我试图将一个可以使用ffmpeg 3.3.3 API从其构建视频的类放在一起。我一直在努力找到一个很好的例子,因为这些例子似乎仍然使用了不推荐使用的函数,所以我试图使用头文件中的文档来修补它,并通过引用几个似乎正在使用的github回购新版本。当使用av_interleaved_write_frame而不是avio_write时出现“moov atom not found”
如果我使用av_interleaved_write_frame写编码的分组到输出然后ffprobe输出以下:
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000000002760120] moov atom not found0
X:\Diagnostics.mp4: Invalid data found when processing input
ffplay是无法发挥使用该方法生成的文件。
如果我而不是将其交换出去调用avio_write,ffprobe而不是输出:
Input #0, h264, from 'X:\Diagnostics.mp4':
Duration: N/A, bitrate: N/A
Stream #0:0: Video: h264 (Main), yuv420p(progressive), 672x380 [SAR 1:1 DAR 168:95], 25 fps, 25 tbr, 1200k tbn, 50 tbc
ffplay可以大多播放此文件,直到接近尾声得到,当它输出:
Input #0, h264, from 'X:\Diagnostics.mp4': 0KB sq= 0B f=0/0
Duration: N/A, bitrate: N/A
Stream #0:0: Video: h264 (Main), yuv420p(progressive), 672x380 [SAR 1:1 DAR 168:95], 25 fps, 25 tbr, 1200k tbn, 50 tbc
[h264 @ 000000000254ef80] error while decoding MB 31 22, bytestream -65
[h264 @ 000000000254ef80] concealing 102 DC, 102 AC, 102 MV errors in I frame
nan M-V: nan fd= 1 aq= 0KB vq= 0KB sq= 0B f=0/0
VLC无法从任何一种方法播放文件。第二种方法的文件显示一个黑色框架,然后隐藏视频输出。第一个不显示任何东西。他们都没有提供视频持续时间。
有没有人有任何想法这里发生了什么?我认为我的解决方案正在接近工作,因为我获得了大量有效帧。
代码:
void main()
{
OutputStream Stream("Output.mp4", 672, 380, 25, true);
Stream.Initialize();
int i = 100;
while(i--)
{
//... Generate a frame
Stream.WriteFrame(Frame);
}
Stream.CloseFile();
}
OutputStream::OutputStream(const std::string& Path, unsigned int Width, unsigned int Height, int Framerate, bool IsBGR)
: Stream()
, FrameIndex(0)
{
auto& ID = *m_InternalData;
ID.Path = Path;
ID.Width = Width;
ID.Height= Height;
ID.Framerate.num = Framerate;
ID.Framerate.den = 1;
ID.PixelFormat = IsBGR ? AV_PIX_FMT_BGR24 : AV_PIX_FMT_RGB24;
ID.CodecID = AV_CODEC_ID_H264;
ID.CodecTag = 0;
ID.AspectRatio.num = 1;
ID.AspectRatio.den = 1;
}
CameraStreamError OutputStream::Initialize()
{
av_log_set_callback(&InputStream::LogCallback);
av_register_all();
avformat_network_init();
auto& ID = *m_InternalData;
av_init_packet(&ID.Packet);
int Result = avformat_alloc_output_context2(&ID.FormatContext, nullptr, nullptr, ID.Path.c_str());
if(Result < 0 || !ID.FormatContext)
{
STREAM_ERROR(UnknownError);
}
AVCodec* Encoder = avcodec_find_encoder(ID.CodecID);
if(!Encoder)
{
STREAM_ERROR(NoH264Support);
}
AVStream* OutStream = avformat_new_stream(ID.FormatContext, Encoder);
if(!OutStream)
{
STREAM_ERROR(UnknownError);
}
ID.CodecContext = avcodec_alloc_context3(Encoder);
if(!ID.CodecContext)
{
STREAM_ERROR(NoH264Support);
}
ID.CodecContext->time_base = av_inv_q(ID.Framerate);
{
AVCodecParameters* CodecParams = OutStream->codecpar;
CodecParams->width = ID.Width;
CodecParams->height = ID.Height;
CodecParams->format = AV_PIX_FMT_YUV420P;
CodecParams->codec_id = ID.CodecID;
CodecParams->codec_type = AVMEDIA_TYPE_VIDEO;
CodecParams->profile = FF_PROFILE_H264_MAIN;
CodecParams->level = 40;
Result = avcodec_parameters_to_context(ID.CodecContext, CodecParams);
if(Result < 0)
{
STREAM_ERROR(EncoderCreationError);
}
}
if(ID.IsVideo)
{
ID.CodecContext->width = ID.Width;
ID.CodecContext->height = ID.Height;
ID.CodecContext->sample_aspect_ratio = ID.AspectRatio;
ID.CodecContext->time_base = av_inv_q(ID.Framerate);
if(Encoder->pix_fmts)
{
ID.CodecContext->pix_fmt = Encoder->pix_fmts[0];
}
else
{
ID.CodecContext->pix_fmt = ID.PixelFormat;
}
}
//Snip
Result = avcodec_open2(ID.CodecContext, Encoder, nullptr);
if(Result < 0)
{
STREAM_ERROR(EncoderCreationError);
}
Result = avcodec_parameters_from_context(OutStream->codecpar, ID.CodecContext);
