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Autres articles (79)
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Personnaliser en ajoutant son logo, sa bannière ou son image de fond
5 septembre 2013, parCertains thèmes prennent en compte trois éléments de personnalisation : l’ajout d’un logo ; l’ajout d’une bannière l’ajout d’une image de fond ;
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Le profil des utilisateurs
12 avril 2011, parChaque utilisateur dispose d’une page de profil lui permettant de modifier ses informations personnelle. Dans le menu de haut de page par défaut, un élément de menu est automatiquement créé à l’initialisation de MediaSPIP, visible uniquement si le visiteur est identifié sur le site.
L’utilisateur a accès à la modification de profil depuis sa page auteur, un lien dans la navigation "Modifier votre profil" est (...) -
Configurer la prise en compte des langues
15 novembre 2010, parAccéder à la configuration et ajouter des langues prises en compte
Afin de configurer la prise en compte de nouvelles langues, il est nécessaire de se rendre dans la partie "Administrer" du site.
De là, dans le menu de navigation, vous pouvez accéder à une partie "Gestion des langues" permettant d’activer la prise en compte de nouvelles langues.
Chaque nouvelle langue ajoutée reste désactivable tant qu’aucun objet n’est créé dans cette langue. Dans ce cas, elle devient grisée dans la configuration et (...)
Sur d’autres sites (13239)
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ffmpeg facebook live video download issues [closed]
20 mai 2020, par HakanKWhat is the best working code line for ffmpeg to record Facebook live video stream ?



Kind regards



Hakan


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Media Type Unrecognized with FFMPEG file generated
2 août 2016, par pirmaxI have an upload problem with the Twitter API.
The problem is caused by codecs I think.I use FFMPEG to concatenate an audio file and an image, so to build a 30-second video to a file not exceeding in the 1MB.
Here is the code that allows me to build this file and then upload the video via the Twitter API :
var convert = function(image, audio, output) {
var proc = ffmpeg(image)
.loop(30)
.addInput(audio)
.format('mp4')
.videoBitrate('1024k')
.videoCodec('mpeg4')
.size('640x640')
.audioBitrate('128k')
.audioChannels(2)
.audioCodec('libfaac')
.on('end', function() {
console.log(output);
fs.readFile(output, function(err, base64data) {
client.post('media/upload', { media: base64data }, function (error, media, response) {
console.log(media);
});
});
})
.on('error', function(err) {
console.log('an error happened: ' + err.message);
})
.save(output);
};Each upload, I get the following message : unrecognized media type
{ request: '/1.1/media/upload.json',
error: 'media type unrecognized.' }Could you help me please ? Thanks !
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Black screen when playing a video with ffmpeg and SDL on iOS
1er avril 2012, par patrickI'm attempting to create a video player on iOS using ffmpeg and SDL. I'm decoding the video stream and attempting to convert the pixel data into a SDL_Surface and then convert that over to an SDL_Texture and render it on screen. However, all I'm getting is a black screen. I know the video file is good and can be viewed fine from VLC. Any idea what I'm missing here ?
