On Sun, 21 Dec 2008, Artem Makhutov wrote: > I have recorded the stream to a file and will try to playback it under windows. > My CPU is too slow to playback the stream without GPU acceleration under linux. A common occurrence, I say, fondling my beloved 200MHz production machine that records four streams flawlessly (save for two devices being USB1 and thus only good for radio or selected TV clamped to a maximum bitrate, for now) I pass all my recordings through a two-pass process to check for problems (for radio, obviously just one pass) I have a script that extracts the audio payload using a hack to `dvb_mpegtools' and passes it to `mpg123'. The `dvb_mpegtools' serves to check the integrity of the Transport Stream (usually when bad weather affects my satellite reception, or when my DVB-T receiving antenna is placed in a poor location); `mpg123 -v -t' zips through the file and spits out any corrupted audio frames. (The version of mpg123 I use doesn't seem to do anything with the CRC when used, and it gets confused when the CRC is toggled during a stream, which has happened a few times during recordings I've made. That's something which I should work on, because I have a few recordings with audible blorps that pass the `mpg123' test, probably due to flipped bits in the payload rather than dropped data.) Then I use `mplayer' to check the video, using the options `-nosound -vo null' and in the case of MPEG-2 video, `-vc ffmpeg12'. This will spit out errors due to corruption of the video data -- though you need to hack in some newlines if you want to actually see the PTS timestamp where the error(s) occurred. For H.264 video, there is no alternative to `-vc ffh264' that I know of, but it will similarly spew out errors if there's damage to your source. Sure, it takes my machines more than a day to chew through an hour of H.264 1080i video, but I know whether I need to re-record the programme later to get a clean file that I can watch in some ten years when people throw away the gamer machines of today. Yeah, I'm cheap. What of it? That's a lot easier than suffering eyestrain watching a screen for some scarcely-visible corruption, which I used to do long ago... barry bouwsma stingy scrooge _______________________________________________ linux-dvb mailing list linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