if(Result < 0)
{
STREAM_ERROR(EncoderCreationError);
}
if(ID.FormatContext->oformat->flags & AVFMT_GLOBALHEADER)
{
ID.CodecContext->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
}
OutStream->time_base = ID.CodecContext->time_base;
OutStream->avg_frame_rate= av_inv_q(OutStream->time_base);
if(!(ID.FormatContext->oformat->flags & AVFMT_NOFILE))
{
Result = avio_open(&ID.FormatContext->pb, ID.Path.c_str(), AVIO_FLAG_WRITE);
if(Result < 0)
{
STREAM_ERROR(FileNotWriteable);
}
}
Result = avformat_write_header(ID.FormatContext, nullptr);
if(Result < 0)
{
STREAM_ERROR(WriteFailed);
}
ID.Output = std::make_unique<FFMPEG::Frame>(ID.CodecContext->width, ID.CodecContext->height, ID.CodecContext->pix_fmt);
ID.ConversionContext = sws_getCachedContext(
ID.ConversionContext,
ID.Width,
ID.Height,
ID.PixelFormat,
ID.CodecContext->width,
ID.CodecContext->height,
ID.CodecContext->pix_fmt,
SWS_BICUBIC,
NULL,
NULL,
NULL);
return CameraStreamError::Success;
}
CameraStreamError OutputStream::WriteFrame(FFMPEG::Frame* Frame)
{
auto& ID = *m_InternalData;
ID.Output->Prepare();
int OutputSliceSize = sws_scale(m_InternalData->ConversionContext, Frame->GetFrame()->data, Frame->GetFrame()->linesize, 0, Frame->GetHeight(), ID.Output->GetFrame()->data, ID.Output->GetFrame()->linesize);
ID.Output->GetFrame()->pts = ID.CodecContext->frame_number;
int Result = avcodec_send_frame(GetData().CodecContext, ID.Output->GetFrame());
if(Result == AVERROR(EAGAIN))
{
CameraStreamError ResultErr = SendAll();
if(ResultErr != CameraStreamError::Success)
{
return ResultErr;
}
Result = avcodec_send_frame(GetData().CodecContext, ID.Output->GetFrame());
}
if(Result == 0)
{
CameraStreamError ResultErr = SendAll();
if(ResultErr != CameraStreamError::Success)
{
return ResultErr;
}
}
FrameIndex++;
return CameraStreamError::Success;
}
CameraStreamError OutputStream::SendAll(void)
{
auto& ID = *m_InternalData;
int Result;
do
{
AVPacket TempPacket = {};
av_init_packet(&TempPacket);
Result = avcodec_receive_packet(GetData().CodecContext, &TempPacket);
if(Result == 0)
{
av_packet_rescale_ts(&TempPacket, ID.CodecContext->time_base, ID.FormatContext->streams[0]->time_base);
TempPacket.stream_index = ID.FormatContext->streams[0]->index;
//avio_write(ID.FormatContext->pb, TempPacket.data, TempPacket.size);
Result = av_interleaved_write_frame(ID.FormatContext, &TempPacket);
if(Result < 0)
{
STREAM_ERROR(WriteFailed);
}
av_packet_unref(&TempPacket);
}
else if(Result != AVERROR(EAGAIN))
{
continue;
}
else if(Result != AVERROR_EOF)
{
break;
}
else if(Result < 0)
{
STREAM_ERROR(WriteFailed);
}
} while (Result == 0);
return CameraStreamError::Success;
}
CameraStreamError OutputStream::CloseFile()
{
auto& ID = *m_InternalData;
while(true)
{
//Flush
int Result = avcodec_send_frame(ID.CodecContext, nullptr);
if(Result == 0)
{
CameraStreamError StrError = SendAll();
if(StrError != CameraStreamError::Success)
{
return StrError;
}
}
else if(Result == AVERROR_EOF)
{
break;
}
else
{
STREAM_ERROR(WriteFailed);
}
}
int Result = av_write_trailer(ID.FormatContext);
if(Result < 0)
{
STREAM_ERROR(WriteFailed);
}
if(!(ID.FormatContext->oformat->flags& AVFMT_NOFILE))
{
Result = avio_close(ID.FormatContext->pb);
if(Result < 0)
{
STREAM_ERROR(WriteFailed);
}
}
return CameraStreamError::Success;
}
注意我已经简化一些东西,内联在其它地方的几个位。我也删除了所有关闭代码,因为在文件关闭后发生的任何事情都是不相关的。
完整的回购在这里:https://github.com/IanNorris/Witness如果你克隆这个问题是与'诊断'输出,输出文件是好的。 X有两种硬编码路径:
谢谢!我其实在代码中有这些,但你的回答让我检查它被调用。它是 - 但不是两个文件,只有第一个。这是由于缺少析构函数造成的。它现在按预期工作。 – icStatic