just an update ... this did not help ... "enc_mpg_buffers=8 enc_vbi_buffers=4" gave me again "Dropping data" errors. going back to 16 and 8. My disk is probably the reason.
M. 2007/10/18, Ma Begaj <[EMAIL PROTECTED]>: > FYI .... I changed mpg buffer to 8 and vbi buffer to 4, because my > mythbox freezed two times in the last 12 hours, while doing 3 > recordings etc. > > always the same error in mythbackend logs ... it is probably disk > problem (too slow), but ivtv options were the only one I changed in > the last few days. This is mythtv error: > > 2007-10-18 11:39:09.508 TFW, Error: Write() -- IOBOUND begin cnt(2048) > free(1023) > 2007-10-18 11:39:09.531 TFW, Error: Write() -- IOBOUND begin cnt(2048) > free(1687) > 2007-10-18 11:39:09.769 TFW, Error: Write() -- IOBOUND end > 2007-10-18 11:39:09.772 TFW, Error: Write() -- IOBOUND begin cnt(2048) > free(1951) > > I will test this now "options ivtv tuner=55 enc_mpg_buffers=8 > enc_vbi_buffers=4". > > M. > > > > 2007/10/17, Ma Begaj <[EMAIL PROTECTED]>: > > 2007/10/17, Hans Verkuil <[EMAIL PROTECTED]>: > > > On Wednesday 17 October 2007 17:01:25 Ma Begaj wrote: > > > > > No, it just means the driver uses more memory. > > > > > > > > sounds good > > > > > > > > > But setting enc_mpg_buffers > > > > > to 16 means that the driver can buffer up to 16 seconds of video > > > > > and it suggests that MythTV is doing other stuff besides reading > > > > > from the video device for a very long time. > > > > > > > > huh? I don't understand this... Does this mean that 16 seconds will > > > > be missing? Or that MythTv will show in LiveTv 16 seconds old stream? > > > > > > No, the fact that you need to do this means that apparently MythTV may > > > stop reading from /dev/video0 for more than 4 seconds (roughly) before > > > continuing. The default buffer size of ivtv is 4 MB (and 1 MB of video > > > is approx. equal to one second of video when recorded at the driver > > > defaults). > > > > > > Basically the driver continually receives MPEG data from the card and > > > stores it into the buffers of the driver. The application has to read > > > from those buffers fast enough, otherwise the buffers fill up and when > > > all buffers are used the driver will have to drop data from the card > > > and you will get missing video in your recordings. As long as you don't > > > see any of those "buffers are full" messages then your video data is > > > OK. > > > > OK, great. thanks for the information. nice to know. > > > > > > > > > > What is the default buffer mpg size? 8 seconds? and vbi? 4 seconds? > > > > > > 4 seconds (4 MB) for MPEG. 1 MB for VBI (which is > 4 seconds, never > > > really calculated this). > > > > OK, I could experiment with enc_mpg_buffers=8, but if there are no > > side effects, I will leave it like this. > > > > Thanks one more time. > > > > M. > > > > > -- > Glauben heißt nicht wissen wollen, was wahr ist ... Nietzsche > -- Glauben heißt nicht wissen wollen, was wahr ist ... Nietzsche _______________________________________________ ivtv-devel mailing list [email protected] http://ivtvdriver.org/mailman/listinfo/ivtv-devel
