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Qualité du média après traitement
21 juin 2013, parLe bon réglage du logiciel qui traite les média est important pour un équilibre entre les partis ( bande passante de l’hébergeur, qualité du média pour le rédacteur et le visiteur, accessibilité pour le visiteur ). Comment régler la qualité de son média ?
Plus la qualité du média est importante, plus la bande passante sera utilisée. Le visiteur avec une connexion internet à petit débit devra attendre plus longtemps. Inversement plus, la qualité du média est pauvre et donc le média devient dégradé voire (...) -
Des sites réalisés avec MediaSPIP
2 mai 2011, parCette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page. -
MediaSPIP : Modification des droits de création d’objets et de publication définitive
11 novembre 2010, parPar défaut, MediaSPIP permet de créer 5 types d’objets.
Toujours par défaut les droits de création et de publication définitive de ces objets sont réservés aux administrateurs, mais ils sont bien entendu configurables par les webmestres.
Ces droits sont ainsi bloqués pour plusieurs raisons : parce que le fait d’autoriser à publier doit être la volonté du webmestre pas de l’ensemble de la plateforme et donc ne pas être un choix par défaut ; parce qu’avoir un compte peut servir à autre choses également, (...)
Sur d’autres sites (9373)
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How to merge a segmented webvtt subtitle file and output a single srt file ?
24 janvier 2019, par DobbelinaHow to merge a segmented webvtt subtitle file and output a single srt file ?,
m3u8 looks like this example :#EXTM3U
#EXT-X-VERSION:4
#EXT-X-PLAYLIST-TYPE:VOD
#EXT-X-MEDIA-SEQUENCE:1
#EXT-X-INDEPENDENT-SEGMENTS
#EXT-X-TARGETDURATION:4
#USP-X-TIMESTAMP-MAP:MPEGTS=900000,LOCAL=1970-01-01T00:00:00Z
#EXTINF:4, no desc
0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-1.webvtt
#EXTINF:4, no desc
0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-2.webvtt
#EXTINF:4, no desc
0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-3.webvtt
#EXTINF:4, no desc
0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-4.webvtt
#EXTINF:4, no desc
0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-5.webvtt
#EXTINF:4, no desc
0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-6.webvtt
#EXT-X-ENDLISTI noticed that each segment is not synchronized/cued against total playing time, but against the individual ts segments.
If ffmpeg could be used to do this, what magic input do i need to give it ?A single correctly cued vtt file would work to.
Thanks for any replies you lovely people ! -
Could not find codec parameters for stream 0
14 avril 2017, par khinesterWhen I run this command :
ffmpeg -y -i ./in.mp4 -c:v png -f image2pipe -thread_queue_size 1024 -r 25 -t 186.75 -i - -filter_complex overlay=0:0 -c:v libx264 -pix_fmt yuv420p -movflags +faststart ./out.mp4 < ./out.png
I get an error :
(git)-[master]
ffmpeg version 2.8.11-0ubuntu0.16.04.1 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
WARNING: library configuration mismatch
avcodec configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv --enable-version3 --disable-doc --disable-programs --disable-avdevice --disable-avfilter --disable-avformat --disable-avresample --disable-postproc --disable-swscale --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libvo_aacenc --enable-libvo_amrwbenc
libavutil 54. 31.100 / 54. 31.100
libavcodec 56. 60.100 / 56. 60.100
libavformat 56. 40.101 / 56. 40.101
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 40.101 / 5. 40.101
libavresample 2. 1. 0 / 2. 1. 0
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 2.101 / 1. 2.101
libpostproc 53. 3.100 / 53. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from './in.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
creation_time : 1970-01-01 00:00:00
encoder : Lavf52.99.1
Duration: 00:03:06.75, start: 0.000000, bitrate: 538 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 480x320 [SAR 1:1 DAR 3:2], 465 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc (default)
Metadata:
creation_time : 1970-01-01 00:00:00
handler_name : VideoHandler
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 67 kb/s (default)
Metadata:
creation_time : 1970-01-01 00:00:00
handler_name : SoundHandler
[image2pipe @ 0x15f7200] Could not find codec parameters for stream 0 (Video: png, none(pc)): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options
pipe:: could not find codec parameters
Input #1, image2pipe, from 'pipe:':
Duration: N/A, bitrate: N/A
Stream #1:0: Video: png, none(pc), 25 tbr, 25 tbn, 25 tbc
[buffer @ 0x15e2620] Unable to parse option value "0x0" as image size
[buffer @ 0x15e2620] Unable to parse option value "-1" as pixel format
[buffer @ 0x15e2620] Unable to parse option value "0x0" as image size
[buffer @ 0x15e2620] Error setting option video_size to value 0x0.
[graph 0 input from stream 1:0 @ 0x15e23e0] Error applying options to the filter.
Error configuring complex filters.
Invalid argument
Consider increasing the value for the 'analyzeduration' and 'probesize' options pipe:0: could not find codec parametersWhat am I missing in my setup ?
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ffmpeg failed to call avcodec_send_packet
23 juin 2017, par GizakWindows 10 x64,
ffmpeg : 3.1, prebuilt dllsAbsolute beginner here.
