On 17/01/2008, at 3:34 PM, Steven M. Schultz wrote: > > On Wed, 16 Jan 2008, Christian Ebert wrote: > >> I get buffer underflows for longer stuff when encoding from dv to >> mpeg2 for dvd with ffmpeg, and i really played around a lot with > > That's the rate control issue(s) I had in mind.
I found that ffmpeg had trouble with DV files. When I did direct conversions from DV to mpeg2 dvd constrained files, I found some strangeness that caused the frame rate of the dv file to increase, or drop frames, and therefore reduce the duration of the movie. Due to the non-contiguous nature of the resulting dv file, the bitrate of the mpeg file would increase and couldn't be controlled. I would always need to go via another tool before making the mpeg2 file with ffmpeg. > >> the ever changing options... > > Yep - hard to keep up sometimes. > >> But I'd like to decode with lav2yuv, but it segfaults here on dv movs > > Works fine here - BUT I have seen the problem you mentioned earlier > (symptom is that 'twos' audio isn't recognized as valid). I have some hacky code which uses libav to do decoding (really wanted it after WMV3 support was added) to yuv4mpeg check out: http://silicontrip.net/~mark/lavtools/ http://silicontrip.net/~mark/lavtools/libav2yuv.c Maybe someone could make it a little more compiler friendly. I think that it doesn't compile with the latest version of libav, and needs some libav_open calls changes (and structs made into pointers) and I need a cvs system at home! >> There's an Apple compressor for mpeg2? > > And 3gpp, H.264, AC3, MPEG-1, AAC, MPEG-4 and a bunch of others I'd > have to lookup. "Compressor" (I'm only at Compressor2, not having > upgraded to 3) is Apple's compression engine frontend. It's not > sold separately but only as part of the Final Cut Studio bundle > (a bit pricey but a fair value for the amount of software and > documentation you get). Although doesn't come with mpeg2 encoding (or decoding, unless the quicktime component is installed) have a look at MPEG Streamclip http://www.squared5.com/ Mark “What if Microsoft had designed Windows Vista.” ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Mjpeg-users mailing list Mjpeg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mjpeg-users
