Recherche avancée

Sur d’autres sites (7583)

• Rails : Encoder error when converting video using FFMPEG on Heroku

  2 janvier 2013, par andmcgregor

  I'm trying to upload a video and convert the file to mp4 and reduce the file size using the paperclip-ffmpeg and paperclip gems. Everything works fine running a local server and I'm only getting this problem on heroku. I have ffmpeg installed in vendor/ffmpeg/ (I followed these steps : https://gist.github.com/3963576). Here is the code I've got and the error I'm getting :

  models/video.rb :

  class Video < ActiveRecord::Base
  
    attr_accessible :content, :user_id, :video
  
    has_attached_file :video , :styles => { 
  
      :medium => { :geometry => "500x500", :format => 'mp4',
  
          :convert_options => { :output => { :vcodec => 'libx264',
  
          :b => '1000k', :bt => '200k',
  
          :acodec => 'libfaac', :ab => '56k', :ac => 2 } } }
  
    }, :processors => [:ffmpeg]
  
  
  
    belongs_to :user
  
  end

  when I run heroku logs :

  2013-01-02T00:38:20+00:00 app[web.1]: Started POST "/videos" for 101.170.255.251 at 2013-01-02 00:38:20 +0000
  
  2013-01-02T00:38:20+00:00 app[web.1]: Processing by VideosController#create as HTML
  
  2013-01-02T00:38:20+00:00 app[web.1]:   Parameters: {"utf8"=>"✓", "authenticity_token"=>"X0IKts46TF8aFvEb1I/szFo/28omlVBXIIyJ3APz3YA=", "video"=>{"content"=>"", "video"=>#quicktime\r\n", @tempfile=#tmp/RackMultipart20130102-2-1ch9zcp>>}, "commit"=>"Post"}
  
  2013-01-02T00:38:20+00:00 app[web.1]: [paperclip] [ffmpeg] ffmpeg -i "/tmp/sample20130102-2-4j5sgh.mov" 2>&1
  
  2013-01-02T00:38:20+00:00 app[web.1]: [paperclip] [ffmpeg] Resize
  
  2013-01-02T00:38:20+00:00 app[web.1]: [paperclip] [ffmpeg] Command Success
  
  2013-01-02T00:38:20+00:00 app[web.1]: [paperclip] [ffmpeg] Making...
  
  2013-01-02T00:38:20+00:00 app[web.1]: [paperclip] [ffmpeg] Building Destination File: 'sample20130102-2-4j5sgh' + 'mp4'
  
  2013-01-02T00:38:20+00:00 app[web.1]: [paperclip] [ffmpeg] Destination File Built
  
  2013-01-02T00:38:20+00:00 app[web.1]: [paperclip] [ffmpeg] Adding Source
  
  2013-01-02T00:38:20+00:00 app[web.1]: [paperclip] [ffmpeg] Adding Geometry
  
  2013-01-02T00:38:20+00:00 app[web.1]: [paperclip] [ffmpeg] Convert Options: 500x280
  
  2013-01-02T00:38:20+00:00 app[web.1]: [paperclip] [ffmpeg] Adding Format
  
  2013-01-02T00:38:20+00:00 app[web.1]: [paperclip] [ffmpeg] -i :source -y -vcodec libx264 -b 1000k -bt 200k -acodec libfaac -ab 56k -ac 2 -s 500x280 :dest
  
  2013-01-02T00:38:20+00:00 app[web.1]: [paperclip] [ffmpeg] Extracting Target Dimensions
  
  2013-01-02T00:38:20+00:00 app[web.1]: [paperclip] [ffmpeg] Building Parameters
  
  2013-01-02T00:38:20+00:00 app[web.1]: [paperclip] [ffmpeg] Target Size is Available
  
  2013-01-02T00:38:20+00:00 app[web.1]: [paperclip] [ffmpeg] Keeping Aspect Ratio
  
  2013-01-02T00:38:20+00:00 app[web.1]: Command :: ffmpeg -i '/tmp/sample20130102-2-4j5sgh.mov' -y -vcodec libx264 -b 1000k -bt 200k -acodec libfaac -ab 56k -ac 2 -s 500x280 '/tmp/sample20130102-2-4j5sgh20130102-2-1mr35ix.mp4'
  
