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Richard Stallman et le logiciel libre
19 octobre 2011, par
Mis à jour : Mai 2013
Langue : français
Type : Texte
Autres articles (102)
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Multilang : améliorer l’interface pour les blocs multilingues
18 février 2011, parMultilang est un plugin supplémentaire qui n’est pas activé par défaut lors de l’initialisation de MediaSPIP.
Après son activation, une préconfiguration est mise en place automatiquement par MediaSPIP init permettant à la nouvelle fonctionnalité d’être automatiquement opérationnelle. Il n’est donc pas obligatoire de passer par une étape de configuration pour cela. -
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. -
ANNEXE : Les plugins utilisés spécifiquement pour la ferme
5 mars 2010, parLe site central/maître de la ferme a besoin d’utiliser plusieurs plugins supplémentaires vis à vis des canaux pour son bon fonctionnement. le plugin Gestion de la mutualisation ; le plugin inscription3 pour gérer les inscriptions et les demandes de création d’instance de mutualisation dès l’inscription des utilisateurs ; le plugin verifier qui fournit une API de vérification des champs (utilisé par inscription3) ; le plugin champs extras v2 nécessité par inscription3 (...)
Sur d’autres sites (9999)
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Quickly split videos into parts with ffmpeg
20 avril 2021, par RewossKyI'm doing splitting on FFMPEG. I divide 1.5 hour videos into 30 minutes. I have two ways of partitioning, the first is the method of rendering by recodecing on the top, I do not have any problem in this, but the time is quite long despite the GTX 1660s graphics card and the ryzen5 3500x processor.


At the bottom, the time is short, but the first 3-4 seconds of the second part videos are frozen. Sometimes this causes problems like not reading in video editing programs.


With recodec (slow, no problem)
ffmpeg -i 1.mp4 -vcodec libx264 -crf 30 -ss 00:00:00 -t 00:29:30 s1.mp4
ffmpeg -i 1.mp4 -vcodec libx264 -crf 30 -ss 00:29:31 -t 00:29:30 s2.mp4
ffmpeg -i 1.mp4 -vcodec libx264 -crf 30 -ss 00:59:01 -t 00:29:30 s3.mp4
ffmpeg -i 1.mp4 -vcodec libx264 -crf 30 -ss 01:28:30 -t 00:29:30 s4.mp4


Without recodec (fast but have problem sometimes)
ffmpeg -i 1.mp4 -vcodec copy -ss 00:00:00 -t 00:29:30 s1.mp4
ffmpeg -i 1.mp4 -vcodec copy -ss 00:29:31 -t 00:29:30 s2.mp4
ffmpeg -i 1.mp4 -vcodec copy -ss 00:59:01 -t 00:29:30 s3.mp4
ffmpeg -i 1.mp4 -vcodec copy -ss 01:28:30 -t 00:29:30 s4.mp4


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Demuxing a video media file with FFMPEG
23 février 2016, par MOHWAfter starting this question Extracting the h264 part of a video file (demuxing) I was actually able to figure out that,
- When I reverted to an older version of FFMPEG (avcodec-55.dll) as against the avcodec-57.dll I was using earlier, the code worked perfectly without any error and the resultant h264 file played with ffplay.
- When I tracked my output when using the avcodec-57.dll version of FFMPEG (most recent version), there was actually an error
"Using AVStream.codec.time_base as a timebase hint to the muxer is deprecated. Set AVStream.time_base instead"after the callavformat_write_header(ofmt_ctx_v, NULL)and another one after the call toavformat_write_header(ofmt_ctx_a, NULL). The program continued executing, the audio was fine but the .h264 file wasn’t.
The output
Press any key to continue . . .
Press any key to continue . . .
Press any key to continue . . .
Press any key to continue . . .
==============Input Video=============
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'sample.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
title : 10153755968775490
encoder : Lavf57.19.100
Duration: 00:01:07.27, start: 0.020021, bitrate: 1058 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 400x224 [
SAR 199:200 DAR 199:112], 927 kb/s, 15 fps, 15 tbr, 15360 tbn, 30 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(eng): Audio: mp3 (mp4a / 0x6134706D), 48000 Hz, stereo, s16p, 12
8 kb/s (default)
Metadata:
handler_name : SoundHandler
==============Output Video============
Output #0, h264, to 'sample.h264':
Stream #0:0: Video: h264 (High), yuv420p, 400x224 [SAR 199:200 DAR 199:112],
q=2-31, 927 kb/s, 30 tbc
==============Output Audio============
Output #0, mp3, to 'sample.mp3':
Stream #0:0: Audio: mp3, 48000 Hz, stereo, s16p, 128 kb/s
======================================
[h264 @ 00a3ee20] Using AVStream.codec.time_base as a timebase hint to the muxer
is deprecated. Set AVStream.time_base instead.
