// ffmpeg-devel@ffmpeg.org
Hi,
I was experimenting with using ffplay to display cameras from my DVR video
recorder'srtsp stream.
This works perfectly (Chinse video recoder with H264 outoput for4 cameras) like
this:
/root/compile/ffmpeg/ffmpeg-1.1/ffplay
'rtsp://192.168.178.80:554/user=admin_password=PASSWORD_channel=1_stream=0.sdp?real_stream?tcp'
As I found no way to record from it at the same time?? (maybe ffmpeg can but no
luck so far),
I decided to try to add some output stream to fflay.
I modified ffplay.c
in function:
static int video_thread(void *arg)
Afte:
ret = get_video_frame(is, frame, &pts_int, &pkt, &serial);
if (ret < 0)
goto the_end;
if (!ret)
continue;
I added:
/* Start PANTELTJE MOD */
#include <unistd.h>
//fprintf(stderr, "WAS 1 pkt.size=%d\n", pkt.size);
// ssize_t write(int fd, const void *buf, size_t count);
write(fileno(stdout), pkt.data, pkt.size);
/* end PANTELTJE MOD */
Recompiled, then use it like this:
ffplay
'rtsp://192.168.178.80:554/user=admin_password=PASSWORD_channel=1_stream=0.sdp?real_stream?tcp'
1>myfile.mp4
Amazingly this worked first time, and I can play it back no problem with an
unmodified version of ffplay :-)
There is _one_ problem however, the recorded file plays back at what looks like
double speed.
I was thinking about adding a command line option to ffplay to enable the 'dump
to stdout' modification,
but am taken aback by why I do not understand the double speed effect in
playback.
I know very little about H264 sooo
What is going on here?
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