Recherche avancée
Médias (91)
-
Géodiversité
9 septembre 2011, par ,
Mis à jour : Août 2018
Langue : français
Type : Texte
-
USGS Real-time Earthquakes
8 septembre 2011, par
Mis à jour : Septembre 2011
Langue : français
Type : Texte
-
SWFUpload Process
6 septembre 2011, par
Mis à jour : Septembre 2011
Langue : français
Type : Texte
-
La conservation du net art au musée. Les stratégies à l’œuvre
26 mai 2011
Mis à jour : Juillet 2013
Langue : français
Type : Texte
-
Podcasting Legal guide
16 mai 2011, par
Mis à jour : Mai 2011
Langue : English
Type : Texte
-
Creativecommons informational flyer
16 mai 2011, par
Mis à jour : Juillet 2013
Langue : English
Type : Texte
Autres articles (96)
-
MediaSPIP 0.1 Beta version
25 avril 2011, parMediaSPIP 0.1 beta is the first version of MediaSPIP proclaimed as "usable".
The zip file provided here only contains the sources of MediaSPIP in its standalone version.
To get a working installation, you must manually install all-software dependencies on the server.
If you want to use this archive for an installation in "farm mode", you will also need to proceed to other manual (...) -
Multilang : améliorer l’interface pour les blocs multilingues
18 février 2011, parMultilang est un plugin supplémentaire qui n’est pas activé par défaut lors de l’initialisation de MediaSPIP.
Après son activation, une préconfiguration est mise en place automatiquement par MediaSPIP init permettant à la nouvelle fonctionnalité d’être automatiquement opérationnelle. Il n’est donc pas obligatoire de passer par une étape de configuration pour cela. -
Formulaire personnalisable
21 juin 2013, parCette page présente les champs disponibles dans le formulaire de publication d’un média et il indique les différents champs qu’on peut ajouter. Formulaire de création d’un Media
Dans le cas d’un document de type média, les champs proposés par défaut sont : Texte Activer/Désactiver le forum ( on peut désactiver l’invite au commentaire pour chaque article ) Licence Ajout/suppression d’auteurs Tags
On peut modifier ce formulaire dans la partie :
Administration > Configuration des masques de formulaire. (...)
Sur d’autres sites (8150)
-
avformat/dashenc : Set VP9 codec string with profile, level and bitdepth
23 avril 2018, par Karthick Jeyapal -
"moov atom not found" when using av_interleaved_write_frame but not avio_write
9 octobre 2017, par icStaticI 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 inputffplay 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 tbcffplay 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=0/0VLC 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 icStaticI 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 inputffplay 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 tbcffplay 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=0/0VLC 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 :.
Syndiquer tout le site