[mp3 @ 00a4fec0] Using AVStream.codec.time_base as a timebase hint to the muxer
is deprecated. Set AVStream.time_base instead.
Press any key to continue . . .The code
#include
#define __STDC_CONSTANT_MACROS
extern "C"
{
#include "libavformat/avformat.h"
}
#define USE_H264BSF 1
int main()
{
AVOutputFormat *ofmt_a = NULL,*ofmt_v = NULL;
AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx_a = NULL, *ofmt_ctx_v = NULL;
AVPacket pkt;
int ret, i;
int videoindex=-1,audioindex=-1;
int frame_index=0;
const char *in_filename = "sample.mp4";
const char *out_filename_v = "sample.h264";
const char *out_filename_a = "sample.mp3";
av_register_all();
//Input
if ((ret = avformat_open_input(&ifmt_ctx, in_filename, 0, 0)) < 0) {
printf( "Could not open input file.");
goto end;
}
if ((ret = avformat_find_stream_info(ifmt_ctx, 0)) < 0) {
printf( "Failed to retrieve input stream information");
goto end;
}
system("pause");
//Output
avformat_alloc_output_context2(&ofmt_ctx_v, NULL, NULL, out_filename_v);
if (!ofmt_ctx_v) {
printf( "Could not create output context\n");
ret = AVERROR_UNKNOWN;
goto end;
}
ofmt_v = ofmt_ctx_v->oformat;
system("pause");
avformat_alloc_output_context2(&ofmt_ctx_a, NULL, NULL, out_filename_a);
if (!ofmt_ctx_a) {
printf( "Could not create output context\n");
ret = AVERROR_UNKNOWN;
goto end;
}
ofmt_a = ofmt_ctx_a->oformat;
system("pause");
for (i = 0; i < ifmt_ctx->nb_streams; i++) {
//Create output AVStream according to input AVStream
AVFormatContext *ofmt_ctx;
AVStream *in_stream = ifmt_ctx->streams[i];
AVStream *out_stream = NULL;
if(ifmt_ctx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO){
videoindex=i;
out_stream=avformat_new_stream(ofmt_ctx_v, in_stream->codec->codec);
ofmt_ctx=ofmt_ctx_v;
}else if(ifmt_ctx->streams[i]->codec->codec_type==AVMEDIA_TYPE_AUDIO){
audioindex=i;
out_stream=avformat_new_stream(ofmt_ctx_a, in_stream->codec->codec);
ofmt_ctx=ofmt_ctx_a;
}else{
break;
}
if (!out_stream) {
printf( "Failed allocating output stream\n");
ret = AVERROR_UNKNOWN;
goto end;
}
//Copy the settings of AVCodecContext
if (avcodec_copy_context(out_stream->codec, in_stream->codec) < 0) {
printf( "Failed to copy context from input to output stream codec context\n");
goto end;
}
out_stream->codec->codec_tag = 0;
if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
out_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
}
system("pause");
//Dump Format------------------
printf("\n==============Input Video=============\n");
av_dump_format(ifmt_ctx, 0, in_filename, 0);
printf("\n==============Output Video============\n");
av_dump_format(ofmt_ctx_v, 0, out_filename_v, 1);
printf("\n==============Output Audio============\n");
av_dump_format(ofmt_ctx_a, 0, out_filename_a, 1);
printf("\n======================================\n");
//Open output file
if (!(ofmt_v->flags & AVFMT_NOFILE)) {
if (avio_open(&ofmt_ctx_v->pb, out_filename_v, AVIO_FLAG_WRITE) < 0) {
printf( "Could not open output file '%s'", out_filename_v);
goto end;
}
}
if (!(ofmt_a->flags & AVFMT_NOFILE)) {
if (avio_open(&ofmt_ctx_a->pb, out_filename_a, AVIO_FLAG_WRITE) < 0) {
printf( "Could not open output file '%s'", out_filename_a);
goto end;
}
}
//Write file header
if (avformat_write_header(ofmt_ctx_v, NULL) < 0) {
printf( "Error occurred when opening video output file\n");
