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SPIP - plugins - embed code - Exemple
2 September 2013, by
Updated: September 2013
Language: français
Type: Picture
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Keeping control of your media in your hands
13 April 2011, byThe 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 (...) -
Les images
15 May 2013 -
Taille des images et des logos définissables
9 February 2011, byDans beaucoup d’endroits du site, logos et images sont redimensionnées pour correspondre aux emplacements définis par les thèmes. L’ensemble des ces tailles pouvant changer d’un thème à un autre peuvent être définies directement dans le thème et éviter ainsi à l’utilisateur de devoir les configurer manuellement après avoir changé l’apparence de son site.
Ces tailles d’images sont également disponibles dans la configuration spécifique de MediaSPIP Core. La taille maximale du logo du site en pixels, on permet (...)
On other websites (7676)
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FFMPEG C Library: Encoding h264 stream into Matroska .mkv container creates corrupt files
16 March 2024, by Marvin KillingI want to use the FFMPEG C Library to create a Matroska Video .mkv file with only an h264 stream, but the resulting .mkv file comes out corrupt.


The file cannot be played back with Windows Media Player, ffplay, or VLC, and when I try to
ffprobe
the resulting file, these are the error messages:

[h264 @ 0000015060d8f5c0] No start code is found.
 Last message repeated 1 times
[h264 @ 0000015060d8f5c0] non-existing PPS 0 referenced
 Last message repeated 1 times
[h264 @ 0000015060d8f5c0] decode_slice_header error
[h264 @ 0000015060d8f5c0] no frame!
[h264 @ 0000015060d8f5c0] non-existing PPS 0 referenced
 Last message repeated 1 times
[h264 @ 0000015060d8f5c0] decode_slice_header error
[h264 @ 0000015060d8f5c0] no frame!
[h264 @ 0000015060d8f5c0] non-existing PPS 0 referenced
 Last message repeated 1 times
# [...]
# this continues for a long time



I have followed the other troubleshooting steps for encoding h264 into Matroska, but none of them seemed to have done the trick for me:


- 

- Setting
AV_CODEC_FLAG_GLOBAL_HEADER
: Invalid data when creating mkv container with h264 stream because extradata is null - Allocating some space for extradata: Initializing an output file for muxing mkv with FFmpeg






This is my C code:


#include 
#include <libavutil></libavutil>opt.h>
#include <libavutil></libavutil>imgutils.h>
#include <libavcodec></libavcodec>avcodec.h>
#include <libavformat></libavformat>avformat.h>

int main(void) {
 char *out_file_path = "./video.mkv";
 AVFormatContext *format_context;
 AVStream *video_stream;
 AVCodecContext *codec_context;

 avformat_alloc_output_context2(&format_context, NULL, NULL, out_file_path);

 const AVCodec *codec = avcodec_find_encoder(AV_CODEC_ID_H264);
 video_stream = avformat_new_stream(format_context, NULL);

 codec_context = avcodec_alloc_context3(codec);
 av_opt_set(codec_context->priv_data, "preset", "superfast", 0);
 av_opt_set(codec_context->priv_data, "crf", "22", 0);

 codec_context->width = 1920;
 codec_context->height = 1080;
 codec_context->time_base = av_make_q(1, 30);
 codec_context->pix_fmt = AV_PIX_FMT_YUV420P;

 if (strncmp("./video.mkv", out_file_path, 11) == 0) {
 printf("Writing .mkv...\n");
 codec_context->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
 codec_context->extradata = (uint8_t*)av_mallocz(1024 * 1024);
 codec_context->extradata_size = 1024 * 1024;
 } else {
 printf("Writing .mp4...\n");
 }

 // XXX avcodec_parameters_from_context is potentially superfluous (?)
 int ret = avcodec_parameters_from_context(video_stream->codecpar, codec_context);

 ret = avcodec_open2(codec_context, codec, NULL);

 avio_open(&format_context->pb, out_file_path, AVIO_FLAG_WRITE);

 ret = avformat_write_header(format_context, NULL);

 // create a black input frame
 AVFrame *input_frame = av_frame_alloc();
 input_frame->width = 1920;
 input_frame->height = 1080;
 input_frame->format = AV_PIX_FMT_YUV420P;
 ret = av_image_alloc(input_frame->data, input_frame->linesize, input_frame->width, input_frame->height, input_frame->format, 32);
 ptrdiff_t linesize[4] = { input_frame->linesize[0], input_frame->linesize[1], input_frame->linesize[2], input_frame->linesize[3] };
 ret = av_image_fill_black(input_frame->data, linesize, input_frame->format, 0, 1920, 1080);

