FFmpeg 및 C++로 mp4 비디오 파일을 만들려고하는데 결과적으로 깨진 파일 (Windows Player에서 "Can not play ... 0xc00d36c4")을 수신합니다. .h264 파일을 만들면 'ffplay'로 재생하고 CL을 통해 mp4로 변환 할 수 있습니다.C++ FFmpeg mp4 파일 만들기
는내 코드 : 프로그램의
int main() {
char *filename = "tmp.mp4";
AVOutputFormat *fmt;
AVFormatContext *fctx;
AVCodecContext *cctx;
AVStream *st;
av_register_all();
avcodec_register_all();
//auto detect the output format from the name
fmt = av_guess_format(NULL, filename, NULL);
if (!fmt) {
cout << "Error av_guess_format()" << endl; system("pause"); exit(1);
}
if (avformat_alloc_output_context2(&fctx, fmt, NULL, filename) < 0) {
cout << "Error avformat_alloc_output_context2()" << endl; system("pause"); exit(1);
}
//stream creation + parameters
st = avformat_new_stream(fctx, 0);
if (!st) {
cout << "Error avformat_new_stream()" << endl; system("pause"); exit(1);
}
st->codecpar->codec_id = fmt->video_codec;
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
st->codecpar->width = 352;
st->codecpar->height = 288;
st->time_base.num = 1;
st->time_base.den = 25;
AVCodec *pCodec = avcodec_find_encoder(st->codecpar->codec_id);
if (!pCodec) {
cout << "Error avcodec_find_encoder()" << endl; system("pause"); exit(1);
}
cctx = avcodec_alloc_context3(pCodec);
if (!cctx) {
cout << "Error avcodec_alloc_context3()" << endl; system("pause"); exit(1);
}
avcodec_parameters_to_context(cctx, st->codecpar);
cctx->bit_rate = 400000;
cctx->width = 352;
cctx->height = 288;
cctx->time_base.num = 1;
cctx->time_base.den = 25;
cctx->gop_size = 12;
cctx->pix_fmt = AV_PIX_FMT_YUV420P;
if (st->codecpar->codec_id == AV_CODEC_ID_H264) {
av_opt_set(cctx->priv_data, "preset", "ultrafast", 0);
}
if (fctx->oformat->flags & AVFMT_GLOBALHEADER) {
cctx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
}
avcodec_parameters_from_context(st->codecpar, cctx);
av_dump_format(fctx, 0, filename, 1);
//OPEN FILE + WRITE HEADER
if (avcodec_open2(cctx, pCodec, NULL) < 0) {
cout << "Error avcodec_open2()" << endl; system("pause"); exit(1);
}
if (!(fmt->flags & AVFMT_NOFILE)) {
if (avio_open(&fctx->pb, filename, AVIO_FLAG_WRITE) < 0) {
cout << "Error avio_open()" << endl; system("pause"); exit(1);
}
}
if (avformat_write_header(fctx, NULL) < 0) {
cout << "Error avformat_write_header()" << endl; system("pause"); exit(1);
}
//CREATE DUMMY VIDEO
AVFrame *frame = av_frame_alloc();
frame->format = cctx->pix_fmt;
frame->width = cctx->width;
frame->height = cctx->height;
av_image_alloc(frame->data, frame->linesize, cctx->width, cctx->height, cctx->pix_fmt, 32);
AVPacket pkt;
double video_pts = 0;
for (int i = 0; i < 50; i++) {
video_pts = (double)cctx->time_base.num/cctx->time_base.den * 90 * i;
for (int y = 0; y < cctx->height; y++) {
for (int x = 0; x < cctx->width; x++) {
frame->data[0][y * frame->linesize[0] + x] = x + y + i * 3;