Initialization code :
// initialize SDL (Simple DirectMedia Layer) to playback the content
if( SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER) )
{
DDLogError(@"Unable to initialize SDL");
return NO;
}
// create window and renderer
window = SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT,
SDL_WINDOW_OPENGL | SDL_WINDOW_BORDERLESS |
SDL_WINDOW_SHOWN);
if ( window == 0 )
{
DDLogError(@"Unable to initialize SDL Window");
}
renderer = SDL_CreateRenderer(window, -1, 0);
if ( !renderer )
{
DDLogError(@"Unable to initialize SDL Renderer");
}
// Initialize the FFMpeg and register codecs and their respected file formats
av_register_all();Playback code :
AVFormatContext *formatContext = NULL ;DDLogInfo(@"Opening media file at location:%@", filePath);
const char *filename = [filePath cStringUsingEncoding:NSUTF8StringEncoding];
// Open media file
if( avformat_open_input(&formatContext, filename, NULL, NULL) != 0 )
{
DDLogWarn(@"Unable to open media file. [File:%@]", filePath);
NSString *failureReason = NSLocalizedString(@"Unable to open file.", @"Media playback failed, unable to open file.");
if ( error != NULL )
{
*error = [NSError errorWithDomain:MediaPlayerErrorDomain
code:UNABLE_TO_OPEN
userInfo:[NSDictionary dictionaryWithObject:failureReason
forKey:NSLocalizedFailureReasonErrorKey]];
}
return NO; // Couldn't open file
}
// Retrieve stream information
if( avformat_find_stream_info(formatContext, NULL) <= 0 )
{
DDLogWarn(@"Unable to locate stream information for file. [File:%@]", filePath);
NSString *failureReason = NSLocalizedString(@"Unable to find audio/video stream information.", @"Media playback failed, unable to find stream information.");
if ( error != NULL )
{
*error = [NSError errorWithDomain:MediaPlayerErrorDomain
code:UNABLE_TO_FIND_STREAM
userInfo:[NSDictionary dictionaryWithObject:failureReason
forKey:NSLocalizedFailureReasonErrorKey]];
}
return NO; // Missing stream information
}
// Find the first video or audio stream
int videoStream = -1;
int audioStream = -1;
DDLogInfo(@"Locating stream information for media file");
for( int index=0; index<(formatContext->nb_streams); index++)
{
if( formatContext->streams[index]->codec->codec_type==AVMEDIA_TYPE_VIDEO )
{
DDLogInfo(@"Found video stream");
videoStream = index;
break;
}
else if( mediaType == AUDIO_FILE &&
(formatContext->streams[index]->codec->codec_type==AVMEDIA_TYPE_AUDIO) )
{
DDLogInfo(@"Found audio stream");
audioStream = index;
break;
}
}
if( videoStream == -1 && (audioStream == -1) )
{
DDLogWarn(@"Unable to find video or audio stream for file");
NSString *failureReason = NSLocalizedString(@"Unable to locate audio/video stream.", @"Media playback failed, unable to locate media stream.");
if ( error != NULL )
{
*error = [NSError errorWithDomain:MediaPlayerErrorDomain
code:UNABLE_TO_FIND_STREAM
userInfo:[NSDictionary dictionaryWithObject:failureReason
forKey:NSLocalizedFailureReasonErrorKey]];
}
return NO; // Didn't find a video or audio stream
}
// Get a pointer to the codec context for the video/audio stream
AVCodecContext *codecContext;
DDLogInfo(@"Attempting to locate the codec for the media file");
if ( videoStream > -1 )
{
codecContext = formatContext->streams[videoStream]->codec;
}
else
{
codecContext = formatContext->streams[audioStream]->codec;
}
// Now that we have information about the codec that the file is using,
// we need to actually open the codec to decode the content
DDLogInfo(@"Attempting to open the codec to playback the media file");
AVCodec *codec;
// Find the decoder for the video stream
codec = avcodec_find_decoder(codecContext->codec_id);
if( codec == NULL )
{
DDLogWarn(@"Unsupported codec! Cannot playback meda file [File:%@]", filePath);
NSString *failureReason = NSLocalizedString(@"Unsupported file format. Cannot playback media.", @"Media playback failed, unsupported codec.");
if ( error != NULL )
{
*error = [NSError errorWithDomain:MediaPlayerErrorDomain
code:UNSUPPORTED_CODEC
userInfo:[NSDictionary dictionaryWithObject:failureReason
forKey:NSLocalizedFailureReasonErrorKey]];
}
return NO; // Codec not found
}
// Open codec
if( avcodec_open2(codecContext, codec, NULL) < 0 )
{
DDLogWarn(@"Unable to open codec! Cannot playback meda file [File:%@]", filePath);
NSString *failureReason = NSLocalizedString(@"Unable to open media codec. Cannot playback media.", @"Media playback failed, cannot open codec.");
if ( error != NULL )
{
*error = [NSError errorWithDomain:MediaPlayerErrorDomain
code:UNABLE_TO_LOAD_CODEC
userInfo:[NSDictionary dictionaryWithObject:failureReason
forKey:NSLocalizedFailureReasonErrorKey]];
}
return NO; // Could not open codec
}
// Allocate player frame
AVFrame *playerFrame=avcodec_alloc_frame();
// Allocate an AVFrame structure
AVFrame *RGBframe=avcodec_alloc_frame();
if( RGBframe==NULL )
{
// could not create a frame to convert our video frame
// to a 16-bit RGB565 frame.
