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  • Participer à sa traduction

    10 avril 2011

    Vous pouvez nous aider à améliorer les locutions utilisées dans le logiciel ou à traduire celui-ci dans n’importe qu’elle nouvelle langue permettant sa diffusion à de nouvelles communautés linguistiques.
    Pour ce faire, on utilise l’interface de traduction de SPIP où l’ensemble des modules de langue de MediaSPIP sont à disposition. ll vous suffit de vous inscrire sur la liste de discussion des traducteurs pour demander plus d’informations.
    Actuellement MediaSPIP n’est disponible qu’en français et (...)

  • Publier sur MédiaSpip

    13 juin 2013

    Puis-je poster des contenus à partir d’une tablette Ipad ?
    Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir

  • Supporting all media types

    13 avril 2011, par

    Unlike most software and media-sharing platforms, MediaSPIP aims to manage as many different media types as possible. The following are just a few examples from an ever-expanding list of supported formats : images : png, gif, jpg, bmp and more audio : MP3, Ogg, Wav and more video : AVI, MP4, OGV, mpg, mov, wmv and more text, code and other data : OpenOffice, Microsoft Office (Word, PowerPoint, Excel), web (html, CSS), LaTeX, Google Earth and (...)

Sur d’autres sites (7629)

  • Crop MP3 to first 30 seconds

    2 décembre 2016, par Cheekysoft

    Original Question

    I want to be able to generate a new (fully valid) MP3 file from an existing MP3 file to be used as a preview — try-before-you-buy style. The new file should only contain the first n seconds of the track.

    Now, I know I could just "chop the stream" at n seconds (calculating from the bitrate and header size) when delivering the file, but this is a bit dirty and a real PITA on a VBR track. I’d like to be able to generate a proper MP3 file.

    Anyone any ideas ?

    Answers

    Both mp3split and ffmpeg are both good solutions. I chose ffmpeg as it is commonly installed on linux servers and is also easily available for windows. Here’s some more good command line parameters for generating previews with ffmpeg

    • -t <seconds></seconds> chop after specified number of seconds
    • -y force file overwrite
    • -ab <bitrate></bitrate> set bitrate e.g. -ab 96k
    • -ar <rate hz="hz"></rate> set sampling rate e.g. -ar 22050 for 22.05kHz
    • -map_meta_data <outfile>:<infile></infile></outfile> copy track metadata from infile to outfile

    instead of setting -ab and -ar, you can copy the original track settings, as Tim Farley suggests, with :

    • -acodec copy

  • GStreamer with MPEG-TS Video4Linux ATSC/DVB Recording

    21 juin 2013, par Dustin Oprea

    I'm having an impossible time setting up a filtergraph to read from a recording that I made from my DVB video4linux device. Any help would be vastly appreciated.

    How I made the recording :

    To tune the channel :

    azap -c ~/channels.conf "Florida"

    To record the channel :

    cat /dev/dvb/adapter0/dvr0 > /tmp/test

    This is the way that recordings must be made (I can not use any GST DVB plugins to do this for me).

    I used tstools to identify that the recording is a TS stream :

    tstools/bin$ ./stream_type ~/recordings/20130129-202049
    
Reading from /home/dustin/recordings/20130129-202049
    
It appears to be Transport Stream

    ...but that there are no PAT/PMT frames :

    tstools/bin$ ./tsinfo ~/recordings/20130129-202049
    
Reading from /home/dustin/recordings/20130129-202049
    
Scanning 10000 TS packets
    

    
Found 0 PAT packets and 0 PMT packets in 10000 TS packets

    I was able to produce a single ES (elementary stream) stream, by running ts2es :

    tstools/bin$ ./ts2es -pid 97 ~/recordings/20130129-202049 ~/recordings/20130129-202049.es
    
Reading from /home/dustin/recordings/20130129-202049
    
Writing to   /home/dustin/recordings/20130129-202049.es
    
Extracting packets for PID 0061 (97)
    
