Hans Verkuil wrote:
On Thursday 23 August 2007 18:00:50 Daniel Selinger wrote:
Hi,
I have a problem where you hopefully can help me with.
closing the device and reopening it is also no option because this
way i loose around 2 seconds between two files.
The second option is to use the new VIDIOC_ENCODER_CMD ioctl to stop and
start the encoder each hour. You have to set the
V4L2_ENC_CMD_STOP_AT_GOP_END flag for the STOP command which ensures
that the stream is ended correctly at a GOP boundary (even the program
stream end marker is filled in). After executing the STOP command you
will need to keep on reading until read() returns 0 (end of file). Only
then can you close the file and open a new one.
After that you can either just read() again (this will kickstart the
encoder) or explicitly call the VIDIOC_ENCODER_CMD ioctl with the
V4L2_ENC_CMD_START command.
> Based on some experimentation it looks like the second option might be
best: the MPEG files are guaranteed to be well-formed and the time lost
between the stop/start looks to be minimal.
> Regards,
Hans
Once he does the close ioctl call, couldn't he start writing the output
to both files? The first file would be closed/truncated correctly, and
the 2nd file would have an additional little bit of overlap, so there wouldn't
be anything lost, and just a tiny bit of extra? Then when he gets the
0 return, just close the old file?
--
Mark Paulus
2424 Garden of the Gods Rd | Phone: v622-5578 / 719-535-5578
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Colo Springs, CO 80919 | 1800PageMCI / 1406052
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