I'm reporting what I've learned, hoping to share what I have with
others, hoping to get similiar experiences.
I'm recording ATSC streams using a pcHDTV HD5500 card. The script I use
for recording is at the bottom of this thread. This card dumps out
MPEG2 transport streams.
I have an NVIDIA FX 5200 AGP 8X card for playback. I'm using the NVIDIA
binary drivers on linux. I'm trying to play back using a 2.4Ghz P4 with
a 400 Mhz FSB, no hyper threading. The NVIDIA drivers support the xvmc
MPEG2 acceleration features.
When I attempt to play these MPEG Transport Streams using mplayer, both
mplayer and Xorg consume 100% of the processor. The result is not at
all acceptable.
When I attempt to play these MPEG Transport Streams using xine, the
video plays fine, the CPU usage is very low (<20%), however, I don't get
any audio.
I then used the dvb-mpegtools ts2ps program to convert the transport
streams to program streams.
When I play the program stream with mplayer, I get the same results, the
entire CPU is consumed.
When I play the program stream with xine, I get audio and the CPU usage
is still < 20%. It's a workable solution.
I don't know why mplayer has trouble with these streams while xine seems
to be able to play the program stream properly.
#!/bin/bash
# 1: video device
# 2: channel
# 3: time in seconds
# 4: recording file
kill_it()
{
echo "Caught SIGINT ..."
echo "PID $SLEEP_PID"
kill $SLEEP_PID
kill $CAT_PID
kill $AZAP_PID
exit
}
trap 'kill_it' INT TERM
sleep 2
azap -r $2 > /dev/null 2>&1 &
AZAP_PID=$!
cat $1 > $4 &
CAT_PID=$!
# $! is PID of last job running in background.
sleep $3 &
SLEEP_PID=$!
wait $SLEEP_PID
# You should add some check here to make sure cat is still running,
# otherwise you might accidentally kill some other process.
kill $CAT_PID
kill $AZAP_PID
Jim
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