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• Corrupt playback of .flv when using JW Player

  21 mai 2012, par Adam Ingmansson

  This question is also asked on Audio-Video Production

  I have some files that when played in jwplayer the playback is corrupt.
  The files are encoded to h.264 using FFMpeg and there is other files encoded in the same way that works.

  At the moment we only use the flash version of the player.

  The corrupt playback looks like this :

  http://adam.ingmansson.com/public/jwplayer-corrupt-video.png

  This problem started showing up after we did an upgrade to FFMpeg, so I haven't ruled out that it could be an encoding error.

  the command used to run FFMpeg is :

  ffmpeg 
  
      -i /home/ftp/1c8f08b7d0d9e7fa4b24066156ad50bc981497a0.mov 
  
      -vcodec libx264 
  
      -preset ultrafast 
  
      -profile baseline 
  
      -acodec libfaac 
  
      -ab 96k 
  
      -crf 19 
  
      -vf movie="/home/adam/logo.png [watermark]; [in][watermark] overlay=main_w-overlay_w-10:main_h-overlay_h-10 [out]" 
  
      -y /home/ftp/1c8f08b7d0d9e7fa4b24066156ad50bc981497a0.flv

  I am in no way an expert in FFMpeg commandline, so feel free to point out any mistakes made.

  FFMpeg info :

  ffmpeg version git-2012-05-02-2330eb1 Copyright (c) 2000-2012 the FFmpeg developers
  
    built on May  3 2012 08:51:25 with gcc 4.4.3
  
    configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-version3 --enable-x11grab
  
    libavutil      51. 49.100 / 51. 49.100
  
    libavcodec     54. 17.101 / 54. 17.101
  
    libavformat    54.  3.100 / 54.  3.100
  
    libavdevice    53.  4.100 / 53.  4.100
  
    libavfilter     2. 72.103 /  2. 72.103
  
    libswscale      2.  1.100 /  2.  1.100
  
    libswresample   0. 11.100 /  0. 11.100
  
    libpostproc    52.  0.100 / 52.  0.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x24300e0] max_analyze_duration 5000000 reached at 5187000
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/ftp/javarecorder/1c8f08b7d0d9e7fa4b24066156ad50bc981497a0.mov':
  
    Metadata:
  
      major_brand     : qt
  
      minor_version   : 537199360
  
      compatible_brands: qt
  
      creation_time   : 2012-05-16 08:19:41
  
    Duration: 00:13:33.00, start: 0.000000, bitrate: 2164 kb/s
  
      Stream #0:0(eng): Video: qtrle (rle  / 0x20656C72), rgb24, 1366x768, 1457 kb/s, 8.43 fps, 1k tbr, 1k tbn, 1k tbc
  
      Metadata:
  
        creation_time   : 2012-05-16 08:19:41
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:1(eng): Audio: pcm_s16be (twos / 0x736F7774), 44100 Hz, 1 channels, s16, 705 kb/s
  
      Metadata:
  
        creation_time   : 2012-05-16 08:19:41
  
        handler_name    : Apple Alias Data Handler
  
  Please use -profile:a or -profile:v, -profile is ambiguous
  
  [buffer @ 0x2446ac0] w:1366 h:768 pixfmt:rgb24 tb:1/1000000 sar:0/1 sws_param:flags=2
  
  [movie @ 0x242f840] seek_point:0 format_name:(null) file_name:/home/adam/logo.png stream_index:0
  
  [overlay @ 0x2442840] auto-inserting filter 'auto-inserted scale 0' between the filter 'src' and the filter 'Parsed_overlay_1'
  
  [overlay @ 0x2442840] auto-inserting filter 'auto-inserted scale 1' between the filter 'Parsed_movie_0' and the filter 'Parsed_overlay_1'
  
  [scale @ 0x24444a0] w:1366 h:768 fmt:rgb24 sar:0/1 -> w:1366 h:768 fmt:yuv420p sar:0/1 flags:0x4
  
  [scale @ 0x2445100] w:80 h:80 fmt:rgba sar:1/1 -> w:80 h:80 fmt:yuva420p sar:1/1 flags:0x4
  
