Monday, July 23, 2007

FFmpeg

FFmpeg là 1 giải pháp khá tốt để ghi âm, chuyển đổi kiểu file, hay nghe stream audio-video. FFmpeg bao gồm cả libavcode, đang là 1 thư viện mã hàng đầu về audio/video. FFmpeg được phát triển trên Linux, nhưng nó có thể được biên dịch ở tất cả các hệ điều hành, kể cả Win. Trong Ubuntu, gói này chứa các thành phần sau: ffplay multimedia player, ffserver streaming server, ffmpeg audio và video encoder. Chúng hỗ trợ hầu hết các kiểu định dạng file (AVI, MPEG, OGG, Matroska, ASF, …) và các kiểu định dạng mã (MPEG, DivX, MPEG4, AC3, DV, …).
Những đặc tính của FFmpeg :
Đây là công cụ dòng lệnh để chuyển đổi định dạng video sang các kiểu khác. Nó cũng hỗ trợ cả việc ghi lại và mã hoá theo thời gian thực từ card TV.

  • ffserver là HTTP (RTSP đang được phát triển) multimedia streaming server cho truyền thông trực tiếp. Sự thay đổi thời gian của truyền thông trực tiếp cũng được hỗ trợ.
  • ffplay là một trình nghe nhạc đơn giản dựa trên SDL và trên những thư viện FFmpeg.
  • libavcodec là một thư viện chứa tất cả những phương pháp mã hoá và giải mã FFmpeg audio/video.Hầu hết các mã được pát triển từ đầu để chắc chắn chạy tốt nhất và việc tái sử dụng mã cao.
  • libavformat là một thư viện chứa những kiểu phân tích và khai sinh cho tất cả những định dạng audio/video phổ biến.
Cài ffmpeg Ubuntu :
sudo apt-get install ffmpeg

Chuyển .flv sang .mpg dùng ffmpeg

Trước tiên, bạn cần down file .flv vào thư mục. Mở Teminal lên và chuyển vào thư mục chứa file .flv hồi nãy, rồi gõ lệnh này:

ffmpeg -i tên_file_gốc.flv -ab 56 -ar 22050 -b 500 -s 320×240 tên_file_kết_quả.mpg

-b bitrate: thiết lập độ nén trên kbit/s (mặc định = 200 kb/s)

-ab bitrate: thiết lập độ nén audio trên kbit/s (mặc định = 64)

-ar sample rate: thiết lập tỉ lệ audio mẫu trên Hz (mặc đinh = 44100 Hz)

-s size: thiết lập kích thước khung. Định dạng là WxH(Rộngx Cao) (mặc định 160×128 )

Chúc bạn thành công !

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