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• How can I encode a video to play on a DLink DSM-520 using FFMPEG ?

  4 octobre 2015, par tolsen64

  I have been searching, testing, and coming up with nothing for over a week. I want to use FFMPEG to convert mp4’s and mkv’s to AVI files that will play on my DLink DSM-520. Mencoder will do it. The files that FFMPEG generates cause the player to lock up less than a minute into the video. First, here’s what I use to encode the file using Mencoder (scraped from the test.bat file that PocketDIVXEncoder generates :

  mencoder.exe ftwd105.mp4 -af volnorm -srate 44100 -oac mp3lame -lameopts mode=0:cbr:br=128 -noodml -vf pp=ac,scale=720:404,crop=720:400,harddup -sws 9 -ovc lavc -lavcopts vcodec=mpeg4:mbd=1:last_pred=2:vstrict=1:threads=2:vmax_b_frames=0:vbitrate=1200 -ffourcc XVID -o ftwd105_HDTV.avi

  The output file plays perfectly on the DSM-520. Looking at the file using FFPROBE, I see this :

  Input #0, avi, from 'ftwd105_HDTV.avi':
  
    Metadata:
  
      encoder         : MEncoder Redxii-SVN-r37527-4.9.3 (x86_64)
  
    Duration: 00:44:32.96, start: 0.000000, bitrate: 1193 kb/s
  
      Stream #0:0: Video: mpeg4 (Simple Profile) (XVID / 0x44495658), yuv420p, 720x400 [SAR 1:1 DAR 9:5], 1053 kb/s, 23.98 fps, 23.98 tbr, 23.98 tbn, 24k tbc
  
      Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, stereo, s16p, 128 kb/s

  So now I try the same thing with FFMPEG.

  ffmpeg -i ftwd105.mp4 -vcodec mpeg4 -vtag XVID -b:v 1200k -s 720x400 -acodec libmp3lame -ab 128k -ar 44100 -ac 2 -f avi ftwd105_ffmpeg.avi

  This file does not play on the media player. It plays choppy with only clicking for sound for about 15-30 seconds, then it freezes. Looking at it with FFPROBE, it looks exactly the same as the one created by Mencoder.

  Input #0, avi, from 'ftwd105_ffmpeg.avi':
  
    Metadata:
  
      encoder         : Lavf57.0.100
  
    Duration: 00:44:33.14, start: 0.000000, bitrate: 1305 kb/s
  
      Stream #0:0: Video: mpeg4 (Simple Profile) (XVID / 0x44495658), yuv420p, 720x400 [SAR 1:1 DAR 9:5], 1165 kb/s, 23.98 fps, 23.98 tbr, 23.98 tbn, 24k tbc
  
      Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, stereo, s16p, 128 kb/s

  So now I encode the video using Xvid4PSP. It plays perfectly fine and FFPROBE shows this :

  Input #0, avi, from 'ftwd105_ps2.avi':
  
    Metadata:
  
      encoder         : VirtualDubMod 1.5.10.3 | www.virtualdub-fr.org || (build 2550/release)
  
    Duration: 00:44:33.09, start: 0.000000, bitrate: 861 kb/s
  
      Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 720x400 [SAR 1:1 DAR 9:5], 723 kb/s, 23.98 fps, 23.98 tbr, 23.98 tbn, 23.98 tbc
  
      Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p, 128 kb/s

  It’s using Advanced Simple Profile so I look this up and change my FFMPEG options :

  ffmpeg -i ftwd105.mp4 -vcodec mpeg4 -vtag XVID -b:v 1200k -s 720x400 -profile:v 15 -level 0 -acodec libmp3lame -ab 128k -ar 44100 -ac 2 -f avi ftwd105_ffmpeg.avi

  But though the output file looks the same using FFPROBE as the one made by Xvid4PSP, it still doesn’t play on the DSM-520.

  Input #0, avi, from 'ftwd105_ffmpeg_asp.avi':
  
    Metadata:
  
      encoder         : Lavf57.0.100
  
    Duration: 00:44:33.14, start: 0.000000, bitrate: 1305 kb/s
  
      Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 720x400 [SAR 1:1 DAR 9:5], 1165 kb/s, 23.98 fps, 23.98 tbr, 23.98 tbn, 24k tbc
  
      Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, stereo, s16p, 128 kb/s

  So now i’m at a loss. Is FFMPEG incapable of generating a file that the DSM-520 can play ? The reason I want to use FFMPEG over Mencoder is that it’s much faster. What takes FFMPEG 15 minutes takes Mencoder 40.

  I should note that all the files created by FFMPEG play fine on the PC and on my Visio television. The DSM-520 is hooked up to a bedroom tv that isn’t a smart tv.

  Edit : I also tried libxvid in place of mpeg4 with the same results.

