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• Piwik 3 Release Candidate

  14 décembre 2016, par Piwik Core Team — Development

  The release candidate for Piwik 3 is now available.

  RC means we think we’re done, but it’s possible we’ve missed something. We hope to ship Piwik 3 on Sunday, December 18th (updated). If you haven’t tested Piwik 3 yet, now is the time ! To test Piwik 3, you can use the beta release channel or you can download the release candidate here (zip).

  Piwik 3 is a jam-packed release, with a number of features focused on security, performance, and more advanced analytics capabilities. Highlights include new UI design, responsive experience on mobile, better email reports, secure password storage, better tracking of downloads and outlinks, and more.

  Not sure where to start with testing ? Try setting up a new installation and taking notes on what you enjoyed and what got you stuck. For more details about what’s new in version 3.0, check out the beta 1, beta 2, beta 3, beta 4 changelogs as well as these blog posts : Piwik 3 overview, and Important notes and API breaking changes in Piwik 3.

  Think you’ve found a bug ? Please post to our Issues tracker. If any known issues come up, you’ll be able to search and find them there.

  Developers, please test your plugins and themes against Piwik 3 and update your plugin.json to require Piwik 3. An in-depth field guide to developer-focused changes and plugin migration is published on the Developer website.

  Do you speak a language other than English ? Help us translate Piwik into more than 50 languages !

  Happy testing !

• Concatenating/Splicing overlapping video clips with ffmpeg

  16 décembre 2020, par Jimbo1987

  I'm trying to concatenate multiple short .mp4 video clips from a security camera. The camera records short clips, with a few seconds on either end of a timespan when motion is detected. For example, two minutes of video will often be broken up into four 35 second clips, with the first/last few seconds of each clip being duplicative of the last/first few seconds of the previous/next clip.

  


  I simply concatenate the clips together using the ffmpeg concat demuxer, as described here : How to concatenate two MP4 files using FFmpeg ?, with

  


  (echo file 'first file.mp4' & echo file 'second file.mp4' )>list.txt
ffmpeg -safe 0 -f concat -i list.txt -c copy output.mp4


  


  Or else I transcode them into intermediate MPEG-2 transport streams, which I can then concatenate with the file-level concat protocol, as described here : https://trac.ffmpeg.org/wiki/Concatenate#protocol, with

  


  ffmpeg -i "first file.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate1.ts
ffmpeg -i "second file.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate2.ts
ffmpeg -i "concat:intermediate1.ts|intermediate2.ts" -c copy -bsf:a aac_adtstoasc output.mp4


  


  But either way, the resulting video (output.mp4) jumps backward in time a few seconds every half-minute or so because of the duplicated frames.

  


  I want to throw out the duplicate frames, and tie the clips together based on timestamps to achieve smooth playback of the concatenated full-length video. I'd strongly prefer to do this on Windows with ffmpeg if possible. Surely this has been done before, right ? Are there timestamps in the .mp4 files that I can use to determine how much overlap there is, and then splice at the proper point-in-time ? And if so, how do I read them, how do I splice at an exact point in time, and how do I get around the KeyFrames issue if I can splice at the exact point in time ?

  


• Linux Mint LMDE ffmpeg h264

  18 juin 2015, par Lectem

  I’m trying to decode H264 using libavcodec on Linux Mint LMDE.
  I installed ffmpeg, libavcodec-dev and libx264-dev but the H264 codec is still not recognized by the library in my own program.

  However, ffplay works fine on a h264 stream.

  Here is what I do :

  avcodec_find_decoder(AV_CODEC_ID_H264);

  and it returns NULL.

  Why doesn’t it find the codec ? What should I do to make it work ?

  I’d rather not recompile libavcodec because it would mean I would have to link it statically later on in my program.

  Here is the version information of ffmpeg :

  ffmpeg -version ffmpeg version 2.1.1 built on Nov 20 2013 08:04:32
  with gcc 4.8 (Debian 4.8.2-5) configuration : —prefix=/usr
  —extra-cflags=’-g -O2 -fstack-protector —param=ssp-buffer-size=4 -Wformat -Werror=format-security ’ —extra-ldflags=’-Wl,-z,relro’ —cc=’ccache cc’ —enable-shared —enable-libmp3lame —enable-gpl —enable-nonfree —enable-libvorbis —enable-pthreads —enable-libfaac —enable-libxvid —enable-postproc —enable-x11grab —enable-libgsm —enable-libtheora —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libx264 —enable-libspeex —enable-nonfree —disable-stripping —enable-libvpx —enable-libschroedinger —disable-encoder=libschroedinger —enable-version3 —enable-libopenjpeg —enable-librtmp —enable-avfilter —enable-libfreetype —enable-libvo-aacenc —disable-decoder=amrnb —enable-libvo-amrwbenc —enable-libaacplus —libdir=/usr/lib/x86_64-linux-gnu —disable-vda —enable-libbluray —enable-libcdio —enable-gnutls —enable-frei0r —enable-openssl —enable-libass —enable-libopus —enable-fontconfig —enable-libpulse —disable-mips32r2 —disable-mipsdspr1 —disable-mipsdspr2 —enable-libvidstab —enable-libzvbi —enable-libiec61883 —enable-libfdk-aac —enable-vaapi —enable-libdc1394 —disable-altivec —disable-armv5te —disable-armv6 —disable-vis —shlibdir=/usr/lib/x86_64-linux-gnu libavutil 52. 48.101 / 52. 48.101 libavcodec 55. 39.101 / 55. 39.101 libavformat 55. 19.104 / 55. 19.104 libavdevice 55. 5.100 / 55. 5.100 libavfilter 3. 90.100 / 3. 90.100 libswscale 2. 5.101 / 2. 5.101 libswresample 0. 17.104 / 0. 17.104 libpostproc 52. 3.100 / 52.
  3.100