Recherche avancée
Médias (1)
-
Revolution of Open-source and film making towards open film making
6 octobre 2011, par
Mis à jour : Juillet 2013
Langue : English
Type : Texte
Autres articles (48)
-
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 -
La sauvegarde automatique de canaux SPIP
1er avril 2010, parDans 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 (...) -
Use, discuss, criticize
13 avril 2011, parTalk to people directly involved in MediaSPIP’s development, or to people around you who could use MediaSPIP to share, enhance or develop their creative projects.
The bigger the community, the more MediaSPIP’s potential will be explored and the faster the software will evolve.
A discussion list is available for all exchanges between users.
Sur d’autres sites (8365)
-
FFMpeg C++ encoder fails with hardware acceleration quick sync intel
28 août 2022, par tealsI am trying to debug an issue I have with a simple C++ encoder using FFMmpeg. The following code below works correctly on these other hardware acceleration systems/platforms :


- 

- Mac/VideoToolbox,
- Cuda/NVEnc
- Raspberry pi/h264_v4l2m2m.








It fails on intel quick sync at
avcodec_open2. I'm using Ubuntu 22.04. I built FFMpeg from source with the Intel Media SDK installed and configured. I verified that the QuickSync install works. I also have a corresponding decoder implementation that works correctly using intel quick sync. So I know everything properly installed. I am also running this on an 11th Gen Intel CPU.

[hevc_qsv @ 0x564b0d34f0c0] Low power mode is unsupported (This sometimes shows up)
[hevc_qsv @ 0x563691234000] some encoding parameters are not supported by the QSV runtime. Please double check the input parameters.
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height


This is the only error that I get and I haven't found any helpful resources. I tried playing around with different parameters but nothing seems to work. Any help or insight would be extremely helpful.


bool VideoEncoder::create() {
 char const* outfile = filePath.c_str();

 // open output format context
 int ret = avformat_alloc_output_context2(&ofctx, nullptr, nullptr, outfile);
 if (ret < 0) {
 std::cerr << "fail to avformat_alloc_output_context2(" << outfile << "): ret=" << ret;
 return false;
 }

 // create new video stream
 const AVCodec* codec = avcodec_find_encoder_by_name(encoderName.c_str());
 vstrm = avformat_new_stream(ofctx, codec);
 if (!vstrm) {
 std::cerr << "fail to avformat_new_stream";
 return false;
 }

 // open video encoder
 cctx = avcodec_alloc_context3(codec);
 if (!vstrm) {
 std::cerr << "fail to avcodec_alloc_context3";
 return false;
 }
 const AVRational dst_fps = {fps, 1};
 cctx->width = width;
 cctx->height = height;
 if(pixel_format != AV_PIX_FMT_NONE) {
 cctx->pix_fmt = pixel_format;
 }
 else {
 cctx->pix_fmt = codec->pix_fmts[0];
 }
 cctx->time_base = av_inv_q(dst_fps);
 cctx->framerate = dst_fps;
 cctx->bit_rate = bitrate * 1000000;


 AVDictionary* options = nullptr;
 if(gpu_id >= 0) {
 av_dict_set_int(&options, "gpu", gpu_id, 0);
 }

 
 if (ofctx->oformat->flags & AVFMT_GLOBALHEADER)
 cctx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
 ret = avcodec_open2(cctx, codec, &options);
 if (ret < 0) {
 std::cerr << "fail to avcodec_open2: ret=" << ret;
 return false;
 }
 avcodec_parameters_from_context(vstrm->codecpar, cctx);

 //For mac/quicktime we need to add hvc1 tag.
 if (encoderName.find("hevc") != std::string::npos) {
 vstrm->codecpar->codec_tag = MKTAG('h', 'v', 'c', '1');
 }

