Hi, everyone.
I'm trying to use libavcodec to encode a flv video. Following code is a
sample code to generate a mpeg video, it works well. But after replacing
the codec ID with AV_CODEC_ID_FLV1, the generated video file cannot be
played.
I opened the generated file and checked the first 4 bytes (previous tag
size), but it's not 0. I'm curious whether converted packet is valid flv
packet?
Any suggestion is appreciated.
(Code)
|void simpleEncode(){
AVCodec *codec = avcodec_find_encoder(AV_CODEC_ID_MPEG1VIDEO);
AVCodecContext *ctx = avcodec_alloc_context3(codec);
ctx->bit_rate = 400000;
ctx->width = 352;
ctx->height = 288;
AVRational time_base = {1,25};
ctx->time_base = time_base;
ctx->gop_size = 10;
ctx->pix_fmt = AV_PIX_FMT_YUV420P;
avcodec_open2(ctx, codec, NULL);
AVFrame *frame = av_frame_alloc();
av_image_alloc(frame->data, frame->linesize, ctx->width, ctx->height,
ctx->pix_fmt, 32);
frame->format = ctx->pix_fmt;
frame->height = ctx->height;
frame->width = ctx->width;
AVPacket pkt;
int got_output;
FILE *f = fopen("test.mpg", "wb");
for(int i=0; i<25; i++){
av_init_packet(&pkt);
pkt.data = NULL;
pkt.size = 0;
for(int w=0; w<ctx->width; w++){
for(int h=0; h<ctx->height; h++){
frame->data[0][h*frame->linesize[0]+w]=i*10;
}
}
for(int w=0; w<ctx->width/2; w++){
for(int h=0; h<ctx->height/2; h++){
frame->data[1][h*frame->linesize[1]+w]=i*10;
frame->data[2][h*frame->linesize[2]+w]=i*10;
}
}
frame->pts=i;
avcodec_encode_video2(ctx, &pkt, frame, &got_output);
fwrite(pkt.data, 1, pkt.size, f);
}
}|
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