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Autres articles (76)
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Personnaliser les catégories
21 juin 2013, parFormulaire de création d’une catégorie
Pour ceux qui connaissent bien SPIP, une catégorie peut être assimilée à une rubrique.
Dans le cas d’un document de type catégorie, les champs proposés par défaut sont : Texte
On peut modifier ce formulaire dans la partie :
Administration > Configuration des masques de formulaire.
Dans le cas d’un document de type média, les champs non affichés par défaut sont : Descriptif rapide
Par ailleurs, c’est dans cette partie configuration qu’on peut indiquer le (...) -
Selection of projects using MediaSPIP
2 mai 2011, parThe examples below are representative elements of MediaSPIP specific uses for specific projects.
MediaSPIP farm @ Infini
The non profit organizationInfini develops hospitality activities, internet access point, training, realizing innovative projects in the field of information and communication technologies and Communication, and hosting of websites. It plays a unique and prominent role in the Brest (France) area, at the national level, among the half-dozen such association. Its members (...) -
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 (4503)
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FFMPEG Corrupt output remuxing MP4 (Using API in C) -First file OK, 2nd file onwards is not
25 janvier, par RichardPI have a simple application written in C - it takes the video from a RTSP camera and just writes to disk in 1 minute segments. The first file created works fine, plays on anlmost anything. The Second file does not play. Programatically, The trace shows they are the same code flows, but I cant seem to find where the problem is to allow the 2nd file to be play exactly the same as the first.


There are frames in the 2nd file but they are random. The second file is created EXACTLY the same way as the first.


Any help from a guru would be greatly appreciated.


EDIT : FIX - The output duration needs to be set before the trailer is written.


int actual_duration = (int)difftime(time(NULL), start_time);

for (int i = 0; i < output_ctx->nb_streams; i++) {
 output_ctx->streams[i]->duration = actual_duration * AV_TIME_BASE;
}

output_ctx->duration = actual_duration * AV_TIME_BASE;
printf("DURATION = %d\r\n",output_ctx->duration);

// Set the start_time for the output context
output_ctx->start_time = 0;

av_write_trailer(output_ctx);


Code flow


Open RTSP Stream 
A: Create File n context 
 Remux to file n 
 Wait for minute to change 
 Close File n context 
 increment n Goto A


Makefile


CC = gcc
CFLAGS = -Wall -g
LIBS = -lavformat -lavcodec -lavutil -lavdevice -lswscale -lavfilter -lavutil -lm -lz -lpthread

TARGET = rtsp_remux

all: $(TARGET)

$(TARGET): rtsp_remux.o
 $(CC) -o $(TARGET) rtsp_remux.o $(LIBS)

rtsp_remux.o: rtsp_remux.c
 $(CC) $(CFLAGS) -c rtsp_remux.c

clean:
 rm -f $(TARGET) rtsp_remux.o

.PHONY: all clean


rtsp_remux.c

#include <libavformat></libavformat>avformat.h>
#include <libavutil></libavutil>time.h>
#include 
#include 

#define OUTPUT_PREFIX "output"
#define OUTPUT_EXTENSION ".mp4"
#define MAX_FILES 4

int main(int argc, char *argv[]) {
 if (argc < 2) {
 fprintf(stderr, "Usage: %s <rtsp url="url">\n", argv[0]);
 return -1;
 }

 const char *rtsp_url = argv[1];
 AVFormatContext *input_ctx = NULL, *output_ctx = NULL;
 AVOutputFormat *output_fmt = NULL;
 AVPacket pkt;
 int ret, file_count = 0;
 char output_filename[1024];
 time_t current_time;
 struct tm *timeinfo;
 int rename_lock = 0;

 avformat_network_init();

 if ((ret = avformat_open_input(&input_ctx, rtsp_url, NULL, NULL)) < 0) {
 fprintf(stderr, "Could not open input file '%s'\n", rtsp_url);
 return -1;
 }

 if ((ret = avformat_find_stream_info(input_ctx, NULL)) < 0) {
 fprintf(stderr, "Failed to retrieve input stream information\n");
 return -1;
 }

 av_dump_format(input_ctx, 0, rtsp_url, 0);

 while (file_count < MAX_FILES) {
 snprintf(output_filename, sizeof(output_filename), "%s_%03d%s", OUTPUT_PREFIX, file_count, OUTPUT_EXTENSION);

 if ((ret = avformat_alloc_output_context2(&output_ctx, NULL, NULL, output_filename)) < 0) {
 fprintf(stderr, "Could not create output context\n");
 return -1;
 }

 output_fmt = output_ctx->oformat;

 for (int i = 0; i < input_ctx->nb_streams; i++) {
 AVStream *in_stream = input_ctx->streams[i];
 AVStream *out_stream = avformat_new_stream(output_ctx, NULL);
 if (!out_stream) {
 fprintf(stderr, "Failed allocating output stream\n");
 return -1;
 }

