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• Revision d2059b0d2d : Skip mode check when mv has been tested This commit allows the non-RD mode deci

  7 mars 2014, par Jingning Han

  Changed Paths :
   Modify /vp9/encoder/vp9_pickmode.c

  
  
  Skip mode check when mv has been tested

  This commit allows the non-RD mode decision to skip mode RD modelling
  check, if the motion vector associated with the current mode is
  same as that of NEARESTMV mode. This makes speed -7 about 2% faster.
  Previous change that converts cost metric from SAD to model based RD
  value makes the codec 6% slower at speed -7.

  Change-Id : I30cfec5452f606a671b8432a2f7f0c94fbb49fc8

• Reverse Engineering Italian Literature

  1er juillet 2014, par Multimedia Mike — Reverse Engineering

  Some time ago, Diego “Flameeyes” Pettenò tried his hand at reverse engineering a set of really old CD-ROMs containing even older Italian literature. The goal of this RE endeavor would be to extract the useful literature along with any structural metadata (chapters, etc.) and convert it to a more open format suitable for publication at, e.g., Project Gutenberg or Archive.org.

  Unfortunately, the structure of the data thwarted the more simplistic analysis attempts (like inspecting for blocks of textual data). This will require deeper RE techniques. Further frustrating the effort, however, is the fact that the binaries that implement the reading program are written for the now-archaic Windows 3.1 operating system.

  In pursuit of this RE goal, I recently thought of a way to glean more intelligence using DOSBox.

  Prior Work
  There are 6 discs in the full set (distributed along with 6 sequential issues of a print magazine named L’Espresso). Analysis of the contents of the various discs reveals that many of the files are the same on each disc. It was straightforward to identify the set of files which are unique on each disc. This set of files all end with the extension “LZn”, where n = 1..6 depending on the disc number. Further, the root directory of each disc has a file indicating the sequence number (1..6) of the CD. Obviously, these are the interesting targets.

  The LZ file extensions stand out to an individual skilled in the art of compression– could it be a variation of the venerable LZ compression ? That’s actually unlikely because LZ — also seen as LIZ — stands for Letteratura Italiana Zanichelli (Zanichelli’s Italian Literature).

  The Unix ‘file’ command was of limited utility, unable to plausibly identify any of the files.

  Progress was stalled.

  Saying Hello To An Old Frenemy
  I have been showing this screenshot to younger coworkers to see if any of them recognize it :

  
  
  

  Not a single one has seen it before. Senior computer citizen status : Confirmed.

  I recently watched an Ancient DOS Games video about Windows 3.1 games. This episode showed Windows 3.1 running under DOSBox. I had heard this was possible but that it took a little work to get running. I had a hunch that someone else had probably already done the hard stuff so I took to the BitTorrent networks and quickly found a download that had the goods ready to go– a directory of Windows 3.1 files that just had to be dropped into a DOSBox directory and they would be ready to run.

  Aside : Running OS software procured from a BitTorrent network ? Isn’t that an insane security nightmare ? I’m not too worried since it effectively runs under a sandboxed virtual machine, courtesy of DOSBox. I suppose there’s the risk of trojan’d OS software infecting binaries that eventually leave the sandbox.

  Using DOSBox Like ‘strace’
  strace is a tool available on some Unix systems, including Linux, which is able to monitor the system calls that a program makes. In reverse engineering contexts, it can be useful to monitor an opaque, binary program to see the names of the files it opens and how many bytes it reads, and from which locations. I have written examples of this before (wow, almost 10 years ago to the day ; now I feel old for the second time in this post).

  Here’s the pitch : Make DOSBox perform as strace in order to serve as a platform for reverse engineering Windows 3.1 applications. I formed a mental model about how DOSBox operates — abstracted file system classes with methods for opening and reading files — and then jumped into the source code. Sure enough, the code was exactly as I suspected and a few strategic print statements gave me the data I was looking for.

  Eventually, I even took to running DOSBox under the GNU Debugger (GDB). This hasn’t proven especially useful yet, but it has led to an absurd level of nesting :

  
  
  

  The target application runs under Windows 3.1, which is running under DOSBox, which is running under GDB. This led to a crazy situation in which DOSBox had the mouse focus when a GDB breakpoint was triggered. At this point, DOSBox had all desktop input focus and couldn’t surrender it because it wasn’t running. I had no way to interact with the Linux desktop and had to reboot the computer. The next time, I took care to only use the keyboard to navigate the application and trigger the breakpoint and not allow DOSBox to consume the mouse focus.