  2013-01-02T00:38:20+00:00 app[web.1]: ffmpeg version git-2013-01-01-d079d1d Copyright (c) 2000-2012 the FFmpeg developers
  
  2013-01-02T00:38:20+00:00 app[web.1]:   built on Jan  1 2013 12:59:49 with gcc 4.4.3 (Ubuntu 4.4.3-4ubuntu5)
  
  2013-01-02T00:38:20+00:00 app[web.1]:   configuration: --enable-shared --disable-asm --prefix=/app/vendor/ffmpeg
  
  2013-01-02T00:38:20+00:00 app[web.1]:   libavfilter     3. 30.102 /  3. 30.102
  
  2013-01-02T00:38:20+00:00 app[web.1]:   libavcodec     54. 85.100 / 54. 85.100
  
  2013-01-02T00:38:20+00:00 app[web.1]:   libavdevice    54.  3.102 / 54.  3.102
  
  2013-01-02T00:38:20+00:00 app[web.1]:   libavutil      52. 13.100 / 52. 13.100
  
  2013-01-02T00:38:20+00:00 app[web.1]:   libswresample   0. 17.102 /  0. 17.102
  
  2013-01-02T00:38:20+00:00 app[web.1]:   libswscale      2.  1.103 /  2.  1.103
  
  2013-01-02T00:38:20+00:00 app[web.1]:   libavformat    54. 58.100 / 54. 58.100
  
  2013-01-02T00:38:21+00:00 app[web.1]:     creation_time   : 2013-01-02 00:36:58
  
  2013-01-02T00:38:21+00:00 app[web.1]:     minor_version   : 0
  
  2013-01-02T00:38:21+00:00 app[web.1]:     major_brand     : qt  
  
  2013-01-02T00:38:21+00:00 app[web.1]: Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/tmp/sample20130102-2-4j5sgh.mov':
  
  2013-01-02T00:38:21+00:00 app[web.1]:     model           : iPhone 4
  
  2013-01-02T00:38:21+00:00 app[web.1]:     compatible_brands: qt  
  
  2013-01-02T00:38:21+00:00 app[web.1]:     model-eng       : iPhone 4
  
  2013-01-02T00:38:21+00:00 app[web.1]:     make-eng        : Apple
  
  2013-01-02T00:38:21+00:00 app[web.1]:     date-eng        : 2012-12-28T00:39:34+1100
  
  2013-01-02T00:38:21+00:00 app[web.1]:     encoder         : 6.0
  
  2013-01-02T00:38:21+00:00 app[web.1]:     encoder-eng     : 6.0
  
  2013-01-02T00:38:21+00:00 app[web.1]:   Duration: 00:00:00.03, start: 0.000000, bitrate: 9465 kb/s
  
  2013-01-02T00:38:21+00:00 app[web.1]:     Stream #0:0(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 75 kb/s
  
  2013-01-02T00:38:21+00:00 app[web.1]:     date            : 2012-12-28T00:39:34+1100
  
  2013-01-02T00:38:21+00:00 app[web.1]:       creation_time   : 2013-01-02 00:36:58
  
  2013-01-02T00:38:21+00:00 app[web.1]:     make            : Apple
  
  2013-01-02T00:38:21+00:00 app[web.1]:   Metadata:
  
  2013-01-02T00:38:21+00:00 app[web.1]:     Metadata:
  
  2013-01-02T00:38:21+00:00 app[web.1]:       handler_name    : Core Media Data Handler
  
  2013-01-02T00:38:21+00:00 app[web.1]:     Stream #0:1(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 8605 kb/s, 30 fps, 30 tbr, 600 tbn, 1200 tbc
  
  2013-01-02T00:38:21+00:00 app[web.1]:     Metadata:
  
  2013-01-02T00:38:21+00:00 app[web.1]:       handler_name    : Core Media Data Handler
  
  2013-01-02T00:38:21+00:00 app[web.1]: Unknown encoder 'libx264'
  
  2013-01-02T00:38:21+00:00 app[web.1]: Please use -b:a or -b:v, -b is ambiguous
  
  2013-01-02T00:38:21+00:00 app[web.1]:       creation_time   : 2013-01-02 00:36:58
  
  2013-01-02T00:38:21+00:00 app[web.1]: [paperclip] An error was received while processing: #
  
  2013-01-02T00:38:21+00:00 app[web.1]:   Rendered videos/new.html.erb within layouts/application (3.2ms)
  