goto end;
}
if (avformat_write_header(ofmt_ctx_a, NULL) < 0) {
printf( "Error occurred when opening audio output file\n");
goto end;
}
system("pause");
#if USE_H264BSF
AVBitStreamFilterContext* h264bsfc = av_bitstream_filter_init("h264_mp4toannexb");
#endif
while (1) {
AVFormatContext *ofmt_ctx;
AVStream *in_stream, *out_stream;
//Get an AVPacket
if (av_read_frame(ifmt_ctx, &pkt) < 0)
break;
in_stream = ifmt_ctx->streams[pkt.stream_index];
if(pkt.stream_index==videoindex){
out_stream = ofmt_ctx_v->streams[0];
ofmt_ctx=ofmt_ctx_v;
#if USE_H264BSF
av_bitstream_filter_filter(h264bsfc, in_stream->codec, NULL, &pkt.data, &pkt.size, pkt.data, pkt.size, 0);
#endif
printf("Write Video Packet. size:%d\tpts:%lld\n",pkt.size,pkt.pts);
}else if(pkt.stream_index==audioindex){
out_stream = ofmt_ctx_a->streams[0];
ofmt_ctx=ofmt_ctx_a;
printf("Write Audio Packet. size:%d\tpts:%lld\n",pkt.size,pkt.pts);
}else{
continue;
}
//Convert PTS/DTS
pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, out_stream->time_base, (AVRounding)(AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, out_stream->time_base, (AVRounding)(AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
pkt.duration = av_rescale_q(pkt.duration, in_stream->time_base, out_stream->time_base);
pkt.pos = -1;
pkt.stream_index=0;
//Write
if (av_interleaved_write_frame(ofmt_ctx, &pkt) < 0) {
printf( "Error muxing packet\n");
break;
}
//printf("Write %8d frames to output file\n", frame_index);
av_free_packet(&pkt);
frame_index++;
}
system("pause");
#if USE_H264BSF
av_bitstream_filter_close(h264bsfc);
#endif
//Write file trailer
av_write_trailer(ofmt_ctx_a);
av_write_trailer(ofmt_ctx_v);
end:
avformat_close_input(&ifmt_ctx);
/* close output */
if (ofmt_ctx_a && !(ofmt_a->flags & AVFMT_NOFILE))
avio_close(ofmt_ctx_a->pb);
if (ofmt_ctx_v && !(ofmt_v->flags & AVFMT_NOFILE))
avio_close(ofmt_ctx_v->pb);
avformat_free_context(ofmt_ctx_a);
avformat_free_context(ofmt_ctx_v);
system("pause");
if (ret < 0 && ret != AVERROR_EOF) {
printf( "Error occurred.\n");
return -1;
}
return 0;
}EDIT 1
After reading through http://lists.libav.org/pipermail/libav-devel/2014-June/060048.html, I figured what was causing the"Using AVStream.codec.time_base as a timebase hint to the muxer is deprecated. Set AVStream.time_base instead". I fixed it by addingout_stream->time_base = in_stream->time_base;before the call toavformat_write_header. The code now runs without any error ! The h264 file created with the old FFMPEG (avcodec-55.dll) works fine while that created by the recent avcodec-57.dll is still invalid. -
C# FFMPEG : Code bugs out and stops producing media files
24 mai 2020, par HamezI've made a joke program in C# that uses ffmpeg to edit videos with different effects such as stuttering. I've finished 3 effects so far and each of them work on their own but as soon as I put one after another
e.g. fx.CrashStutter(0, 2); fx.CrashBeep(2, 2); fx.Wow(4, 2);
The code breaks and no longer produces photo/video files but once I stop debugging the file it was supposed to be processing appears. I've used a system where it loops over trying to execute a command to create a text file as a marker for when ffmpeg is done processing a file. The debug console also repeatedly says "The process tried to write to a nonexistent pipe."