  New Intelligence
  
  By instrumenting the local file class (virtual HD files) and the ISO file class (CD-ROM files), I was able to watch which programs and dynamic libraries are loaded and which data files the code cares about. I was able to narrow down the fact that the most interesting programs are called LEGGENDO.EXE (‘reading’) and LEGGENDA.EXE (‘legend’ ; this has been a great Italian lesson as well as RE puzzle). The first calls the latter, which displays this view of the data we are trying to get at :

  
  
  

  When first run, the program takes an interest in a file called DBBIBLIO (‘database library’, I suspect) :

  === Read(’LIZ98\DBBIBLIO.LZ1’) : req 337 bytes ; read 337 bytes from pos 0x0
  === Read(’LIZ98\DBBIBLIO.LZ1’) : req 337 bytes ; read 337 bytes from pos 0x151
  === Read(’LIZ98\DBBIBLIO.LZ1’) : req 337 bytes ; read 337 bytes from pos 0x2A2
  [...]
  

  While we were unable to sort out all of the data files in our cursory investigation, a few things were obvious. The structure of this file looked to contain 336-byte records. Turns out I was off by 1– the records are actually 337 bytes each. The count of records read from disc is equal to the number of items shown in the UI.

  Next, the program is interested in a few more files :

  *** isoFile() : ’DEPOSITO\BLOKCTC.LZ1’, offset 0x27D6000, 2911488 bytes large
  === Read(’DEPOSITO\BLOKCTC.LZ1’) : req 96 bytes ; read 96 bytes from pos 0x0
  *** isoFile() : ’DEPOSITO\BLOKCTX0.LZ1’, offset 0x2A9D000, 17152 bytes large
  === Read(’DEPOSITO\BLOKCTX0.LZ1’) : req 128 bytes ; read 128 bytes from pos 0x0
  === Seek(’DEPOSITO\BLOKCTX0.LZ1’) : seek 384 (0x180) bytes, type 0
  === Read(’DEPOSITO\BLOKCTX0.LZ1’) : req 256 bytes ; read 256 bytes from pos 0x180
  === Seek(’DEPOSITO\BLOKCTC.LZ1’) : seek 1152 (0x480) bytes, type 0
  === Read(’DEPOSITO\BLOKCTC.LZ1’) : req 32 bytes ; read 32 bytes from pos 0x480
  === Read(’DEPOSITO\BLOKCTC.LZ1’) : req 1504 bytes ; read 1504 bytes from pos 0x4A0
  [...]

  Eventually, it becomes obvious that BLOKCTC has the juicy meat. There are 32-byte records followed by variable-length encoded text sections. Since there is no text to be found in these files, the text is either compressed, encrypted, or both. Some rough counting (the program seems to disable copy/paste, which thwarts more precise counting), indicates that the text size is larger than the data chunks being read from disc, so compression seems likely. Encryption isn’t out of the question (especially since the program deems it necessary to disable copy and pasting of this public domain literary data), and if it’s in use, that means the key is being read from one of these files.

  Blocked On Disassembly
  So I’m a bit blocked right now. I know exactly where the data lives, but it’s clear that I need to reverse engineer some binary code. The big problem is that I have no idea how to disassemble Windows 3.1 binaries. These are NE-type executable files. Disassemblers abound for MZ files (MS-DOS executables) and PE files (executables for Windows 95 and beyond). NE files get no respect. It’s difficult (but not impossible) to even find data about the format anymore, and details are incomplete. It should be noted, however, the DOSBox-as-strace method described here lends insight into how Windows 3.1 processes NE-type EXEs. You can’t get any more authoritative than that.

  So far, I have tried the freeware version of IDA Pro. Unfortunately, I haven’t been able to get the program to work on my Windows machine for a long time. Even if I could, I can’t find any evidence that it actually supports NE files (the free version specifically mentions MZ and PE, but does not mention NE or LE).

