[Mplayer-cvslog] CVS: main/DOCS/tech formats.txt,1.1,1.2

Arpi of Ize arpi at mplayer.dev.hu
Thu Nov 8 00:15:24 CET 2001


Update of /cvsroot/mplayer/main/DOCS/tech
In directory mplayer:/var/tmp.root/cvs-serv3494

Modified Files:
	formats.txt 
Log Message:
typos fixed

Index: formats.txt
===================================================================
RCS file: /cvsroot/mplayer/main/DOCS/tech/formats.txt,v
retrieving revision 1.1
retrieving revision 1.2
diff -u -r1.1 -r1.2
--- formats.txt	7 Nov 2001 23:01:49 -0000	1.1
+++ formats.txt	7 Nov 2001 23:15:19 -0000	1.2
@@ -13,20 +13,20 @@
     CDRwin's .BIN files) without extracting mpeg files first (with tools like vcdgear)
     It accepts all PES variants, including files created by VDR.
     Note: VOB (video object) is simple mpeg stream, but it usually has 01BD
-    streams which may contain subtitles and non-mpeg audio. Usually found on DVD discs.
+    packets which may contain subtitles and non-mpeg audio. Usually found on DVD discs.
     
-    Headers: mpeg streams has no global header. each frame sequecne (also called GOP,
+    Headers: mpeg streams has no global header. each frame sequence (also called GOP,
     group of pictures) contains an sequence header, it describes that block.
-    In normal mpeg 1/2 content there are GOPs of 12-15 frames (24/30 fps).
+    In normal mpeg 1/2 content there are groups of 12-15 frames (24/30 fps).
     It means you can freely seek in mpeg streams, and even can cut it to
     small parts with standard file tools (dd, cut) without destroying it.
     
     Codecs: video is always mpeg video (mpeg1, mpeg2 or mpeg4).
     audio is usually mpeg audio (any layer allowed, but it's layer 2 in most files)
-    but 01BD streams may contain AC3 or LPCM too.
+    but 01BD packets may contain AC3, DTS or LPCM too.
     
-    FPS: mpeg2 content allow variable framerate, in form of delayed frames.
-    It's mostly used for playback 24fps contant at 29.97/30 fps (NTSC) rate.
+    FPS: mpeg2 content allows variable framerate, in form of delayed frames.
+    It's mostly used for playback 24fps content at 29.97/30 fps (NTSC) rate.
     (so called Telecine or 3:2 pulldown effect)
     It means you see 30 frames per second, but there are only 24 different
     pictures and some of them are shown longer to fill 30 frame time.
@@ -35,7 +35,7 @@
 
   - AVI streams.
     Two kind of RIFF AVI files exists:
-    1. interleaved: audio and video contant is interlaved. it's faster and
+    1. interleaved: audio and video content is interlaved. it's faster and
        requires only 1 reading thread, so it's recommended (and mostly used).
     2. non-interleaved: audio and video aren't interleaved, i mean first come
        whole video followed by whole audio. it requires 2 reading process or
@@ -44,6 +44,7 @@
        enables -ni option if it finds non-interleaved content. but sometimes
        the stream seems to be interleaved, but with bad sync so it should be
        played as non-interleaved otherwise you get a-v desync or buffer overflow.
+
     MPlayer supports 2 kind of timing for AVI files:
     - bps-based: it is baed on bitrate/samplerate of video/audio steram.
       this method is used by most players, including avifile and wmp.
@@ -72,7 +73,7 @@
     I also note, that most AVI encoders/multiplexers create bad files if
     using VBR audio. only 2 exception (known by me): NaNDub and MEncoder.
     
-    FPS: must be constant, but skipping frames are allowed.
+    FPS: only constant framerate allowed, but it's possib;e to skip frames.
 
   - ASF streams:
     ASF (active streaming format) comes from Microsoft. they developed two
@@ -87,7 +88,7 @@
     Asf uses fixed packet size, so it is seekable without any INDEX block,
     and broken files are playable well.
     
-    Codecs: video is mostly microsoft's mpeg4 variants, MP42, MP43 (aka DivX),
+    Codecs: video is mostly microsoft's mpeg4 variants: MP42, MP43 (aka DivX),
             WMV1 and WMV2. but any codecs allowed.
             audio is usually wma or voxware, but any codecs allowed.
 




More information about the MPlayer-cvslog mailing list