 // write 2 seconds of video, all black
 for (size_t current_pts = 0; current_pts < 60; current_pts++) {
 input_frame->pts = av_rescale_q(current_pts, av_make_q(1, 30), codec_context->time_base);;

 ret = avcodec_send_frame(codec_context, input_frame);

 AVPacket* packet = av_packet_alloc();

 while (1) {
 ret = avcodec_receive_packet(codec_context, packet);
 if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
 break;
 } else if (ret < 0) {
 printf("avcodec_receive_packet failed");
 } else {
 av_packet_rescale_ts(packet, codec_context->time_base, video_stream->time_base);
 ret = av_interleaved_write_frame(format_context, packet);
 }
 }

 av_packet_free(&packet);
 }

 av_frame_free(&input_frame);

 // flush encoder
 avcodec_send_frame(codec_context, NULL);
 AVPacket *flush_packet = av_packet_alloc();
 while (avcodec_receive_packet(codec_context, flush_packet) != AVERROR_EOF) {
 //int ret = av_interleaved_write_frame(format_context_, packet);
 av_packet_rescale_ts(flush_packet, codec_context->time_base, video_stream->time_base);
 ret = av_write_frame(format_context, flush_packet);
 }
 av_packet_free(&flush_packet);

 ret = av_write_trailer(format_context);
 ret = avio_close(format_context->pb);

 return 0;
}



The error handling is stripped out, but it does not raise any errors.


This code works when I write into an mp4 file, but creates a corrupt file when writing into .mkv. You can change the output container format to mp4 by setting

char *out_file_path = "./video.mp4";


You can compile this by running


clang -I$(FFMPEG_DIR)/include -L$(FFMPEG_DIR)/lib -lavformat -lavcodec -lavutil main.c -o makemkv



The output I’m getting while the above code is running:


Writing .mkv...
[libx264 @ 0x139804c40] using cpu capabilities: ARMv8 NEON
[libx264 @ 0x139804c40] profile High, level 4.0, 4:2:0, 8-bit
[libx264 @ 0x139804c40] 264 - core 164 r3108 31e19f9 - H.264/MPEG-4 AVC codec - Copyleft 2003-2023 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x3:0x3 me=dia subme=1 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=15 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=1 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc=crf mbtree=0 crf=22.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 pb_ratio=1.30 aq=1:1.00



When I use the ffmpeg CLI, I can create a working .mkv from my working .mp4 like this:


ffmpeg -i video.mp4 -c:v copy created-with-ffmpeg-cli.mkv



I have uploaded the resulting video files here: https://drive.google.com/drive/folders/1FS-0fBAwKBbO-tyxC0VrFqcCyyqd0BR_?usp=sharing


- Setting
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ffmpeg with Quick Sync Video (qsv) gets stuck
28 April 2023, by Juliano B. NequiritoI've compiled
ffmpeg
in an Arch Linux distribution with support to Intel Quick Sync Video. Butffmpeg
gets stuck when I try to run it:

$ ffmpeg -debug -hwaccel qsv -qsv_device /dev/dri/renderD128 -c:v h264_qsv -i test_video.mp4 -c:v hevc_qsv output.mp4