  I found an old copy of Borland’s beloved Turbo Assembler and Debugger package. It has Turbo Debugger for Windows, both regular and 32-bit versions. Unfortunately, the normal version just hangs Windows 3.1 in DOSBox. The 32-bit Turbo Debugger loads just fine but can’t load the NE file.

  I’ve also wondered if DOSBox contains any advanced features for trapping program execution and disassembling. I haven’t looked too deeply into this yet.

  Future Work
  NE files seem to be the executable format that time forgot. I have a crazy brainstorm about repacking NE files as MZ executables so that they could be taken apart with an MZ disassembler. But this will take some experimenting.

  If anyone else has any ideas about ripping open these binaries, I would appreciate hearing them.

  And I guess I shouldn’t be too surprised to learn that all the literature in this corpus is already freely available and easily downloadable anyway. But you shouldn’t be too surprised if that doesn’t discourage me from trying to crack the format that’s keeping this particular copy of the data locked up.

• ffmpeg error when using non root user

  29 août 2014, par mkern

  I have installed ffmpeg and it works perfect if you are root or using sudo but it errors out when trying to use it as a non-root user. I have performed the same install on a test VPS and it installs without issue so it appears to be isolated to this cPanel server. I haven’t been able to identify why.

  Non-Root :

  > ffmpeg -v debug -i 1.mov 1.avi ffmpeg version N-65949-g0ddb051
  
  > Copyright (c) 2000-2014 the FFmpeg developers   built on Aug 28 2014
  
  > 11:39:47 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-4)  
  
  > configuration: --enable-gpl --enable-libmp3lame --enable-libvorbis
  
  > --enable-libvpx --enable-libx264   libavutil      54.  7.100 / 54.  7.100   libavcodec     56.  0.101 / 56.  0.101   libavformat    56.  3.100 / 56.  3.100   libavdevice    56.  0.100 / 56.  0.100   libavfilter     5.  0.103 /  5.  0.103   libswscale      3.  0.100 / 
  
  > 3.  0.100   libswresample   1.  1.100 /  1.  1.100   libpostproc    53.  0.100 / 53.  0.100 Splitting the commandline. Reading option '-v' ... matched as option 'v' (set logging level) with argument 'debug'.
  
  > Reading option '-i' ... matched as input file with argument '1.mov'.
  
  > Reading option '1.avi' ... matched as output file. Finished splitting
  
  > the commandline. Parsing a group of options: global . Applying option
  
  > v (set logging level) with argument debug. Successfully parsed a group
  
  > of options. Parsing a group of options: input file 1.mov. Successfully
  
  > parsed a group of options. Opening an input file: 1.mov.
  
  > [mov,mp4,m4a,3gp,3g2,mj2 @ 0x348fc20] Format mov,mp4,m4a,3gp,3g2,mj2
  
  > probed with size=2048 and score=100 [mov,mp4,m4a,3gp,3g2,mj2 @
  
  > 0x348fc20] ISO: File Type Major Brand: qt   [mov,mp4,m4a,3gp,3g2,mj2 @
  
  > 0x348fc20] Before avformat_find_stream_info() pos: 698348 bytes
  
  > read:39602 seeks:1 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x348fc20] All info
  
  > found [mov,mp4,m4a,3gp,3g2,mj2 @ 0x348fc20] After
  
  > avformat_find_stream_info() pos: 169190 bytes read:2333362 seeks:67
  
  > frames:148 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1.mov':  
  
  > Metadata:
  
  >     major_brand     : qt  
  
  >     minor_version   : 0
  
  >     compatible_brands: qt  
  
  >     creation_time   : 2014-06-05 04:40:27
  
  >     model           : iPhone 5
  
  >     model-eng       : iPhone 5
  
  >     encoder         : 7.1.1
  
  >     encoder-eng     : 7.1.1
  
  >     date            : 2014-06-04T21:40:27-0700
  
  >     date-eng        : 2014-06-04T21:40:27-0700
  
  >     make            : Apple
  
  >     make-eng        : Apple   Duration: 00:00:07.15, start: 0.000023, bitrate: 781 kb/s
  
  >     Stream #0:0(und), 41, 1/600: Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte170m), 480x360, 1/1200, 710 kb/s, 29.09
  
  > fps, 600 tbr, 600 tbn, 1200 tbc (default)
  
