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  • Emballe médias : à quoi cela sert ?

    4 février 2011, par

    Ce plugin vise à gérer des sites de mise en ligne de documents de tous types.
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  • Installation en mode ferme

    4 février 2011, par

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    Dans un premier temps, vous devez avoir installé les mêmes fichiers que l’installation (...)

  • Creating farms of unique websites

    13 avril 2011, par

    MediaSPIP platforms can be installed as a farm, with a single "core" hosted on a dedicated server and used by multiple websites.
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  • FFMPEG to create an MPEG-DASH stream with VP8

    24 avril 2017, par Kenneth Worden

    I’m trying to use FFMPEG to stream a live video feed from my webcam /dev/video0. Following scattered tutorials and scarce documentation (is this a known problem for the encoding community ?) I arrived at the following bash script :

    #!/bin/bash
    

    
ffmpeg \
    
    -y \
    
    -f v4l2 \
    
        -i /dev/video0 \
    
        -s 640x480 \
    
        -input_format mjpeg \
    
        -r 24 \
    
    -map 0:0 \
    
    -pix_fmt yuv420p \
    
    -codec:v libvpx \
    
        -s 640x480 \
    
        -threads 4 \
    
        -b:v 50k \
    
        -tile-columns 4 \
    
        -frame-parallel 1 \
    
        -keyint_min 24 -g 24 \
    
    -f webm_chunk \
    
        -header "stream.hdr" \
    
        -chunk_start_index 1 \
    
    stream_%d.chk &
    

    
sleep 2
    

    
ffmpeg \
    
    -f webm_dash_manifest -live 1 \
    
    -i stream.hdr \
    
    -c copy \
    
    -map 0 \
    
    -f webm_dash_manifest -live 1 \
    
        -adaptation_sets "id=0,streams=0" \
    
        -chunk_start_index 1 \
    
        -chunk_duration_ms 1000 \
    
        -time_shift_buffer_depth 30000 \
    
        -minimum_update_period 60000 \
    
    stream_manifest.mpd

    When I run this script, my webcam light turns on, the stream.hdr and stream_manifest.mpd files are written, and chunks start to be created (i.e. stream_1.chk, stream_2.chk, etc...). However, FFMPEG throws the following error :

    Could not write header for output file #0 (incorrect codec parameters
     ?) : Invalid data found when processing input

    I will explain what I think I am doing with this script, and hopefully this will expose any errors in my thinking.

    First, we invoke FFMPEG to use Video for Linux 2 (v4l2) to read from my webcam (/dev/video0) of a resolution 640x480. The input format is mjpeg with a framerate of 24fps.

    I then declare that FFMPEG should "map" (copy) the video stream output by v4l2 to a file. I specify the pixel format (YUV420P) and use libvpx (VP8 encoding) to encode the video stream. I set the size to be 640x480, use 4 threads, set the bitrate to be 50kbps, do some magic with tile-columns and frame-parallel options, and set the I-frames to be 24 frames apart.

    I then create a stream.hdr file. The starting index is 1. This command continues to run infinitely until I kill it, grabbing new video from my webcam and outputting it into chunks.

    I then sleep for 2 seconds to give the previous command time to generate a header file.

    And that’s really it. The next invocation of FFMPEG simply creates the MPEG-DASH manifest file given the header generated in the previous step.

    So what’s going on ? Why can I not view the video in a web browser (I’m using Dash.js) ? I serve the manifest, header, and chunks on a Node.js server so that trivial issue is not the problem.

    Edit : Here is my full console output.

    ffmpeg version 3.0.7-0ubuntu0.16.10.1 Copyright (c) 2000-2017 the FFmpeg developers
    
  built with gcc 6.2.0 (Ubuntu 6.2.0-5ubuntu12) 20161005
    
  configuration: --prefix=/usr --extra-version=0ubuntu0.16.10.1 --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-librubberband --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-chromaprint --enable-libx264
    
  libavutil      55. 17.103 / 55. 17.103
    
  libavcodec     57. 24.102 / 57. 24.102
    
  libavformat    57. 25.100 / 57. 25.100
    
  libavdevice    57.  0.101 / 57.  0.101
    
  libavfilter     6. 31.100 /  6. 31.100
    
  libavresample   3.  0.  0 /  3.  0.  0
    
  libswscale      4.  0.100 /  4.  0.100
    
  libswresample   2.  0.101 /  2.  0.101
    
  libpostproc    54.  0.100 / 54.  0.100
    
[video4linux2,v4l2 @ 0x55847e244ea0] The driver changed the time per frame from 1/24 to 1/30
    
[mjpeg @ 0x55847e245c00] Changing bps to 8
    
Input #0, video4linux2,v4l2, from '/dev/video0':
    
  Duration: N/A, start: 64305.102081, bitrate: N/A
    
    Stream #0:0: Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown), 640x480, -5 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
    
Codec AVOption frame-parallel (Enable frame parallel decodability features) specified for output file #0 (stream_%d.chk) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
    
Codec AVOption tile-columns (Number of tile columns to use, log2) specified for output file #0 (stream_%d.chk) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
    