!!! 4 bytes ignored at end of file - not enough to make a TS packet
    
Extracted 219258 of 248113 TS packets

    I am able to play the ES stream (even though the video is frozen on the first frame) :

    gst-launch-0.10 filesrc location=~/recordings/20130129-202049.es ! decodebin2 ! autovideosink
    
gst-launch-0.10 filesrc location=~/recordings/20130129-202049.es ! decodebin2 ! xvimagesink
    
gst-launch-0.10 playbin2 uri=file:///home/dustin/recordings/20130129-202049.es

    No matter what I do, though, I can't get the original TS file to open. However, it opens in Mplayer/FFMPEG, perfectly (but not VLC). This is the output of FFMPEG :

    ffmpeg -i 20130129-202049
    

    
ffmpeg version 0.8.5-4:0.8.5-0ubuntu0.12.04.1, Copyright (c) 2000-2012 the Libav developers
    
  built on Jan 24 2013 18:03:14 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.
    
[mpeg2video @ 0x9be7be0] mpeg_decode_postinit() failure
    
    Last message repeated 4 times
    
[mpegts @ 0x9be3aa0] max_analyze_duration reached
    
[mpegts @ 0x9be3aa0] PES packet size mismatch
    
Input #0, mpegts, from &#39;20130129-202049&#39;:
    
  Duration: 00:03:39.99, start: 9204.168844, bitrate: 1696 kb/s
    
    Stream #0.0[0x61]: Video: mpeg2video (Main), yuv420p, 528x480 [PAR 40:33 DAR 4:3], 15000 kb/s, 30.57 fps, 29.97 tbr, 90k tbn, 59.94 tbc
    
    Stream #0.1[0x64]: Audio: ac3, 48000 Hz, stereo, s16, 192 kb/s
    
At least one output file must be specified

    This tells us that the video stream has PID 0x61 (97).

    I have been trying for a few days, so the following are only examples of a couple of attempts. I'll provide the playbin2 example first, since I know that thousands of people will respond, insisting that I just use that. It doesn't work.

    gst-launch-0.10 playbin2 uri=file:///home/dustin/recordings/20130129-202049
    

    
Setting pipeline to PAUSED ...
    
Pipeline is PREROLLING ...
    
ERROR: from element /GstPlayBin2:playbin20/GstURIDecodeBin:uridecodebin0/GstDecodeBin2:decodebin20/GstMpegTSDemux:mpegtsdemux0: Could not determine type of stream.
    
Additional debug info:
    
gstmpegtsdemux.c(2931): gst_mpegts_demux_sink_event (): /GstPlayBin2:playbin20/GstURIDecodeBin:uridecodebin0/GstDecodeBin2:decodebin20/GstMpegTSDemux:mpegtsdemux0:
    
No valid streams found at EOS
    
ERROR: pipeline doesn&#39;t want to preroll.
    
Setting pipeline to NULL ...
    
Freeing pipeline ...

    It fails [probably] because no PID has been specified with which to find the video (the "EOS" error, I think).

    Naturally, I tried the following to start by demuxing the TS format. I believe it's the "es-pids" property that receives the PID in the absence of PMT information (which tstools said there weren't any, above), but I tried "program-number", too, just in case. gst-inspect indicates that one is hex and the other is decimal :

    gst-launch-0.10 -v filesrc location=20130129-202049 ! mpegtsdemux es-pids=0x61 ! fakesink
    
gst-launch-0.10 -v filesrc location=20130129-202049 ! mpegtsdemux program-number=97 ! fakesink

    Output :

    gst-launch-0.10 filesrc location=20130129-202049 ! mpegtsdemux es-pids=0x61 ! fakesink
    
Setting pipeline to PAUSED ...
    
Pipeline is PREROLLING ...
    
ERROR: from element /GstPipeline:pipeline0/GstMpegTSDemux:mpegtsdemux0: Could not determine type of stream.
    
Additional debug info:
    
gstmpegtsdemux.c(2931): gst_mpegts_demux_sink_event (): /GstPipeline:pipeline0/GstMpegTSDemux:mpegtsdemux0:
    
No valid streams found at EOS
    
ERROR: pipeline doesn&#39;t want to preroll.
    
Setting pipeline to NULL ...
    