  >     Metadata:
  
  >       rotate          : 90
  
  >       creation_time   : 2014-06-05 04:40:27
  
  >       handler_name    : Core Media Data Handler
  
  >       encoder         : H.264
  
  >     Side data:
  
  >       displaymatrix: rotation of -90.00 degrees
  
  >     Stream #0:1(und), 107, 1/44100: Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 63 kb/s (default)
  
  >     Metadata:
  
  >       creation_time   : 2014-06-05 04:40:27
  
  >       handler_name    : Core Media Data Handler Successfully opened the file. Parsing a group of options: output file 1.avi. Successfully
  
  > parsed a group of options. Opening an output file: 1.avi. Successfully
  
  > opened the file. detected 24 logical cores [graph 0 input from stream
  
  > 0:0 @ 0x34aa3a0] Setting 'video_size' to value '480x360' [graph 0
  
  > input from stream 0:0 @ 0x34aa3a0] Setting 'pix_fmt' to value '0'
  
  > [graph 0 input from stream 0:0 @ 0x34aa3a0] Setting 'time_base' to
  
  > value '1/600' [graph 0 input from stream 0:0 @ 0x34aa3a0] Setting
  
  > 'pixel_aspect' to value '0/1' [graph 0 input from stream 0:0 @
  
  > 0x34aa3a0] Setting 'sws_param' to value 'flags=2' [graph 0 input from
  
  > stream 0:0 @ 0x34aa3a0] Setting 'frame_rate' to value '320/11' [graph
  
  > 0 input from stream 0:0 @ 0x34aa3a0] w:480 h:360 pixfmt:yuv420p
  
  > tb:1/600 fr:320/11 sar:0/1 sws_param:flags=2 [format @ 0x3496b00]
  
  > compat: called with args=[yuv420p] [format @ 0x3496b00] Setting
  
  > 'pix_fmts' to value 'yuv420p' [AVFilterGraph @ 0x348f320]
  
  > query_formats: 4 queried, 3 merged, 0 already done, 0 delayed
  
  > [AVFilterGraph @ 0x34bbe60] Error initializing threading.
  
  > [AVFilterGraph @ 0x34bbe60] Error creating filter 'anull' Error
  
  > opening filters! [AVIOContext @ 0x34967c0] Statistics: 0 seeks, 0
  
  > writeouts [AVIOContext @ 0x348f1e0] Statistics: 2333362 bytes read, 67
  
  > seeks

  [AVFilterGraph @ 0x34bbe60] Error initializing threading.
  [AVFilterGraph @ 0x34bbe60] Error creating filter ’anull’ Error
  opening filters !
  

  As ROOT :

  ffmpeg -v verbose -i 1.mov 1.avi
  
  ffmpeg version N-65949-g0ddb051 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Aug 28 2014 11:39:47 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-4)
  
    configuration: --enable-gpl --enable-libmp3lame --enable-libvorbis --enable-libvpx --enable-libx264
  
    libavutil      54.  7.100 / 54.  7.100
  
    libavcodec     56.  0.101 / 56.  0.101
  
    libavformat    56.  3.100 / 56.  3.100
  
    libavdevice    56.  0.100 / 56.  0.100
  
    libavfilter     5.  0.103 /  5.  0.103
  
    libswscale      3.  0.100 /  3.  0.100
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  0.100 / 53.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 0
  
      compatible_brands: qt  
  
      creation_time   : 2014-06-05 04:40:27
  
      model           : iPhone 5
  
      model-eng       : iPhone 5
  
      encoder         : 7.1.1
  
      encoder-eng     : 7.1.1
  
      date            : 2014-06-04T21:40:27-0700
  
      date-eng        : 2014-06-04T21:40:27-0700
  
      make            : Apple
  
      make-eng        : Apple
  
    Duration: 00:00:07.15, start: 0.000023, bitrate: 781 kb/s
  
      Stream #0:0(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte170m), 480x360, 710 kb/s, 29.09 fps, 600 tbr, 600 tbn, 1200 tbc (default)
  
