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• ffmpeg : Image2 => Error while opening encoder

  22 novembre 2012, par user1844282

  I get the following error ffmpeg.

  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  ffmpeg -f image2 -i %05d.jpg -vcodec libx264 foo.mp4

  I'm pretty sure I've used this exact command before and it's been fine. This is my terminal output. Any help would be appreciated.

  $ ffmpeg -f image2 -i %05d.jpg -vcodec libx264 foo.mp4
  
  ffmpeg version 1.0 Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Nov 22 2012 17:59:05 with Apple clang version 4.1 (tags/Apple/clang-421.11.66) (based on LLVM 3.1svn)
  
    configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libspeex --enable-libfreetype --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid
  
    libavutil      51. 73.101 / 51. 73.101
  
  
  
    libavcodec     54. 59.100 / 54. 59.100
  
  
  
    libavformat    54. 29.104 / 54. 29.104
  
  
  
    libavdevice    54.  2.101 / 54.  2.101
  
  
  
    libavfilter     3. 17.100 /  3. 17.100
  
  
  
    libswscale      2.  1.101 /  2.  1.101
  
  
  
    libswresample   0. 15.100 /  0. 15.100
  
  
  
    libpostproc    52.  0.100 / 52.  0.100
  
  
  
  Input #0, image2, from '%05d.jpg':
  
    Duration: 00:00:04.44, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: mjpeg, yuvj420p, 1201x900 [SAR 1:1 DAR 1201:900], 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  [libx264 @ 0x7fab0881aa00] width not divisible by 2 (1201x900)
  
  Output #0, mp4, to 'foo.mp4':
  
      Stream #0:0: Video: h264, yuvj420p, 1201x900 [SAR 1:1 DAR 1201:900], q=-1--1, 90k tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mjpeg -> libx264)
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

• Superimposing two videos onto a static image ?

  15 décembre 2014, par Archagon

  I have two videos that I’d like to combine into a single video, in which both videos would sit on top of a static background image. (Think something like this.) My requirements are that the software I use is free, that it runs on OSX, and that I don’t have to re-encode my videos an excessive number of times. I’d also like to be able to perform this operation from the command line or via script, since I’ll be doing it a lot. (But this isn’t strictly necessary.)

  I tried fiddling with ffmpeg for a couple of hours, but it just doesn’t seem very well suited for post-processing. I could potentially hack something together via the overlay feature, but so far I haven’t figured out how to do it, aside from pain-stakingly converting the image to a video (which takes 2x as long as the length of my videos !) and then superimposing the two videos onto it in another rendering step.

  Any tips ? Thank you !

  ---

  Update :

  Thanks to LordNeckbeard’s help, I was able to achieve my desired result with a single ffmpeg call ! Unfortunately, encoding is quite slow, taking 6 seconds to encode 1 second of video. I believe this is caused by the background image. Any tips on speeding up encoding ? Here’s the ffmpeg log :

  MacBook-Pro:Video archagon$ ffmpeg -loop 1 -i underlay.png -i test-slide-video-short.flv -i test-speaker-video-short.flv -filter_complex "[1:0]scale=400:-1[a];[2:0]scale=320:-1[b];[0:0][a]overlay=0:0[c];[c][b]overlay=0:0" -shortest -t 5 -an output.mp4
  
  ffmpeg version 1.0 Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Nov 14 2012 16:18:58 with Apple clang version 4.0 (tags/Apple/clang-421.0.60) (based on LLVM 3.1svn)
  
    configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libspeex --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid
  
    libavutil      51. 73.101 / 51. 73.101
  
    libavcodec     54. 59.100 / 54. 59.100
  
    libavformat    54. 29.104 / 54. 29.104
  
    libavdevice    54.  2.101 / 54.  2.101
  
    libavfilter     3. 17.100 /  3. 17.100
  
    libswscale      2.  1.101 /  2.  1.101
  
    libswresample   0. 15.100 /  0. 15.100
  
    libpostproc    52.  0.100 / 52.  0.100
  
  Input #0, image2, from 'underlay.png':
  
    Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: png, rgb24, 1024x768, 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  Input #1, flv, from 'test-slide-video-short.flv':
  
    Metadata:
  
      author          : 
  
      copyright       : 
  
      description     : 
  
      keywords        : 
  
      rating          : 
  
      title           : 
  
      presetname      : Custom
  
      videodevice     : VGA2USB Pro V3U30343
  
      videokeyframe_frequency: 5
  
      canSeekToEnd    : false
  
      createdby       : FMS 3.5
  
      creationdate    : Mon Aug 16 16:35:34 2010
  
      encoder         : Lavf54.29.104
  
    Duration: 00:50:32.75, start: 0.000000, bitrate: 90 kb/s
  
      Stream #1:0: Video: vp6f, yuv420p, 640x480, 153 kb/s, 8 tbr, 1k tbn, 1k tbc
  
  Input #2, flv, from 'test-speaker-video-short.flv':
  