 /*
 std::cout
 << "outfile: " << outfile << "\n"
 << "format: " << ofctx->oformat->name << "\n"
 << "vcodec: " << codec->name << "\n"
 << "size: " << width << 'x' << height << "\n"
 << "fps: " << av_q2d(cctx->framerate) << "\n"
 << "pixfmt: " << av_get_pix_fmt_name(cctx->pix_fmt) << "\n"
 << std::flush;*/

 // initialize sample scaler
 swsCtx = sws_getContext(
 width, height, AV_PIX_FMT_BGR24,
 width, height, cctx->pix_fmt,
 SWS_BILINEAR, nullptr, nullptr, nullptr);
 if (!swsCtx) {
 std::cerr << "fail to sws_getContext";
 return false;
 }

 // allocate frame buffer for encoding
 frame = av_frame_alloc();
 frame->width = width;
 frame->height = height;
 frame->format = static_cast<int>(cctx->pix_fmt);
 ret = av_frame_get_buffer(frame, 32);
 if (ret < 0) {
 std::cerr << "fail to av_frame_get_buffer: ret=" << ret;
 return false;
 }

 // allocate packet to retrive encoded frame
 pkt = av_packet_alloc();
 // open output IO context
 ret = avio_open2(&ofctx->pb, outfile, AVIO_FLAG_WRITE, nullptr, nullptr);
 if (ret < 0) {
 std::cerr << "fail to avio_open2: ret=" << ret;
 return false;
 }

 // write media container header (if any)
 ret = avformat_write_header(ofctx, nullptr);
 if (ret < 0) {
 std::cerr << "fail to avformat_write_header: ret=" << ret;
 return false;
 }

 return true;
}
</int>

-
libavformat stuck in ff_network_wait_fd
3 juin 2020, par DanielI'm using libavformat for remuxing some live video feeds (rtsp).



I can't really create a minimal reproducable example, because the issue is not reproducable, but I have an attached debugger and if I have any minimal chance to examine the root cause I'd not skip any chance.



The stream is opened via avformat_open_input, and there is a custom IO for writing the output (avformat_alloc_output_context2).



The problem is that avformat is stuck in ff_network_wait_fd, at least by gdb :



#0 0xb673e120 in poll () at ../sysdeps/unix/syscall-template.S:84
#1 0x004a3ff4 in ff_network_wait_fd (fd=-1357954584, write=1) at libavformat/network.c:72
#2 0xaf0f428e in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)



There was a network failure during the connection or the stream and I have not got any aggressive stream closing mechanism (everything is non blocking, there is no waits, sleeps, everything is event-based by libev).



This just happened once during one month so it's very hard to reproduce but it is still running and gdb is attached.



I'm curious if I have any chance to dig deeper. The stack seems corrupted and also the fd seems invalid for what ff_network_wait_fd waits for.



Also, I never call ff_network_wait_fd directly, but there is an alternative : ff_network_wait_fd_timeout. Is it possible to ask libavformat to use this alternative so it won't block my thread if there is unreliable network ?


-
How to install ffmpeg on UBI docker images ?
7 janvier 2024, par S. D.I'm looking for a simple way to install ffmpeg in a UBI8 (ubi-minimal) docker image.


I tried running in the dockerfile the following :


RUN microdnf upgrade
RUN microdnf install ffmpeg


And I'm getting :


------
 > [7/8] RUN microdnf install ffmpeg:
#11 0.375
#11 0.375 (microdnf:1): librhsm-WARNING **: 07:58:19.229: Found 0 entitlement certificates
#11 0.375
#11 0.375 (microdnf:1): librhsm-WARNING **: 07:58:19.230: Found 0 entitlement certificates
#11 0.519 error: No package matches 'ffmpeg'
------
executor failed running [/bin/sh -c microdnf install ffmpeg]: exit code: 1



How can ffmpeg be easily installed on UBI 8 ?


Note : I tried referring to numerous references on the web that explain how that may be done, such as this one and this as well, but UBI seems to be working differently.


Syndiquer tout le site
