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• libavcodec : ffprobe on file encoded with FFV1 codec reports "read_quant_table error"

  20 novembre 2016, par Ali Alidoust

  I’m using the following code to encode a series of frames into an mkv or avi file with FFV1 encoding :

     HRESULT Session::createContext(LPCSTR filename, UINT width, UINT height, UINT fps_num, UINT fps_den) {
  
      LOG("Exporting to file: ", filename);
  
  
  
      AVCodecID codecId = AV_CODEC_ID_FFV1;
  
      this->pixelFormat = AV_PIX_FMT_YUV420P;
  
  
  
      this->codec = avcodec_find_encoder(codecId);
  
      RET_IF_NULL(this->codec, "Could not create codec", E_FAIL);
  
  
  
      this->oformat = av_guess_format(NULL, filename, NULL);
  
      RET_IF_NULL(this->oformat, "Could not create format", E_FAIL);
  
      this->oformat->video_codec = codecId;
  
      this->width = width;
  
      this->height = height;
  
      this->codecContext = avcodec_alloc_context3(this->codec);
  
      RET_IF_NULL(this->codecContext, "Could not allocate context for the codec", E_FAIL);
  
  
  
      this->codecContext->codec = this->codec;
  
      this->codecContext->codec_id = codecId;
  
  
  
      this->codecContext->pix_fmt = pixelFormat;
  
      this->codecContext->width = this->width;
  
      this->codecContext->height = this->height;
  
      this->codecContext->time_base.num = fps_den;
  
      this->codecContext->time_base.den = fps_num;
  
  
  
      this->codecContext->gop_size = 1;
  
  
  
  
  
      RET_IF_FAILED_AV(avformat_alloc_output_context2(&fmtContext, this->oformat, NULL, NULL), "Could not allocate format context", E_FAIL);
  
      RET_IF_NULL(this->fmtContext, "Could not allocate format context", E_FAIL);
  
  
  
      this->fmtContext->oformat = this->oformat;
  
      this->fmtContext->video_codec_id = codecId;
  
  
  
      this->stream = avformat_new_stream(this->fmtContext, this->codec);
  
      RET_IF_NULL(this->stream, "Could not create new stream", E_FAIL);
  
      this->stream->time_base = this->codecContext->time_base;
  
      RET_IF_FAILED_AV(avcodec_parameters_from_context(this->stream->codecpar, this->codecContext), "Could not convert AVCodecContext to AVParameters", E_FAIL);
  
  
  
      if (this->fmtContext->oformat->flags & AVFMT_GLOBALHEADER)
  
      {
  
          this->codecContext->flags |= CODEC_FLAG_GLOBAL_HEADER;
  
      }
  
  
  
      av_opt_set_int(this->codecContext->priv_data, "coder", 0, 0);
  
      av_opt_set_int(this->codecContext->priv_data, "context", 1, 0);
  
      av_opt_set_int(this->codecContext->priv_data, "slicecrc", 1, 0);
  
      //av_opt_set_int(this->codecContext->priv_data, "slicecrc", 1, 0);
  
      //av_opt_set_int(this->codecContext->priv_data, "pix_fmt", pixelFormat, 0);
  
  
  
      RET_IF_FAILED_AV(avcodec_open2(this->codecContext, this->codec, NULL), "Could not open codec", E_FAIL);
  
      RET_IF_FAILED_AV(avio_open(&this->fmtContext->pb, filename, AVIO_FLAG_WRITE), "Could not open output file", E_FAIL);
  
      RET_IF_NULL(this->fmtContext->pb, "Could not open output file", E_FAIL);
  
      RET_IF_FAILED_AV(avformat_write_header(this->fmtContext, NULL), "Could not write header", E_FAIL);
  
  
  
      frame = av_frame_alloc();
  
      RET_IF_NULL(frame, "Could not allocate frame", E_FAIL);
  
      frame->format = this->codecContext->pix_fmt;
  
      frame->width = width;
  
      frame->height = height;
  
      return S_OK;
  
  }
  
  
  
  HRESULT Session::writeFrame(IMFSample * pSample) {
  
      IMFMediaBuffer *mediaBuffer = NULL;
  
