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• ffmpeg error while converting to mp4 Error while opening encoder for output stream #0.0

  20 mars 2016, par Josh

  I am trying to convert various file types to mp4 to be displayed using ffmpeg, but i keep getting the error :

  Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height

  Another piece that looks important is :

  [libx264 @ 0x93caef0] broken ffmpeg default settings detected

  [libx264 @ 0x93caef0] use an encoding preset (e.g. -vpre medium)

  [libx264 @ 0x93caef0] preset usage : -vpre -vpre

  [libx264 @ 0x93caef0] speed presets are listed in x264 —help

  [libx264 @ 0x93caef0] profile is optional ; x264 defaults to high

  The latest code I am running is :

  ffmpeg -i source -s 320x240 -r 30000/1001 -b 200k -bt 240k -vcodec libx264 -coder 0 -bf 0 -refs 1 -flags2 -wpred-dct8x8 -level 30 -maxrate 10M -bufsize 10M -acodec libfaac -ac 2 -ar 48000 -ab 192k destination

  I have seen a few other people with this issue, but their fixes didn’t work for some reason.

  In case it matters : ultimately this will be used in php, though I am trying to get it working first via putty

  EDIT: : Here is the full thing as requested(using a wmv, have tested wmv and flv) :

       ~ >> ffmpeg -i path.wmv -s 320x240 -r 30000/1001 -b 200k -r 29.97 -bt 240k -vcodec libx264 -coder 0 -bf 0 -refs 1 -flags2 -wpred-dct8x8 -level 30 -maxrate 10M -bufsize 10M -acodec libfaac -ac 2 -ar 48000 -ab 192k path.mp4
  
  FFmpeg version SVN-r26076, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Aug 28 2012 17:55:47 with gcc 4.1.2 20080704 (Red Hat 4.1.2-52)
  
    configuration: --enable-version3 --enable-gpl --enable-nonfree --enable-shared --enable-postproc --enable-avfilter --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvpx --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --disable-ffplay --disable-indevs --disable-outdevs --disable-demuxer=v4l --disable-demuxer=v4l2 --disable-mmx
  
    libavutil     50.36. 0 / 50.36. 0
  
    libavcore      0.16. 1 /  0.16. 1
  
    libavcodec    52.108. 0 / 52.108. 0
  
    libavformat   52.93. 0 / 52.93. 0
  
    libavdevice   52. 2. 3 / 52. 2. 3
  
    libavfilter    1.74. 0 /  1.74. 0
  
    libswscale     0.12. 0 /  0.12. 0
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
  
  
  Seems stream 1 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 29.97 (30000/1001)
  
  Input #0, asf, from 'path.wmv':
  
    Metadata:
  
      SfOriginalFPS   : 299
  
      WMFSDKVersion   : 11.0.6001.7000
  
      WMFSDKNeeded    : 0.0.0.0000
  
      IsVBR           : 0
  
      title           : Wildlife in HD
  
      artist          :
  
      copyright       : © 2008 Microsoft Corporation
  
      comment         : Footage: Small World Productions, Inc; Tourism New Zealand | Producer: Gary F. Spradling | Music: Steve Ball
  
    Duration: 00:00:30.09, start: 8.000000, bitrate: 6977 kb/s
  
      Stream #0.0(eng): Audio: wmav2, 44100 Hz, 2 channels, s16, 192 kb/s
  
      Stream #0.1(eng): Video: vc1, yuv420p, 1280x720, 5942 kb/s, 29.97 tbr, 1k tbn, 1k tbc
  
  File 'path.mp4' already exists. Overwrite ? [y/N] y
  
  [buffer @ 0x9ce9eb0] w:1280 h:720 pixfmt:yuv420p
  
  [scale @ 0x9ce8f70] w:1280 h:720 fmt:yuv420p -> w:320 h:240 fmt:yuv420p flags:0x4
  
  [libx264 @ 0x9ce9ef0] broken ffmpeg default settings detected
  
  [libx264 @ 0x9ce9ef0] use an encoding preset (e.g. -vpre medium)
  
  [libx264 @ 0x9ce9ef0] preset usage: -vpre <speed> -vpre <profile>
  
  [libx264 @ 0x9ce9ef0] speed presets are listed in x264 --help
  
  [libx264 @ 0x9ce9ef0] profile is optional; x264 defaults to high
  
  Output #0, mp4, to 'path.mp4':
  
      Stream #0.0(eng): Video: libx264, yuv420p, 320x240, q=2-31, 200 kb/s, 90k tbn, 29.97 tbc
  
      Stream #0.1(eng): Audio: libfaac, 48000 Hz, 2 channels, s16, 192 kb/s
  
  Stream mapping:
  
    Stream #0.1 -> #0.0
  
    Stream #0.0 -> #0.1
  
  Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height
  
  </profile></speed>

  Thanks for any help

• Why does FFMPEG report the wrong duration ?

