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• Official Debian Package for Piwik now available

  15 avril 2014, par Matthieu Aubry — Community, Meta

  We are excited to announce the release of Piwik package for Debian based linux distributions !

  There are several ways to use Piwik :
  
   Download and upload to your server
  
   or use 1-click Piwik installers
  
   or use Microsoft web app gallery
  
   or buy Piwik Cloud
  
   or as of today, you may get Piwik using our Debian package

  What are the benefits of using Debian package over direct download ?

  For some system administrators, using Debian package is an easier alternative than directly downloading the code. It allows sysadmins to deploy Piwik within seconds using “apt-get install piwik -V”.

  How do I install Piwik using official debian package ?

  The package supports Apache and Nginx web servers. Read the documentation at debian.piwik.org.

  Do I have to use the Debian Package on my debian system ?

  No, you may still want to use Piwik using the direct download approach. You can keep Piwik upgraded quite easily using the popular 1-click automatic update.

  How do I report a bug or feedback ?

  Create a ticket on the Github project Issues page.

  Will the debian repository be maintained in the future ?

  Yes, Aurélien Requiem (github) along with the Piwik team are committed to maintain the Debian Piwik repository in the future.

  Thank you to Aurélien for his great work on preparing, testing, and maintaining the Debian repository for Piwik.

  References

  • Source code for the Debian package is on Github : piwik/package-debian
  • How do I enable automatic updates to latest development release ?
  • How do I install Piwik on Debian type servers ?

• Python script creates too short video using ffmpeg

  25 mai 2014, par Majzlik

  I use python script to create multiple pictures and call ffmpeg to create video. But there is a problem, because ffmpeg use just few pictures (about 7 - 10 from 160), but throws no error. I’ve tried the same command from commandline and video was correct. I’m calling ffmpeg this way :

  ffmpeg_call = ["ffmpeg", "-r", str(FPS), "-b", "16777216", "-y", "-i", "./sample_%05d.png", FILEOUTNAME + ".mp4"]
  
  subprocess.call(ffmpeg_call)

  and this was command in commandline :

  ffmpeg -r 25 -b 16777216 -y -i ./sample_%05d.png animation.mp4

  I’ve printed these commands to compare and they were the same, so there has to be problem in ffmpeg + python cooperation. Don’t you know, how to fix it ?

  UPDATE :

  this is log from ffmpeg :

  ffmpeg version 0.8.10-4:0.8.10-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav     developers
  
    built on Feb  6 2014 20:56:59 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.
  
  Input #0, image2, from '/tmp/tmpRKxT6s/ampgraph/tmp/sample_%05d.png':
  
  Duration: 00:00:00.44, start: 0.000000, bitrate: N/A
  
  Stream #0.0: Video: png, pal8, 640x480, 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  Incompatible pixel format 'pal8' for codec 'mpeg4', auto-selecting format 'yuv420p'
  
  [buffer @ 0x19e18a0] w:640 h:480 pixfmt:pal8
  
  [avsink @ 0x19ee1c0] auto-inserting filter 'auto-inserted scaler 0' between the filter 'src' and the filter 'out'
  
  [scale @ 0x19e2fc0] w:640 h:480 fmt:pal8 -> w:640 h:480 fmt:yuv420p flags:0x4
  
  Output #0, mp4, to './ampgraph/animation.mp4':
  
    Metadata:
  
      encoder         : Lavf53.21.1
  
      Stream #0.0: Video: mpeg4, yuv420p, 640x480, q=2-31, 200 kb/s, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
  Press ctrl-c to stop encoding
  
  frame=   11 fps=  0 q=2.5 Lsize=      46kB time=0.44 bitrate= 859.1kbits/s    
  
  video:45kB audio:0kB global headers:0kB muxing overhead 1.906569%

• ffmpeg determine correct codec to use

  8 avril 2020, par nha

  I am trying to use .y4m files that I feed into Chrome for playing.
This is the only format that I can use.

  



  I have a set of .y4m files that are working for my use case, taken from here.
For example let's say that I use the file mobile_qcif_7.5fps.y4m.