      BYTE *pDataNV12 = NULL;
  
      DWORD length;
  
  
  
      RET_IF_FAILED(pSample->ConvertToContiguousBuffer(&mediaBuffer), "Could not convert IMFSample to contagiuous buffer", E_FAIL);
  
      RET_IF_FAILED(mediaBuffer->GetCurrentLength(&length), "Could not get buffer length", E_FAIL);
  
      RET_IF_FAILED(mediaBuffer->Lock(&pDataNV12, NULL, NULL), "Could not lock the buffer", E_FAIL);
  
      BYTE *pDataYUV420P = new BYTE[length];
  
      this->convertNV12toYUV420P(pDataNV12, pDataYUV420P, this->width, this->height);
  
      RET_IF_FAILED(av_image_fill_arrays(frame->data, frame->linesize, pDataYUV420P, pixelFormat, this->width, this->height, 1), "Could not fill the frame with data from the buffer", E_FAIL);
  
      LOG_IF_FAILED(mediaBuffer->Unlock(), "Could not unlock the buffer");
  
  
  
      frame->pts = av_rescale_q(this->pts++, this->codecContext->time_base, this->stream->time_base);
  
  
  
      AVPacket pkt;
  
  
  
      av_init_packet(&pkt);
  
      pkt.data = NULL;
  
      pkt.size = 0;
  
  
  
      RET_IF_FAILED_AV(avcodec_send_frame(this->codecContext, frame), "Could not send the frame to the encoder", E_FAIL);
  
      delete[] pDataYUV420P;
  
      if (SUCCEEDED(avcodec_receive_packet(this->codecContext, &pkt))) {
  
          RET_IF_FAILED_AV(av_interleaved_write_frame(this->fmtContext, &pkt), "Could not write the received packet.", E_FAIL);
  
      }
  
  
  
      av_packet_unref(&pkt);
  
  
  
      return S_OK;
  
  }
  
  
  
  HRESULT Session::endSession() {
  
      LOG("Ending session...");
  
  
  
      LOG("Closing files...")
  
      LOG_IF_FAILED_AV(av_write_trailer(this->fmtContext), "Could not finalize the output file.");
  
      LOG_IF_FAILED_AV(avio_close(this->fmtContext->pb), "Could not close the output file.");
  
      LOG_IF_FAILED_AV(avcodec_close(this->codecContext), "Could not close the codec.");
  
      av_free(this->codecContext);
  
      LOG("Done.")
  
      return S_OK;
  
  }

  The problem is that the generated file is not playable in either VLC or MPC-HC. However, MPC-HC reports following info in file properties :

  General
  
  Unique ID                      : 202978442142665779317960161865934977227 (0x98B439D9BE859109BD5EC00A62A238CB)
  
  Complete name                  : T:\Test.mkv
  
  Format                         : Matroska
  
  Format version                 : Version 4 / Version 2
  
  File size                      : 24.6 MiB
  
  Duration                       : 147ms
  
  Overall bit rate               : 1 401 Mbps
  
  Writing application            : Lavf57.57.100
  
  Writing library                : Lavf57.57.100
  
  
  
  Video
  
  ID                             : 1
  
  Format                         : FFV1
  
  Format version                 : Version 0
  
  Codec ID                       : V_MS/VFW/FOURCC / FFV1
  
  Duration                       : 147ms
  
  Width                          : 1 280 pixels
  
  Height                         : 720 pixels
  
  Display aspect ratio           : 16:9
  
  Frame rate mode                : Constant
  
  Frame rate                     : 1 000.000 fps
  
  Color space                    : YUV
  
  Chroma subsampling             : 4:2:0
  
  Bit depth                      : 8 bits
  
  Compression mode               : Lossless
  
  Default                        : Yes
  
  Forced                         : No
  
  DURATION                       : 00:00:00.147000000
  
  coder_type                     : Golomb Rice

  Something to note is that it reports 1000 FPS which is weird since I’ve set AVCodecContext::time_base in the code.