  27 avril 2013, par Adrian Lynch

  I have an oldish build of FFMPEG that I can't easily change.

  We use FFMPEG to find the duration of video and sound files. So far it has been working wonderfully.

  Recently on an uploaded file, FFMPEG has reported a 30 second file as being 5 minutes 30 seconds in length.

  Could it be something wrong with the file rather than FFMPEG ?

  If I use FFMPEG to convert to another file, the duration is restored.

  In case it matters, ffmpeg -i 'path to the file' produces :

      FFmpeg version Sherpya-r15618, Copyright (c) 2000-2008 Fabrice Bellard, et al.
        libavutil     49.11. 0 / 49.11. 0
        libavcodec    52. 0. 0 / 52. 0. 0
        libavformat   52.22. 1 / 52.22. 1
        libavdevice   52. 1. 0 / 52. 1. 0
        libswscale     0. 6. 1 /  0. 6. 1
        libpostproc   51. 2. 0 / 51. 2. 0
        built on Oct 14 2008 23:43:47, gcc : 4.2.5 20080919 (prerelease) [Sherpya]
      Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'H :\path\to\file.mov' :
        Duration : 00:05:35.00, start : 0.000000, bitrate : 1223 kb/s
          Stream #0.0(eng) : Audio : aac, 44100 Hz, stereo, s16
          Stream #0.1(eng) : Video : h264, yuv420p, 720x576, 25.00 tb(r)
      Must supply at least one output file
  

  It's that very command I use to then extract the duration with RegEx.

  Does anyone have a nice application that can do what I'm trying above but get it right 100% of the time ?

• What Every Programmer Should Know

  24 décembre 2012, par Multimedia Mike — General

  During my recent effort to force myself to understand Unicode and modern text encoding/processing, I was reminded that this is something that “every programmer should just know”, an idea that comes up every so often, usually in relation to a subject in which the speaker is already an expert. One of the most absurd examples I ever witnessed was a blog post along the lines of “What every working programmer ought to know about [some very specific niche of enterprise-level Java programming]“. I remember reading through the article and recognizing that I had almost no knowledge of the material. Disturbing, since I am demonstrably a “working programmer”.

  For fun, I queried the googles on the matter of what ever programmer ought to know.

  Specific Topics
  Here is what every programmer should know about : Unicode, time, memory (simple), memory (extremely in-depth), regular expressions, search engine optimization, floating point, security, basic number theory, race conditions, managed C++, VIM commands, distributed systems, object-oriented design, latency numbers, rate monotonic algorithm, merging branches in Mercurial, classes of algorithms, and human names.

  Broader Topics
  20 subjects every programmer should know, 97 things every programmer should know, 12 things every programmer should know, things every programmer should know (27 items), 10 papers every programmer should read at least twice, 10 things every programmer should know for their first job.

  Meanwhile, I remain fond of this xkcd comic whose mouseover text describes all that a person genuinely needs to know. Still, the new year is upon us, a time when people often make commitments to bettering themselves, and it couldn’t hurt (much) to at least skim some of the lists and find out what you never knew that you never knew.

  What About Multimedia ?
  Reading the foregoing (or the titles of the foregoing pieces), I naturally wonder if I should write something about what every programmer should know about multimedia. I think it would look something like a multimedia programming FAQ. These are some items that I can think of :

  1. YUV : The other colorspace (since most programmers are only familiar with RGB and have no idea what to make of the YUV that comes out of most video decoding APIs)
  2. Why you can’t easily seek randomly to any specific frame in a video file (keyframe/interframe discussion and their implications)
  3. Understand your platform before endeavoring to implement multimedia software (modern platforms, particularly mobile platforms, probably provide everything you need in the native APIs and there is likely little reason to compile libavcodec for the platform)
  4. Difference between containers and codecs (longstanding item, but I would argue it’s less relevant these days due to standardization on the MPEG — MP4/H.264/AAC — stack)
  5. What counts as a multimedia standard in this day and age (comparing the foregoing MPEG stack with the WebM/VP8/Vorbis stack)
  6. Trade-offs to consider when engineering a multimedia solution
  7. Optimization doesn’t always work the way you think it does (not everything touted as a massive speed-up in the world of computing — whether it be multithreaded CPUs, GPGPUs, new SIMD instruction sets — will necessarily be applicable to multimedia processing)
  8. A practical guide to legal issues would not be amiss
  9.  ???

  What other items count as “something multimedia-related that every programmer should know” ?