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The Great Big Beautiful Tomorrow
28 octobre 2011, par
Mis à jour : Octobre 2011
Langue : English
Type : Texte
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Blog series part 1 : How to use Matomo to increase customer acquisitions for your business
2 septembre 2020, par Joselyn Khor — Analytics Tips, Marketing -
converting images to mp4 using ffmpeg on iphone
29 novembre 2011, par user633901Up till now, i can create mpeg1 but with no luck for mp4.Maybe we can talk and share information.Someone told me that i have to set some flags for using mp4.But i am stuck at using it...
following is the working code :
av_register_all();
printf("Video encoding\n");
/// find the mpeg video encoder
//codec=avcodec_find_encoder(CODEC_ID_MPEG1VIDEO);
codec = avcodec_find_encoder(CODEC_ID_MPEG4);
if (!codec) {
fprintf(stderr, "codec not found\n");
exit(1);
}
c = avcodec_alloc_context();
picture = avcodec_alloc_frame();
// put sample parameters
c->bit_rate = 400000;
/// resolution must be a multiple of two
c->width = 240;
c->height = 320;
//c->codec_id = fmt->video_codec;
//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; // PIX_FMT_YUV420P
if (avcodec_open(c, codec) < 0) {
fprintf(stderr, "could not open codec\n");
exit(1);
}
f = fopen([[NSHomeDirectory() stringByAppendingPathComponent:@"test.mp4"] UTF8String], "wb");
if (!f) {
fprintf(stderr, "could not open %s\n",[@"test.mp4" UTF8String]);
exit(1);
}
// alloc image and output buffer
outbuf_size = 100000;
outbuf = malloc(outbuf_size);
size = c->width * c->height;
#pragma mark -
AVFrame* outpic = avcodec_alloc_frame();
int nbytes = avpicture_get_size(PIX_FMT_YUV420P, c->width, c->height); //this is half size of numbytes.
//create buffer for the output image
uint8_t* outbuffer = (uint8_t*)av_malloc(nbytes);
#pragma mark -
for(k=0;k<1;k++) {
for(i=0;i<25;i++) {
fflush(stdout);
int numBytes = avpicture_get_size(PIX_FMT_RGBA, c->width, c->height);
uint8_t *buffer = (uint8_t *)av_malloc(numBytes*sizeof(uint8_t));
UIImage *image = [UIImage imageNamed:[NSString stringWithFormat:@"%d.png", i+1]];
CGImageRef newCgImage = [image CGImage];
CGDataProviderRef dataProvider = CGImageGetDataProvider(newCgImage);
CFDataRef bitmapData = CGDataProviderCopyData(dataProvider);
buffer = (uint8_t *)CFDataGetBytePtr(bitmapData);
///////////////////////////
//outbuffer=(uint8_t *)CFDataGetBytePtr(bitmapData);
//////////////////////////
avpicture_fill((AVPicture*)picture, buffer, PIX_FMT_RGBA, c->width, c->height);
avpicture_fill((AVPicture*)outpic, outbuffer, PIX_FMT_YUV420P, c->width, c->height);//does not have image data.
struct SwsContext* fooContext = sws_getContext(c->width, c->height,
PIX_FMT_RGBA,
c->width, c->height,
PIX_FMT_YUV420P,
SWS_FAST_BILINEAR, NULL, NULL, NULL);
//perform the conversion
sws_scale(fooContext, picture->data, picture->linesize, 0, c->height, outpic->data, outpic->linesize);
// Here is where I try to convert to YUV
// encode the image
out_size = avcodec_encode_video(c, outbuf, outbuf_size, outpic);
printf("encoding frame %3d (size=%5d)\n", i, out_size);
fwrite(outbuf, 1, out_size, f);
free(buffer);
buffer = NULL;
}
// 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, outbuf_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(picture_buf);
free(outbuf);
avcodec_close(c);
av_free(c);
av_free(picture);
//av_free(outpic);
printf("\n");my msn:hieeli@hotmail.com
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ffmpeg streaming from local drive to RTSP gives black video in some streaming services :(
27 avril 2022, par John RThis question if about ffmpeg flags or options.....


example, this ffmpeg command work perfectly well in mux.com but NOT in livepeer.com


ffmpeg -re -i 1.webm -threads 4 
-c:v libx264 -movflags +dash -preset fast 
-tune zerolatency -pix_fmt yuv420p -c:a aac 
-b:a 192k -ac 2 -profile:v high -b:v 1369k 
-r 30 -g 60 -bufsize 969k 
-f flv "rtmp://rtmp.livepeer.com/live/streamkey"





QUESTION : I'm I missing something ???


I try
-f mpegts
=> I get black video in the stream dasboard

I'm stuck...