Hi!
Mark Heath wrote:
On 02/10/2005, at 6:35 PM, Frank Albrecht wrote:
Is it possible to use mencoder or ffmpeg for capturing for
mjpegtools? I couldn't figure out how to create an input
satifying lav2yuv/mpeg2.
Hopefully this is will answer what you are asking.
Mplayer and ffmpeg can both produce a yuv4mpeg stream which works
nicely with mjpeg tools.
the command lines would be like this:
ffmpeg -i input_file.ext -f yuv4mpegpipe outfile.yuv
you can replace outfile.yuv with - if you want to use standard out.
mplayer will only write to a file called stream.yuv, so if you want
to pipe it, you have to use mkfifo. It messes up the interlacing
field, it says that every file is progressive and the aspect field
saying that the file is 0:0
mplayer -vo yuv4mpeg input_file.ext
It's been my experience with mplayer 1.0pre7-3.3.5 and later (cvs) that
interlacing isn't messed up. However, you must specify that the piped
output should be interlaced. When piping to mpeg2enc, it detects when
the input file is interlaced and encodes appropriately. My command line
looks like:
mplayer -nosound -noframedrop -benchmark -vo yuv4mpeg:interlaced infile
If your source video is bottom-first, then change "interlaced" to
"interlaced_bf".
Joe
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