if (y < cctx->height/2 && x < cctx->width/2) {
/* Cb and Cr */
frame->data[1][y * frame->linesize[1] + x] = 128 + y + i * 2;
frame->data[2][y * frame->linesize[2] + x] = 64 + x + i * 5;
}
}
}
av_init_packet(&pkt);
pkt.flags |= AV_PKT_FLAG_KEY;
pkt.pts = frame->pts = video_pts;
pkt.data = NULL;
pkt.size = 0;
pkt.stream_index = st->index;
if (avcodec_send_frame(cctx, frame) < 0) {
cout << "Error avcodec_send_frame()" << endl; system("pause"); exit(1);
}
if (avcodec_receive_packet(cctx, &pkt) == 0) {
//cout << "Write frame " << to_string((int) pkt.pts) << endl;
av_interleaved_write_frame(fctx, &pkt);
av_packet_unref(&pkt);
}
}
//DELAYED FRAMES
for (;;) {
avcodec_send_frame(cctx, NULL);
if (avcodec_receive_packet(cctx, &pkt) == 0) {
//cout << "-Write frame " << to_string((int)pkt.pts) << endl;
av_interleaved_write_frame(fctx, &pkt);
av_packet_unref(&pkt);
}
else {
break;
}
}
//FINISH
av_write_trailer(fctx);
if (!(fmt->flags & AVFMT_NOFILE)) {
if (avio_close(fctx->pb) < 0) {
cout << "Error avio_close()" << endl; system("pause"); exit(1);
}
}
av_frame_free(&frame);
avcodec_free_context(&cctx);
avformat_free_context(fctx);
system("pause");
return 0;
}
출력 : 나는 'ffplay'로 MP4 파일을 재생하려고 경우
Output #0, mp4, to 'tmp.mp4':
Stream #0:0: Video: h264, yuv420p, 352x288, q=2-31, 400 kb/s, 25 tbn
[libx264 @ 0000021c4a995ba0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0000021c4a995ba0] profile Constrained Baseline, level 2.0
[libx264 @ 0000021c4a995ba0] 264 - core 152 r2851 ba24899 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=12 keyint_min=1 scenecut=0 intra_refresh=0 rc=abr mbtree=0 bitrate=400 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
[libx264 @ 0000021c4a995ba0] frame I:5 Avg QP: 7.03 size: 9318
[libx264 @ 0000021c4a995ba0] frame P:45 Avg QP: 4.53 size: 4258
[libx264 @ 0000021c4a995ba0] mb I I16..4: 100.0% 0.0% 0.0%
[libx264 @ 0000021c4a995ba0] mb P I16..4: 0.0% 0.0% 0.0% P16..4: 100.0% 0.0% 0.0% 0.0% 0.0% skip: 0.0%
[libx264 @ 0000021c4a995ba0] final ratefactor: 9.11
[libx264 @ 0000021c4a995ba0] coded y,uvDC,uvAC intra: 18.9% 21.8% 14.5% inter: 7.8% 100.0% 15.5%
[libx264 @ 0000021c4a995ba0] i16 v,h,dc,p: 4% 5% 5% 86%
[libx264 @ 0000021c4a995ba0] i8c dc,h,v,p: 2% 9% 6% 82%
[libx264 @ 0000021c4a995ba0] kb/s:264.68
그것은 인쇄 : 나는했습니다
[mov,mp4,m4a,3gp,3g2,mj2 @ 00000000026bf900] Could not find codec parameters for stream 0 (Video: h264 (avc1/0x31637661), none, 352x288, 138953 kb/s): unspecified pixel format
[h264 @ 00000000006c6ae0] non-existing PPS 0 referenced
[h264 @ 00000000006c6ae0] decode_slice_header error
[h264 @ 00000000006c6ae0] no frame!
문제를 발견하지 못한 채 많은 시간을 보냈는데, 그 이유는 무엇일까요?
감사합니다.
어떻게 마지막으로 코드를 수정 했습니까? – ar2015
@ ar2015 답변을 살펴보면 내 솔루션을 게시했습니다. MP4 컨테이너에 직접 쓸 수없는 것 같아서 먼저 h264를 만든 다음 mp4로 다시 변환했습니다. –