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Médias (2)
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Granite de l’Aber Ildut
9 septembre 2011, par
Mis à jour : Septembre 2011
Langue : français
Type : Texte
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Géodiversité
9 septembre 2011, par ,
Mis à jour : Août 2018
Langue : français
Type : Texte
Autres articles (39)
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Les autorisations surchargées par les plugins
27 avril 2010, parMediaspip core
autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs -
MediaSPIP Player : problèmes potentiels
22 février 2011, parLe lecteur ne fonctionne pas sur Internet Explorer
Sur Internet Explorer (8 et 7 au moins), le plugin utilise le lecteur Flash flowplayer pour lire vidéos et son. Si le lecteur ne semble pas fonctionner, cela peut venir de la configuration du mod_deflate d’Apache.
Si dans la configuration de ce module Apache vous avez une ligne qui ressemble à la suivante, essayez de la supprimer ou de la commenter pour voir si le lecteur fonctionne correctement : /** * GeSHi (C) 2004 - 2007 Nigel McNie, (...) -
Keeping control of your media in your hands
13 avril 2011, parThe vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...)
Sur d’autres sites (7090)
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avcodec/ac3enc : Don't presume ch_layout to be AV_CHANNEL_ORDER_NATIVE
7 avril 2024, par Andreas Rheinhardtavcodec/ac3enc : Don't presume ch_layout to be AV_CHANNEL_ORDER_NATIVE
It is perfectly legal for users to use a custom layout
that is equivalent to a supported native one.
In this case the union in AVChannelLayout is not an uint64_t mask,
but a pointer to a custom map.Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
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ffmpeg with partial motion detection
2 mars 2021, par SilentfuryI have video files from a static surveillance camera and I try to re-encode them using some sort of motion detection filter (keeping the movements, droping the stills) in order to save space and play time.


I have successfully tried the two below filter options but it still feels not good enough. :


- 

- mpdecimate e.g. -vf "mpdecimate=hi=6480:lo=6420:frac=0.1,setpts=N/(15*TB)"
- select (e.g. -vf "select=gt(scene,0.4)")






The main problem is a moving bush in the camera view, that I would like to exclude from the motion detection.


Is there other/better ways of applying motion detection (and stills dropping) to ffmpeg ?
Is there any way to mask areas of the video that will be ignored in the above mentioned (or any other) motion detection filter/method ?


Many thanks in advance !