Freeing pipeline ...
    
dustin@dustinmicro:~/recordings$ gst-launch-0.10 -v filesrc location=20130129-202049 ! mpegtsdemux es-pids=0x61 ! fakesink
    
Setting pipeline to PAUSED ...
    
Pipeline is PREROLLING ...
    
ERROR: from element /GstPipeline:pipeline0/GstMpegTSDemux:mpegtsdemux0: Could not determine type of stream.
    
Additional debug info:
    
gstmpegtsdemux.c(2931): gst_mpegts_demux_sink_event (): /GstPipeline:pipeline0/GstMpegTSDemux:mpegtsdemux0:
    
No valid streams found at EOS
    
ERROR: pipeline doesn&#39;t want to preroll.
    
Setting pipeline to NULL ...
    
Freeing pipeline ...
    
dustin@dustinmicro:~/recordings$ gst-launch-0.10 -v filesrc location=20130129-202049 ! mpegtsdemux es-pids=0x61 ! fakesink
    
Setting pipeline to PAUSED ...
    
Pipeline is PREROLLING ...
    
ERROR: from element /GstPipeline:pipeline0/GstMpegTSDemux:mpegtsdemux0: Could not determine type of stream.
    
Additional debug info:
    
gstmpegtsdemux.c(2931): gst_mpegts_demux_sink_event (): /GstPipeline:pipeline0/GstMpegTSDemux:mpegtsdemux0:
    
No valid streams found at EOS
    
ERROR: pipeline doesn&#39;t want to preroll.
    
Setting pipeline to NULL ...
    
Freeing pipeline ...

    However, when I try mpegpsdemux (for program streams (PS), as opposed to transport streams (TS)), I get further :

    gst-launch-0.10 filesrc location=20130129-202049 ! mpegpsdemux ! fakesink
    

    
Setting pipeline to PAUSED ...
    
Pipeline is PREROLLING ...
    

    
(gst-launch-0.10:14805): GStreamer-CRITICAL **: gst_event_new_new_segment_full: assertion `position != -1&#39; failed
    

    
(gst-launch-0.10:14805): GStreamer-CRITICAL **: gst_mini_object_ref: assertion `mini_object != NULL&#39; failed
    

    
(gst-launch-0.10:14805): GStreamer-CRITICAL **: gst_pad_push_event: assertion `event != NULL&#39; failed
    
Pipeline is PREROLLED ...
    
Setting pipeline to PLAYING ...
    
New clock: GstSystemClock
    

    
(gst-launch-0.10:14805): GStreamer-CRITICAL **: gst_event_new_new_segment_full: assertion `position != -1&#39; failed
    

    
(gst-launch-0.10:14805): GStreamer-CRITICAL **: gst_mini_object_ref: assertion `mini_object != NULL&#39; failed
    

    
(gst-launch-0.10:14805): GStreamer-CRITICAL **: gst_pad_push_event: assertion `event != NULL&#39; failed
    

    
(gst-launch-0.10:14805): GStreamer-CRITICAL **: gst_event_new_new_segment_full: assertion `position != -1&#39; failed
    

    
(gst-launch-0.10:14805): GStreamer-CRITICAL **: gst_mini_object_ref: assertion `mini_object != NULL&#39; failed
    

    
(gst-launch-0.10:14805): GStreamer-CRITICAL **: gst_pad_push_event: assertion `event != NULL&#39; failed
    

    
(gst-launch-0.10:14805): GStreamer-CRITICAL **: gst_event_new_new_segment_full: assertion `position != -1&#39; failed
    

    
(gst-launch-0.10:14805): GStreamer-CRITICAL **: gst_mini_object_ref: assertion `mini_object != NULL&#39; failed
    

    
(gst-launch-0.10:14805): GStreamer-CRITICAL **: gst_pad_push_event: assertion `event != NULL&#39; failed
    

    

    
...
    

    

    
Got EOS from element "pipeline0".
    
Execution ended after 1654760008 ns.
    
Setting pipeline to PAUSED ...
    
Setting pipeline to READY ...
    
Setting pipeline to NULL ...
    
Freeing pipeline ...

    I'll still get the same problem whenever I use the mpegtsdemux, even if it follows mpegpsdemux, above.