  UPDATE 1 :

  I managed to set the correct fps by setting time_base property of the stream :

  this->stream->time_base.den = fps_num;
  
  this->stream->time_base.num = fps_den;

  VLC plays the output file but it shows VLC logo instead of the video, as if there is no video stream in the file.

  UPDATE 2 :

  Cleaned up the code. Now if I set codecId = AV_CODEC_ID_MPEG2VIDEO the output file is valid and is played in both VLC and MPC-HC. Using ffprobe on the file with FFV1 encoding yields the following result :

  C:\root\apps\ffmpeg>ffprobe.exe t:\test.avi
  
  ffprobe version 3.2 Copyright (c) 2007-2016 the FFmpeg developers
  
    built with gcc 5.4.0 (GCC)
  
    configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-libebur128 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      55. 34.100 / 55. 34.100
  
    libavcodec     57. 64.100 / 57. 64.100
  
    libavformat    57. 56.100 / 57. 56.100
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  [ffv1 @ 00000000006b83a0] read_quant_table error
  
  Input #0, avi, from 't:\test.avi':
  
    Metadata:
  
      encoder         : Lavf57.56.100
  
    Duration: 00:00:04.94, start: 0.000000, bitrate: 107005 kb/s
  
      Stream #0:0: Video: ffv1 (FFV1 / 0x31564646), yuv420p, 1280x720, 107717 kb/s, 29.97 fps, 29.97 tbr, 29.97 tbn, 29.97 tbc

• Long Overdue MediaWiki Upgrade

  5 février 2014, par Multimedia Mike — General

  What do I do ? What I do ? This library book is 42 years overdue !
  I admit that it’s mine, yet I can’t pay the fine,
  Should I turn it in or should I hide it again ?
  What do I do ? What do I do ?

  I internalized the forgoing paean to the perils of procrastination by Shel Silverstein in my formative years. It’s probably why I’ve never paid a single cent in late fees in my entire life.

  However, I have been woefully negligent as the steward of the MediaWiki software that drives the world famous MultimediaWiki, the internet’s central repository of obscure technical knowledge related to multimedia. It is currently running of version 1.6 software. The latest version is 1.22.

  The Story So Far
  According to my records, I first set up the wiki late in 2005. I don’t know which MediaWiki release I was using at the time. I probably conducted a few upgrades in the early days, but that went by the wayside perhaps in 2007. My web host stopped allowing shell access and the MediaWiki upgrade process pretty much requires running a PHP script from a command line. Upgrade time came around and I put off the project. Weeks turned into months turned into years until, according to some notes, the wiki abruptly stopped working in July, 2011. Suddenly, there were PHP errors about “Namespace” being a reserved word.

  While I finally laid out a plan to upgrade the wiki after all these years, I eventually found that the problem had been caused when my webhost upgraded from PHP 5.2 -> 5.3. I also learned of a small number of code changes that caused the problem to go away, thus kicking the can down the road once more.

  Then a new problem showed up last week. I think it might be related to a new version of PHP again. This time, a few other things on my site broke, and I learned that my webhost now allows me to select a PHP version to use (with the version then set to “auto”, which didn’t yield much information). Rolling back to an earlier version of PHP might have solved the problem easily.

  But NO ! I made the determination that this goes no further. I want this wiki upgraded.

  The Arduous Upgrade Path
  There are 2 general upgrade paths I can think of :
  

  1. Upgrade in place on the server
  2. Upgrade offline and put the site back on the server

  Approach #1 is problematic since I don’t have direct shell access, though I considered using something like PHP Shell. Approach #2 involves getting the entire set of wiki files and a backup of the MySQL tables. This is workable since I keep automated backups of these items anyway.

  In fairly short order, I was able to set up a working copy of the MultimediaWiki hosted on a local Linux machine. Now what’s the move ? The MediaWiki software I’m running is 1.6.10. The very latest, as of this upgrade project is 1.22.2. I suppose it’s way too much to hope that the software will upgrade cleanly from 1.6.x straight to 1.22.x, but I guess it’s worth a shot…

  HA ! No chance. Okay, next idea is to march through the various versions and upgrade each in turn. MediaWiki has all their historic releases online, all the way back to the 1.3 lineage. I decided that the latest of each lineage should upgrade cleanly from anything in the previous version of lineage. E.g., 1.6.10 should upgrade cleanly to 1.7.3 (last in the 1.7 series). This seemed to be a workable strategy. So I downloaded the latest of each series, unpacked, and copied all the wiki files over the working installation and ran ‘php update.php’ in the maintenance/ directory.