  2013-01-02T00:38:21+00:00 heroku[router]: at=info method=POST path=/videos host=stark-sea-5654.herokuapp.com fwd=101.170.255.251 dyno=web.1 queue=0 wait=0ms connect=3ms service=3685ms status=200 bytes=1878
  
  2013-01-02T00:38:21+00:00 app[web.1]:   Rendered layouts/_footer.html.erb (0.0ms)
  
  2013-01-02T00:38:21+00:00 app[web.1]: Completed 200 OK in 342ms (Views: 124.8ms | ActiveRecord: 10.4ms)
  
  2013-01-02T00:38:21+00:00 app[web.1]:   Rendered layouts/_header.html.erb (1.2ms)

  Everything works fine until the message Unknown encoder 'libx264' so I'm thinking it's something to do with ffmpeg perhaps ?

• Conflicting types error using linphone ios sdk

  4 décembre 2013, par VinZ

  I downloaded the linphone sdk for iphone sourcecode and compiled it on my machine. The SDK build was successful after few fixes. But while building the app in Xcode, it is throwing the following error :

  Error 1 :

  /linphone-iphone/submodules/linphone/mediastreamer2/src/utils/ffmpeg-priv.h:78:17: Conflicting types for 'avcodec_alloc_context3'

  Error 2 :

  /linphone-iphone/submodules/linphone/mediastreamer2/src/utils/ffmpeg-priv.h:82:5: Conflicting types for 'avcodec_open2'

  It is coming from mediastreamer2/ffmpeg source code. Any help on how to fix this is highly appreciated.

• Re-creating/matching ffmpeg settings

  8 novembre 2013, par Pete Helgren

  I have an MP4 file that plays pretty much on every browser using either HTML5 or flash fallback (using mediaelement.js). I also have a series of additional video files that I would like to have "match" the one file that does play consistently but I haven't been able to match the ffmpeg settings so it produces a like file. I used ffprobe and got the following results on the file that plays successfully :

  ffprobe version N-53616-g7a2edcf Copyright (c) 2007-2013 the FFmpeg developers
  
  built on May 29 2013 01:21:08 with gcc 4.7.3 (GCC)
  
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  
  ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
  
  amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
  
  enable-libxvid --enable-zlib
  
   libavutil      52. 34.100 / 52. 34.100
  
   libavcodec     55. 12.102 / 55. 12.102
  
   libavformat    55.  7.100 / 55.  7.100
  
   libavdevice    55.  1.101 / 55.  1.101
  
   libavfilter     3. 72.100 /  3. 72.100
  
   libswscale      2.  3.100 /  2.  3.100
  
   libswresample   0. 17.102 /  0. 17.102
  
   libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'MyFile.mp4':
  
   Metadata:
  
    major_brand     : M4V
  
    minor_version   : 1
  
    compatible_brands: M4V mp42isom
  
    creation_time   : 2013-05-29 16:08:29
  
  Duration: 00:01:58.10, start: 0.000000, bitrate: 1155 kb/s
  
   Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 854x480 [SAR 1:1 DAR 427:240], 995 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc
  
  Metadata:
  
    creation_time   : 2013-05-29 16:08:29
  
    handler_name    : Mainconcept MP4 Video Media Handler
  
  Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 157 kb/s
  
  Metadata:
  
    creation_time   : 2013-05-29 16:08:29
  
    handler_name    : Mainconcept MP4 Sound Media Handler

  Following a few guides I found online, I am using the following ffmpeg settings :

  ffmpeg -i {input file name} -y -acodec aac -ac 2 -strict experimental -ab 64k -s 320x240 -vcodec libx264 -pix_fmt yuv420p -preset slow -profile:v baseline -level 30 -maxrate 300k -bufsize 600k -b:v 300k -f mp4 -threads 0 -movflags +faststart {output file name}

  That command produces the following output :

  ffmpeg -i "testin.mp4" -y -acodec aac -ac 2 -strict experimental -ab 64k -s 320x240 -vcodec libx264 -pix_fmt yuv420p -preset slow-profile:v baseline -level 30 -maxrate 300k -bufsize 600k -b:v 300k -f mp4 -threads 0 -movflags +faststart testout.mp4
  