[swscaler @ 0x55847e24b720] deprecated pixel format used, make sure you did set range correctly
    
[libvpx @ 0x55847e248a20] v1.5.0
    
Output #0, webm_chunk, to 'stream_%d.chk':
    
  Metadata:
    
    encoder         : Lavf57.25.100
    
    Stream #0:0: Video: vp8 (libvpx), yuv420p, 640x480, q=-1--1, 50 kb/s, 30 fps, 30 tbn, 30 tbc
    
    Metadata:
    
      encoder         : Lavc57.24.102 libvpx
    
    Side data:
    
      unknown side data type 10 (24 bytes)
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mjpeg (native) -> vp8 (libvpx))
    
Press [q] to stop, [?] for help
    
frame=   21 fps=0.0 q=0.0 size=N/A time=00:00:00.70 bitrate=N/A dup=5 drop=frame=   36 fps= 35 q=0.0 size=N/A time=00:00:01.20 bitrate=N/A dup=5 drop=frame=   51 fps= 33 q=0.0 size=N/A time=00:00:01.70 bitrate=N/A dup=5 drop=ffmpeg version 3.0.7-0ubuntu0.16.10.1 Copyright (c) 2000-2017 the FFmpeg developers
    
  built with gcc 6.2.0 (Ubuntu 6.2.0-5ubuntu12) 20161005
    
  configuration: --prefix=/usr --extra-version=0ubuntu0.16.10.1 --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-librubberband --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-chromaprint --enable-libx264
    
  libavutil      55. 17.103 / 55. 17.103
    
  libavcodec     57. 24.102 / 57. 24.102
    
  libavformat    57. 25.100 / 57. 25.100
    
  libavdevice    57.  0.101 / 57.  0.101
    
  libavfilter     6. 31.100 /  6. 31.100
    
  libavresample   3.  0.  0 /  3.  0.  0
    
  libswscale      4.  0.100 /  4.  0.100
    
  libswresample   2.  0.101 /  2.  0.101
    
  libpostproc    54.  0.100 / 54.  0.100
    
Input #0, webm_dash_manifest, from 'stream.hdr':
    
  Metadata:
    
    encoder         : Lavf57.25.100
    
  Duration: N/A, bitrate: N/A
    
    Stream #0:0: Video: vp8, yuv420p, 640x480, SAR 1:1 DAR 4:3, 30 fps, 30 tbr, 1k tbn, 1k tbc (default)
    
    Metadata:
    
      webm_dash_manifest_file_name: stream.hdr
    
      webm_dash_manifest_track_number: 1
    
Output #0, webm_dash_manifest, to 'stream_manifest.mpd':
    
  Metadata:
    
    encoder         : Lavf57.25.100
    
    Stream #0:0: Video: vp8, yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=2-31, 30 fps, 30 tbr, 1k tbn, 1k tbc (default)
    
    Metadata:
    
      webm_dash_manifest_file_name: stream.hdr
    
      webm_dash_manifest_track_number: 1
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (copy)
    
Could not write header for output file #0 (incorrect codec parameters ?): Invalid data found when processing input
    
frame=   67 fps= 33 q=0.0 size
    
frame=   82 fps= 32 q=0.0 size=N/A time=00:00:02.73 bitrate=N/A dup=5 drop=
    
frame=   97 fps= 32 q=0.0 size=N/A time=00:00:03.23 bitrate=N/A dup=5 drop=
    
frame=  112 fps= 32 q=0.0 size=N/A time=00:00:03.73 bitrate=N/A dup=5 ...

  • Incorrect syntax using FFmpeg

    25 avril 2017, par Halid Kyazim

    Hello guys i am tring to convert videos using FFmpeg...

    1. I moved ffmpeg.exe in same folder with upload.php

    2. I tryed this codes in upload.php :

      $randname = (rand(0,1000));
      
$file_data=date("d-m-Y-H-i-s");
      
$file_name=$file_data.$randname;
      
move_uploaded_file($file_tmp,"vidconvert/".$file_name);
      
exec (ffmpeg -i vidconvert/.$file_name videos/.$file_name.mp4);
      
echo "Success";

    3. I want to get the file in vidconvert folder, and copy converted video to videos folder

    Note : when i check the vidconfert folder, the file is uploaded succesfully

  • ffmpeg - How to increase performance ?

    7 mai 2017, par Thanh Dao

    I’m trying to speed up and add background to mp4 videos. It taken a lots of time.

    ffmpeg -i input.mp4 -filter_complex "[0:v]setpts=0.91*PTS[i]; [0:a]atempo=1.1000[p]" -map "[i]" -map "[p]" output-1.mp4 2>&1

    Above command take about 30 minutes to do. The size of input file about 30-40MB, is not too large.
    And next, I run below command to add background to video, take about 30 mins (Background’s resolution is 1280x720)

    ffmpeg -i output-1.mp4 -i background.png -filter_complex "overlay=0:0" output.mp4 2>&1

    It make my system very slow, and performance is very bad.
    What can I do to improve ?

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