Edit :
in the mean time I found this excellent answer from Gyan


I am testing this now but would still appreciate other ideas


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Simple FFMpeg player for Android
23 janvier 2017, par don11995I have a problem with the output of AVFrame (AVPicture) into the ANativeWindow. I wrote simpe test code :
void *Player::readThread(void * reserved) {
ALOGD("Read thread started!");
VideoState *state = (VideoState *) reserved;
int err = 0;
int ret;
int i;
AVFormatContext *formatContext = NULL;
AVCodecContext *codecContext = NULL;
AVCodecParameters *codecParams = NULL;
AVCodecID codecID = AV_CODEC_ID_NONE;
AVCodec *decoder = NULL;
AVFrame *frame = NULL;
AVFrame *frameRGBA = NULL;
AVPacket packet;
struct SwsContext *img2RGBAContext;
ANativeWindow_Buffer windowBuffer;
uint8_t *RGBABuffer = NULL;
int RGBABufferSize = 0;
int got = 0;
int windowWidth = 640;
int windowHeight = 480;
const char *url = state->url.c_str();
if (url == NULL || strlen(url) <= 0) {
err = ERROR_UNKNOWN_URI;
goto exit;
}
ALOGD("URL to play: %s", url);
state->isPlaying = true;
formatContext = avformat_alloc_context();
if (formatContext == NULL) {
err = ERROR_OUT_OF_MEMORY;
goto exit;
}
ALOGD("formatContext allocated");
frame = av_frame_alloc();
if (frame == NULL) {
err = ERROR_OUT_OF_MEMORY;
goto exit;
}
ALOGD("frame allocated");
frameRGBA = av_frame_alloc();
if (frameRGBA == NULL) {
err = ERROR_OUT_OF_MEMORY;
goto exit;
}
ALOGD("frameRGBA allocated");
ret = avformat_open_input(&formatContext, url, NULL, NULL);
if (ret != 0) {
err = ERROR_CAN_NOT_OPEN_URI;
goto exit;
}
ALOGD("formatContext opened");
ret = avformat_find_stream_info(formatContext, NULL);
if (ret != 0) {
err = ERROR_CAN_NOT_FIND_STREAM_INFO;
goto exit;
}
ALOGD("file info found");
for (i = 0; i < formatContext->nb_streams; i++) {
AVStream *stream = formatContext->streams[i];
AVCodecParameters *codecParams = stream->codecpar;
AVCodecID codecID = codecParams->codec_id;
AVMediaType type = codecParams->codec_type;
const char *codecName = avcodec_get_name(codecID);
switch (type) {
case AVMEDIA_TYPE_AUDIO:
ALOGD("Stream [%d]: type=AUDIO codecName=%s",i,codecName);
break;
case AVMEDIA_TYPE_VIDEO:
ALOGD("Stream [%d]: type=VIDEO codecName=%s",i,codecName);
if (state->video_stream == -1) {
state->video_stream = i;
}
break;
case AVMEDIA_TYPE_SUBTITLE:
ALOGD("Stream [%d]: type=SUBTITLE codecName=%s",i,codecName);
break;
default:
ALOGD("Stream [%d]: type=UNKNOWN codecName=%s",i,codecName);
break;
}
}
if (state->video_stream == -1) {
err = ERROR_CAN_NOT_FIND_ANY_STREAM;
goto exit;
}
ALOGD("Video stream index: %d",state->video_stream);
codecParams = formatContext->streams[state->video_stream]->codecpar;
codecID = codecParams->codec_id;
if (codecID == AV_CODEC_ID_NONE) {
err = ERROR_UNKNOWN_CODEC;
goto exit;
}
ALOGD("Codec found");
decoder = avcodec_find_decoder(codecID);
if (decoder == NULL) {
err = ERROR_CAN_NOT_FIND_DECODER;
goto exit;
}
ALOGD("Decoder found");
codecContext = avcodec_alloc_context3(decoder);
if (codecContext == NULL) {
err = ERROR_OUT_OF_MEMORY;
goto exit;
}
ALOGD("codecContext created");
ret = avcodec_parameters_to_context(codecContext, codecParams);
if (ret < 0) {
err = ERROR_CAN_NOT_START_DECODER;
goto exit;
}
ALOGD("codecContext params was set");
ret = avcodec_open2(codecContext, decoder, NULL);
if (ret != 0) {
err = ERROR_CAN_NOT_START_DECODER;
goto exit;
}
ALOGD("Decoder opened");
if (state->window != NULL) {
ANativeWindow_setBuffersGeometry(state->window, codecParams->width, codecParams->height, WINDOW_FORMAT_RGB_565);
ALOGD("Window geometry changed");
}
if (codecParams->width>0 && codecParams->height>0) {
ALOGD("Video width: %d\nVideo height: %d",codecParams->width, codecParams->height);
img2RGBAContext = sws_getCachedContext(
NULL,
codecParams->width,
codecParams->height,
(AVPixelFormat)codecParams->format,
codecParams->width,
codecParams->height,
AV_PIX_FMT_RGB565,
SWS_BICUBIC,
NULL,
NULL,
NULL);
if (img2RGBAContext == NULL) {
err = ERROR_OUT_OF_MEMORY;
goto exit;
}
} else {
err = ERROR_CAN_NOT_START_DECODER;
goto exit;
}
ALOGD("img2RGBAContext created");
RGBABufferSize = av_image_get_buffer_size(AV_PIX_FMT_RGB565, codecParams->width, codecParams->height, 1);
RGBABuffer = (uint8_t *)malloc(RGBABufferSize*sizeof(uint8_t));
if (RGBABuffer == NULL) {
err = ERROR_OUT_OF_MEMORY;
goto exit;
}
ALOGD("frameRGBABuffer size %d bytes",RGBABufferSize);
ret = av_image_alloc(frameRGBA->data, frameRGBA->linesize, codecParams->width, codecParams->height, AV_PIX_FMT_RGB565, 1);
if (ret < 0) {
err = ERROR_OUT_OF_MEMORY;
goto exit;
}
while (av_read_frame(formatContext, &packet) >= 0 && state->isPlaying) {
if (packet.stream_index != state->video_stream) {
ALOGD("Packet is not a video packet. Discard.");
av_packet_unref(&packet);
continue;
}
ret = avcodec_send_packet(codecContext, &packet);
if (ret != 0) {
ALOGE("Can not send packet to decode");
av_packet_unref(&packet);
continue;
}
ret = avcodec_receive_frame(codecContext, frame);
if (ret != 0) {
ALOGE("Can not receive decoded frame yet");
av_packet_unref(&packet);
continue;
}