DDLogWarn(@"Unable to convert video frame. Cannot playback meda file [File:%@]", filePath);
NSString *failureReason = NSLocalizedString(@"Problems interpreting video frame information.", @"Media playback failed, cannot convert frame.");
if ( error != NULL )
{
*error = [NSError errorWithDomain:MediaPlayerErrorDomain
code:UNABLE_TO_LOAD_FRAME
userInfo:[NSDictionary dictionaryWithObject:failureReason
forKey:NSLocalizedFailureReasonErrorKey]];
}
return NO; // Could not open codec
}
int frameFinished = 0;
AVPacket packet;
// Figure out the destination width/height based on the screen size
int destHeight = codecContext->height;
int destWidth = codecContext->width;
if ( destHeight > SCREEN_HEIGHT || (destWidth > SCREEN_WIDTH) )
{
if ( destWidth > SCREEN_WIDTH )
{
float percentDiff = ( destWidth - SCREEN_WIDTH ) / (float)destWidth;
destWidth = destWidth - (int)(destWidth * percentDiff );
destHeight = destHeight - (int)(destHeight * percentDiff );
}
if ( destHeight > SCREEN_HEIGHT )
{
float percentDiff = (destHeight - SCREEN_HEIGHT ) / (float)destHeight;
destWidth = destWidth - (int)(destWidth * percentDiff );
destHeight = destHeight - (int)(destHeight * percentDiff );
}
}
SwsContext *swsContext = sws_getContext(codecContext->width, codecContext->height, codecContext->pix_fmt, destWidth, destHeight, PIX_FMT_RGB565, SWS_BICUBIC, NULL, NULL, NULL);
while( av_read_frame(formatContext, &packet) >= 0 )
{
// Is this a packet from the video stream?
if( packet.stream_index == videoStream )
{
// Decode video frame
avcodec_decode_video2(codecContext, playerFrame, &frameFinished, &packet);
// Did we get a video frame?
if( frameFinished != 0 )
{
// Convert the content over to RGB565 (16-bit RGB) to playback with SDL
uint8_t *dst[3];
int dstStride[3];
// Set the destination stride
for (int plane = 0; plane < 3; plane++)
{
dstStride[plane] = codecContext->width*2;
dst[plane]= (uint8_t*) malloc(dstStride[plane]*destHeight);
}
sws_scale(swsContext, playerFrame->data,
playerFrame->linesize, 0,
destHeight,
dst, dstStride);
// Create the SDL surface frame that we are going to use to draw our video
// 16-bit RGB so 2 bytes per pixel (pitch = width*(bytes per pixel))
int pitch = destWidth*2;
SDL_Surface *frameSurface = SDL_CreateRGBSurfaceFrom(dst[0], destWidth, destHeight, 16, pitch, 0, 0, 0, 0);
// Clear the old frame first
SDL_RenderClear(renderer);
// Move the frame over to a texture and render it on screen
SDL_Texture *texture = SDL_CreateTextureFromSurface(renderer, frameSurface);
SDL_SetTextureBlendMode(texture, SDL_BLENDMODE_BLEND);
// Draw the new frame on the screen
SDL_RenderPresent(renderer);
SDL_DestroyTexture(texture);
SDL_FreeSurface(frameSurface);
}
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