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    12 avril 2011, par

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    15 novembre 2010, par

    Accéder à la configuration et ajouter des langues prises en compte
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  • La sauvegarde automatique de canaux SPIP

    1er avril 2010, par

    Dans le cadre de la mise en place d’une plateforme ouverte, il est important pour les hébergeurs de pouvoir disposer de sauvegardes assez régulières pour parer à tout problème éventuel.
    Pour réaliser cette tâche on se base sur deux plugins SPIP : Saveauto qui permet une sauvegarde régulière de la base de donnée sous la forme d’un dump mysql (utilisable dans phpmyadmin) mes_fichiers_2 qui permet de réaliser une archive au format zip des données importantes du site (les documents, les éléments (...)

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  • avformat/dashenc : Set VP9 codec string with profile, level and bitdepth

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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 :.

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