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• Trim video length in Android with javacv and ffmpeg

  11 juillet 2017, par Morya Yaroslav

  I’m trying to trim video length with ffmpeg implementation of FrameGrabber and FrameRecorder, but getting corrupted file of smaller size then it’s going to be. Maybe there is other way to trim video from start time to end time, also updating trim progress. Seems like it’s not recording changes between frames. Maybe there are some other ways to trim videos of different formats like mp4, flv and others. Here is code snippet :

          FrameGrabber grabber = new FFmpegFrameGrabber(mClip.getPath());
  
          grabber.start();
  
          grabber.setTimestamp(mClip.getClipStartMs()); // Write from specific moment
  
  
  
          File out = new File(mClip.getOutPutPath(params[0])); // Set destination to write
  
          FrameRecorder recorder = new FFmpegFrameRecorder(out, grabber.getImageWidth(), grabber.getImageHeight());
  
  
  
  
  
          recorder.setFormat(grabber.getFormat());
  
          recorder.setFrameRate(grabber.getFrameRate());
  
          recorder.setSampleRate(grabber.getSampleRate());
  
          recorder.setAspectRatio(grabber.getAspectRatio());
  
          recorder.setSampleFormat(grabber.getSampleFormat());
  
  
  
          recorder.setAudioCodec(grabber.getAudioCodec());
  
          recorder.setAudioBitrate(grabber.getAudioBitrate());
  
          recorder.setAudioChannels(grabber.getAudioChannels());
  
  
  
          recorder.setVideoCodec(grabber.getVideoCodec());
  
          recorder.setVideoBitrate(grabber.getVideoBitrate());
  
  
  
          recorder.start();
  
  
  
          Frame frame;
  
          Long timestamp;
  
          Long fullLength = mClip.getClipEndMs() - mClip.getClipStartMs();
  
          double percent = 0d, oldPercent = 0d;
  
  
  
          while ((frame = grabber.grabFrame()) != null && (timestamp = grabber.getTimestamp()) <= mClip.getClipEndMs()) {
  
              Log.d(ASYNC_SAVE_TAG, "Started command : ffmpeg " + mClip.toString());
  
  
  
              if (timestamp != 0d) {
  
                  oldPercent = percent;
  
                  percent = timestamp.doubleValue() / fullLength.doubleValue();
  
                  if (MathUtil.compare(percent, oldPercent) != 0) {
  
                      publishProgress(percent);
  
                  }
  
              }
  
  
  
              recorder.setTimestamp(grabber.getTimestamp() - mClip.getClipStartMs());
  
              recorder.record(frame);
  
          }
  
  
  
          grabber.close();
  
          recorder.close();

• Knitr Plot Animation - disappearing output files ?

  20 avril 2015, par tcs

  I downloaded the latest ffmpeg (exe version), unzipped the files, renamed the directory to ffmpeg, copied the directory into c :\Program Files. I appended my PATH variable to include c :\Program Files\ffmpeg\bin. Finally, I restarted Rstudio.

