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Rennes Emotion Map 2010-11
19 octobre 2011, par
Mis à jour : Juillet 2013
Langue : français
Type : Texte
Autres articles (45)
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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 (...) -
Encoding and processing into web-friendly formats
13 avril 2011, parMediaSPIP automatically converts uploaded files to internet-compatible formats.
Video files are encoded in MP4, Ogv and WebM (supported by HTML5) and MP4 (supported by Flash).
Audio files are encoded in MP3 and Ogg (supported by HTML5) and MP3 (supported by Flash).
Where possible, text is analyzed in order to retrieve the data needed for search engine detection, and then exported as a series of image files.
All uploaded files are stored online in their original format, so you can (...) -
MediaSPIP 0.1 Beta version
25 avril 2011, parMediaSPIP 0.1 beta is the first version of MediaSPIP proclaimed as "usable".
The zip file provided here only contains the sources of MediaSPIP in its standalone version.
To get a working installation, you must manually install all-software dependencies on the server.
If you want to use this archive for an installation in "farm mode", you will also need to proceed to other manual (...)
Sur d’autres sites (9305)
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ffmpeg run from shell runs properly, but does not when called from within .NET
2 juillet 2013, par BevinI'm attempting to use ffmpeg (compiled on Windows with Cygwin) in a C# program, by using the
Process
class to spawn an ffmpeg instance. However, I've hit a rather odd bug that doesn't make much sense.When I run ffmpeg directly from a shell (be it Cygwin's bash, PowerShell, cmd), ffmpeg can properly decode and reencode files without any issues :
PS C:\audio> ffmpeg -i .\sound1.wav -acodec libvorbis -f ogg abc.ogg
ffmpeg version 1.2 Copyright (c) 2000-2013 the FFmpeg developers
built on Apr 8 2013 15:10:40 with gcc 4.5.3 (GCC)
configuration: --disable-encoder=vorbis --enable-libvorbis
libavutil 52. 18.100 / 52. 18.100
libavcodec 54. 92.100 / 54. 92.100
libavformat 54. 63.104 / 54. 63.104
libavdevice 54. 3.103 / 54. 3.103
libavfilter 3. 42.103 / 3. 42.103
libswscale 2. 2.100 / 2. 2.100
libswresample 0. 17.102 / 0. 17.102
[wav @ 0x800538a0] max_analyze_duration 5000000 reached at 5015510 microseconds
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, wav, from '.\sound1.wav':
Metadata:
encoder : Lavf54.63.104
Duration: 00:00:05.76, bitrate: 1411 kb/s
Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s
Output #0, ogg, to 'abc.ogg':
Metadata:
encoder : Lavf54.63.104
Stream #0:0: Audio: vorbis, 44100 Hz, stereo, fltp
Stream mapping:
Stream #0:0 -> #0:0 (pcm_s16le -> libvorbis)
Press [q] to stop, [?] for help
size= 55kB time=00:00:05.74 bitrate= 78.5kbits/s
video:0kB audio:51kB subtitle:0 global headers:4kB muxing overhead 0.817473%The file plays fine, and I can encode to WAV or any other format I like. However, when I call ffmpeg from C# with the following code :
string tempfile = Path.GetTempFileName();
FileStream tempfilestr = File.OpenWrite(tempfile);
input.CopyTo(tempfilestr);
ProcessStartInfo pstart = new ProcessStartInfo("ffmpeg", string.Format("-i \"{0}\" -v verbose -y -f wav -", tempfile));
pstart.CreateNoWindow = true;
pstart.ErrorDialog = false;
pstart.RedirectStandardOutput = true;
pstart.RedirectStandardError = true;
pstart.UseShellExecute = false;
Process proc = new Process();
proc.StartInfo = pstart;
proc.Start();
StreamReader stdout = proc.StandardOutput;
StreamReader stderr = proc.StandardError;
outtempfilestr = File.OpenRead(outtempfile);
MemoryStream output = new MemoryStream();
stdout.BaseStream.CopyTo(output);
try {
proc.Kill();
}
catch(InvalidOperationException) { }
catch(Win32Exception) { }
File.Delete(tempfile);
return output.ToArray();This randomly produces errors in the output :
ffmpeg version 1.2 Copyright (c) 2000-2013 the FFmpeg developers
built on Apr 8 2013 15:10:40 with gcc 4.5.3 (GCC)
configuration: --disable-encoder=vorbis --enable-libvorbis
libavutil 52. 18.100 / 52. 18.100
libavcodec 54. 92.100 / 54. 92.100
libavformat 54. 63.104 / 54. 63.104
libavdevice 54. 3.103 / 54. 3.103
libavfilter 3. 42.103 / 3. 42.103
libswscale 2. 2.100 / 2. 2.100
libswresample 0. 17.102 / 0. 17.102
[wav @ 0x80053860] parser not found for codec pcm_s16le, packets or times may be invalid.