  



  I also have a .mp4 file (specifically the sample small.mp4 file from techslides ). I know how to convert small.mp4 to small.y4m with the following command :

  



  ffmpeg -y -i small.mp4 small.y4m

  



  I would like the resulting file to be accepted by Chrome, just like the other file.
What options should I use (and how to find them) ?

  



  Additional information

  



  ffprobe gives :

  



  $ ffprobe small.y4m 
avprobe version 0.8.13-6:0.8.13-0ubuntu0.13.10.1, Copyright (c) 2007-2014 the Libav developers
  built on Jul 15 2014 13:48:35 with gcc 4.8.1
[yuv4mpegpipe @ 0x23160c0] Estimating duration from bitrate, this may be inaccurate
Input #0, yuv4mpegpipe, from 'small.y4m':
  Duration: N/A, bitrate: N/A
    Stream #0.0: Video: rawvideo, yuv420p, 560x320, 30 fps, 30 tbr, 30 tbn, 30 tbc


$ ffprobe mobile_qcif_7.5fps.y4m
avprobe version 0.8.13-6:0.8.13-0ubuntu0.13.10.1, Copyright (c) 2007-2014 the Libav developers
  built on Jul 15 2014 13:48:35 with gcc 4.8.1
[yuv4mpegpipe @ 0x1e080c0] max_analyze_duration reached
[yuv4mpegpipe @ 0x1e080c0] Estimating duration from bitrate, this may be inaccurate
Input #0, yuv4mpegpipe, from 'mobile_qcif_7.5fps.y4m':
  Duration: N/A, bitrate: N/A
    Stream #0.0: Video: rawvideo, yuv420p, 176x144, PAR 128:117 DAR 1408:1053, 7.50 fps, 7.50 tbr, 7.50 tbn, 7.50 tbc


  



  OS : I am using ffmpeg in Ubuntu 13.10 from the default repository : I ran sudo apt-get install ffmpeg libavcodec-extra-53

  



  Complete console output

  



  $ ffmpeg -y -i small.mp4 small.y4m
ffmpeg version 0.8.13-6:0.8.13-0ubuntu0.13.10.1, Copyright (c) 2000-2014 the Libav developers
  built on Jul 15 2014 13:48:35 with gcc 4.8.1
*** THIS PROGRAM IS DEPRECATED ***
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'small.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42isomavc1
    creation_time   : 2010-03-20 21:29:11
    encoder         : HandBrake 0.9.4 2009112300
  Duration: 00:00:05.56, start: 0.000000, bitrate: 551 kb/s
    Stream #0.0(und): Video: h264 (Constrained Baseline), yuv420p, 560x320, 465 kb/s, 30 fps, 30 tbr, 90k tbn, 60 tbc
    Metadata:
      creation_time   : 2010-03-20 21:29:11
    Stream #0.1(eng): Audio: aac, 48000 Hz, mono, s16, 83 kb/s
    Metadata:
      creation_time   : 2010-03-20 21:29:11
[buffer @ 0x7274e0] w:560 h:320 pixfmt:yuv420p
Output #0, yuv4mpegpipe, to 'small.y4m':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42isomavc1
    creation_time   : 2010-03-20 21:29:11
    encoder         : Lavf53.21.1
    Stream #0.0(und): Video: rawvideo, yuv420p, 560x320, q=2-31, 200 kb/s, 90k tbn, 30 tbc
    Metadata:
      creation_time   : 2010-03-20 21:29:11
Stream mapping:
  Stream #0.0 -> #0.0
Press ctrl-c to stop encoding
frame=  166 fps=  0 q=0.0 Lsize=   43576kB time=5.53 bitrate=64513.5kbits/s    
video:0kB audio:0kB global headers:0kB muxing overhead inf%


  



  Head of the files

  



  Not sure if this is relevant, but the text content of both files begin like that :

  



  mobile_qcif_7.5fps.y4m
YUV4MPEG2 W176 H144 F15:2 Ip A128:117
FRAME

small.y4m (invalid)
YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420mpeg2 XYSCSS=420MPEG2
FRAME


  



  Additional experiment

  



  Taking the sample mobile_qcif_7.5fps.y4m, turning it into a .mp4 file and then back into a .y4m produces an invalid file (at least for Chrome).