 if ((ret = avcodec_parameters_copy(out_stream->codecpar, in_stream->codecpar)) < 0) {
 fprintf(stderr, "Failed to copy codec parameters\n");
 return -1;
 }
 out_stream->codecpar->codec_tag = 0;
 }

 if (!(output_fmt->flags & AVFMT_NOFILE)) {
 if ((ret = avio_open(&output_ctx->pb, output_filename, AVIO_FLAG_WRITE)) < 0) {
 fprintf(stderr, "Could not open output file '%s'\n", output_filename);
 return -1;
 }
 }

 if ((ret = avformat_write_header(output_ctx, NULL)) < 0) {
 fprintf(stderr, "Error occurred when opening output file\n");
 return -1;
 }

 while (1) {
 current_time = time(NULL);
 timeinfo = localtime(&current_time);

 if (timeinfo->tm_sec == 0 && !rename_lock) {
 rename_lock = 1;
 break;
 } else if (timeinfo->tm_sec != 0) {
 rename_lock = 0;
 }

 if ((ret = av_read_frame(input_ctx, &pkt)) < 0)
 break;

 AVStream *in_stream = input_ctx->streams[pkt.stream_index];
 AVStream *out_stream = output_ctx->streams[pkt.stream_index];

 pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, out_stream->time_base, AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX);
 pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, out_stream->time_base, 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;

 if ((ret = av_interleaved_write_frame(output_ctx, &pkt)) < 0) {
 fprintf(stderr, "Error muxing packet\n");
 break;
 }

 av_packet_unref(&pkt);
 }

 av_write_trailer(output_ctx);

 if (!(output_fmt->flags & AVFMT_NOFILE))
 avio_closep(&output_ctx->pb);

 avformat_free_context(output_ctx);

 file_count++;
 }

 avformat_close_input(&input_ctx);
 avformat_network_deinit();

 return 0;
}
</rtsp>

I have tried changing to pointers, freeing and different things. I was expecting the 2nd file created to behave identically to the first.


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How to convert .srt file into ttml based xml subtitle file using ffmpeg ?
25 août 2023, par geo-freakI have an .srt subtitle file. I want to convert it into .ttml format(or xml) using ffmpeg command. I tried using traditional way to convert this. But ffmpeg throwing an error. Is there any way to convert this in Linux platform ? Or any other command line applications do this conversion ?


Below is the command I tried.


ffmpeg -i my_srt.srt -y srt-to-xml.xml -v verbose

ffmpeg version 4.2.4-1ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
configuration: --prefix=/usr --extra-version=1ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
libavutil 56. 31.100 / 56. 31.100
libavcodec 58. 54.100 / 58. 54.100
libavformat 58. 29.100 / 58. 29.100
libavdevice 58. 8.100 / 58. 8.100
libavfilter 7. 57.100 / 7. 57.100
libavresample 4. 0. 0 / 4. 0. 0
libswscale 5. 5.100 / 5. 5.100
libswresample 3. 5.100 / 3. 5.100
libpostproc 55. 5.100 / 55. 5.100
Input #0, srt, from 'my_srt.srt':
Duration: N/A, bitrate: N/A
 Stream #0:0: Subtitle: subrip
Output #0, webm_dash_manifest, to 'srt-to-xml.xml':
Output file #0 does not contain any stream
[AVIOContext @ 0x5614924ef500] Statistics: 22267 bytes read, 0 seeks


I even tried like below.


ffmpeg -i my_srt.srt -y srt_to_ttml.ttml


It didn't work too.


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OSError : [Errno 13] Permission denied with FFMPEG
14 février 2015, par jing yiI have just started using Python and am looking at using python to read mp3 files. I tried to use ffmpeg to read the mp3 file, however, i kept getting error of permission denied.
Appreciate if you could advise me on how to resolve this error !
Thank you !
$ cd '/Users/jingyi/Downloads/' && '/usr/bin/pythonw' '/Users/jingyi/Downloads/sound detection.py' && echo Exit status: $? && exit 1
Traceback (most recent call last):
File "/Users/jingyi/Downloads/sound detection.py", line 14, in <module>
pipe = sp.Popen(command, stdout = sp.PIPE)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 709, in __init__
errread, errwrite)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 1326, in _execute_child
raise child_exception
OSError: [Errno 13] Permission denied
</module>FFMPEG_BIN = '/Users/jingyi/Downloads/ffmpeg'
#INPUT_Sound = '/Users/jingyi/Downloads/Snore.mp3'
import subprocess as sp
command = [ FFMPEG_BIN,
'-i', '/Users/jingyi/Downloads/Snore.mp3',
'-f', 's16le',
'-acodec', 'pcm_s16le',
'-ar', '44100', # ouput will have 44100 Hz
'-ac', '2', # stereo (set to '1' for mono)
'-']
pipe = sp.Popen(command, stdout = sp.PIPE)
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