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authorFabrice Bellard2001-07-19 20:46:37 +0000
committerFabrice Bellard2001-07-19 20:46:37 +0000
commit1b58d58ddaf8a8c766a0353885ff504babed0453 (patch)
tree4b825dc642cb6eb9a060e54bf8d69288fbee4904 /doc/ffmpeg.txt
parent3089828607baa0511f0873f54372aedd62608e53 (diff)
removing old files
Originally committed as revision 4 to svn://svn.ffmpeg.org/ffmpeg/trunk
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-* ffmpeg can use YUV files as input :
-
- ffmpeg /tmp/out.mpg /tmp/test
-
-If will use the files:
-/tmp/test0.Y, /tmp/test0.U, /tmp/test0.V,
-/tmp/test1.Y, /tmp/test1.U, /tmp/test1.V, etc...
-
-The Y files use twice the resolution of the U and V files. They are
-raw files, without header. They can be generated by all decent video
-decoders.
-
-* ffmpeg can use a video4linux compatible video source :
-
- ffmpeg /tmp/out.mpg
-
- Note that you must activate the right video source and channel
- before launching ffmpeg. You can use any TV viewer such as xawtv by
- Gerd Knorr which I find very good.
-
-* There are some importants options to know:
-
--s size set frame size [160x128]
--f format set encoding format [mpeg1]
--r fps set frame rate [25]
--b bitrate set the bitrate in kbit/s [100]
--t time set recording time in seconds [10.0]
-
-The frame size can also be: cif, qcif, sqcif and 4cif.
-The encoding format can be mpeg1, h263 or rv10.
-
-Advanced options are:
-
--d device set video4linux device name
--g gop_size set the group of picture size.
- An 'intra' frame is generated every gop_size frames.
--i use only intra images (speed up compression, but lower quality).
--c comment set the comment string.
-
-Comment strings are only used for Real Video(tm) encoding. Tags are
-used in the comment string. A typical comment string is:
-
-"+title=Test Video +author=FFMpeg +copyright=Free +comment=Generated by FFMpeg 1.0"
-
-The output file can be "-" to output to a pipe. This is only possible
-with mpeg1 and h263 formats.
-
-* Tips:
-
-- For low bit rate application, use a low frame rate and a small gop
- size. This is especially true for real video where the Linux player
- does not seem to be very fast, so it can miss frames. An example is:
-
- ffmpeg -g 3 -r 3 -t 10 -b 50 -s qcif -f rv10 /tmp/b.rm
-
-- The parameter 'q' which is displayed while encoding is the current
- quantizer. The value of 1 indicates that a very good quality could
- be achieved. The value of 31 indicates the worst quality. If q=31
- too often, it means that the encoder cannot compress enough to meet
- your bit rate. You must either increase the bit rate, decrease the
- frame rate or decrease the frame size.
-