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JPEG image compression FAQ, part 1/2
Section - [20] Isn't there an M-JPEG standard for motion pictures?

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As was stated in section 1, JPEG is only for still images.  Nonetheless,
you will frequently see references to "motion JPEG" or "M-JPEG" for video.
*There is no such standard*.  Various vendors have applied JPEG to
individual frames of a video sequence, and have called the result "M-JPEG".
Unfortunately, in the absence of any recognized standard, they've each done
it differently.  The resulting files are usually not compatible across
different vendors.

MPEG is the recognized standard for motion picture compression.  It uses
many of the same techniques as JPEG, but adds inter-frame compression to
exploit the similarities that usually exist between successive frames.
Because of this, MPEG typically compresses a video sequence by about a
factor of three more than "M-JPEG" methods can for similar quality.
The disadvantages of MPEG are (1) it requires far more computation to
generate the compressed sequence (since detecting visual similarities is
hard for a computer), and (2) it's difficult to edit an MPEG sequence on a
frame-by-frame basis (since each frame is intimately tied to the ones around
it).  This latter problem has made "M-JPEG" methods rather popular for video
editing products.

It's a shame that there isn't a recognized M-JPEG standard.  But there
isn't, so if you buy a product identified as "M-JPEG", be aware that you
are probably locking yourself into that one vendor.

Recently, both Microsoft and Apple have started pushing (different :-()
"standard" M-JPEG formats.  It remains to be seen whether either of these
efforts will have much impact on the current chaos.  Both companies were
spectacularly unsuccessful in getting anyone else to adopt their ideas about
still-image JPEG file formats, so I wouldn't assume that anything good will
happen this time either...

See the MPEG FAQ for more information about MPEG.

User Contributions:

Report this comment as inappropriate
Nov 11, 2018 @ 11:11 am
Artikel ini menjawab Pertanyaan yang Sering Diajukan tentang kompresi gambar JPEG.
Ini adalah bagian 1, yang meliputi pertanyaan umum dan jawaban tentang JPEG. Bagian 2
memberikan petunjuk khusus sistem dan rekomendasi program. Seperti biasa,
saran untuk peningkatan FAQ ini disambut baik.

Baru sejak versi 14 Maret 1999:
* Memperluas item 10 untuk mendiskusikan rotasi tanpa loss dan pemangkasan JPEG.


Artikel ini mencakup bagian-bagian berikut:

Pertanyaan dasar:

[1] Apa itu JPEG?
[2] Mengapa menggunakan JPEG?
[3] Kapan saya harus menggunakan JPEG, dan kapan saya harus tetap menggunakan GIF?
[4] Seberapa baik gambar kompresi JPEG?
[5] Pengaturan "kualitas" apa yang bagus untuk JPEG?
[6] Di mana saya bisa mendapatkan perangkat lunak JPEG?
[7] Bagaimana cara melihat gambar JPEG yang diposkan di Usenet?

Pertanyaan lanjutan lainnya:

[8] Apa itu kuantisasi warna?
[9] Apa beberapa aturan praktis untuk mengkonversi gambar GIF ke JPEG?
[10] Apakah kehilangan terakumulasi dengan kompresi / dekompresi berulang?
[11] Apa itu JPEG progresif?
[12] Dapatkah saya membuat JPEG transparan?
[13] Apakah tidak ada JPEG lossless?
[14] Mengapa semua argumen tentang format file?
[15] Bagaimana saya mengenali format file yang saya miliki, dan apa yang harus saya lakukan?
[16] Masalah kompatibilitas umum apa saja yang ada di sana?
[17] Bagaimana cara kerja JPEG?
[18] Bagaimana dengan pengkodean aritmatika?
[19] Mungkinkah FPU mempercepat JPEG? Bagaimana dengan chip DSP?
[20] Apakah tidak ada standar M-JPEG untuk film?
[21] Bagaimana jika saya membutuhkan lebih dari 8-bit presisi?
[22] Bagaimana program saya mengekstrak dimensi gambar dari file JPEG?

Miscellaneous:

[23] Di mana saya bisa belajar tentang menggunakan gambar di World Wide Web?
[24] Di mana daftar FAQ diarsipkan?


Artikel ini dan rekannya diposting setiap 2 minggu. Jika Anda tidak dapat menemukannya
Bagian 2, Anda bisa mendapatkannya dari arsip di rtfm.mit.edu
(lihat "[24] Di mana daftar FAQ diarsipkan?"). Bagian 2 sangat sering berubah;
dapatkan salinan baru jika yang Anda baca berusia lebih dari beberapa bulan.

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Top Document: JPEG image compression FAQ, part 1/2
Previous Document: [19] Could an FPU speed up JPEG? How about a DSP chip?
Next Document: [21] What if I need more than 8-bit precision?

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Last Update March 27 2014 @ 02:11 PM