      Metadata:
  
        rotate          : 90
  
        creation_time   : 2014-06-05 04:40:27
  
        handler_name    : Core Media Data Handler
  
        encoder         : H.264
  
      Side data:
  
        displaymatrix: rotation of -90.00 degrees
  
      Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 63 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-06-05 04:40:27
  
        handler_name    : Core Media Data Handler
  
  [graph 0 input from stream 0:0 @ 0x27ed3a0] w:480 h:360 pixfmt:yuv420p tb:1/600 fr:320/11 sar:0/1 sws_param:flags=2
  
  [graph 1 input from stream 0:1 @ 0x2800700] tb:1/44100 samplefmt:fltp samplerate:44100 chlayout:0x4
  
  Output #0, avi, to '1.avi':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 0
  
      compatible_brands: qt  
  
      make-eng        : Apple
  
      model           : iPhone 5
  
      model-eng       : iPhone 5
  
      make            : Apple
  
      ISFT            : Lavf56.3.100
  
      ICRD            : 2014-06-04T21:40:27-0700
  
      date-eng        : 2014-06-04T21:40:27-0700
  
      Stream #0:0(und): Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 480x360, q=2-31, 200 kb/s, 29.09 fps, 29.09 tbn, 29.09 tbc (default)
  
      Metadata:
  
        rotate          : 90
  
        creation_time   : 2014-06-05 04:40:27
  
        handler_name    : Core Media Data Handler
  
        encoder         : Lavc56.0.101 mpeg4
  
      Stream #0:1(und): Audio: mp3 (libmp3lame) (U[0][0][0] / 0x0055), 44100 Hz, mono, fltp (default)
  
      Metadata:
  
        creation_time   : 2014-06-05 04:40:27
  
        handler_name    : Core Media Data Handler
  
        encoder         : Lavc56.0.101 libmp3lame
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> mpeg4 (native))
  
    Stream #0:1 -> #0:1 (aac (native) -> mp3 (libmp3lame))
  
  Press [q] to stop, [?] for help
  
  *** dropping frame 79 from stream 0 at ts 80
  
  *** dropping frame 113 from stream 0 at ts 114
  
  *** dropping frame 145 from stream 0 at ts 146
  
  *** dropping frame 177 from stream 0 at ts 178
  
  No more output streams to write to, finishing.
  
  frame=  204 fps=0.0 q=27.2 Lsize=     348kB time=00:00:07.15 bitrate= 398.4kbits/s dup=0 drop=4    
  
  video:271kB audio:56kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 6.560985%
  
  Input file #0 (1.mov):
  
    Input stream #0:0 (video): 208 packets read (634624 bytes); 208 frames decoded; 
  
    Input stream #0:1 (audio): 308 packets read (56854 bytes); 308 frames decoded (315392 samples); 
  
    Total: 516 packets (691478 bytes) demuxed
  
  Output file #0 (1.avi):
  
    Output stream #0:0 (video): 204 frames encoded; 204 packets muxed (276993 bytes); 
  
    Output stream #0:1 (audio): 274 frames encoded (315392 samples); 275 packets muxed (57469 bytes); 
  
    Total: 479 packets (334462 bytes) muxed

  strace and strace -e outputs :
  strace non root :
  

   579 clone(child_stack=0x7fd3bfd07ff0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|        CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7fd3bfd089d0, tls=0x7fd3bfd08700, child_tidptr=0x7fd3bfd089d0) = 3        2637
  
      580 mmap(NULL, 8392704, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7fd3bed07000
  
      581 mprotect(0x7fd3bed07000, 4096, PROT_NONE) = 0
  
      582 clone(child_stack=0x7fd3bf506ff0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|        CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7fd3bf5079d0, tls=0x7fd3bf507700, child_tidptr=0x7fd3bf5079d0) = -        1 EAGAIN (Resource temporarily unavailable)
  
      583 futex(0x253b420, FUTEX_WAKE_PRIVATE, 1) = 1
  
      584 futex(0x253b3f4, FUTEX_CMP_REQUEUE_PRIVATE, 1, 2147483647, 0x253b420, 4) = 2
  
      585 futex(0x253b420, FUTEX_WAKE_PRIVATE, 1) = 1
  
      586 futex(0x7fd3c2d0e9d0, FUTEX_WAIT, 32631, NULL) = 0
  
      587 munmap(0x7fd3bed07000, 8392704)         = 0
  
      588 munmap(0x7fd3c250e000, 8392704)         = 0
  
      589 munmap(0x7fd3c1d0d000, 8392704)         = 0
  
      590 munmap(0x7fd3c150c000, 8392704)         = 0
  
      591 write(2, "\33[1;32m[AVFilterGraph @ 0x253b0a"..., 39[AVFilterGraph @ 0x253b0a0] ) = 39
  
      592 write(2, "\33[1;31mError initializing thread"..., 41Error initializing threading.
  
