Invalid buffer timestamp; dropping buffer?

[Michael Gruner]

They should be equivalent, so the problem must be somewhere in the python code. Maybe you can share a minimal example of your failing code.

> On Jun 12, 2019, at 7:39 AM, pisymbol . <pisymbol at gmail.com> wrote:
> 
> I have a multistage pipeline that looks like this:
> 
> gst-launch-1.0 -v -e matroskamux name="muxer" streamable=true ! multifilesink post-messages=true next-file=5 max-file-duration=60000000000 location=capture.mkv \
>   nvcamerasrc fpsRange="30.0 30.0" aeLock=true sensor_id=0 \
>   ! 'video/x-raw(memory:NVMM), width=(int)4104, height=(int)3046, format=(string)I420, framerate=(fraction)30/1' \
>   ! nvvidconv flip-method=3 ! 'video/x-raw(memory:NVMM), width=(int)1520, height=(int)2704, format=(string)I420' \
>   ! omxh264enc bitrate=10000000 ! 'video/x-h264, stream-format=(string)byte-stream' ! h264parse ! muxer.video_0 \
>   nvcamerasrc fpsRange="30.0 30.0" aeLock=true sensor_id=1 \
>   ! 'video/x-raw(memory:NVMM), width=(int)4104, height=(int)3046, format=(string)I420, framerate=(fraction)30/1' \
>   ! nvvidconv flip-method=3 ! 'video/x-raw(memory:NVMM), width=(int)1520, height=(int)2704, format=(string)I420' \
>   ! omxh264enc bitrate=10000000 ! 'video/x-h264, stream-format=(string)byte-stream' ! h264parse ! muxer.video_1 
> 
> Basically, I'm trying to capture streams from two cameras and mux them into one mkv file. This works on the command line and I can view the capture without issue.
> 
> However, when I try to import this into PyGst using parse_from_description() I don't get any output at all! I also don't get any explicit errors either. Instead I see this continuously:
> 
> 0:00:03.297571465 11548   0x7f800021e0 WARN             matroskamux matroska-mux.c:3558:gst_matroska_mux_write_data:<muxer:video_0> Invalid buffer timestamp; dropping buffer
> 0:00:03.298439263 11548   0x7f84003b20 WARN             matroskamux matroska-mux.c:3558:gst_matroska_mux_write_data:<muxer:video_1> Invalid buffer timestamp; dropping buffer
> 0:00:03.310016224 11548   0x7f800021e0 WARN             matroskamux matroska-mux.c:3558:gst_matroska_mux_write_data:<muxer:video_0> Invalid buffer timestamp; dropping buffer
> 0:00:03.317109682 11548   0x7f84003b20 WARN             matroskamux matroska-mux.c:3558:gst_matroska_mux_write_data:<muxer:video_1> Invalid buffer timestamp; dropping buffer
> 0:00:03.340857644 11548   0x7f800021e0 WARN             matroskamux matroska-mux.c:3558:gst_matroska_mux_write_data:<muxer:video_0> Invalid buffer timestamp; dropping buffer
> 0:00:03.348889524 11548   0x7f84003b20 WARN             matroskamux matroska-mux.c:3558:gst_matroska_mux_write_data:<muxer:video_1> Invalid buffer timestamp; dropping buffer
> 0:00:03.376322341 11548   0x7f800021e0 WARN             matroskamux matroska-mux.c:3558:gst_matroska_mux_write_data:<muxer:video_0> Invalid buffer timestamp; dropping buffer
> 0:00:03.377022270 11548   0x7f84003b20 WARN             matroskamux matroska-mux.c:3558:gst_matroska_mux_write_data:<muxer:video_1> Invalid buffer timestamp; dropping buffer
> 
> I'm not sure how to debug this. Googling suggests this is a latency issue but I don't see that could be since gst-launch-1.0 again works fine. Somewhere something got lost in translation.
> 
> NOTE: I've already set do_timestamp=true for the nvcamerasrc to no avail.
> 
> Any suggestions?
> 
> -aps
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