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  • "moov atom not found" when using av_interleaved_write_frame but not avio_write

    9 octobre 2017, par icStatic

    I am attempting to put together a class that can take arbitrary frames and construct a video from it using the ffmpeg 3.3.3 API. I’ve been struggling to find a good example for this as the examples still seem to be using deprecated functions, so I’ve attempted to patch this using the documentation in the headers and by referring to a few github repos that seem to be using the new version.

    If I use av_interleaved_write_frame to write the encoded packets to the output then ffprobe outputs the following :

    [mov,mp4,m4a,3gp,3g2,mj2 @ 0000000002760120] moov atom not found0
    
X:\Diagnostics.mp4: Invalid data found when processing input

    ffplay is unable to play the file generated using this method.

    If I instead swap it out for a call to avio_write, ffprobe instead outputs :

    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 can mostly play this file until it gets towards the end, when it outputs :

    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 cannot play files from either method. The second method’s file displays a single black frame then hides the video output. The first does not display anything. Neither of them give a video duration.

    Does anyone have any ideas what’s happening here ? I assume my solution is close to working as I’m getting a good chunk of valid frames coming through.

    Code :

    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( 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;
    
}

    Note I’ve simplified a few things and inlined a few bits that were elsewhere. I’ve also removed all the shutdown code as anything that happens after the file is closed is irrelevant.

    Full repo here : https://github.com/IanNorris/Witness If you clone this the issue is with the ’Diagnostics’ output, the Output file is fine. There are two hardcoded paths to X :.

  • "moov atom not found" when using av_interleaved_write_frame but not avio_write

    9 octobre 2017, par icStatic

    I am attempting to put together a class that can take arbitrary frames and construct a video from it using the ffmpeg 3.3.3 API. I’ve been struggling to find a good example for this as the examples still seem to be using deprecated functions, so I’ve attempted to patch this using the documentation in the headers and by referring to a few github repos that seem to be using the new version.

    If I use av_interleaved_write_frame to write the encoded packets to the output then ffprobe outputs the following :

    [mov,mp4,m4a,3gp,3g2,mj2 @ 0000000002760120] moov atom not found0
    
X:\Diagnostics.mp4: Invalid data found when processing input

    ffplay is unable to play the file generated using this method.

    If I instead swap it out for a call to avio_write, ffprobe instead outputs :

    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 can mostly play this file until it gets towards the end, when it outputs :

    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 cannot play files from either method. The second method’s file displays a single black frame then hides the video output. The first does not display anything. Neither of them give a video duration.

    Does anyone have any ideas what’s happening here ? I assume my solution is close to working as I’m getting a good chunk of valid frames coming through.

    Code :

    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( 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;
    
}

    Note I’ve simplified a few things and inlined a few bits that were elsewhere. I’ve also removed all the shutdown code as anything that happens after the file is closed is irrelevant.

    Full repo here : https://github.com/IanNorris/Witness If you clone this the issue is with the ’Diagnostics’ output, the Output file is fine. There are two hardcoded paths to X :.

  • lavf/mp3dec : avoid printing useless message in default log level

    8 mars 2016, par Moritz Barsnick
    lavf/mp3dec : avoid printing useless message in default log level

    "Skipping 0 bytes of junk" is useless to the user, and essentially
    
indicates a NOP. At 0 bytes, this message is now pushed back to
    
the verbose log level.
    

    Signed-off-by : Moritz Barsnick <barsnick@gmx.net>
    • [DH] libavformat/mp3dec.c

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