I was trying out a very basic case to decode frames from a video file but desperately failed at every attempts. The final code snippet looks like this :
#define __STDC_CONSTANT_MACROS
extern "C" {
#include<libavutil></libavutil>avutil.h>
#include<libavutil></libavutil>imgutils.h>
#include <libavformat></libavformat>avformat.h>
#include <libavcodec></libavcodec>avcodec.h>
#include <libswscale></libswscale>swscale.h>
}
#include <iostream>
int main(int argc, char **argv) {
AVFormatContext* ctx_format = nullptr;
AVCodecContext* ctx_codec = nullptr;
AVCodec* codec = nullptr;
AVFrame* frame = av_frame_alloc();
int stream_idx;
SwsContext* ctx_sws = nullptr;
const char* fin = argv[1];
AVStream *vid_stream = nullptr;
AVPacket* pkt = av_packet_alloc();
av_register_all();
if (int ret = avformat_open_input(&ctx_format, fin, nullptr, nullptr) != 0) {
std::cout << 1 << std::endl;
return ret;
}
if (avformat_find_stream_info(ctx_format, nullptr) < 0) {
std::cout << 2 << std::endl;
return -1; // Couldn't find stream information
}
av_dump_format(ctx_format, 0, fin, false);
for (int i = 0; i < ctx_format->nb_streams; i++)
if (ctx_format->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
stream_idx = i;
vid_stream = ctx_format->streams[i];
break;
}
if (vid_stream == nullptr) {
std::cout << 4 << std::endl;
return -1;
}
codec = avcodec_find_decoder(vid_stream->codecpar->codec_id);
if (!codec) {
fprintf(stderr, "codec not found\n");
exit(1);
}
ctx_codec = avcodec_alloc_context3(codec);
if(avcodec_parameters_to_context(ctx_codec, vid_stream->codecpar)<0)
std::cout << 512;
if (avcodec_open2(ctx_codec, codec, nullptr)<0) {
std::cout << 5;
return -1;
}
//av_new_packet(pkt, pic_size);
while(av_read_frame(ctx_format, pkt) >= 0){
int ret = avcodec_send_packet(ctx_codec, pkt);
if (ret < 0 || ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
std::cout << "avcodec_send_packet: " << ret << std::endl;
break;
}
if (pkt->stream_index == stream_idx) {
while (ret >= 0) {
ret = avcodec_receive_frame(ctx_codec, frame);
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
//std::cout << "avcodec_receive_frame: " << ret << std::endl;
break;
}
std::cout << "frame: " << ctx_codec->frame_number << std::endl;
}
}
av_packet_unref(pkt);
}
avformat_close_input(&ctx_format);
av_packet_unref(pkt);
avcodec_free_context(&ctx_codec);
avformat_free_context(ctx_format);
return 0;
}
</iostream>It basically leaves everything by its defaults and try to read packets and decode frames from them. The
avcodec_send_packet
always returned a negative value at the first or second round of calling in the while loop.Output for flv :
> .\streamer_test.exe .\SampleVideo_360x240_5mb.flv
Input #0, flv, from '.\SampleVideo_360x240_5mb.flv':
Metadata:
encoder : Lavf53.24.2
Duration: 00:00:53.32, start: 0.000000, bitrate: 787 kb/s
Stream #0:0: Audio: aac (LC), 48000 Hz, 5.1, fltp, 384 kb/s
Stream #0:1: Video: flv1, yuv420p, 320x240, 500 kb/s, 1k fps, 25 tbr, 1k tbn
frame: 1
[flv @ 000001545edb66c0] Bad picture start code
[flv @ 000001545edb66c0] header damaged
avcodec_send_packet: -1094995529Output for mp4 :
> .\streamer_test.exe .\SampleVideo_360x240_10mb.mp4
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '.\SampleVideo_360x240_10mb.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
creation_time : 1970-01-01T00:00:00.000000Z
encoder : Lavf53.24.2
Duration: 00:02:05.95, start: 0.000000, bitrate: 669 kb/s
Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 320x240 [SAR 1:1 DAR 4:3], 282 kb/s, 15 fps, 15 t
br, 15360 tbn, 30 tbc (default)
Metadata:
creation_time : 1970-01-01T00:00:00.000000Z
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 383 kb/s (default)
Metadata:
creation_time : 1970-01-01T00:00:00.000000Z
handler_name : SoundHandler
[h264 @ 000002e2446a6cc0] Invalid NAL unit size (17191968 > 1007).
[h264 @ 000002e2446a6cc0] Error splitting the input into NAL units.
avcodec_send_packet: -1094995529Output for mkv :
> .\streamer_test.exe .\SampleVideo_1280x720_2mb.mkv
Input #0, matroska,webm, from '.\SampleVideo_1280x720_2mb.mkv':
Metadata:
ENCODER : Lavf53.24.2
Duration: 00:00:10.65, bitrate: 1575 kb/s
Stream #0:0: Video: mpeg4 (Simple Profile), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 1k tbn, 25 tbc (de
fault)
Stream #0:1: Audio: aac (LC), 48000 Hz, 5.1, fltp (default)
frame: 1
[mpeg4 @ 000001166798ede0] header damaged
avcodec_send_packet: -1So I guess there must be something wrong around
avcodec_send_packet
call but could not figured out what is missing. Any ideas about the causes ? Much appreciate your help !