmp --enable-avfilter --enable-libfreetype --enable-libvo-aacenc --disable-decoder=amrnb --enable-libvo-amrwbenc --enable-libaacplus --libdir=/usr/lib/x86_64-linux-gnu --disable-vda --enable-libbluray --enable-libcdio --enable-gnutls --enable-frei0r --enable-openssl --enable-libass --enable-libopus --enable-fontconfig --enable-libfdk-aac --enable-libdc1394 --disable-altivec --dis libavutil 51. 73.101 / 51. 73.101
libavcodec 54. 59.100 / 54. 59.100
libavformat 54. 29.104 / 54. 29.104
libavdevice 54. 2.101 / 54. 2.101
libavfilter 3. 17.100 / 3. 17.100
libswscale 2. 1.101 / 2. 1.101
libswresample 0. 15.100 / 0. 15.100
libpostproc 52. 0.100 / 52. 0.100
Input #0, matroska,webm, from 'videos/18352678af96ecb5/origin.webm':
Metadata:
creation_time : 2010-05-20 08:21:12
Duration: 00:00:32.48, start: 0.000000, bitrate: 533 kb/s
Stream #0:0(eng): Video: vp8, yuv420p, 640x360, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 1k tbn, 1k tbc (default)
Stream #0:1(eng): Audio: vorbis, 44100 Hz, mono, s16 (default)
[libx264 @ 0x19c05a0] using SAR=1/1
[libx264 @ 0x19c05a0] using cpu capabilities: MMX2 SSE2Fast SSEMisalign LZCNT
[libx264 @ 0x19c05a0] ratecontrol_init: can't open stats file
Output #0, mp4, to 'videos/18352678af96ecb5/video.mp4':
Stream #0:0(eng): Video: h264, yuv420p, 640x360 [SAR 1:1 DAR 16:9], q=-1--1, pass 1, 90k tbn, 25 tbc (default)
Stream #0:1(eng): Audio: none, 44100 Hz, mono, s16, 128 kb/s (default)
Stream mapping:
Stream #0:0 -> #0:0 (vp8 -> libx264)
Stream #0:1 -> #0:1 (vorbis -> libfaac)
Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or heightEDIT 1 :
I compiled ffmpeg with the latest revision but the problem still occurs.
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Unable to mux two live streams from webcam using ffmpeg in linux
24 octobre 2013, par user2902884We are trying to multiplex two live streams from webcams into an output file using ffmpeg in linux as follows,
fmpeg -i "http://10.41.2.57:8090/webcam.asf" -i "http://10.41.2.49:8090/webcam.asf" -map 0:0 -map 1:0 -t 60 "/home/../MuxLiveStream1.flv"ffmpeg stops responding at after a while and the console shows the following output,
FFmpeg version SVN-r0.5.9-4:0.5.9-0ubuntu0.10.04.3, Copyright (c) 2000-2009 Fabrice Bellard, et al.
configuration: --extra-version=4:0.5.9-0ubuntu0.10.04.3 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --disable-stripping --disable-vhook --enable-runtime-cpudetect --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --enable-shared --disable-static
libavutil 49.15. 0 / 49.15. 0
libavcodec 52.20. 1 / 52.20. 1
libavformat 52.31. 0 / 52.31. 0
libavdevice 52. 1. 0 / 52. 1. 0
libavfilter 0. 4. 0 / 0. 4. 0
libswscale 0. 7. 1 / 0. 7. 1
libpostproc 51. 2. 0 / 51. 2. 0
built on Jan 24 2013 19:42:59, gcc: 4.4.3
Seems stream 0 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 2.00 (2/1)
Input #0, flv, from 'http:10.41.2.154:8090/webcam.flv':
Duration: 00:00:00.00, start: 1587016.579000, bitrate: 200 kb/s
Stream #0.0: Video: flv, yuv420p, 320x240, 200 kb/s, 2 tbr, 1k tbn, 1k tbc
Seems stream 0 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 2.00 (2/1)
Input #1, flv, from 'http:10.41.2.57:8090/webcam.flv':
Duration: 00:00:00.00, start: 1587230.806000, bitrate: 200 kb/s
Stream #1.0: Video: flv, yuv420p, 320x240, 200 kb/s, 2 tbr, 1k tbn, 1k tbc
Number of stream maps must match number of output streamsIs there a mistake in the command or is there anything else that needs to be done ?
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