C ++ FFmpeg创建mp4文件
我试图使用FFmpeg和C ++创建mp4视频文件，但结果我收到了损坏的文件（Windows播放器显示＆＃34;无法播放... 0xc00d36c4＆＃34;）。如果我创建.h264文件，可以使用＆fffplay＆＃39;并通过CL成功转换为mp4。
我的代码：
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;
}
节目输出：
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
如果我尝试用＆fffplay＆＃39;播放mp4文件它打印：
[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!
我花了很多时间没有找到问题的成功，这可能是什么原因？
感谢您的帮助！
5 个答案:
答案 0 :(得分：3)
工作解决方案：
on run argv
set arg1 to (item 1 of argv)
set arg2 to (item 2 of argv)
testFunc(arg1,arg2)
sshxxx(arg1,arg2)
end run
on sshxxx(target,password)
tell application "iTerm"
reopen
activate
tell the current window
create tab with default profile
tell the current tab
tell the current session
write text "clear"
write text "logfin the gate way host"
delay 0.2
repeat until "xxxxx" is in contents
end repeat
write text "clear"
set targetText to "ssh " & target
write text targetText
repeat until "password" is in contents
end repeat
write text password
end tell
end tell
end tell
end tell
end sshxxx
标题文件：
#include "VideoCapture.h"
#define VIDEO_TMP_FILE "tmp.h264"
#define FINAL_FILE_NAME "record.mp4"
using namespace std;
void VideoCapture::Init(int width, int height, int fpsrate, int bitrate) {
fps = fpsrate;
int err;
if (!(oformat = av_guess_format(NULL, VIDEO_TMP_FILE, NULL))) {
Debug("Failed to define output format", 0);
return;
}
if ((err = avformat_alloc_output_context2(&ofctx, oformat, NULL, VIDEO_TMP_FILE) < 0)) {
Debug("Failed to allocate output context", err);
Free();
return;
}
if (!(codec = avcodec_find_encoder(oformat->video_codec))) {
Debug("Failed to find encoder", 0);
Free();
return;
}
if (!(videoStream = avformat_new_stream(ofctx, codec))) {
Debug("Failed to create new stream", 0);
Free();
return;
}
if (!(cctx = avcodec_alloc_context3(codec))) {
Debug("Failed to allocate codec context", 0);
Free();
return;
}
videoStream->codecpar->codec_id = oformat->video_codec;
videoStream->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
videoStream->codecpar->width = width;
videoStream->codecpar->height = height;
videoStream->codecpar->format = AV_PIX_FMT_YUV420P;
videoStream->codecpar->bit_rate = bitrate * 1000;
videoStream->time_base = { 1, fps };
avcodec_parameters_to_context(cctx, videoStream->codecpar);
cctx->time_base = { 1, fps };
cctx->max_b_frames = 2;
cctx->gop_size = 12;
if (videoStream->codecpar->codec_id == AV_CODEC_ID_H264) {
av_opt_set(cctx, "preset", "ultrafast", 0);
}
if (ofctx->oformat->flags & AVFMT_GLOBALHEADER) {
cctx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
}
avcodec_parameters_from_context(videoStream->codecpar, cctx);
if ((err = avcodec_open2(cctx, codec, NULL)) < 0) {
Debug("Failed to open codec", err);
Free();
return;
}
if (!(oformat->flags & AVFMT_NOFILE)) {
if ((err = avio_open(&ofctx->pb, VIDEO_TMP_FILE, AVIO_FLAG_WRITE)) < 0) {
Debug("Failed to open file", err);
Free();
return;
}
}
if ((err = avformat_write_header(ofctx, NULL)) < 0) {
Debug("Failed to write header", err);
Free();
return;
}
av_dump_format(ofctx, 0, VIDEO_TMP_FILE, 1);
}
void VideoCapture::AddFrame(uint8_t *data) {
int err;
if (!videoFrame) {
videoFrame = av_frame_alloc();
videoFrame->format = AV_PIX_FMT_YUV420P;
videoFrame->width = cctx->width;
videoFrame->height = cctx->height;
if ((err = av_frame_get_buffer(videoFrame, 32)) < 0) {
Debug("Failed to allocate picture", err);
return;
}
}
if (!swsCtx) {
swsCtx = sws_getContext(cctx->width, cctx->height, AV_PIX_FMT_RGB24, cctx->width, cctx->height, AV_PIX_FMT_YUV420P, SWS_BICUBIC, 0, 0, 0);
}
int inLinesize[1] = { 3 * cctx->width };
// From RGB to YUV
sws_scale(swsCtx, (const uint8_t * const *)&data, inLinesize, 0, cctx->height, videoFrame->data, videoFrame->linesize);
videoFrame->pts = frameCounter++;
if ((err = avcodec_send_frame(cctx, videoFrame)) < 0) {
Debug("Failed to send frame", err);
return;
}
AVPacket pkt;
av_init_packet(&pkt);
pkt.data = NULL;
pkt.size = 0;
if (avcodec_receive_packet(cctx, &pkt) == 0) {
pkt.flags |= AV_PKT_FLAG_KEY;
av_interleaved_write_frame(ofctx, &pkt);
av_packet_unref(&pkt);
}
}
