[FFmpeg-user] writing to multiple outputs causes extra messages?

[Roger Pack]

Hello.
I noticed that with this command, if I write to "just" a file named
output.mpg , or "just" a file named output.avi, I get no error
messages.  Writing to both files at the same time, however:

$ ffmpeg -y -i sintel.mpg -f dshow -i video=screen-capture-recorder
-an -filter_complex
"[0]scale=1000:1000,overlay=10:main_h-overlay_h-10"  output.mpg
output2.avi
ffmpeg version N-46649-g0a373c3 Copyright (c) 2000-2012 the FFmpeg developers
  built on Nov 12 2012 15:41:25 with gcc 4.7.1 (GCC)
  configuration: --enable-memalign-hack --arch=x86 --enable-gpl
--enable-libx264 --enable-avisynth --enable-libxv
id --target-os=mingw32
--cross-prefix=/home/rdp/dev/ffmpeg-windows-build-helpers/sandbox/mingw-w64-i686/bin/i686-
w64-mingw32- --pkg-config=pkg-config --enable-libmp3lame
--enable-version3 --enable-libvpx --extra-libs=-lws2_32
--extra-libs=-lpthread --enable-zlib --extra-libs=-lwinmm
--extra-libs=-lgdi32 --enable-librtmp --enable-libvorbi
s --enable-libtheora --enable-libspeex --enable-libopenjpeg
--enable-gnutls --enable-libgsm --enable-libfreetype
--disable-optimizations --enable-mmx --disable-postproc
--enable-fontconfig --enable-libass --enable-libutvideo -
-enable-libopus --disable-w32threads --extra-cflags=-DPTW32_STATIC_LIB
--enable-frei0r --enable-filter=frei0r --e
nable-libvo-aacenc --enable-bzlib --enable-runtime-cpudetect
  libavutil      52.  6.100 / 52.  6.100
  libavcodec     54. 71.100 / 54. 71.100
  libavformat    54. 36.100 / 54. 36.100
  libavdevice    54.  3.100 / 54.  3.100
  libavfilter     3. 22.101 /  3. 22.101
  libswscale      2.  1.102 /  2.  1.102
  libswresample   0. 16.100 /  0. 16.100
[mpeg2video @ 03a5fbe0] ac-tex damaged at 40 7
[mpeg2video @ 03a5fbe0] Warning MVs not available
[mpeg2video @ 03a5fbe0] concealing 1035 DC, 1035 AC, 1035 MV errors in I frame
[mpeg @ 03a5f4e0] max_analyze_duration 5000000 reached at 5024000
Input #0, mpeg, from 'sintel.mpg':
  Duration: 00:14:47.58, start: 0.233367, bitrate: 4132 kb/s
    Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x480
[SAR 32:27 DAR 16:9], 29.97 fps, 29.97 tbr, 90
k tbn, 59.94 tbc
    Stream #0:1[0x80]: Audio: ac3, 48000 Hz, 5.1(side), s16, 448 kb/s
[dshow @ 04cd8300] Estimating duration from bitrate, this may be inaccurate
Input #1, dshow, from 'video=screen-capture-recorder':
  Duration: N/A, start: 20410.431000, bitrate: N/A
    Stream #1:0: Video: rawvideo, bgr24, 300x200, 30 tbr, 10000k tbn, 30 tbc
[mpeg @ 03a617c0] VBV buffer size not set, muxing may fail
Output #0, mpeg, to 'output.mpg':
  Metadata:
    encoder         : Lavf54.36.100
    Stream #0:0: Video: mpeg1video, yuv420p, 1000x1000 [SAR 16:9 DAR
16:9], q=2-31, 200 kb/s, 90k tbn, 29.97 tbc
Output #1, avi, to 'output2.avi':
  Metadata:
    ISFT            : Lavf54.36.100
    Stream #1:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 720x480
[SAR 32:27 DAR 16:9], q=2-31, 200 kb/s, 29.97
 tbn, 29.97 tbc
    Stream #1:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p
Stream mapping:
  Stream #0:0 (mpeg2video) -> scale (graph 0)
  Stream #1:0 (rawvideo) -> overlay:overlay (graph 0)
  overlay (graph 0) -> Stream #0:0 (mpeg1video)
  Stream #0:0 -> #1:0 (mpeg2video -> mpeg4)
  Stream #0:1 -> #1:1 (ac3 -> libmp3lame)
Press [q] to stop, [?] for help
[mpeg2video @ 03a5fbe0] ac-tex damaged at 40 7
[mpeg2video @ 03a5fbe0] Warning MVs not available
[mpeg2video @ 03a5fbe0] concealing 1035 DC, 1035 AC, 1035 MV errors in I frame
[Parsed_overlay_1 @ 03a60c20] Buffer queue overflow, dropping.
    Last message repeated 27 times
Buffer queue overflow, dropping. size=     184kB time=00:00:02.73
bitrate= 550.9kbits/s
[Parsed_overlay_1 @ 03a60c20] Buffer queue overflow, dropping.
    Last message repeated 41 times
Buffer queue overflow, dropping.7 size=     218kB time=00:00:04.83
bitrate= 369.1kbits/s
[Parsed_overlay_1 @ 03a60c20] Buffer queue overflow, dropping.
    Last message repeated 36 times
frame=   40 fps= 28 q=29.8 Lq=31.0 size=     248kB time=00:00:06.55
bitrate= 310.1kbits/s dup=1 drop=0
video:621kB audio:103kB subtitle:0 global headers:0kB muxing overhead
-65.756018%

I...guess this isn't expected?
-roger-