  [overlay @ 0x2442840] main w:1366 h:768 fmt:yuv420p overlay x:1276 y:678 w:80 h:80 fmt:yuva420p
  
  [overlay @ 0x2442840] main_tb:1/1000000 overlay_tb:1/25 -> tb:1/1000000 exact:1
  
  [libx264 @ 0x242d8c0] MB rate (4128000) > level limit (2073600)
  
  [libx264 @ 0x242d8c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
  
  [libx264 @ 0x242d8c0] profile Constrained Baseline, level 5.2
  
  [libx264 @ 0x242d8c0] 264 - core 124 r2197 69a0443 - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=36 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=0 intra_refresh=0 rc=crf mbtree=0 crf=19.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
  
  [libfaac @ 0x2443540] channel_layout not specified
  
  Guessed Channel Layout for  Input Stream #0.1 : mono
  
  Output #0, flv, to '/home/ftp/javarecorder/1c8f08b7d0d9e7fa4b24066156ad50bc981497a0.flv':
  
    Metadata:
  
      major_brand     : qt
  
      minor_version   : 537199360
  
      compatible_brands: qt
  
      creation_time   : 2012-05-16 08:19:41
  
      encoder         : Lavf54.3.100
  
      Stream #0:0(eng): Video: h264 ([7][0][0][0] / 0x0007), yuv420p, 1366x768, q=-1--1, 1k tbn, 1k tbc
  
      Metadata:
  
        creation_time   : 2012-05-16 08:19:41
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:1(eng): Audio: aac ([10][0][0][0] / 0x000A), 44100 Hz, mono, s16, 96 kb/s
  
      Metadata:
  
        creation_time   : 2012-05-16 08:19:41
  
        handler_name    : Apple Alias Data Handler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (qtrle -> libx264)
  
    Stream #0:1 -> #0:1 (pcm_s16be -> libfaac)
  
  Press [q] to stop, [?] for help
  
  Input stream #0:1 frame changed from rate:44100 fmt:s16 ch:1 chl:0x0 to rate:44100 fmt:s16 ch:1 chl:0x4
  
  frame= 6856 fps=105 q=-1.0 Lsize=   36030kB time=00:13:32.83 bitrate= 363.1kbits/s
  
  video:27775kB audio:7540kB global headers:0kB muxing overhead 2.026555%
  
  [libx264 @ 0x242d8c0] frame I:28    Avg QP: 4.61  size:238170
  
  [libx264 @ 0x242d8c0] frame P:6828  Avg QP: 7.31  size:  3189
  
  [libx264 @ 0x242d8c0] mb I  I16..4: 100.0%  0.0%  0.0%
  
  [libx264 @ 0x242d8c0] mb P  I16..4:  0.9%  0.0%  0.0%  P16..4:  2.2%  0.0%  0.0%  0.0%  0.0%    skip:96.9%
  
  [libx264 @ 0x242d8c0] coded y,uvDC,uvAC intra: 32.3% 30.0% 29.0% inter: 1.0% 1.1% 1.0%
  
  [libx264 @ 0x242d8c0] i16 v,h,dc,p: 66% 32%  1%  1%
  
  [libx264 @ 0x242d8c0] i8c dc,h,v,p: 62% 23% 14%  1%
  
  [libx264 @ 0x242d8c0] kb/s:279.82

  EDIT :

  A coworker was able to view a "corrupted" file. The only difference between my computer and his is that he have a Mac. Same flash version, same JW Player version. Something is not right here.

• 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” ?

• FFmpeg Build ERROR (/usr/bin/ln : failed to create symbolic link 'libavutil.so' : No such file or)

  11 février 2018, par BW-Eagle

  I’m not expert on building c-files.
  I want to use custom ffmpeg in my anndroid app.
  But I have the below problem when building ffmpeg package with MinGW and NDK-R14b

  After running bash command, after a while finally it reaches this error :

  /usr/bin/ln: failed to create symbolic link 'libavutil.so': No such file     or directory
  
  make: *** [libavutil/libavutil.so] Error 1
  
  make: *** Waiting for unfinished jobs....

  I know that the problem must be about to LINKER but I can’t fix it.

  Any help would be appreciated.