  
  
  ffmpeg version N-53616-g7a2edcf Copyright (c) 2000-2013 the FFmpeg developers  built on May 29 2013 01:21:08 with gcc 4.7.3 (GCC)  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
    libavutil      52. 34.100 / 52. 34.100
  
    libavcodec     55. 12.102 / 55. 12.102
  
    libavformat    55.  7.100 / 55.  7.100
  
    libavdevice    55.  1.101 / 55.  1.101
  
    libavfilter     3. 72.100 /  3. 72.100
  
    libswscale      2.  3.100 /  2.  3.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'testin.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41
  
      creation_time   : 2013-10-01 17:11:42
  
    Duration: 00:04:33.75, start: 0.000000, bitrate: 725 kb/s
  
      Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 320x240 [SAR 1:1 DAR 4:3], 596 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc
  
      Metadata:
  
        creation_time   : 2013-10-01 17:11:42
  
        handler_name    : ?Mainconcept Video Media Handler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 125 kb/s
  
      Metadata:
  
        creation_time   : 2013-10-01 17:11:42
  
        handler_name    : #Mainconcept MP4 Sound Media Handler
  
  [libx264 @ 0000000000358160] using SAR=1/1
  
  [libx264 @ 0000000000358160] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2AVX
  
  [libx264 @ 0000000000358160] profile Constrained Baseline, level 3.0
  
  [libx264 @ 0000000000358160] 264 - core 133 r2334 a3ac64b - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=0 ref=5 deblock=1:0:0 analyse=0x1:0x111 me=umh subme=8 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=cbr mbtree=1 bitrate=300 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=300 vbv_bufsize=600 nal_hrd=none ip_ratio=1.40 aq=1:1.00
  
  
  
  Output #0, mp4, to 'testout.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41
  
      encoder         : Lavf55.7.100
  
     Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 320x240 [SAR 1:1 DAR 4:3], q=-1--1, 300 kb/s, 30k tbn, 29.97 tbc
  
      Metadata:
  
        creation_time   : 2013-10-01 17:11:42
  
        handler_name    : ?Mainconcept Video Media Handler
  
      Stream #0:1(eng): Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, stereo, fltp, 64 kb/s
  
      Metadata:
  
        creation_time   : 2013-10-01 17:11:42
  
        handler_name    : #Mainconcept MP4 Sound Media Handler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> libx264)
  
    Stream #0:1 -> #0:1 (aac -> aac)
  
