Un pic despre formate video (.mkv) …

Rusii nu-s prosti oameni buni. Vorbim aici de extensia .mvk (Matroska Multimedia Container) care este optimizata ca spatiu de alocare mult mai bine decit, de exemplu, clasicul .mp4. Posibila explicatie este undeva in refolosirea imaginilor statice … daca ai un set de ‘frames’ succesive in care imaginile nu sint foarte diferite, poti re-utiliza ce a fost si doar stoca micile diferente!

Urmeaza exemplul si cobaiul pentru analiza de laborator. Aproapte 8 ore in, undeva peste 1 GB, nu este rau deloc. Continul este in mare parte sunet plus imagini, din cred PowerPoint, ideal pentru compresie:

----------------------------------------------------------------
             Music Theory Course from educator.com
Summary: 20 videos/1.18 GB (1,276,626,075 bytes)/07:48:22
----------------------------------------------------------------
                                              Duration File Size
----------------------------------------------------------------
01 - Note Reading                               12:37   30.3 MB
02 - Scales                                     23:25   64.6 MB
03 - Key Signatures                             18:41   53.3 MB
04 - Intervals                                  33:19   92.7 MB
05 - Triads                                     26:12   61.9 MB
06 - Seventh Chords                             19:42   50.0 MB
07 - Inversions of Triads                       17:27   42.6 MB
08 - Inversion of Seventh Chords                19:11   49.3 MB
09 - Part Writing Root Position Triads          24:41   63.0 MB
10 - Voice Leading                              18:24   45.3 MB
11 - Cadences                                   15:04   37.4 MB
12 - Part Writing First Inversion Triads        25:10   73.5 MB
13 - Part Writing Second Inversion Triads       17:14   47.3 MB
14 - Non Harmonic Tones                         24:16   61.2 MB
15 - Part Writing Seventh Chords                25:28   63.6 MB
16 - Secondary Dominants & Leading Tone Chords  27:09   74.2 MB
17 - Modulation to Closely Related Keys         28:03   75.7 MB
18 - Phrases and Periods                        38:39   94.4 MB
19 - Binary & Ternary Forms                     39:15   98.3 MB
20 - Modes                                      14:25   38.2 MB
----------------------------------------------------------------
Total Files Size                                        1.18 GB
----------------------------------------------------------------
Total Duration                                         07:48:22 
----------------------------------------------------------------

Fiind ‘open source’, Windows (aici v8.1) nu stie prea multe. In Explorer,
incercind ‘File Properties’, nu obtii decit informatii de marime a fisierelor,
in contrast cu alte formate clasice (.avi, .mp4) pentru care obtii durata,
‘bitrate’ si alte chestii folositoare!

A trebuit sa folesesc VLC pentru informatii aditionale!

mp4 vs mkv.jpg

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