• lavc/aacenc_utils : replace sqrtf(Q*sqrtf(Q)) by precomputed value

  1er mars 2016, par Ganesh Ajjanagadde

  lavc/aacenc_utils : replace sqrtf(Q*sqrtf(Q)) by precomputed value
  It makes no sense whatsoever to do this at each function call ; we
  
  already have a table for this.
  Yields a 2x improvement in find_min_book (x86-64, Haswell+GCC) :
  
  ffmpeg -i sin.flac -acodec aac -y sin.aac
  
  find_min_book
  
  old
  
      605 decicycles in find_min_book, 8388453 runs,    155 skips.9x
  
      606 decicycles in find_min_book,16776912 runs,    304 skips.9x
  
      607 decicycles in find_min_book,33553819 runs,    613 skips.2x
  
      607 decicycles in find_min_book,67107668 runs,   1196 skips.3x
  
      607 decicycles in find_min_book,134215360 runs,   2368 skips3x
  new
  
      359 decicycles in find_min_book, 8388552 runs,     56 skips.3x
  
      360 decicycles in find_min_book,16777112 runs,    104 skips.1x
  
      361 decicycles in find_min_book,33554218 runs,    214 skips.4x
  
      361 decicycles in find_min_book,67108381 runs,    483 skips.5x
  
      361 decicycles in find_min_book,134216725 runs,   1003 skips5x
  and more importantly a non-negligible speedup ( 8%) to overall AAC encoding :
  
  old :
  
  ffmpeg -i sin.flac -acodec aac -strict -2 -y sin_new.aac  6.82s user 0.03s system 104% cpu 6.565 total
  
  new :
  
  ffmpeg -i sin.flac -acodec aac -strict -2 -y sin_old.aac  6.24s user 0.03s system 104% cpu 5.993 total
  This also improves accuracy of the expression by 2 ulp in some cases.
  Reviewed-by : Derek Buitenhuis <derek.buitenhuis@gmail.com>
  
  Reviewed-by : Rostislav Pehlivanov <atomnuker@gmail.com>
  
  Signed-off-by : Ganesh Ajjanagadde <gajjanag@gmail.com>
  

  • [DH] libavcodec/aacenc_utils.h

• ffmpeg creating mp4 vs mp4

  23 octobre 2015, par user1207446

  I have two mp4 files. One of them was given to me and plays well under mediawiki (using the MediawikiPlayer extension). The other I created from a WMV file and it does not play. When I look at the two files through the eyes of ffprobe, they appear to be very different. The working file returns this :

  Metadata:
  
    major_brand     : mp42
  
    minor_version   : 0
  
    compatible_brands: mp42isomavc1
  
    creation_time   : 2013-12-28 20:25:51
  
    encoder         : HandBrake 0.9.9 2013052900
  
  Duration: 00:00:17.05, start: 0.000000, bitrate: 957 kb/s
  
    Chapter #0:0: start -0.066733, end 17.017000
  
    Metadata:
  
      title           : Chapter 1
  
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709), 704x480 [SAR 10:11 DAR 4:3], 824 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 180k tbc (default)
  
    Metadata:
  
      creation_time   : 2013-12-28 20:25:51
  
      encoder         : JVT/AVC Coding
  
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
    Metadata:
  
      creation_time   : 2013-12-28 20:25:51
  
    Stream #0:2(und): Subtitle: mov_text (text / 0x74786574), 0 kb/s
  
    Metadata:
  
      creation_time   : 2013-12-28 20:25:51

  The non-working produces this :

  Metadata:
  
    major_brand     : isom
  
    minor_version   : 512
  
    compatible_brands: isomiso2mp41
  
    encoder         : Lavf55.0.100
  
  Duration: 00:05:25.79, start: 0.033333, bitrate: 1331 kb/s
  
    Stream #0:0(eng): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 704x528 [SAR 1:1 DAR 4:3], 1198 kb/s, 25 fps, 25 tbr, 12800 tbn, 25 tbc (default)
  
    Metadata:
  
      handler_name    : VideoHandler
  
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
    Metadata:
  
      handler_name    : SoundHandler

  What ffmpeg options do I need to supply to convert my wmv file to an mp4 file like the first of those listed here (the working one) ?

  Update : 2015-10-23, here is the full output from ffmpeg for the non-working file :

  E:\>ffmpeg -i non-working.mp4
  
  ffmpeg version N-71329-g235589e Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.9.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libblu
  
  ray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enab
  
  le-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --ena
  
  ble-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --ena
  
  ble-decklink --enable-zlib
  
    libavutil      54. 22.101 / 54. 22.101
  
    libavcodec     56. 34.100 / 56. 34.100
  
    libavformat    56. 30.100 / 56. 30.100
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 13.101 /  5. 13.101
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'non-working.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2mp41
  
      encoder         : Lavf55.0.100
  
    Duration: 00:10:12.94, start: 0.033333, bitrate: 1324 kb/s
  
      Stream #0:0(eng): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 704x528 [SAR 1:1 DAR 4:3], 1191 kb/s, 25 fps, 25 tbr, 12800 tbn, 25 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  At least one output file must be specified