      593 ) = 41
  
      594 write(2, "\33[1;32m[AVFilterGraph @ 0x253b0a"..., 39[AVFilterGraph @ 0x253b0a0] ) = 39
  
      595 write(2, "\33[1;31mError creating filter 'an"..., 41Error creating filter 'anull'
  
      596 ) = 41
  
      597 write(2, "\33[4;31mError opening filters!\n\33["..., 34Error opening filters!
  
      598 ) = 34

  strace -e non root :

  strace -e open ffmpeg -i 1.mov 5.avi
  
  open("/etc/ld.so.cache", O_RDONLY)      = 3
  
  open("/lib64/libasound.so.2", O_RDONLY) = 3
  
  open("/usr/lib64/libSDL-1.2.so.0", O_RDONLY) = 3
  
  open("/lib64/libpthread.so.0", O_RDONLY) = 3
  
  open("/usr/lib64/libx264.so.142", O_RDONLY) = 3
  
  open("/usr/lib64/libvpx.so.0", O_RDONLY) = 3
  
  open("/usr/local/lib/libvorbisenc.so.2", O_RDONLY) = 3
  
  open("/usr/local/lib/libvorbis.so.0", O_RDONLY) = 3
  
  open("/usr/local/lib/libmp3lame.so.0", O_RDONLY) = 3
  
  open("/lib64/libm.so.6", O_RDONLY)      = 3
  
  open("/lib64/libbz2.so.1", O_RDONLY)    = 3
  
  open("/usr/local/lib/libz.so.1", O_RDONLY) = 3
  
  open("/lib64/librt.so.1", O_RDONLY)     = 3
  
  open("/lib64/libc.so.6", O_RDONLY)      = 3
  
  open("/lib64/libdl.so.2", O_RDONLY)     = 3
  
  open("/usr/local/lib/libogg.so.0", O_RDONLY) = 3
  
  ffmpeg version N-65949-g0ddb051 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Aug 28 2014 11:39:47 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-4)
  
    configuration: --enable-gpl --enable-libmp3lame --enable-libvorbis --enable-libvpx --enable-libx264
  
    libavutil      54.  7.100 / 54.  7.100
  
    libavcodec     56.  0.101 / 56.  0.101
  
    libavformat    56.  3.100 / 56.  3.100
  
    libavdevice    56.  0.100 / 56.  0.100
  
    libavfilter     5.  0.103 /  5.  0.103
  
    libswscale      3.  0.100 /  3.  0.100
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  0.100 / 53.  0.100
  
  open("1.mov", O_RDONLY|O_CLOEXEC)       = 3
  
  open("/etc/localtime", O_RDONLY)        = 4
  
  open("/proc/meminfo", O_RDONLY|O_CLOEXEC) = 4
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 0
  
      compatible_brands: qt  
  
      creation_time   : 2014-06-05 04:40:27
  
      model           : iPhone 5
  
      model-eng       : iPhone 5
  
      encoder         : 7.1.1
  
      encoder-eng     : 7.1.1
  
      date            : 2014-06-04T21:40:27-0700
  
      date-eng        : 2014-06-04T21:40:27-0700
  
      make            : Apple
  
      make-eng        : Apple
  
    Duration: 00:00:07.15, start: 0.000023, bitrate: 781 kb/s
  
      Stream #0:0(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte170m), 480x360, 710 kb/s, 29.09 fps, 600 tbr, 600 tbn, 1200 tbc (default)
  
      Metadata:
  
        rotate          : 90
  
        creation_time   : 2014-06-05 04:40:27
  
        handler_name    : Core Media Data Handler
  
        encoder         : H.264
  
      Side data:
  
        displaymatrix: rotation of -90.00 degrees
  
      Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 63 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-06-05 04:40:27
  
        handler_name    : Core Media Data Handler
  
  open("5.avi", O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC, 0666) = 4
  
  [AVFilterGraph @ 0x26ff4a0] Error initializing threading.
  