  Press [q] to stop, [?] for help
  
  frame=  283 fps=0.0 q=21.0 size=     329kB time=00:00:09.30 bitrate= 289.9kbits/
  
  frame=  565 fps=564 q=20.0 size=     760kB time=00:00:18.64 bitrate= 333.7kbits/
  
  frame=  846 fps=564 q=21.0 size=    1179kB time=00:00:28.20 bitrate= 342.5kbits/
  
  frame= 1123 fps=561 q=22.0 size=    1603kB time=00:00:37.33 bitrate= 351.7kbits/
  
  frame= 1376 fps=550 q=25.0 size=    1986kB time=00:00:45.69 bitrate= 356.1kbits/
  
  frame= 1651 fps=550 q=22.0 size=    2377kB time=00:00:55.01 bitrate= 353.9kbits/
  
  frame= 1914 fps=546 q=24.0 size=    2776kB time=00:01:03.70 bitrate= 357.0kbits/
  
  frame= 2181 fps=545 q=24.0 size=    3163kB time=00:01:12.70 bitrate= 356.4kbits/
  
  frame= 2443 fps=543 q=24.0 size=    3566kB time=00:01:21.38 bitrate= 358.9kbits/
  
  frame= 2702 fps=540 q=24.0 size=    3939kB time=00:01:30.04 bitrate= 358.4kbits/
  
  frame= 2965 fps=539 q=24.0 size=    4338kB time=00:01:38.73 bitrate= 359.9kbits/
  
  frame= 3236 fps=539 q=23.0 size=    4731kB time=00:01:48.03 bitrate= 358.7kbits/
  
  frame= 3505 fps=539 q=24.0 size=    5130kB time=00:01:56.75 bitrate= 360.0kbits/
  
  frame= 3765 fps=537 q=26.0 size=    5521kB time=00:02:05.41 bitrate= 360.6kbits/
  
  frame= 4036 fps=538 q=24.0 size=    5905kB time=00:02:14.59 bitrate= 359.4kbits/
  
  frame= 4326 fps=540 q=24.0 size=    6343kB time=00:02:24.10 bitrate= 360.6kbits/
  
  frame= 4606 fps=542 q=27.0 size=    6783kB time=00:02:33.49 bitrate= 362.0kbits/
  
  frame= 4886 fps=543 q=24.0 size=    7168kB time=00:02:42.81 bitrate= 360.7kbits/
  
  frame= 5166 fps=544 q=27.0 size=    7616kB time=00:02:52.13 bitrate= 362.5kbits/
  
  frame= 5456 fps=545 q=24.0 size=    8020kB time=00:03:01.84 bitrate= 361.3kbits/
  
  frame= 5736 fps=546 q=27.0 size=    8458kB time=00:03:11.18 bitrate= 362.4kbits/
  
  frame= 6001 fps=545 q=30.0 size=    8849kB time=00:03:20.17 bitrate= 362.1kbits/
  
  frame= 6264 fps=544 q=27.0 size=    9233kB time=00:03:28.85 bitrate= 362.2kbits/
  
  frame= 6526 fps=544 q=26.0 size=    9611kB time=00:03:37.55 bitrate= 361.9kbits/
  
  frame= 6793 fps=543 q=26.0 size=   10006kB time=00:03:46.51 bitrate= 361.9kbits/
  
  frame= 7076 fps=544 q=24.0 size=   10410kB time=00:03:55.86 bitrate= 361.6kbits/
  
  frame= 7355 fps=544 q=25.0 size=   10835kB time=00:04:05.20 bitrate= 362.0kbits/
  
  frame= 7615 fps=543 q=27.0 size=   11236kB time=00:04:13.88 bitrate= 362.5kbits/
  
  frame= 7883 fps=543 q=25.0 size=   11625kB time=00:04:22.89 bitrate= 362.3kbits/
  
  frame= 8166 fps=544 q=21.0 size=   12040kB time=00:04:32.31 bitrate= 362.2kbits/
  
  Starting second pass: moving header on top of the file
  
  frame= 8203 fps=540 q=-1.0 Lsize=   12417kB time=00:04:33.74 bitrate= 371.6kbits/s
  
  video:10035kB audio:2150kB subtitle:0 global headers:0kB muxing overhead 1.901929%
  
  [libx264 @ 0000000000358160] frame I:41    Avg QP:14.13  size: 18349
  
  [libx264 @ 0000000000358160] frame P:8162  Avg QP:17.24  size:  1167
  
  [libx264 @ 0000000000358160] mb I  I16..4: 24.8%  0.0% 75.2%
  
  [libx264 @ 0000000000358160] mb P  I16..4:  0.4%  0.0%  0.3%  P16..4: 29.1%  6.4%  3.2%  0.0%  0.0%    skip:60.7%
  
  [libx264 @ 0000000000358160] coded y,uvDC,uvAC intra: 66.1% 74.1% 53.1% inter: 15.3% 20.2% 4.0%
  
  [libx264 @ 0000000000358160] i16 v,h,dc,p: 23% 21% 11% 45%
  
  [libx264 @ 0000000000358160] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 25% 14%  6%  7% 7%  7%  6%  7%
  
  [libx264 @ 0000000000358160] i8c dc,h,v,p: 43% 28% 19% 10%
  
  [libx264 @ 0000000000358160] ref P L0: 78.4% 12.6%  4.9%  2.4%  1.7%
  
  [libx264 @ 0000000000358160] kb/s:300.33

  The one problem with the incantation above is that on iPad's and iPhones and some Android tablets all you hear is the audio with no video. But the file listed above (contents of the ffprobe) does not have that problem, it WILL play on an iPad, iPhone, Android tablet. I researched causes for "audio, no video" and the recommendations were all over the deck. But, the file listed in the ffprobe DOES play, so if I can match those settings described by the ffprobe for all of the other videos, they should play consistently as well. My challenge is to match the ffprobe settings using ffmpeg and there doesn't seem to be a 1 to 1 match between what I see in ffprobe and the corresponding settings in ffmpeg (a nice utility would be to have ffprobe output the ffmpeg settings that could be used to create a file of similar format).

  I walked through the ffprobe documentation but couldn't find anything that would produce a format that could be used as input to ffmpeg. Suggestions ?