Fwd: yuv4mpeg from ffmpeg?
Jay Thompson <[email protected]> Tue, 7 Aug 2007 14:57:29 -0700
| Newsgroups | gmane.comp.video.gephex.devel |
|---|---|
| Message-ID | <[email protected]> |
--===============0774920569== Content-Type: multipart/alternative; boundary=Apple-Mail-1--89264374 --Apple-Mail-1--89264374 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Hi everyone... I tried to post to the user list but it doesn't seem to be responding so I am forwarding my question to the development list. Please let me know if I shouldn't send my noob questions to this list. Thanks, jt Begin forwarded message: > From: Jay Thompson <[email protected]> > Date: August 7, 2007 2:22:07 PM PDT (CA) > To: [email protected] > Subject: yuv4mpeg from ffmpeg? > > Hi All... I posted originally to the devel list accidently but it's > probably better if I use the user list. I've been trying to find a > way to get a live signal from my DV camcorder into Gephex. I've > been making progress using ffmpeg but also had trouble getting it > to read the camera. So now I am using dvgrab piped to ffmpeg and > that seems to work well. If I write to a MP4 the process soaks up > about 15% of my cpu and writing to YUV takes up about 6% (combined > dvgrab and ffmpeg). Both are acceptable. > > What I'm trying to accomplish is a yuv4mpeg stream from ffmpeg that > Gephex can read. It seems ffmpeg will do this but I'm going in > circles and could use some advice. I've read many things on the > web, man pages, readme's, etc... but am missing something. Does the > Gephex yuv4mpeg module read from a fifo file or is the stream piped > from ffmpeg to Gephex? The Gephex y4m module won't even see any of > my mkfifo files. With other attempts Gephex just shows a green > screen - I probably need to convert the video from 4:1:1 to 4:2:2 > or 4:2:0 er something. This doesn't really matter at this point > because mostly I get unrecognized header errors. > > To be a little more concise - To get a yuv4mpeg stream into Gephex > from ffmpeg: > Do I use a pipe or a fifo? > How would I create a pipe or fifo from ffmpeg that Gephex will read. > > Thanks! > jt --Apple-Mail-1--89264374 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=US-ASCII <HTML><BODY style=3D"word-wrap: break-word; -khtml-nbsp-mode: space; = -khtml-line-break: after-white-space; ">Hi everyone... I tried to post = to the user list but it doesn't seem to be responding so I am forwarding = my question to the development list. Please let me know if I shouldn't = send my noob questions to this list.<DIV><BR = class=3D"khtml-block-placeholder"></DIV><DIV>Thanks,</DIV><DIV>jt<BR><DIV>= <BR><DIV>Begin forwarded message:</DIV><BR = class=3D"Apple-interchange-newline"><BLOCKQUOTE type=3D"cite"><DIV = style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; = margin-left: 0px; "><FONT face=3D"Helvetica" size=3D"3" color=3D"#000000" = style=3D"font: 12.0px Helvetica; color: #000000"><B>From: = </B></FONT><FONT face=3D"Helvetica" size=3D"3" style=3D"font: 12.0px = Helvetica">Jay Thompson <<A = href=3D"mailto:[email protected]">[email protected]</A>></F= ONT></DIV><DIV style=3D"margin-top: 0px; margin-right: 0px; = margin-bottom: 0px; margin-left: 0px; "><FONT face=3D"Helvetica" = size=3D"3" color=3D"#000000" style=3D"font: 12.0px Helvetica; color: = #000000"><B>Date: </B></FONT><FONT face=3D"Helvetica" size=3D"3" = style=3D"font: 12.0px Helvetica">August 7, 2007 2:22:07 PM PDT = (CA)</FONT></DIV><DIV style=3D"margin-top: 0px; margin-right: 0px; = margin-bottom: 0px; margin-left: 0px; "><FONT face=3D"Helvetica" = size=3D"3" color=3D"#000000" style=3D"font: 12.0px Helvetica; color: = #000000"><B>To: </B></FONT><FONT face=3D"Helvetica" size=3D"3" = style=3D"font: 12.0px Helvetica"><A = href=3D"mailto:[email protected]">[email protected]<= /A></FONT></DIV><DIV style=3D"margin-top: 0px; margin-right: 0px; = margin-bottom: 0px; margin-left: 0px; "><FONT face=3D"Helvetica" = size=3D"3" color=3D"#000000" style=3D"font: 12.0px Helvetica; color: = #000000"><B>Subject: </B></FONT><FONT face=3D"Helvetica" size=3D"3" = style=3D"font: 12.0px Helvetica"><B>yuv4mpeg from = ffmpeg?</B></FONT></DIV><DIV style=3D"margin-top: 0px; margin-right: = 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; = "><BR></DIV> <DIV style=3D"margin-top: 0px; margin-right: 0px; = margin-bottom: 0px; margin-left: 0px; ">Hi All... I posted originally to = the devel list accidently but it's probably better if I use the user = list. I've been trying to find a way to get a live signal from my DV = camcorder into Gephex. I've been making progress using ffmpeg but also = had trouble getting it to read the camera. So now I am using dvgrab = piped to ffmpeg and that seems to work well. If I write to a MP4 the = process soaks up about 15% of my cpu and writing to YUV takes up about = 6% (combined dvgrab and ffmpeg). Both are acceptable.</DIV><DIV = style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; = margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style=3D"margin-top: = 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">What I'm = trying to accomplish is a yuv4mpeg stream from ffmpeg that Gephex can = read. It seems ffmpeg will do this but I'm going in circles and could = use some advice. I've read many things on the web, man pages, readme's, = etc... but am missing something. Does the Gephex yuv4mpeg module read = from a fifo file or is the stream piped from ffmpeg to Gephex? The = Gephex y4m module won't even see any of my mkfifo files. With other = attempts Gephex just shows a green screen - I probably need to convert = the video from 4:1:1 to 4:2:2 or 4:2:0 er something. This doesn't really = matter at this point because mostly I get unrecognized header = errors.</DIV><DIV style=3D"margin-top: 0px; margin-right: 0px; = margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV = style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; = margin-left: 0px; ">To be a little more concise - To get a yuv4mpeg = stream into Gephex from ffmpeg:</DIV><DIV style=3D"margin-top: 0px; = margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Do I use a = pipe or a fifo?</DIV><DIV style=3D"margin-top: 0px; margin-right: 0px; = margin-bottom: 0px; margin-left: 0px; ">How would I create a pipe or = fifo from ffmpeg that Gephex will read.</DIV><DIV style=3D"margin-top: = 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; = min-height: 14px; "><BR></DIV><DIV style=3D"margin-top: 0px; = margin-right: 0px; margin-bottom: 0px; margin-left: 0px; = ">Thanks!</DIV><DIV style=3D"margin-top: 0px; margin-right: 0px; = margin-bottom: 0px; margin-left: 0px; ">jt</DIV> = </BLOCKQUOTE></DIV><BR></DIV></BODY></HTML>= --Apple-Mail-1--89264374-- --===============0774920569== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ gephex-devel mailing list [email protected] http://lists.gephex.org/mailman/listinfo/gephex-devel --===============0774920569==--