On Wed, Jan 1, 2014 at 5:18 PM, Andy Walls <awa...@md.metrocast.net> wrote: > uncompressed video is available from /dev/video32 in an odd Conexant > macroblock format that is called 'HM12' under linux.
I should have been more clear - last I checked it only supported raw video in streaming mode (mmap). So even though the driver has this capability it won't really help. > raw PCM audio samples are available from /dev/video24 Same basic issue, I think it will only acquire audio via ALSA. > Note that /dev/video0 is always MPEG-2 compressed video. > > I assume ffmpeg and mencoder can transcode from MPEG-2 PS to H.264 on > the fly, however, they will consume more CPU to do the decompression of > the MPEG-2 PS. The advantage of working with the MPEG-2 PS as the > source is that one avoids the audio & video synchronization problem one > might encounter working with the separate uncompressed audio & video > streams. Agreed that transcoding is more CPU expensive, but I suspect if he's willing to transcode he can actually get something working today without any modifications to the sources of either the driver or ffmpeg. And as you suggested, it does help avoid the A/V sync problems associated with raw capture. Devin -- Devin J. Heitmueller - Kernel Labs http://www.kernellabs.com -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
