On 09.09.2020 11:50, Tobias Rapp wrote:
[...]
When looking at the first few audio packets with
ffprobe the DTS values seem to be in increasing order:
[PACKET]
codec_type=audio
stream_index=0
pts=0
pts_time=0.000000
dts=0
dts_time=0.000000
duration=170
duration_time=0.170000
convergence_duration=N/A
convergence_duration_time=N/A
size=1366
pos=93710
flags=K_
[/PACKET]
[PACKET]
codec_type=audio
stream_index=0
pts=128
pts_time=0.128000
dts=128
dts_time=0.128000
duration=170
duration_time=0.170000
convergence_duration=N/A
convergence_duration_time=N/A
size=1366
pos=114110
flags=K_
[/PACKET]
[PACKET]
codec_type=audio
stream_index=0
pts=298
pts_time=0.298000
dts=298
dts_time=0.298000
duration=170
duration_time=0.170000
convergence_duration=N/A
convergence_duration_time=N/A
size=1366
pos=120910
flags=K_
[/PACKET]
[PACKET]
codec_type=audio
stream_index=0
pts=437
pts_time=0.437000
dts=437
dts_time=0.437000
duration=170
duration_time=0.170000
convergence_duration=N/A
convergence_duration_time=N/A
size=1366
pos=134510
flags=K_
[/PACKET]
[...]
The problem seems to be that DTS increases in different steps than what
is reported in "duration". When I add a filter option string like
"asetpts=N/SR/TB" the transcoding succeeds but there is a noticeable A/V
delta of about 2 video frames.
Does anybody know if the wmav2 decoder produces some codec delay and how
to compensate that?
Regards, Tobias
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