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• Duplicated frames when mering multiple videos with xfade filter (ffmpeg)

  25 février 2021, par tjk

  I'm stuck with merging multiple videos with audio. This used to work on most videos I merged before but with some videos, I get the "More than 1000 frames duplicated" warning, and the output video is broken (some videos won't play, just static picture and the sound is misaligned).

  


  All videos are in the same format afaik. The only difference I see is that some are "yuvj420p(pc)" and most are "yuv420p". But I tried merging without those with "yuvj420p(pc)" and it didn't help.

  


  Already tried adding "-vsync vfr", didn't help too.
Interestingly — if I remove the second or the last input video, no warning is given and it all works.

  


  The command I use :

  


  ffmpeg  -i intro.mp4 \
     -i 2043651222.mp4 \
     -i 2668231460.mp4 \
     -i 2342967217.mp4 \
     -i 2345792509.mp4 \
     -i 2764881879.mp4 \
     -i 3127825310.mp4 \
     -i 3058954129.mp4 \
     -i 2533841315.mp4 \
     -i 2334544474.mp4 \
     -i 2493440007.mp4 \
     -filter_complex \
"[0][1]xfade=transition=fade:duration=0.5:offset=3.5000000[V01]; \
[V01][2]xfade=transition=fade:duration=0.5:offset=7.67000[V02]; \
[V02][3]xfade=transition=fade:duration=0.5:offset=27.21000[V03]; \
[V03][4]xfade=transition=fade:duration=0.5:offset=37.01000[V04]; \
[V04][5]xfade=transition=fade:duration=0.5:offset=54.11000[V05]; \
[V05][6]xfade=transition=fade:duration=0.5:offset=56.63000[V06]; \
[V06][7]xfade=transition=fade:duration=0.5:offset=80.49000[V07]; \
[V07][8]xfade=transition=fade:duration=0.5:offset=107.23000[V08]; \
[V08][9]xfade=transition=fade:duration=0.5:offset=110.12000[V09]; \
[V09][10]xfade=transition=fade:duration=0.5:offset=118.31000,format=yuv420p[video]; \
[0:a]aresample=async=1:first_pts=0,apad,atrim=0:4[A0]; \
[1:a]aresample=async=1:first_pts=0,apad,atrim=0:4.67[A1]; \
[2:a]aresample=async=1:first_pts=0,apad,atrim=0:20.04[A2]; \
[3:a]aresample=async=1:first_pts=0,apad,atrim=0:10.3[A3]; \
[4:a]aresample=async=1:first_pts=0,apad,atrim=0:17.6[A4]; \
[5:a]aresample=async=1:first_pts=0,apad,atrim=0:3.02[A5]; \
[6:a]aresample=async=1:first_pts=0,apad,atrim=0:24.36[A6]; \
[7:a]aresample=async=1:first_pts=0,apad,atrim=0:27.24[A7]; \
[8:a]aresample=async=1:first_pts=0,apad,atrim=0:3.39[A8]; \
[9:a]aresample=async=1:first_pts=0,apad,atrim=0:8.69[A9]; \
[10:a]aresample=async=1:first_pts=0,apad,atrim=0:14.88[A10]; \
[A0][A1]acrossfade=d=0.5:c1=tri:c2=tri[A0001]; \
[A0001][A2]acrossfade=d=0.5:c1=tri:c2=tri[A0002]; \
[A0002][A3]acrossfade=d=0.5:c1=tri:c2=tri[A0003]; \
[A0003][A4]acrossfade=d=0.5:c1=tri:c2=tri[A0004]; \
[A0004][A5]acrossfade=d=0.5:c1=tri:c2=tri[A0005]; \
[A0005][A6]acrossfade=d=0.5:c1=tri:c2=tri[A0006]; \
[A0006][A7]acrossfade=d=0.5:c1=tri:c2=tri[A0007]; \
[A0007][A8]acrossfade=d=0.5:c1=tri:c2=tri[A0008]; \
[A0008][A9]acrossfade=d=0.5:c1=tri:c2=tri[A0009]; \
[A0009][A10]acrossfade=d=0.5:c1=tri:c2=tri[audio] \
" -map "[video]" -map "[audio]" -movflags +faststart 'compiled.mp4'


  


  Full log :

  


  ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with Apple clang version 11.0.3 (clang-1103.0.32.62)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.1 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'intro.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:00:04.00, start: 0.000000, bitrate: 98 kb/s
    Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 2 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
    Stream #0:1(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x1280 [SAR 1:1 DAR 9:16], 85 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '2043651222.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
  Duration: 00:00:04.67, start: 0.000000, bitrate: 471 kb/s
    Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc), 720x1280 [SAR 1:1 DAR 9:16], 333 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 129 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from '2668231460.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
  Duration: 00:00:20.04, start: 0.000000, bitrate: 1882 kb/s
    Stream #2:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 720x1280, 1685 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : Core Media Video
    Stream #2:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 191 kb/s (default)
    Metadata:
      handler_name    : Core Media Audio
Input #3, mov,mp4,m4a,3gp,3g2,mj2, from '2342967217.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
  Duration: 00:00:10.30, start: 0.000000, bitrate: 446 kb/s
    Stream #3:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x1280 [SAR 1:1 DAR 9:16], 367 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #3:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 69 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Input #4, mov,mp4,m4a,3gp,3g2,mj2, from '2345792509.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
  Duration: 00:00:17.60, start: 0.000000, bitrate: 2546 kb/s
    Stream #4:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 720x1280, 2342 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : Core Media Video
    Stream #4:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 199 kb/s (default)
    Metadata:
      handler_name    : Core Media Audio
Input #5, mov,mp4,m4a,3gp,3g2,mj2, from '2764881879.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
  Duration: 00:00:03.02, start: 0.000000, bitrate: 1293 kb/s
    Stream #5:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 720x1280, 1110 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : Core Media Video
    Stream #5:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 178 kb/s (default)
    Metadata:
      handler_name    : Core Media Audio
Input #6, mov,mp4,m4a,3gp,3g2,mj2, from '3127825310.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
  Duration: 00:00:24.36, start: 0.000000, bitrate: 401 kb/s
    Stream #6:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x1280 [SAR 1:1 DAR 9:16], 323 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #6:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 69 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Input #7, mov,mp4,m4a,3gp,3g2,mj2, from '3058954129.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
  Duration: 00:00:27.24, start: 0.000000, bitrate: 1723 kb/s
    Stream #7:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 720x1280, 1519 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : Core Media Video
    Stream #7:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 194 kb/s (default)
    Metadata:
      handler_name    : Core Media Audio
Input #8, mov,mp4,m4a,3gp,3g2,mj2, from '2533841315.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
  Duration: 00:00:03.39, start: 0.000000, bitrate: 1807 kb/s
    Stream #8:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 720x1280, 1657 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : Core Media Video
    Stream #8:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 150 kb/s (default)
    Metadata:
      handler_name    : Core Media Audio
Input #9, mov,mp4,m4a,3gp,3g2,mj2, from '2334544474.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
  Duration: 00:00:08.69, start: 0.000000, bitrate: 2675 kb/s
    Stream #9:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 720x1280, 2500 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : Core Media Video
    Stream #9:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 180 kb/s (default)
    Metadata:
      handler_name    : Core Media Audio
Input #10, mov,mp4,m4a,3gp,3g2,mj2, from '2493440007.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
  Duration: 00:00:14.88, start: 0.000000, bitrate: 966 kb/s
    Stream #10:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x1280, 889 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : Core Media Video
    Stream #10:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 69 kb/s (default)
    Metadata:
      handler_name    : Core Media Audio
File 'compiled.mp4' already exists. Overwrite? [y/N] y
Stream mapping:
  Stream #0:0 (aac) -> aresample
  Stream #0:1 (h264) -> xfade:main
  Stream #1:0 (h264) -> xfade:xfade
  Stream #1:1 (aac) -> aresample
  Stream #2:0 (h264) -> xfade:xfade
  Stream #2:1 (aac) -> aresample
  Stream #3:0 (h264) -> xfade:xfade
  Stream #3:1 (aac) -> aresample
  Stream #4:0 (h264) -> xfade:xfade
  Stream #4:1 (aac) -> aresample
  Stream #5:0 (h264) -> xfade:xfade
  Stream #5:1 (aac) -> aresample
  Stream #6:0 (h264) -> xfade:xfade
  Stream #6:1 (aac) -> aresample
  Stream #7:0 (h264) -> xfade:xfade
  Stream #7:1 (aac) -> aresample
  Stream #8:0 (h264) -> xfade:xfade
  Stream #8:1 (aac) -> aresample
  Stream #9:0 (h264) -> xfade:xfade
  Stream #9:1 (aac) -> aresample
  Stream #10:0 (h264) -> xfade:xfade
  Stream #10:1 (aac) -> aresample
  format -> Stream #0:0 (libx264)
  acrossfade -> Stream #0:1 (aac)
Press [q] to stop, [?] for help
[swscaler @ 0x7ff21ef72000] deprecated pixel format used, make sure you did set range correctly
[libx264 @ 0x7ff227827800] using SAR=1/1
[libx264 @ 0x7ff227827800] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x7ff227827800] profile High, level 3.1, 4:2:0, 8-bit
[libx264 @ 0x7ff227827800] 264 - core 160 r3011M cde9a93 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'compiled.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p(progressive), 720x1280 [SAR 1:1 DAR 9:16], q=-1--1, 30 fps, 15360 tbn, 30 tbc (default)
    Metadata:
      encoder         : Lavc58.91.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
    Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      encoder         : Lavc58.91.100 aac
More than 1000 frames duplicated    1024kB time=00:00:47.41 bitrate= 176.9kbits/s dup=597 drop=996 speed=5.81x    
[mp4 @ 0x7ff227815200] Starting second pass: moving the moov atom to the beginning of the filep=1954 speed=4.07x    
frame= 3989 fps=121 q=-1.0 Lsize=   13252kB time=00:02:12.98 bitrate= 816.3kbits/s dup=1946 drop=1954 speed=4.05x    
video:11094kB audio:2036kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.927680%
[libx264 @ 0x7ff227827800] frame I:23    Avg QP:14.09  size: 69236
[libx264 @ 0x7ff227827800] frame P:1195  Avg QP:18.60  size:  6527
[libx264 @ 0x7ff227827800] frame B:2771  Avg QP:21.69  size:   710
[libx264 @ 0x7ff227827800] consecutive B-frames:  3.3% 11.5%  2.6% 82.6%
[libx264 @ 0x7ff227827800] mb I  I16..4: 36.4% 41.9% 21.7%
[libx264 @ 0x7ff227827800] mb P  I16..4:  3.1%  6.0%  1.1%  P16..4: 15.4%  5.5%  2.9%  0.0%  0.0%    skip:66.0%
[libx264 @ 0x7ff227827800] mb B  I16..4:  0.1%  0.1%  0.0%  B16..8: 10.2%  0.6%  0.0%  direct: 0.4%  skip:88.5%  L0:42.8% L1:53.3% BI: 3.8%
[libx264 @ 0x7ff227827800] 8x8 transform intra:55.8% inter:63.6%
[libx264 @ 0x7ff227827800] coded y,uvDC,uvAC intra: 25.6% 42.8% 14.5% inter: 2.7% 2.5% 0.0%
[libx264 @ 0x7ff227827800] i16 v,h,dc,p: 45% 22% 14% 19%
[libx264 @ 0x7ff227827800] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 38% 19% 28%  3%  2%  3%  2%  3%  2%
[libx264 @ 0x7ff227827800] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 32% 17% 15%  6%  7%  8%  5%  6%  4%
[libx264 @ 0x7ff227827800] i8c dc,h,v,p: 55% 15% 23%  7%
[libx264 @ 0x7ff227827800] Weighted P-Frames: Y:2.0% UV:1.7%
[libx264 @ 0x7ff227827800] ref P L0: 68.4% 13.3% 14.4%  3.9%  0.1%
[libx264 @ 0x7ff227827800] ref B L0: 86.0% 12.0%  2.1%
[libx264 @ 0x7ff227827800] ref B L1: 96.9%  3.1%
[libx264 @ 0x7ff227827800] kb/s:683.43
[aac @ 0x7ff22781fc00] Qavg: 2168.180