    I don't understand this, since I haven't even picked a PID yet.

    What am I doing wrong ?

    Dustin

  • ffmpeg trying to remove the first few seconds of video

    21 octobre 2011, par zeroasterisk

    I'm trying to remove a few seconds off the front of a video stream (audio already excluded), and I'm getting strange results : I would think that for every second I increase -ss by, the resulting file would be a second shorter... that doesn't seem to be the case.

    original     ==> 01:04:52.84
    
-ss 19       ==> 01:04:42.84 (diff = 10) [command history shown below]
    
-ss 20       ==> 01:04:32.84 (diff = 20) [command history shown below]
    
-ss 21       ==> 01:04:32.84 (diff = 20)
    
-ss 25       ==> 01:04:32.84 (diff = 20)
    
-ss 0:0:25.0 ==> 01:04:32.84 (diff = 20)
    
-ss 0:0:25.5 ==> 01:04:32.84 (diff = 20) [command history shown below]

    Command : ffmpeg -ss # -i temp.mp4 -y -vcodec copy  temp_croppedFromStart.mp4

    Here's the command history for 19 & 20

    # ffmpeg -ss 19 -i temp.mp4 -y -vcodec copy  temp_croppedFromStart.mp4; ffmpeg -i temp.mp4 2>&amp;1 | grep Duration; ffmpeg -i temp_croppedFromStart.mp4 2>&amp;1 | grep Duration
    
ffmpeg version N-31809-g9acffed, Copyright (c) 2000-2011 the FFmpeg developers
    
  built on Aug 10 2011 21:25:11 with gcc 4.4.5
    
  configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-x11grab
    
  libavutil    51. 11. 1 / 51. 11. 1
    
  libavcodec   53. 10. 0 / 53. 10. 0
    
  libavformat  53.  6. 0 / 53.  6. 0
    
  libavdevice  53.  2. 0 / 53.  2. 0
    
  libavfilter   2. 28. 1 /  2. 28. 1
    
  libswscale    2.  0. 0 /  2.  0. 0
    
  libpostproc  51.  2. 0 / 51.  2. 0
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from &#39;temp.mp4&#39;:
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    creation_time   : 1970-01-01 00:00:00
    
    encoder         : Lavf53.6.0
    
  Duration: 01:04:52.84, start: 0.000000, bitrate: 553 kb/s
    
    Stream #0.0(und): Video: h264 (Constrained Baseline), yuv420p, 960x640, 552 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc
    
    Metadata:
    
      creation_time   : 1970-01-01 00:00:00
    
Output #0, mp4, to &#39;temp_croppedFromStart.mp4&#39;:
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    creation_time   : 1970-01-01 00:00:00
    
    encoder         : Lavf53.6.0
    
    Stream #0.0(und): Video: libx264, yuv420p, 960x640, q=2-31, 552 kb/s, 25 tbn, 25 tbc
    
    Metadata:
    
      creation_time   : 1970-01-01 00:00:00
    
Stream mapping:
    
  Stream #0.0 -> #0.0
    
Press [q] to stop, [?] for help
    
frame=97071 fps=42523 q=-1.0 Lsize=  262684kB time=01:04:33.84 bitrate= 555.5kbits/s
    
video:261923kB audio:0kB global headers:0kB muxing overhead 0.290418%
    
  Duration: 01:04:52.84, start: 0.000000, bitrate: 553 kb/s
    
  Duration: 01:04:42.84, start: 0.000000, bitrate: 554 kb/s
    

    

    
# ffmpeg -ss 20 -i temp.mp4 -y -vcodec copy  temp_croppedFromStart.mp4; ffmpeg -i temp.mp4 2>&amp;1 | grep Duration; ffmpeg -i temp_croppedFromStart.mp4 2>&amp;1 | grep Duration
    