void VideoCapture::Finish() {
//DELAYED FRAMES
AVPacket pkt;
av_init_packet(&pkt);
pkt.data = NULL;
pkt.size = 0;
for (;;) {
avcodec_send_frame(cctx, NULL);
if (avcodec_receive_packet(cctx, &pkt) == 0) {
av_interleaved_write_frame(ofctx, &pkt);
av_packet_unref(&pkt);
}
else {
break;
}
}
av_write_trailer(ofctx);
if (!(oformat->flags & AVFMT_NOFILE)) {
int err = avio_close(ofctx->pb);
if (err < 0) {
Debug("Failed to close file", err);
}
}
Free();
Remux();
}
void VideoCapture::Free() {
if (videoFrame) {
av_frame_free(&videoFrame);
}
if (cctx) {
avcodec_free_context(&cctx);
}
if (ofctx) {
avformat_free_context(ofctx);
}
if (swsCtx) {
sws_freeContext(swsCtx);
}
}
void VideoCapture::Remux() {
AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL;
int err;
if ((err = avformat_open_input(&ifmt_ctx, VIDEO_TMP_FILE, 0, 0)) < 0) {
Debug("Failed to open input file for remuxing", err);
goto end;
}
if ((err = avformat_find_stream_info(ifmt_ctx, 0)) < 0) {
Debug("Failed to retrieve input stream information", err);
goto end;
}
if ((err = avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, FINAL_FILE_NAME))) {
Debug("Failed to allocate output context", err);
goto end;
}
AVStream *inVideoStream = ifmt_ctx->streams[0];
AVStream *outVideoStream = avformat_new_stream(ofmt_ctx, NULL);
if (!outVideoStream) {
Debug("Failed to allocate output video stream", 0);
goto end;
}
outVideoStream->time_base = { 1, fps };
avcodec_parameters_copy(outVideoStream->codecpar, inVideoStream->codecpar);
outVideoStream->codecpar->codec_tag = 0;
if (!(ofmt_ctx->oformat->flags & AVFMT_NOFILE)) {
if ((err = avio_open(&ofmt_ctx->pb, FINAL_FILE_NAME, AVIO_FLAG_WRITE)) < 0) {
Debug("Failed to open output file", err);
goto end;
}
}
if ((err = avformat_write_header(ofmt_ctx, 0)) < 0) {
Debug("Failed to write header to output file", err);
goto end;
}
AVPacket videoPkt;
int ts = 0;
while (true) {
if ((err = av_read_frame(ifmt_ctx, &videoPkt)) < 0) {
break;
}
videoPkt.stream_index = outVideoStream->index;
videoPkt.pts = ts;
videoPkt.dts = ts;
videoPkt.duration = av_rescale_q(videoPkt.duration, inVideoStream->time_base, outVideoStream->time_base);
ts += videoPkt.duration;
videoPkt.pos = -1;
if ((err = av_interleaved_write_frame(ofmt_ctx, &videoPkt)) < 0) {
Debug("Failed to mux packet", err);
av_packet_unref(&videoPkt);
break;
}
av_packet_unref(&videoPkt);
}
av_write_trailer(ofmt_ctx);
end:
if (ifmt_ctx) {
avformat_close_input(&ifmt_ctx);
}
if (ofmt_ctx && !(ofmt_ctx->oformat->flags & AVFMT_NOFILE)) {
avio_closep(&ofmt_ctx->pb);
}
if (ofmt_ctx) {
avformat_free_context(ofmt_ctx);
}
}
答案 1 :(得分：2)
当前解决方案是错误的。充其量是一种解决方法。它首先将视频编码为h264，然后将其重新混合为mp4。没必要。
真正的解决方案是删除：
cctx->标志| = AV_CODEC_FLAG_GLOBAL_HEADER;
这是我的完整解决方案：
var a = ["2018-12-05 17:10:32", "2018-12-05 17:10:32", "2018-12-05 17:10:32", "2018-12-05 17:10:32", "2018-12-05 17:10:32", "2018-12-05 17:10:32", "2018-12-05 17:10:32", "2018-12-05 17:10:32", "2018-12-05 17:10:32", "2018-12-05 17:10:32", "2018-12-05 17:10:32"];
a.forEach((e) => {
var date = new Date(e);
console.log(date)
})这是我调试问题的方法：
我首先从提问者的解决方案开始。我比较了通过编码和重新混合生成的数据包，
在第一次编码期间，第一个数据包丢失了标头：
重新混合时，第一个数据包具有标头：
然后我注意到了AV_CODEC_FLAG_GLOBAL_HEADER。从其名称来看，它似乎写了一个全局头，并剥离了数据包头。
所以我删除了它，一切正常。我已经详细说明了我的发现here。
代码在此处与makefile：https://github.com/shi-yan/videosamples
答案 2 :(得分：1)
我遇到了完全相同的问题（错误0xc00d36c4）。这个主题和答复帮助我解决了我的问题。解决方案仅添加以下代码：
if (ofctx->oformat->flags & AVFMT_GLOBALHEADER) {
cctx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
}
答案 3 :(得分：0)
您需要填充编解码器上下文extradata和extradata_size字段。
答案 4 :(得分：0)
if (fctx->oformat->flags & AVFMT_GLOBALHEADER) {
cctx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
}
//avcodec_parameters_from_context(st->codecpar, cctx); //cut this line
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);
}
avcodec_parameters_from_context(st->codecpar, cctx); //move to here
if (!(fmt->flags & AVFMT_NOFILE)) {
if (avio_open(&fctx->pb, filename, AVIO_FLAG_WRITE) < 0) {
cout << "Error avio_open()" << endl; system("pause"); exit(1);
}
}
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