ffmpeg version N-109562-g0431f9805e Copyright (c) 2000-2023 the FFmpeg developers
 built with gcc 12.2.0 (GCC)
 configuration: --prefix=/usr --extra-cflags=-I/opt/cuda/include --extra-ldflags=-L/opt/cuda/lib64 --enable-lto --disable-rpath --enable-gpl --enable-version3 --enable-nonfree --enable-shared --disable-static --disable-stripping --enable-gray --enable-alsa --enable-avisynth --enable-bzlib --enable-chromaprint --enable-frei0r --enable-gcrypt --enable-gmp --enable-gnutls --enable-iconv --enable-ladspa --enable-lcms2 --enable-libaom --enable-libaribb24 --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcelt --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libdavs2 --enable-libdc1394 --enable-libfdk-aac --enable-libflite --enable-fontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libiec61883 --enable-libilbc --enable-libjack --enable-libjxl --enable-libklvanc --enable-libkvazaar --enable-liblensfun --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-libopencv --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --disable-libopenvino --enable-libopus --enable-libplacebo --enable-libpulse --enable-librabbitmq --enable-librav1e --enable-librist --enable-librsvg --enable-librubberband --enable-librtmp --enable-libshine --enable-libsmbclient --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libsvthevc --enable-libsvtvp9 --disable-libtensorflow --enable-libtesseract --enable-libtheora --disable-libtls --enable-libtwolame --enable-libuavs3d --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxavs2 --enable-libxcb --enable-libxcb-shm --enable-libxcb-xfixes --enable-libxcb-shape --enable-libxvid --enable-libxml2 --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-lzma --enable-decklink --disable-mbedtls --enable-libmysofa --enable-openal --enable-opencl --enable-opengl --disable-openssl --enable-pocketsphinx --enable-sndio --enable-sdl2 --enable-vapoursynth --enable-vulkan --enable-xlib --enable-zlib --enable-amf --enable-cuda-nvcc --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-libdrm --enable-libvpl --enable-libnpp --enable-nvdec --enable-nvenc --enable-omx --enable-rkmpp --enable-v4l2-m2m --enable-vaapi --enable-vdpau
 libavutil 57. 43.100 / 57. 43.100
 libavcodec 59. 56.100 / 59. 56.100
 libavformat 59. 34.102 / 59. 34.102
 libavdevice 59. 8.101 / 59. 8.101
 libavfilter 8. 53.100 / 8. 53.100
 libswscale 6. 8.112 / 6. 8.112
 libswresample 4. 9.100 / 4. 9.100
 libpostproc 56. 7.100 / 56. 7.100
 matched as AVOption 'debug' with argument '-hwaccel'.
Reading option 'qsv' ... matched as output url.
Reading option '-qsv_device' ... matched as option 'qsv_device' (set QSV hardware device (DirectX adapter index, DRM path or X11 display name)) with argument '/dev/dri/renderD128'.
Reading option '-c:v' ... matched as option 'c' (codec name) with argument 'h264_qsv'.
Reading option '-i' ... matched as input url with argument 'test_video.mp4'.
Reading option '-c:v' ... matched as option 'c' (codec name) with argument 'hevc_qsv'.
Reading option 'output.mp4' ... matched as output url.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option qsv_device (set QSV hardware device (DirectX adapter index, DRM path or X11 display name)) with argument /dev/dri/renderD128.
[AVHWDeviceContext @ 0x5590d517ee40] libva: VA-API version 1.17.0
[AVHWDeviceContext @ 0x5590d517ee40] libva: User requested driver 'iHD'
[AVHWDeviceContext @ 0x5590d517ee40] libva: Trying to open /usr/lib/dri/iHD_drv_video.so
[AVHWDeviceContext @ 0x5590d517ee40] libva: Found init function __vaDriverInit_1_16
[AVHWDeviceContext @ 0x5590d517ee40] libva: va_openDriver() returns 0
[AVHWDeviceContext @ 0x5590d517ee40] Initialised VAAPI connection: version 1.17
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x41524742 -> bgra.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x42475241 -> argb.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x41424752 -> rgba.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x52474241 -> abgr.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x58524742 -> bgr0.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x42475258 -> 0rgb.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x58424752 -> rgb0.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x52474258 -> 0bgr.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x30335241 -> unknown.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x30334241 -> unknown.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x30335258 -> x2rgb10le.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x30334258 -> unknown.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x36314752 -> unknown.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x50424752 -> unknown.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x50524742 -> unknown.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x56555941 -> unknown.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x30303859 -> gray.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x3231564e -> nv12.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x3132564e -> unknown.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x32595559 -> yuyv422.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x59565955 -> uyvy422.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x32315659 -> yuv420p.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x30323449 -> yuv420p.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x50313134 -> yuv411p.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x48323234 -> yuv422p.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x56323234 -> yuv440p.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x50343434 -> yuv444p.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x33434d49 -> unknown.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x30313050 -> p010le.
[AVHWDeviceContext @ 0x5590d517ee40] VAAPI driver: Intel iHD driver for Intel(R) Gen Graphics - 22.6.4 ().
[AVHWDeviceContext @ 0x5590d517ee40] Driver not found in known nonstandard list, using standard behaviour.
[AVHWDeviceContext @ 0x5590d517e940] Use Intel(R) oneVPL to create MFX session, API version is 2.6, the required implementation version is 1.3



CPU starts being used intensively and then nothing happens.
Does anybody have any clue on it?


I have an Intel i7-8550U (8th gen Kaby Lake) processor with 4 cores (8 threads).


I have also used these options to
ffmpeg
, getting the same results:

ffmpeg -loglevel debug -init_hw_device qsv=hw -filter_hw_device hw -hwaccel qsv -hwaccel_output_format qsv -i test_video.mp4 -vf 'format=qsv,hwupload=extra_hw_frames=64' -c:v hevc_qsv -f mp4 output.mp4



With VAAPI, transcoding runs flowlessly:


ffmpeg -init_hw_device vaapi=intel:/dev/dri/renderD128 -hwaccel vaapi -hwaccel_output_format vaapi -hwaccel_device intel -filter_hw_device intel -i test_video.mp4 -c:v hevc_vaapi -f mp4 output.mp4



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Homepage Design: Best Practices & Examples
5 October 2022, by Erin