ffmpeg version N-31809-g9acffed, Copyright (c) 2000-2011 the FFmpeg developers
    
  built on Aug 10 2011 21:25:11 with gcc 4.4.5
    
  configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-x11grab
    
  libavutil    51. 11. 1 / 51. 11. 1
    
  libavcodec   53. 10. 0 / 53. 10. 0
    
  libavformat  53.  6. 0 / 53.  6. 0
    
  libavdevice  53.  2. 0 / 53.  2. 0
    
  libavfilter   2. 28. 1 /  2. 28. 1
    
  libswscale    2.  0. 0 /  2.  0. 0
    
  libpostproc  51.  2. 0 / 51.  2. 0
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from &#39;temp.mp4&#39;:
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    creation_time   : 1970-01-01 00:00:00
    
    encoder         : Lavf53.6.0
    
  Duration: 01:04:52.84, start: 0.000000, bitrate: 553 kb/s
    
    Stream #0.0(und): Video: h264 (Constrained Baseline), yuv420p, 960x640, 552 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc
    
    Metadata:
    
      creation_time   : 1970-01-01 00:00:00
    
Output #0, mp4, to &#39;temp_croppedFromStart.mp4&#39;:
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    creation_time   : 1970-01-01 00:00:00
    
    encoder         : Lavf53.6.0
    
    Stream #0.0(und): Video: libx264, yuv420p, 960x640, q=2-31, 552 kb/s, 25 tbn, 25 tbc
    
    Metadata:
    
      creation_time   : 1970-01-01 00:00:00
    
Stream mapping:
    
  Stream #0.0 -> #0.0
    
Press [q] to stop, [?] for help
    
frame=96821 fps=47168 q=-1.0 Lsize=  262003kB time=01:04:32.84 bitrate= 554.2kbits/s
    
video:261244kB audio:0kB global headers:0kB muxing overhead 0.290410%
    
  Duration: 01:04:52.84, start: 0.000000, bitrate: 553 kb/s
    
  Duration: 01:04:32.84, start: 0.000000, bitrate: 554 kb/s
    

    
# ffmpeg -ss 0:0:25.5 -i temp.mp4 -y -vcodec copy  temp_croppedFromStart.mp4; ffmpeg -i temp.mp4 2>&amp;1 | grep Duration; ffmpeg -i temp_croppedFromStart.mp4 2>&amp;1 | grep Duration
    
ffmpeg version N-31809-g9acffed, Copyright (c) 2000-2011 the FFmpeg developers
    
  built on Aug 10 2011 21:25:11 with gcc 4.4.5
    
  configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-x11grab
    
  libavutil    51. 11. 1 / 51. 11. 1
    
  libavcodec   53. 10. 0 / 53. 10. 0
    
  libavformat  53.  6. 0 / 53.  6. 0
    
  libavdevice  53.  2. 0 / 53.  2. 0
    
  libavfilter   2. 28. 1 /  2. 28. 1
    
  libswscale    2.  0. 0 /  2.  0. 0
    
  libpostproc  51.  2. 0 / 51.  2. 0
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from &#39;temp.mp4&#39;:
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    creation_time   : 1970-01-01 00:00:00
    
    encoder         : Lavf53.6.0
    
  Duration: 01:04:52.84, start: 0.000000, bitrate: 553 kb/s
    
    Stream #0.0(und): Video: h264 (Constrained Baseline), yuv420p, 960x640, 552 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc
    
    Metadata:
    
      creation_time   : 1970-01-01 00:00:00
    
Output #0, mp4, to &#39;temp_croppedFromStart.mp4&#39;:
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    creation_time   : 1970-01-01 00:00:00
    
    encoder         : Lavf53.6.0
    
    Stream #0.0(und): Video: libx264, yuv420p, 960x640, q=2-31, 552 kb/s, 25 tbn, 25 tbc
    
    Metadata:
    
      creation_time   : 1970-01-01 00:00:00
    
Stream mapping:
    
  Stream #0.0 -> #0.0
    
Press [q] to stop, [?] for help
    
frame=96821 fps=45920 q=-1.0 Lsize=  262003kB time=01:04:27.32 bitrate= 555.0kbits/s
    
video:261244kB audio:0kB global headers:0kB muxing overhead 0.290424%
    
  Duration: 01:04:52.84, start: 0.000000, bitrate: 553 kb/s
    
  Duration: 01:04:32.84, start: 0.000000, bitrate: 554 kb/s

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