    Metadata:
  
      author          : 
  
      copyright       : 
  
      description     : 
  
      keywords        : 
  
      rating          : 
  
      title           : 
  
      presetname      : Custom
  
      videodevice     : Microsoft DV Camera and VCR
  
      videokeyframe_frequency: 5
  
      audiodevice     : Microsoft DV Camera and VCR
  
      audiochannels   : 1
  
      audioinputvolume: 75
  
      canSeekToEnd    : false
  
      createdby       : FMS 3.5
  
      creationdate    : Mon Aug 16 16:35:34 2010
  
      encoder         : Lavf54.29.104
  
    Duration: 00:50:38.05, start: 0.000000, bitrate: 238 kb/s
  
      Stream #2:0: Video: vp6f, yuv420p, 320x240, 204 kb/s, 25 tbr, 1k tbn, 1k tbc
  
      Stream #2:1: Audio: mp3, 22050 Hz, mono, s16, 32 kb/s
  
  File 'output.mp4' already exists. Overwrite ? [y/N] y
  
  using cpu capabilities: none!
  
  [libx264 @ 0x7fa84c02f200] profile High, level 3.1
  
  [libx264 @ 0x7fa84c02f200] 264 - core 119 - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - 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=3 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 'output.mp4':
  
    Metadata:
  
      encoder         : Lavf54.29.104
  
      Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1024x768, q=-1--1, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 (png) -> overlay:main
  
    Stream #1:0 (vp6f) -> scale
  
    Stream #2:0 (vp6f) -> scale
  
    overlay -> Stream #0:0 (libx264)
  
  Press [q] to stop, [?] for help

  ---

  Update 2 :

  It works ! One important tweak was to move the underlay.png input to the end of the input list. This increased performance substantially. Here’s my final ffmpeg call. (The maps at the end aren’t required for this particular arrangement, but I sometimes have a few extra audio inputs that I want to map to my output.)

  ffmpeg
  
      -i VideoOne.flv
  
      -i VideoTwo.flv
  
      -loop 1 -i Underlay.png
  
      -filter_complex "[2:0] [0:0] overlay=20:main_h/2-overlay_h/2 [overlay];[overlay] [1:0] overlay=main_w-overlay_w-20:main_h/2-overlay_h/2 [output]"
  
      -map [output]:v
  
      -map 0:a
  
      OutputVideo.m4v

• How to compile c99-to-c89 convertor with clang ?

  27 septembre 2016, par theateist

  I’m trying to compile ffmpeg in windows for VisualStudio and one of the step is to compile c99-to-c89 code with clang according to this post. I managed to create clang.exe but how I compile c99-to-c89 code with it ?

  I changed a little bit the makefile in c99-to-c89 so CC variable points now to clang.exe compiler and not cl.exe

  EXT=.exe
  
  
  
  all: c99conv$(EXT) c99wrap$(EXT)
  
  
  
  CLANGDIR=C:/build
  
  CC=C:/build/bin/Release/clang.exe
  
  CFLAGS=-nologo -Z7 -D_CRT_SECURE_NO_WARNINGS=1 -Dpopen=_popen -Dunlink=_unlink -Dstrdup=_strdup -Dsnprintf=_snprintf -I. -I$(CLANGDIR)/tools/clang/include
  
  LDFLAGS=-nologo -Z7 $(CLANGDIR)/lib/Release/libclang.lib
  
  
  
  clean:
  
      rm -f c99conv$(EXT) c99wrap$(EXT) convert.o compilewrap.o
  
      rm -f unit.c.c unit2.c.c
  
  
  
  test1: c99conv$(EXT)
  
      $(CC) -P unit.c -Fiunit.prev.c
  
      ./c99conv unit.prev.c unit.post.c
  
      diff -u unit.{prev,post}.c
  
  
  
  test2: c99conv$(EXT)
  
      $(CC) -P unit2.c -Fiunit2.prev.c
  
      ./c99conv unit2.prev.c unit2.post.c
  
      diff -u unit2.{prev,post}.c
  
  
  
  test3: c99conv$(EXT)
  
      $(CC) $(CFLAGS) -P -Ficonvert.prev.c convert.c
  
      ./c99conv convert.prev.c convert.post.c
  
      diff -u convert.{prev,post}.c
  
  
  
  c99conv$(EXT): convert.o
  
      $(CC) -Fe$@ $< $(LDFLAGS) $(LIBS)
  
  
  
  c99wrap$(EXT): compilewrap.o
  
      $(CC) -Fe$@ $< $(LDFLAGS)
  
  
  
  %.o: %.c
  
      $(CC) $(CFLAGS) -Fo$@ -c $<

  but when I run make command I get clang: error: unsupported use of internal gcc -Z option '-Z7'. I guess the problem in CFLAGS and LDFLAGS but I don’t know how to fix it because the lack of knowledge in makefile and clang.