ALOGD("Converting image to RGB565...");
sws_scale(img2RGBAContext, frame->data, frame->linesize, 0, codecParams->height, frameRGBA->data, frameRGBA->linesize);
ALOGD("Image converted to RGB565");
av_image_copy_to_buffer(RGBABuffer,
RGBABufferSize,
frameRGBA->data,
frameRGBA->linesize,
AV_PIX_FMT_RGB565,
codecParams->width,
codecParams->height,
1);
ALOGD("Image wrote into frameRGBABuffer");
if (ANativeWindow_lock(state->window, &windowBuffer, NULL) == 0) {
ALOGD("Writing %d bytes to windowBuffer", RGBABufferSize);
memcpy(windowBuffer.bits, RGBABuffer, RGBABufferSize);
ANativeWindow_unlockAndPost(state->window);
ALOGD("Image displayed");
} else {
ALOGE("Can not display frame");
}
av_packet_unref(&packet);
}
exit:
ALOGD("Releasing resources...");
if (err!=0) {
state->isPlaying = false;
#if !LOG_NDEBUG
switch (err) {
case ERROR_OUT_OF_MEMORY:
ALOGE("Out of memory!");
break;
case ERROR_CAN_NOT_OPEN_URI:
ALOGE("Can not open URI: %s", url);
break;
case ERROR_UNKNOWN_URI:
ALOGE("Unknown URI to open!");
break;
default:
ALOGE("Unknown error");
break;
}
#endif
// TODO: send error to listener
}
sws_freeContext(img2RGBAContext);
free(RGBABuffer);
av_free(frame);
av_freep(&frameRGBA->data[0]);
av_packet_unref(&packet);
avcodec_close(codecContext);
avformat_close_input(&formatContext);
avformat_free_context(formatContext);
ALOGD("Read thread closed!");
}I faced with the next problem in some videos :
For example, this video gives me next logs :10-23 14:53:42.212 26970-4527/com.don.ffmpegplayer D/Player: Read thread started!
10-23 14:53:42.212 26970-4527/com.don.ffmpegplayer D/Player: URL to play: http://www.ex.ua/load/280797285
10-23 14:53:42.212 26970-4527/com.don.ffmpegplayer D/Player: formatContext allocated
10-23 14:53:42.212 26970-4527/com.don.ffmpegplayer D/Player: frame allocated
10-23 14:53:42.212 26970-4527/com.don.ffmpegplayer D/Player: frameRGBA allocated
10-23 14:53:42.846 26970-4527/com.don.ffmpegplayer D/Player: formatContext opened
10-23 14:53:42.879 26970-4527/com.don.ffmpegplayer D/Player: file info found
10-23 14:53:42.879 26970-4527/com.don.ffmpegplayer D/Player: Stream [0]: type=VIDEO codecName=h264
10-23 14:53:42.879 26970-4527/com.don.ffmpegplayer D/Player: Stream [1]: type=AUDIO codecName=ac3
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: Stream [2]: type=AUDIO codecName=ac3
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: Stream [3]: type=AUDIO codecName=ac3
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: Stream [4]: type=SUBTITLE codecName=subrip
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: Video stream index: 0
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: Codec found
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: Decoder found
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: codecContext created
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: codecContext params was set
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: Decoder opened
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: Window geometry changed
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: Video width: 1024
Video height: 424
10-23 14:53:42.882 26970-4527/com.don.ffmpegplayer D/Player: img2RGBAContext created
10-23 14:53:42.882 26970-4527/com.don.ffmpegplayer D/Player: frameRGBABuffer size 868352 bytes
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer E/Player: Can not receive decoded frame yet
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.899 26970-4527/com.don.ffmpegplayer E/Player: Can not receive decoded frame yet
10-23 14:53:42.905 26970-4527/com.don.ffmpegplayer D/Player: Converting image to RGB565...
10-23 14:53:42.918 26970-4527/com.don.ffmpegplayer D/Player: Image converted to RGB565
10-23 14:53:42.919 26970-4527/com.don.ffmpegplayer D/Player: Image wrote into frameRGBABuffer
10-23 14:53:42.920 26970-4527/com.don.ffmpegplayer D/Player: Writing 868352 bytes to windowBuffer
10-23 14:53:42.921 26970-4527/com.don.ffmpegplayer D/Player: Image displayed
10-23 14:53:42.926 26970-4527/com.don.ffmpegplayer D/Player: Converting image to RGB565...
10-23 14:53:42.934 26970-4527/com.don.ffmpegplayer D/Player: Image converted to RGB565
10-23 14:53:42.935 26970-4527/com.don.ffmpegplayer D/Player: Image wrote into frameRGBABuffer
10-23 14:53:42.936 26970-4527/com.don.ffmpegplayer D/Player: Writing 868352 bytes to windowBuffer
10-23 14:53:42.937 26970-4527/com.don.ffmpegplayer D/Player: Image displayedWhat am I doing wrong ? If I understood correctly, I need to follow next steps :
- Get decoded AVFrame from decoder
- Convert AVFrame data to RGB565 or RGB8888
- Get pixel data from converted frame
- Write it to native window
But in this code two points confuse me : is
ANative_setBuffersGeometrycalled correctly and whyframeRGBABuffersize is 868352 bytes ? If video size is 1024*424frameRGBABuffersize must bewidth*height*4, isn’t it ? If I changeframeRGBABuffersize towidth*height*4program carashes after first image diplayed. I pass video dimmensions toANative_setBuffersGeometry.For any help thanks in anvance.
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