Here's the code for all 3 effects :



public void Wow(double start, double duration)
 {
 if (fxstart == true)
 {
 //MessageBox.Show("WowFX Duration" + duration);
 string folderName = ("W_s" + start);
 System.Threading.Thread.Sleep(100);
 FXcmd.StandardInput.WriteLine("mkdir " + folderName);
 System.Threading.Thread.Sleep(100);
 FXcmd.StandardInput.WriteLine("cd " + folderName);
 System.Threading.Thread.Sleep(100);
 FXcmd.StandardInput.WriteLine("ffmpeg -ss " + start + " -t " + (duration / 6) + " -i " + source + " a.mp4");
 //wait until a.mp4 appears
 while (File.Exists("FxSource(Temporary)\\" + folderName + "\\a.txt") == false)
 {
 /*aha got a live one!*/FXcmd.StandardInput.WriteLine(" echo a > a.txt");
 System.Threading.Thread.Sleep(1500);
 }
 FXcmd.StandardInput.WriteLine("ffmpeg -i a.mp4 -vf reverse -af areverse b.mp4");
 //wait until b.mp4 appears
 while (File.Exists("FxSource(Temporary)\\" + folderName + "\\b.txt") == false)
 {
 FXcmd.StandardInput.WriteLine(" echo b > b.txt");
 System.Threading.Thread.Sleep(1500);
 }
 FXcmd.StandardInput.WriteLine("ffmpeg -ss " + start + " -t " + (duration / 3) + " -i " + source + " c.mp4");
 //wait until c.mp4 appears
 while (File.Exists("FxSource(Temporary)\\" + folderName + "\\c.txt") == false)
 {
 FXcmd.StandardInput.WriteLine(" echo c > c.txt");
 System.Threading.Thread.Sleep(1500);
 }
 FXcmd.StandardInput.WriteLine("ffmpeg -i c.mp4 -vf reverse -af areverse d.mp4");
 //wait until d.mp4 appears
 while (File.Exists("FxSource(Temporary)\\" + folderName + "\\d.txt") == false)
 {
 FXcmd.StandardInput.WriteLine(" echo d > d.txt");
 System.Threading.Thread.Sleep(1500);
 }
 string[] concatList = { "file 'a.mp4'", "file 'b.mp4'", "file 'c.mp4'", "file 'd.mp4'" };
 //FXcmd.StandardInput.Write("del a.txt, b.txt, c.txt, d.txt");
 //System.Threading.Thread.Sleep(1000);
 System.IO.File.WriteAllLines(("FxSource(Temporary)\\" + folderName + "\\concatList.txt"), concatList);
 System.Threading.Thread.Sleep(1500);
 FXcmd.StandardInput.WriteLine("ffmpeg -f concat -i concatList.txt -c copy " + folderName + ".mp4");
 while (File.Exists("FxSource(Temporary)\\" + folderName + "\\" + "1.txt") == false)
 {
 FXcmd.StandardInput.WriteLine(" echo 1 > 1.txt");
 System.Threading.Thread.Sleep(1500);
 }
 FXcmd.StandardInput.WriteLine("copy " + folderName + ".mp4 ..");
 while (File.Exists("FxSource(Temporary)\\" + folderName + ".mp4") == false)
 {
 System.Threading.Thread.Sleep(1500);
 }
 FXcmd.StandardInput.WriteLine("cd ..");
 System.Threading.Thread.Sleep(100);
 FXcmd.StandardInput.WriteLine("cls");
 FXcmd.StandardInput.Flush();
 }
 }
 public void CrashStutter(int start, int duration)
 {
 if (fxstart == true)
 {
 string folderName = ("Cs_s" + start);
 System.Threading.Thread.Sleep(100);
 FXcmd.StandardInput.WriteLine("mkdir " + folderName);
 System.Threading.Thread.Sleep(100);
 FXcmd.StandardInput.WriteLine("cd " + folderName);
 System.Threading.Thread.Sleep(100);
 FXcmd.StandardInput.WriteLine("ffmpeg -ss " + start + " -t 0.1" + " -i " + source + " a.mp4");
 System.Threading.Thread.Sleep(100);
 while (File.Exists("FxSource(Temporary)\\" + folderName + "\\a.txt") == false)
 {
 FXcmd.StandardInput.WriteLine(" echo a > a.txt");
 System.Threading.Thread.Sleep(1500);
 }
 FXcmd.StandardInput.WriteLine("ffmpeg -stream_loop "+10*duration+" -i a.mp4 "+folderName+".mp4");