  [AVFilterGraph @ 0x26ff4a0] Error creating filter 'anull'
  
  Error opening filters!

  strace root :

   579 clone(child_stack=0x7f4eb7c34ff0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|        CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7f4eb7c359d0, tls=0x7f4eb7c35700, child_tidptr=0x7f4eb7c359d0) = 3        383
  
      580 mmap(NULL, 8392704, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f4eb6c34000
  
      581 mprotect(0x7f4eb6c34000, 4096, PROT_NONE) = 0
  
      582 clone(child_stack=0x7f4eb7433ff0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|        CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7f4eb74349d0, tls=0x7f4eb7434700, child_tidptr=0x7f4eb74349d0) = 3        384
  
      583 mmap(NULL, 8392704, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f4eb6433000
  
      584 mprotect(0x7f4eb6433000, 4096, PROT_NONE) = 0
  
      585 clone(child_stack=0x7f4eb6c32ff0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|        CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7f4eb6c339d0, tls=0x7f4eb6c33700, child_tidptr=0x7f4eb6c339d0) = 3        385
  
      586 mmap(NULL, 8392704, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f4eb5c32000
  
      587 mprotect(0x7f4eb5c32000, 4096, PROT_NONE) = 0
  
      588 clone(child_stack=0x7f4eb6431ff0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|        CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7f4eb64329d0, tls=0x7f4eb6432700, child_tidptr=0x7f4eb64329d0) = 3        386
  
      589 mmap(NULL, 8392704, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f4eb5431000
  
      590 mprotect(0x7f4eb5431000, 4096, PROT_NONE) = 0
  
      591 clone(child_stack=0x7f4eb5c30ff0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|        CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7f4eb5c319d0, tls=0x7f4eb5c31700, child_tidptr=0x7f4eb5c319d0) = 3        387
  
      592 mmap(NULL, 8392704, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f4eb4c30000
  
      593 mprotect(0x7f4eb4c30000, 4096, PROT_NONE) = 0
  
      594 clone(child_stack=0x7f4eb542fff0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|        CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7f4eb54309d0, tls=0x7f4eb5430700, child_tidptr=0x7f4eb54309d0) = 3        388
  
      595 mmap(NULL, 8392704, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f4eb442f000
  
      596 mprotect(0x7f4eb442f000, 4096, PROT_NONE) = 0
  
      597 clone(child_stack=0x7f4eb4c2eff0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|        CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7f4eb4c2f9d0, tls=0x7f4eb4c2f700, child_tidptr=0x7f4eb4c2f9d0) = 3        389
  
      598 mmap(NULL, 8392704, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f4eb3c2e000

  strace -e root :

      strace -e open ffmpeg -i 1.mov 5.avi
  
      open("/etc/ld.so.cache", O_RDONLY)      = 3
  
      open("/lib64/libasound.so.2", O_RDONLY) = 3
  
      open("/usr/lib64/libSDL-1.2.so.0", O_RDONLY) = 3
  
      open("/lib64/libpthread.so.0", O_RDONLY) = 3
  
      open("/usr/lib64/libx264.so.142", O_RDONLY) = 3
  
      open("/usr/lib64/libvpx.so.0", O_RDONLY) = 3
  
      open("/usr/local/lib/libvorbisenc.so.2", O_RDONLY) = 3
  
      open("/usr/local/lib/libvorbis.so.0", O_RDONLY) = 3
  
      open("/usr/local/lib/libmp3lame.so.0", O_RDONLY) = 3
  
      open("/lib64/libm.so.6", O_RDONLY)      = 3
  
      open("/lib64/libbz2.so.1", O_RDONLY)    = 3
  
      open("/usr/local/lib/libz.so.1", O_RDONLY) = 3
  
      open("/lib64/librt.so.1", O_RDONLY)     = 3
  
      open("/lib64/libc.so.6", O_RDONLY)      = 3
  
      open("/lib64/libdl.so.2", O_RDONLY)     = 3
  
      open("/usr/local/lib/libogg.so.0", O_RDONLY) = 3
  
      ffmpeg version N-65957-gc6a3b00 Copyright (c) 2000-2014 the FFmpeg developers
  
        built on Aug 28 2014 13:37:32 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-4)
  
