> You will lose one or more TS packets (188bytes) if RS decoder (or some > other step before that) cannot fully recover the packet. Those packets > are usually marked with 'transport error indicator' flag, and mpeg > decoder skips them, or perhaps blindly tries to decode data in them. > Usually results in ugly crap across the screen in a particular section > that was ruined, even if it was only a single TS packet that was > affected. > > -t Thanks for Your reply. After reading some docs about mpeg-TS I still have difficulties to realize the effects of loosing TS packets to the macroblocks (16x16 pixels) of the mpeg-2 video. Is there at least one full macroblock in a TS packet?
I never dealt with mpeg2 on the "macroblock" level in TS, but as you probably read, a single mpeg "frame" will span several TS packets.
To put my question in other words: If my dvb-t device doesn't get the full stream will this always lead to missing macroblocks or can it yield less obvious loss of quality (like unsharpness)?
Losing a single TS packet, in HD, and especially in SD broadcast will not lead to "unsharpness", you will receive visible ruined image artifacts, which usually look like inverted/green/or otherwise random stream of blocks after the missed packet, as mpeg decoder resyncs to try to decode.
Does the type of device influence the qualtity of the recieved stream? (Why do devices differ in prices so much?)
The only difference would be a more sensitive tuner. If your C/N ratio is high, BER is low/or zero, and no continuity errors in the stream, you're getting everything at full quality. If the signal 'isn't perfect' you will get ugly dropouts/noise as described above. _______________________________________________ linux-dvb mailing list linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