 while (File.Exists("FxSource(Temporary)\\" + folderName + "\\" + "1.txt") == false)
 {
 FXcmd.StandardInput.WriteLine(" echo 1 > 1.txt");
 System.Threading.Thread.Sleep(1500);
 }
 FXcmd.StandardInput.WriteLine("copy " + folderName + ".mp4 ..");
 while (File.Exists("FxSource(Temporary)\\" + folderName + ".mp4") == false)
 {
 System.Threading.Thread.Sleep(1500);
 }
 FXcmd.StandardInput.WriteLine("cd ..");
 System.Threading.Thread.Sleep(100);
 FXcmd.StandardInput.WriteLine("cls");
 FXcmd.StandardInput.Flush();
 }
 }
 public void CrashBeep(int start, int duration)
 {
 //this effect cannot last longer than 7 seconds
 double contrast = 25;
 double red = 0.75;
 if (fxstart == true)
 {
 string folderName = ("Cb_s" + start);
 FXcmd.StandardInput.WriteLine("mkdir " + folderName);
 System.Threading.Thread.Sleep(100);
 FXcmd.StandardInput.WriteLine("cd " + folderName);
 System.Threading.Thread.Sleep(100);
 /*gets stuck*/FXcmd.StandardInput.WriteLine("ffmpeg -i "+source+ " -vf fps=1 a.jpg");
 System.Threading.Thread.Sleep(100);
 while (File.Exists("FxSource(Temporary)\\" + folderName + "\\a.txt") == false)
 {
 FXcmd.StandardInput.WriteLine(" echo a > a.txt");
 System.Threading.Thread.Sleep(1500);
 }
 FXcmd.StandardInput.WriteLine("ffmpeg -i a.jpg -vf eq=contrast="+contrast+" b.jpg");
 while (File.Exists("FxSource(Temporary)\\" + folderName + "\\b.txt") == false)
 {
 FXcmd.StandardInput.WriteLine(" echo b > b.txt");
 System.Threading.Thread.Sleep(1500);
 }
 FXcmd.StandardInput.WriteLine("ffmpeg -i b.jpg -vf colorbalance=rm=" + red + " c.jpg");
 while (File.Exists("FxSource(Temporary)\\" + folderName + "\\c.txt") == false)
 {
 FXcmd.StandardInput.WriteLine(" echo > c.txt");
 System.Threading.Thread.Sleep(1500);
 }
 FXcmd.StandardInput.WriteLine("ffmpeg -loop 1 -i c.jpg -c:v libx264 -t "+ duration +" -pix_fmt yuv420p -vf scale=1920:1080 d.mp4");
 while (File.Exists("FxSource(Temporary)\\" + folderName + "\\d.txt") == false)
 {
 FXcmd.StandardInput.WriteLine(" echo d > d.txt");
 System.Threading.Thread.Sleep(1500);
 }
 FXcmd.StandardInput.WriteLine("cd ..");
 System.Threading.Thread.Sleep(100);
 FXcmd.StandardInput.WriteLine("copy beep.mp3 "+folderName+"/beep.mp3");
 System.Threading.Thread.Sleep(100);
 FXcmd.StandardInput.WriteLine("cd "+folderName);
 System.Threading.Thread.Sleep(100);
 FXcmd.StandardInput.WriteLine("ffmpeg -i beep.mp3 -ss 0 -t " + duration + " e.mp3");
 while (File.Exists("FxSource(Temporary)\\" + folderName + "\\e.txt") == false)
 {
 FXcmd.StandardInput.WriteLine(" echo e > e.txt");
 System.Threading.Thread.Sleep(1500);
 }
 FXcmd.StandardInput.WriteLine("ffmpeg -i d.mp4 -i e.mp3 -c copy -map 0:v:0 -map 1:a:0 " + folderName + ".mp4");
 while (File.Exists("FxSource(Temporary)\\" + folderName + "\\" + "1.txt") == false)
 {
 FXcmd.StandardInput.WriteLine(" echo 1 > 1.txt");
 System.Threading.Thread.Sleep(1500);
 }
 FXcmd.StandardInput.WriteLine("copy " + folderName + ".mp4 ..");
 while (File.Exists("FxSource(Temporary)\\" + folderName + ".mp4") == false)
 {
 System.Threading.Thread.Sleep(1500);
 }
 FXcmd.StandardInput.WriteLine("cd ..");
 System.Threading.Thread.Sleep(100);
 FXcmd.StandardInput.WriteLine("cls");
 FXcmd.StandardInput.Flush();
 }
 }



Any suggestions ? Thanks !


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