[FFmpeg-trac] #6682(undetermined:new): hstack repeats input frames

[FFmpeg]

#6682: hstack repeats input frames
-------------------------------------+-------------------------------------
             Reporter:  damonmaria   |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  hstack       |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
-------------------------------------+-------------------------------------

Comment (by damonmaria):

 cehoyos: I'm not certain what you're asking for. If it's the command line
 and console when I saved the RTSP streams to file like the files I've been
 using above then it's:
 {{{
 $ ffmpeg -i "rtsp://root:root@192.168.13.104/axis-
 media/media.amp?camera=1" -c:v copy -map 0:0 -t 10 -metadata
 title="rtsp://root:root@192.168.13.104/axis-media/media.amp?camera=1"
 2017-09-22T231000-1.mp4
 ffmpeg version 3.3.4-1~16.04.york0 Copyright (c) 2000-2017 the FFmpeg
 developers
   built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
   configuration: --prefix=/usr --extra-version='1~16.04.york0'
 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
 --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping
 --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa
 --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca
 --enable-libcdio --enable-libflite --enable-libfontconfig --enable-
 libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-
 libmp3lame --enable-libopenjpeg --enable-libopenmpt --enable-libopus
 --enable-libpulse --enable-librubberband --enable-libshine --enable-
 libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-
 libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-
 libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-
 libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl
 --enable-sdl2 --enable-libdc1394 --enable-libiec61883 --enable-chromaprint
 --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
   libavutil      55. 58.100 / 55. 58.100
   libavcodec     57. 89.100 / 57. 89.100
   libavformat    57. 71.100 / 57. 71.100
   libavdevice    57.  6.100 / 57.  6.100
   libavfilter     6. 82.100 /  6. 82.100
   libavresample   3.  5.  0 /  3.  5.  0
   libswscale      4.  6.100 /  4.  6.100
   libswresample   2.  7.100 /  2.  7.100
   libpostproc    54.  5.100 / 54.  5.100
 Input #0, rtsp, from 'rtsp://root:root@192.168.13.104/axis-
 media/media.amp?camera=1':
   Metadata:
     title           : Session streamed with GStreamer
     comment         : rtsp-server
   Duration: N/A, start: 0.249978, bitrate: N/A
     Stream #0:0: Video: h264 (Main), yuvj420p(pc, bt709, progressive),
 800x600 [SAR 1:1 DAR 4:3], 4 fps, 4 tbr, 90k tbn, 180k tbc
 Output #0, mp4, to '2017-09-22T231000-1.mp4':
   Metadata:
     comment         : rtsp-server
     title           : rtsp://root:root@192.168.13.104/axis-
 media/media.amp?camera=1
     encoder         : Lavf57.71.100
     Stream #0:0: Video: h264 (Main) ([33][0][0][0] / 0x0021), yuvj420p(pc,
 bt709, progressive), 800x600 [SAR 1:1 DAR 4:3], q=2-31, 4 fps, 4 tbr, 90k
 tbn, 90k tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
 Press [q] to stop, [?] for help
 [mp4 @ 0x916602e20] Timestamps are unset in a packet for stream 0. This is
 deprecated and will stop working in the future. Fix your code to set the
 timestamps properly
 [mp4 @ 0x916602e20] Non-monotonous DTS in output stream 0:0; previous: 0,
 current: 0; changing to 1. This may result in incorrect timestamps in the
 output file.
 frame=   42 fps= 11 q=-1.0 Lsize=     249kB time=00:00:10.00 bitrate=
 204.3kbits/s speed=2.67x
 video:248kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.541773%
 }}}

 I've been recording videos with a script so haven't noticed the warning
 about "Timestamps are unset" and "Non-monotonous DTS in output stream
 0:0". I don't remember them from when I was testing the script. Does that
 point to a problem? As I said above, I have Wireshark'ed the RTP and RTCP
 packets and they contain random starting, monotonic sequence numbers, and
 the Sender Reports contain NTP timestamps matching the pts in the RTP
 stream.

 Note: my testing previous to this has been on my dev machine using the git
 master version of ffmpeg. I've been dumping the videos from the machine
 the camera is connected to which is (now, just upgraded) ffmpeg 3.3.4.
 Also note, the videos I used above were recorded with 3.3.3. I could
 compile ffmpeg from a git clone on the camera machine too if you would
 prefer.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/6682#comment:9>
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