On Monday 24 November 2003 06:06, Florin Andrei wrote:
> Can someone explain to me how's mplex -O supposed to work?
>
> I'm using the current (sunday nov 23, in the evening) mjpegtools CVS
> tree.
>
> I'm doing this:
>
> mplex -f 8 -S 150 -O 500 ${proj}.m2v ${proj}.ac3 -o 1.vob
>
> mplex -f 8 -S 150 -O -500 ${proj}.m2v ${proj}.ac3 -o 2.vob
>
> Then i compare the sync info on the two VOBs like this:
...
Looks like either:
- whatever you're running it is *not* actually a build based on the current
CVS contents (sticky tags set? Local changes?)
- There is some kind of tricky Compiler-dependent bug at work
Binary built from a fresh checkout of the main branch from CVS.
mplex -f 8 -O 500 test.m2v test.ac3 -o test.mpg
Pack [0x800]
scr = 146:85
mux = 25200 - (1260000 bytes/second)
stuffing = 0
Packet [0x80e]
stream_id = 0xe0 (video_stream)
...
PTS = 61773 <------------------------------
DTS = 58019
extension_data -
private_data_flag = 0
...
Pack [0x1000]
scr = 292:171
mux = 25200 - (1260000 bytes/second)
stuffing = 0
Packet [0x100e]
stream_id = 0xbd (private_stream_1)
...
pes_header_data_length = 8
PTS = 16773 <--------------- Exactly 500mS earlier
extension_data -
....
DVD AC3 audio substream = 80
frames = 2
1st frame start = 1
AC3 frame syncword
CRC
frequency = 48000 Hz
bit rate = 0320 bps
bitstream version id (bsid) = 8
bitstream mode 0x0 (main, complete)
acmode = 2
mplex -f 8 -O -500 test.m2v test.ac3 -o test.mpg
Pack [0x800]
scr = 146:85
mux = 25200 - (1260000 bytes/second)
stuffing = 0
Packet [0x80e]
stream_id = 0xe0 (video_stream)
...
PTS = 16773 <----------------
DTS = 13019
...
Pack [0x61800]
scr = 28525:214
mux = 25200 - (1260000 bytes/second)
stuffing = 0
Packet [0x6180e]
stream_id = 0xbd (private_stream_1)
....
PTS = 61773 <-------------- Exactly 500 mSec later...
extension_data -
private_data_flag = 0
pack_header_field_flag = 0
program_packet_sequence_counter_flag = 0
P-STD_buffer_flag = 1
PES_extension_flag_2 = 0
P-STD_buffer_scale = 1
P-STD_buffer_size = 16
P-STD_actual_buffer_size = 16384
DVD AC3 audio substream = 80
frames = 2
...
Playback with xine has the expect very-noticeable effect on video/audio sync.
Andrew
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