Last message repeated 1 times
[wav @ 0x80053860] max_analyze_duration 5000000 reached at 5015510 microseconds
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, wav, from 'C:\Users\Bevin\AppData\Local\Temp\tmp1CCE.tmp':
Duration: 00:00:05.20, bitrate: 1411 kb/s
Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s
[graph 0 input from stream 0:0 @ 0x8011f320] tb:1/44100 samplefmt:s16 samplerate:44100 chlayout:0x3
Output #0, wav, to 'pipe:':
Metadata:
ISFT : Lavf54.63.104
Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (pcm_s16le -> pcm_s16le)
Press [q] to stop, [?] for help
Multiple frames in a packet from stream 0
[pcm_s16le @ 0x8005c160] Invalid PCM packet, data has size 3 but at least a size of 4 was expected
Error while decoding stream #0:0: Invalid data found when processing input
No more output streams to write to, finishing.
size= 896kB time=00:00:05.20 bitrate=1411.3kbits/s
video:0kB audio:896kB subtitle:0 global headers:0kB muxing overhead 0.008719%Note that these errors don't always occur. Sometimes they happen for certain files, sometimes they don't. I've tried various combinations of stream redirects and temp files, none of them work. I've also verified the integrity of the temp files, and it all checks out. I've even extracted the temp file before it was deleted, and decoded it in shell without a hitch.
Any ideas ?
Edit : I've tried running ffmpeg from a shell script that's run through C#. It gives the same issues. Compiling ffmpeg via MinGW gives the same issue as well.
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Damaged h264 stream not working with ffmpeg but working with vlc or mplayer
15 avril 2013, par gregoiregentilI have a h264 file, coming from an rtsp stream, that is slightly damaged. Some frames are altered.
ffmpeg reports :
ffmpeg -i stream.mpg
ffmpeg version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
built on Apr 2 2013 17:00:59 with gcc 4.6.3
*** THIS PROGRAM IS DEPRECATED ***
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
Seems stream 0 codec frame rate differs from container frame rate: 180000.00 (180000/1) -> 90000.00 (180000/2)
Input #0, mpegts, from 'a.mpg':
Duration: 00:03:18.84, start: 93370.745522, bitrate: 2121 kb/s
Program 1
Stream #0.0[0x44](): Video: h264 (Baseline), yuv420p, 640x480, 90k tbr, 90k tbn, 180k tbc
At least one output file must be specifiedI can play the file with VLC or mplayer. Obviously, the damaged frames are "kind of blurred" but it's working. mplayer reports :
mplayer stream.mpg
MPlayer2 UNKNOWN (C) 2000-2011 MPlayer Team
mplayer: could not connect to socket
mplayer: No such file or directory
Failed to open LIRC support. You will not be able to use your remote control.
Playing stream.mpg.
Detected file format: MPEG-2 transport stream format (libavformat)
[lavf] stream 0: video (h264), -vid 0
LAVF: Program 1
VIDEO: [H264] 640x480 0bpp 90000.000 fps 0.0 kbps ( 0.0 kbyte/s)
Load subtitles in .
[ass] auto-open
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Asking decoder to use 2 threads if supported.
Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264)
==========================================================================
Audio: no sound
Starting playback...
V: 0.0 0/ 0 ??% ??% ??,?% 0 0
Movie-Aspect is undefined - no prescaling applied.
VO: [xv] 640x480 => 640x480 Planar YV12
V:93370.7 0/ 0 ??% ??% ??,?% 0 0
No pts value from demuxer to use for frame!
Video pts after filters MISSING
V:93370.7 0/ 0 ??% ??% ??,?% 0 0
No pts value from demuxer to use for frame!
Video pts after filters MISSING
V:93370.7 0/ 0 ??% ??% ??,?% 0 0
No pts value from demuxer to use for frame!
Video pts after filters MISSING
V:93370.7 0/ 0 ??% ??% ??,?% 0 0
No pts value from demuxer to use for frame!