  While attempting to run the following code chunk :

  ```{r perf_plot, fig.width=7, fig.height=6, fig.show='animate'}
  
  library(corrplot)
  
  corrplot(m, method = "circle")
  
  m<-sequence_2_matrix(perf_list[[1]])
  
  corrplot(m)
  
  for (i in 2:length(perf_list)) {
  
    m<-(m*(i-1)+sequence_2_matrix(perf_list[[i]]))/i
  
    corrplot(m,method = "circle")
  
  
  
  }

  I see within the output in in my RMarkdown window that the ffmpeg call seems to be successfully run, but while watching the directory where my code is located the png that is attempted to be created can often disappear, or not appear at all. Strangeness.

  processing file: MarkovRoutinesSim.rmd
  
    |........                                                         |  13%
  
    ordinary text without R code
  
  
  
    |...........                                                      |  17%
  
  label: unnamed-chunk-2
  
    |..............                                                   |  22%
  
    ordinary text without R code
  
  
  
    |.................                                                |  26%
  
  label: unnamed-chunk-3
  
    |....................                                             |  30%
  
    ordinary text without R code
  
  
  
    |.......................                                          |  35%
  
  label: unnamed-chunk-4
  
    |.........................                                        |  39%
  
    ordinary text without R code
  
  
  
    |............................                                     |  43%
  
  label: unnamed-chunk-5
  
    |...............................                                  |  48%
  
    ordinary text without R code
  
  
  
    |..................................                               |  52%
  
  label: unnamed-chunk-6
  
    |.....................................                            |  57%
  
    ordinary text without R code
  
  
  
    |........................................                         |  61%
  
  label: unnamed-chunk-7
  
    |..........................................                       |  65%
  
    ordinary text without R code
  
  
  
    |.............................................                    |  70%
  
  label: perf_plot (with options) 
  
  List of 3
  
   $ fig.width : num 7
  
   $ fig.height: num 6
  
   $ fig.show  : chr "animate"
  
  
  
  executing: ffmpeg -y -r 1 -i MarkovRoutinesSim_files/figure-html/perf_plot-%d.png MarkovRoutinesSim_files/figure-html/perf_plot-.webm
  
  ffmpeg version N-71515-ga40cee0 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.9.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      54. 22.101 / 54. 22.101
  
    libavcodec     56. 34.100 / 56. 34.100
  
    libavformat    56. 30.100 / 56. 30.100
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 14.100 /  5. 14.100
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, image2, from 'MarkovRoutinesSim_files/figure-html/perf_plot-%d.png':
  
    Duration: 00:00:00.44, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: png, pal8, 1344x1152 [SAR 7559:7559 DAR 7:6], 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  [libvpx @ 000000000310e720] v1.4.0
  
  Output #0, webm, to 'MarkovRoutinesSim_files/figure-html/perf_plot-.webm':
  
    Metadata:
  
      encoder         : Lavf56.30.100
  
      Stream #0:0: Video: vp8 (libvpx), yuv420p, 1344x1152 [SAR 1:1 DAR 7:6], q=-1--1, 200 kb/s, 1 fps, 1k tbn, 1 tbc
  
      Metadata:
  
        encoder         : Lavc56.34.100 libvpx
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (png (native) -> vp8 (libvpx))
  
  Press [q] to stop, [?] for help
  
    |................................................                 |  74%
  
    ordinary text without R code
  
  
  
    |...................................................              |  78%
  
  label: unnamed-chunk-8
  
    |......................................................           |  83%
  
    ordinary text without R code
  
  
  
    |.........................................................        |  87%
  
  label: unnamed-chunk-9
  
  frame=   11 fps=0.0 q=0.0 Lsize=     108kB time=00:00:11.00 bitrate=  80.8kbits/s    
  
  video:108kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.524176%
  
    |...........................................................      |  91%
  
    ordinary text without R code
  
  
  
    |..............................................................   |  96%
  
  label: unnamed-chunk-10
  
    |.................................................................| 100%
  
    ordinary text without R code
  
  
  
  
  
  "C:/Program Files/RStudio/bin/pandoc/pandoc" MarkovRoutinesSim.utf8.md --to html --from markdown+autolink_bare_uris+ascii_identifiers+tex_math_single_backslash-implicit_figures --output MarkovRoutinesSim.html --smart --email-obfuscation none --self-contained --standalone --section-divs --template "C:\Users\Tim\Documents\R\win-library\3.2\rmarkdown\rmd\h\default.html" --variable "theme:bootstrap" --include-in-header "C:\Users\Tim\AppData\Local\Temp\Rtmpkrtekd\rmarkdown-str7d43d7d5475.html" --mathjax --variable "mathjax-url:https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML" --no-highlight --variable "highlightjs=C:\Users\Tim\Documents\R\win-library\3.2\rmarkdown\rmd\h\highlight" 
  
  output file: MarkovRoutinesSim.knit.md
  
  
  
  
  
  Output created: MarkovRoutinesSim.html

  Any ideas on what might be happening ? I’ve tried adding in other graphs, and I see this random behavior of the file folder appearing disappearing, sometimes the file is created, other times not.

• Anomalie #3351 (Nouveau) : Le header ’link’ est affiché dans la page généré au lieu d’être envoyé ...

  21 novembre 2014, par marcimat ☺☮☯♫

  La modification http://zone.spip.org/trac/spip-zone/changeset/86161/_core_/plugins/compresseur introduit un problème dans certains cas.
  Effectivement, le < ?php n’est pas toujours exécuté, mais renvoyé comme du texte au navigateur qui ne sait pas trop quoi en faire.

  Le problème vient de la fonction analyse_resultat_skel() http://core.spip.org/projects/spip/repository/entry/spip/ecrire/public/composer.php#L173 :
  elle calcule le process_ins (html ou php) avant le passage des filtres. Cependant, comme celui-ci, l’un d’eux peut ajouter un < ?php dans le code
  et du coup le process_ins devient erroné.