  


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   ffmpeg version 7.1-full_build-www.gyan.dev Copyright (c) 2000-2024 the FFmpeg developers 
  built with gcc 14.2.0 (Rev1, Built by MSYS2 project) 
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libopenjpeg --enable-libquirc --enable-libuavs3d --enable-libxevd --enable-libzvbi --enable-libqrencode --enable-librav1e --enable-libsvtav1 --enable-libvvenc --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxeve --enable-libxvid --enable-libaom --enable-libjxl --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-liblc3 --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint 
  libavutil      59. 39.100 / 59. 39.100 
  libavcodec     61. 19.100 / 61. 19.100 
  libavformat    61.  7.100 / 61.  7.100 
  libavdevice    61.  3.100 / 61.  3.100 
  libavfilter    10.  4.100 / 10.  4.100 
  libswscale      8.  3.100 /  8.  3.100 
  libswresample   5.  3.100 /  5.  3.100 
  libpostproc    58.  3.100 / 58.  3.100 
Trailing option(s) found in the command: may be ignored. 
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'testVid.mp4': 
  Metadata: 
    major_brand     : isom 
    minor_version   : 512 
    compatible_brands: isomiso2avc1mp41 
    encoder         : Lavf57.83.100 
  Duration: 00:00:02.02, start: 0.000000, bitrate: 12798 kb/s 
  Stream #0:0[0x1](eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuvj420p(pc, progressive), 1280x720 [SAR 1:1 DAR 16:9], 12662 kb/s, 29.74 fps, 30 tbr, 90k tbn (default) 
      Metadata: 
        handler_name    : VideoHandler 
        vendor_id       : [0][0][0][0] 
  Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 121 kb/s (default) 
      Metadata: 
        handler_name    : SoundHandler 
        vendor_id       : [0][0][0][0] 
At least one output file must be specified 


  


  i searched and tried many cases but i don't know where is the problem, any help please ?