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Mot : - Tags -/Christian Nold

Autres articles (20)

  • Les autorisations surchargées par les plugins

    27 avril 2010, par

    Mediaspip core
    autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs

  • MediaSPIP Init et Diogène : types de publications de MediaSPIP

    11 novembre 2010, par

    À l’installation d’un site MediaSPIP, le plugin MediaSPIP Init réalise certaines opérations dont la principale consiste à créer quatre rubriques principales dans le site et de créer cinq templates de formulaire pour Diogène.
    Ces quatre rubriques principales (aussi appelées secteurs) sont : Medias ; Sites ; Editos ; Actualités ;
    Pour chacune de ces rubriques est créé un template de formulaire spécifique éponyme. Pour la rubrique "Medias" un second template "catégorie" est créé permettant d’ajouter (...)

  • Les vidéos

    21 avril 2011, par

    Comme les documents de type "audio", Mediaspip affiche dans la mesure du possible les vidéos grâce à la balise html5 .
    Un des inconvénients de cette balise est qu’elle n’est pas reconnue correctement par certains navigateurs (Internet Explorer pour ne pas le nommer) et que chaque navigateur ne gère en natif que certains formats de vidéos.
    Son avantage principal quant à lui est de bénéficier de la prise en charge native de vidéos dans les navigateur et donc de se passer de l’utilisation de Flash et (...)

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

    23 avril 2018, par Karthick Jeyapal
    avformat/dashenc : Set VP9 codec string with profile, level and bitdepth
    

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    • [DH] libavformat/dashenc.c
  • "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 :.