        configuration: --enable-gpl --enable-libmp3lame --enable-libvorbis --enable-libvpx --enable-libx264 --prefix=/usr --libdir=/usr/lib64 --enable-gpl --enable-libmp3lame --enable-libvorbis --enable-libvpx --enable-libx264
  
        libavutil      54.  7.100 / 54.  7.100
  
        libavcodec     56.  0.101 / 56.  0.101
  
        libavformat    56.  3.100 / 56.  3.100
  
        libavdevice    56.  0.100 / 56.  0.100
  
        libavfilter     5.  0.103 /  5.  0.103
  
        libswscale      3.  0.100 /  3.  0.100
  
        libswresample   1.  1.100 /  1.  1.100
  
        libpostproc    53.  0.100 / 53.  0.100
  
      open("1.mov", O_RDONLY|O_CLOEXEC)       = 3
  
      open("/etc/localtime", O_RDONLY)        = 4
  
      open("/proc/meminfo", O_RDONLY|O_CLOEXEC) = 4
  
      Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1.mov':
  
        Metadata:
  
          major_brand     : qt  
  
          minor_version   : 0
  
          compatible_brands: qt  
  
          creation_time   : 2014-06-05 04:40:27
  
          model           : iPhone 5
  
          model-eng       : iPhone 5
  
          encoder         : 7.1.1
  
          encoder-eng     : 7.1.1
  
          date            : 2014-06-04T21:40:27-0700
  
          date-eng        : 2014-06-04T21:40:27-0700
  
          make            : Apple
  
          make-eng        : Apple
  
        Duration: 00:00:07.15, start: 0.000023, bitrate: 781 kb/s
  
          Stream #0:0(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte170m), 480x360, 710 kb/s, 29.09 fps, 600 tbr, 600 tbn, 1200 tbc (default)
  
          Metadata:
  
            rotate          : 90
  
            creation_time   : 2014-06-05 04:40:27
  
            handler_name    : Core Media Data Handler
  
            encoder         : H.264
  
          Side data:
  
            displaymatrix: rotation of -90.00 degrees
  
          Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 63 kb/s (default)
  
          Metadata:
  
            creation_time   : 2014-06-05 04:40:27
  
            handler_name    : Core Media Data Handler
  
      File '5.avi' already exists. Overwrite ? [y/N] y
  
      open("5.avi", O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC, 0666) = 4
  
      Output #0, avi, to '5.avi':
  
        Metadata:
  
          major_brand     : qt  
  
          minor_version   : 0
  
          compatible_brands: qt  
  
          make-eng        : Apple
  
          model           : iPhone 5
  
          model-eng       : iPhone 5
  
          make            : Apple
  
          ISFT            : Lavf56.3.100
  
          ICRD            : 2014-06-04T21:40:27-0700
  
          date-eng        : 2014-06-04T21:40:27-0700
  
          Stream #0:0(und): Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 480x360, q=2-31, 200 kb/s, 29.09 fps, 29.09 tbn, 29.09 tbc (default)
  
          Metadata:
  
            rotate          : 90
  
            creation_time   : 2014-06-05 04:40:27
  
            handler_name    : Core Media Data Handler
  
            encoder         : Lavc56.0.101 mpeg4
  
          Stream #0:1(und): Audio: mp3 (libmp3lame) (U[0][0][0] / 0x0055), 44100 Hz, mono, fltp (default)
  
          Metadata:
  
            creation_time   : 2014-06-05 04:40:27
  
            handler_name    : Core Media Data Handler
  
            encoder         : Lavc56.0.101 libmp3lame
  
      Stream mapping:
  
        Stream #0:0 -> #0:0 (h264 (native) -> mpeg4 (native))
  
        Stream #0:1 -> #0:1 (aac (native) -> mp3 (libmp3lame))
  
      Press [q] to stop, [?] for help
  
      frame=  204 fps=0.0 q=27.2 Lsize=     348kB time=00:00:07.15 bitrate= 398.4kbits/s dup=0 drop=4    
  
      video:271kB audio:56kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 6.560985%