Video pts after filters MISSING
V:93370.7 0/ 0 ??% ??% ??,?% 0 0
No pts value from demuxer to use for frame!
Video pts after filters MISSING
V:93370.7 0/ 0 ??% ??% ??,?% 0 0
No pts value from demuxer to use for frame!
Video pts after filters MISSING
V:93370.7 0/ 0 ??% ??% ??,?% 0 0
No pts value from demuxer to use for frame!When I try to re-encode the file with :
ffmpeg -i stream.mpg -fflags +genpts -an -vcodec mpeg4 -r 65535/2733 stream.mp4
ffmpeg seems to jump over the altered frames. The length of stream.mp4 << length of stream.mpg
How could I fix this problem, i.e. having ffmpeg to output something similar to what mplayer and vlc output ?
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ffprobe or avprove returning plain text errors in JSON output
10 avril 2013, par Justin JenkinsI'm running
avprobe
to get stream infomation about a video inJSON
...avprobe -loglevel quiet -show_format -show_streams file.m4v -of json
This is basically the exact same thing as
ffprobe
orffmpeg -i
(and I get the same error.)ffprobe -loglevel quiet -show_format -show_streams file.m4v -print_format json
The command works most of the time ... however, on occation I'll have a video that has an odd stream in it that is "unsupported" and I'll get back something like this (abbreviated.)
Unsupported codec with id 94213 for input stream 2
{ "format" : {
"filename" : "file.m4v",
"nb_streams" : 3,
"format_name" : "mov,mp4,m4a,3gp,3g2,mj2" ...When I run the command I get back
JSON
+ an error inplain text
, which makes the result invalidJSON
and I have to "clean it up" later.I'm suppressing errors from the output
-loglevel quiet
but the error still show up.How can I tell
avprobe/ffprobe
to not show this error and hence get back a properJSON
object ?Longer Output Examples
ffprobe
, from source, MacOSffprobe version 0.9.1-subsplash, Copyright (c) 2007-2012 the FFmpeg developers
built on Feb 5 2012 01:35:36 with gcc 4.2.1 (Apple Inc. build 5664)
configuration: --prefix=/Volumes/Ramdisk/sw --as=yasm --extra-version=subsplash --disable-shared --enable-static --disable-ffplay --disable-ffserver --enable-gpl --enable-pthreads --enable-version3 --enable-libspeex --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libfaac --enable-libvorbis --enable-libtheora --enable-libx264 --enable-avfilter --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-filters --arch=x86_64 --enable-runtime-cpudetect --enable-nonfree
libavutil 51. 32. 0 / 51. 32. 0
libavcodec 53. 42. 4 / 53. 42. 4
libavformat 53. 24. 2 / 53. 24. 2
libavdevice 53. 4. 0 / 53. 4. 0
libavfilter 2. 53. 0 / 2. 53. 0
libswscale 2. 1. 0 / 2. 1. 0
libpostproc 51. 2. 0 / 51. 2. 0
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file.m4v':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42isomavc1
creation_time : 2012-01-01 06:38:43
encoder : HandBrake 0.9.5 2011010300
Duration: 00:30:47.53, start: 0.000000, bitrate: 1558 kb/s
Chapter #0.0: start -0.066733, end 17.784433
Metadata:
title : Chapter 1
...
Stream #0:2(und): Subtitle: mov_text (text / 0x74786574)
Metadata:
creation_time : 2012-01-01 06:38:43
handler_name :
Unsupported codec with id 94213 for input stream 2
{
...avprobe
, from source, Ubuntu Linuxavprobe version 10_alpha1-6:10~~git20130307.4be368b-1~quantal1, Copyright (c) 2007-2013 the Libav developers
built on Mar 7 2013 22:12:44 with gcc 4.7 (Ubuntu/Linaro 4.7.2-2ubuntu1)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file.m4v':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42isomavc1
creation_time : 2012-01-01 06:38:43
encoder : HandBrake 0.9.5 2011010300
Duration: 00:30:47.53, start: 0.000000, bitrate: 1558 kb/s
Chapter #0.0: start -0.066733, end 17.784433
Metadata:
title : Chapter 1
...
Stream #0.2(und): Subtitle: text / 0x74786574
Metadata:
creation_time : 2012-01-01 06:38:43
Unsupported codec with id 94213 for input stream 2
{
...