  The process is tedious and not without its obstacles. I consider this penance for my years of wiki neglect. First, I run into the “PHP Parse error : syntax error, unexpected T_NAMESPACE, expecting T_STRING” issue, the same that I saw years ago after the webhost transitioned from PHP 5.2 -> 5.3. I could solve this by editing assorted files and changing “Namespace” -> “MWNamespace” (which is what MediaWiki did by version 1.13). But I would prefer not to.

  Instead, I downloaded the source for PHP 5.2 and compiled it in a separate directory, then called ‘/path/to/php/5.2/bin/php update.php’. Problem solved.

  The next problem is that a bunch of the database update scripts are specifying “Type=InnoDB”. This isn’t supported by modern MySQL databases. Now, it’s “Engine=InnoDB”. A quick search & replace at the command line fixes this for 1.6.x… and 1.7.x… and 1.8 through 1.12. Finally, at 1.13, it was no longer necessary. As a bonus, at 1.13, I was able to test the installation since Namespace had been renamed to MWNamespace. I would later learn that the table type modifications probably could have been simplified in by changing “$wgDBmysql4 = true ;” to “$wgDBmysql5 = true ;” somewhere in LocalSettings.php.

  Command line upgrading worked smoothly up through 1.18 series when I got a new syntax error :

  <br />
PHP Fatal error:  Call to a member function addMessages() on a non-object in /mnt/sdb1/archive/wiki/extensions/Cite.php on line 68<br />

  Best I could do was comment out that line. I hope that doesn’t break anything important.

  In the home stretch, the very last transition (1.21 -> 1.22) failed :

  PHP Fatal error :  Cannot redeclare wfProfileIn() (previously declared in 
  /mnt/sdb1/archive/wiki/includes/profiler/Profiler.php:33) in 
  /mnt/sdb1/archive/wiki/includes/ProfilerStub.php on line 25
  

  Apparently, this problem arises occasionally since 1.18. I found a way around it thanks to this page : Deleted the file StartProfiler.php. Who am I to argue ?

  Upon completing the transition to 1.22, the wiki doesn’t look correct– the pictures aren’t showing up. The solution was to fix the temporary directory via LocalSettings.php.

  Back To Production
  Okay, it all works again ! Locally, that is. How to get it back to the server ? My first idea was that, knowing that this upgrade process can succeed, try stepping through the upgrade process again, but tell the update.php scripts to access the database tables on multimedia.cx. This seemed to be working for awhile, even though the database update phase often took 4-5 minutes. However, the transition from 1.8.5 -> 1.9.6 took 75 minutes and then timed out. According to my notes, “This isn’t going to work.”

  The new process :

  1. Dump the database tables from the local database.
  2. Create a new database remotely (melanson_wiki_ng).
  3. Dump the database table into melanson_wiki_ng.
  4. Move the index.php file out of the wiki files directory temporarily (or rename).
  5. Modify the LocalSettings.php to talk to the new database.
  6. Perform a lftp mirror operation in order to send all the files up to the server.
  7. Send the index.php file and hope beyond hope that everything magically works.

  And that’s the story of how the updated MultimediaWiki came back online. Despite the database dump file being over 110 MB, it only tool MySQL 1m45s to transmit it all to the remote server (let’s hear it for the ‘–compress’ option). For comparison, inserting the tables back into a fresh local database took 1m07s.

  When the MultimediaWiki was first live again, it loaded, but ever so slowly. This is when I finally looked into optimization and found that I was lacking any caching. So as a bonus, the MultimediaWiki should be much faster now.

  Going Forward
  For all I know, I did everything described here in the hardest way possible. But at least I got it done. Unless I learn of a better process, future upgrades will probably look similar to this.

  Additionally, I should probably take some time to figure out what new features are part of the standard MediaWiki distribution nowadays.

• 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 ?