  



  Answer to comments in the answer of @SirDarius

  



  Following the suggestion of @SirDarius ; I tried the following commands.
They failed to produce a valid file.

  



  # [COMMAND]   # [RESULT] [HEADER]
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -pix_fmt yuv444p -y small_yuv444p.y4m   # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C444 XYSCSS=444
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -pix_fmt yuv422p -y small_yuv422p.y4m   # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C422 XYSCSS=422
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -pix_fmt yuv420p -y small_yuv420p.y4m   # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420mpeg2 XYSCSS=420MPEG2
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -pix_fmt yuv411p -y small_yuv411p.y4m   # KO   YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C411 XYSCSS=411

ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -strict -1 -pix_fmt yuv420p9 -y small_yuv420p9.y4m   # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420p9 XYSCSS=420P9
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -strict -1 -pix_fmt yuv420p12 -y small_yuv420p12.y4m # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420p12 XYSCSS=420P12
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -strict -1 -pix_fmt yuv420p14 -y small_yuv420p14.y4m # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420p14 XYSCSS=420P14
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -strict -1 -pix_fmt yuv420p16 -y small_yuv420p16.y4m # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420p16 XYSCSS=420P16


  



  When trying other formats (like yuv420p12be, which was in the output of -pix_fmts), I had the following output (hence my previous trials) :

  



  $  ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -pix_fmt yuv420p12be -y small_yuv420p12be.y4m 
ffmpeg version N-68884-g3ebd76a Copyright (c) 2000-2015 the FFmpeg developers
  built on Jan  6 2015 11:03:21 with gcc 4.8 (Ubuntu/Linaro 4.8.1-10ubuntu9)
  configuration: 
  libavutil      54. 16.100 / 54. 16.100
  libavcodec     56. 19.100 / 56. 19.100
  libavformat    56. 18.100 / 56. 18.100
  libavdevice    56.  3.100 / 56.  3.100
  libavfilter     5.  6.100 /  5.  6.100
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x21d0220] overread end of atom 'colr' by 1 bytes
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'small.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42isomavc1
    creation_time   : 2010-03-20 21:29:11
    encoder         : HandBrake 0.9.4 2009112300
  Duration: 00:00:05.57, start: 0.000000, bitrate: 551 kb/s
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, bt709), 560x320, 465 kb/s, 30 fps, 30 tbr, 90k tbn, 60 tbc (default)
    Metadata:
      creation_time   : 2010-03-20 21:29:11
      encoder         : JVT/AVC Coding
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 83 kb/s (default)
    Metadata:
      creation_time   : 2010-03-20 21:29:11
[yuv4mpegpipe @ 0x21d8180] ERROR: yuv4mpeg can only handle yuv444p, yuv422p, yuv420p, yuv411p and gray8 pixel formats. And using 'strict -1' also yuv444p9, yuv422p9, yuv420p9, yuv444p10, yuv422p10, yuv420p10, yuv444p12, yuv422p12, yuv420p12, yuv444p14, yuv422p14, yuv420p14, yuv444p16, yuv422p16, yuv420p16 and gray16 pixel formats. Use -pix_fmt to select one.
Output #0, yuv4mpegpipe, to 'small_yuv420p12be.y4m':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42isomavc1
    encoder         : Lavf56.18.100
    Stream #0:0(und): Video: rawvideo ([12][11]3Y / 0x59330B0C), yuv420p12be, 560x320, q=2-31, 200 kb/s, 7.50 fps, 7.50 tbn, 7.50 tbc (default)
    Metadata:
      creation_time   : 2010-03-20 21:29:11
      encoder         : Lavc56.19.100 rawvideo
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> rawvideo (native))
Could not write header for output file #0 (incorrect codec parameters ?): Input/output error


  



  After that, I also tried to edit with an hexadecimal editor (bless) the small_yuv420p.y4m file. I replace C420mpeg2 by C420, and the file was accepted by Chrome.
What does the number in 420p[number] correspond to ? It is not explained there.
Is there any way to make ffmpeg output this kind of header files ?

  



  @SirDarius, thank you again for your help.

  



  The question

  



  (in case you forgot after this text blob)

  



  How can I convert the small.mp4 into a small.y4m file that has the same properties as the mobile_qcif_7.5fps.y4m file ?