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• Converting Real Media with ffmpeg

  7 août 2013, par Eric Arenson

  I have a number of old crusty Real Media files I need to convert and was hoping to write a script to batch process them. I'm able to do a Real Media -> AVI conversion with FFMpegX, but when I try to replicate the conversion with ffmpeg, it always errors out with something like :

  [avi @ 0x10084fa00] Too large number of skipped frames 117425 > 60000

  It may have something to do with the funky format of these Real Media files :

  Duration: 01:28:23.42, start: 0.000000, bitrate: 448 kb/s
  
      Stream #0:0: Data: none, 32 kb/s
  
      Stream #0:1: Data: none, 192 kb/s
  
      Stream #0:2: Audio: sipr (sipr / 0x72706973), 8000 Hz, mono, flt, 6 kb/s
  
      Stream #0:3: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 13 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
  
      Stream #0:4: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 8 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
  
      Stream #0:5: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 5 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
  
      Stream #0:6: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 27 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
  
      Stream #0:7: Audio: cook (cook / 0x6B6F6F63), 22050 Hz, mono, fltp, 32 kb/s
  
      Stream #0:8: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 192 kb/s, 30 fps, 30 tbr, 1k tbn, 1k tbc
  
      Stream #0:9: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 136 kb/s, 30 fps, 30 tbr, 1k tbn, 1k tbc
  
      Stream #0:10: Audio: sipr (sipr / 0x72706973), 8000 Hz, mono, flt, 6 kb/s
  
      Stream #0:11: Audio: sipr (sipr / 0x72706973), 8000 Hz, mono, flt, 6 kb/s
  
      Stream #0:12: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 13 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
  
      Stream #0:13: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 13 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
  
      Stream #0:14: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 13 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
  
      Stream #0:15: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 5 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc

  Does anyone have any tips on either how to find out what FFMpegX is doing to make the conversion work, or a better way to go about using ffmpeg to do this ?

  EDIT

  Including the ffmpeg command (thank you to @Mondain for teaching me about the stream mapping !) and output :

  Command :

  ffmpeg -i cc121307pm.rm -map 0:8 -map 0:7 -c:v libx264 -c:a libfaac -b:a 32k test.avi

  Output :

  ffmpeg version 1.2.1 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Aug  7 2013 12:29:30 with gcc 4.2.1 (GCC) (Apple Inc. build 5664)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/1.2.1 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=/usr/bin/gcc-4.2 --host-cflags='-Os -w -pipe -march=core2 -msse4.1 -mmacosx-version-min=10.6' --host-ldflags=-L/usr/local/lib --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid
  
    libavutil      52. 18.100 / 52. 18.100
  
    libavcodec     54. 92.100 / 54. 92.100
  
    libavformat    54. 63.104 / 54. 63.104
  
    libavdevice    54.  3.103 / 54.  3.103
  
    libavfilter     3. 42.103 /  3. 42.103
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  2.100 / 52.  2.100
  
  [rm @ 0x10180f200] Unsupported stream type 00000265
  
  [rm @ 0x10180f200] Unsupported stream type 00000652
  
  [rm @ 0x10180f200] max_analyze_duration 5000000 reached at 5004000 microseconds
  
  Input #0, rm, from 'input.rm':
  
    Metadata:
  
      File ID         : 41deac0f-94fb-3595-325c-c717943bc532
  
      Content Rating  : (PICS-1.1 "http://www.classify.org/safesurf" labels comment "RealProducer Plus 8.5.0.200 Windows" ratings (SS~~000 1))
  
      Modification Date: 12/13/2007 16:26:16
  
      Generated By    : RealProducer Plus 8.5.0.200 Windows
  
      Keywords        : 
  
      Abstract        : 
  
      Target Audiences: 28K Modem (20 Kbps);56K Modem (34 Kbps);256K DSL/Cable Modem (225 Kbps);
  
      Video Quality   : Normal Motion Video
  
      Audio Format    : Voice Only
  
      Creation Date   : 12/13/2007 14:57:49
  
      ASMRuleBook     : #($Bandwidth < 15000),Stream2Bandwidth = 6500, Stream3Bandwidth = 5499;#($Bandwidth >= 15000) && ($Bandwidth < 20000),Stream2Ba
  
      title           : 
  
      author          : 
  
      copyright       : ?2007
  
      comment         : 
  
    Duration: 01:28:23.42, start: 0.000000, bitrate: 448 kb/s
  
      Stream #0:0: Data: none, 32 kb/s
  
      Stream #0:1: Data: none, 192 kb/s
  
      Stream #0:2: Audio: sipr (sipr / 0x72706973), 8000 Hz, mono, flt, 6 kb/s
  
      Stream #0:3: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 13 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
  
      Stream #0:4: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 8 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
  
      Stream #0:5: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 5 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
  
      Stream #0:6: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 27 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
  
      Stream #0:7: Audio: cook (cook / 0x6B6F6F63), 22050 Hz, mono, fltp, 32 kb/s
  
      Stream #0:8: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 192 kb/s, 30 fps, 30 tbr, 1k tbn, 1k tbc
  
      Stream #0:9: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 136 kb/s, 30 fps, 30 tbr, 1k tbn, 1k tbc
  
      Stream #0:10: Audio: sipr (sipr / 0x72706973), 8000 Hz, mono, flt, 6 kb/s
  
      Stream #0:11: Audio: sipr (sipr / 0x72706973), 8000 Hz, mono, flt, 6 kb/s
  
      Stream #0:12: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 13 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
  
      Stream #0:13: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 13 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
  
      Stream #0:14: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 13 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
  
      Stream #0:15: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 5 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
  
  [libx264 @ 0x101889c00] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.1 Cache64
  
  [libx264 @ 0x101889c00] profile High, level 1.3
  
  Output #0, avi, to 'test.avi':
  
    Metadata:
  
      File ID         : 41deac0f-94fb-3595-325c-c717943bc532
  
      Content Rating  : (PICS-1.1 "http://www.classify.org/safesurf" labels comment "RealProducer Plus 8.5.0.200 Windows" ratings (SS~~000 1))
  
      Modification Date: 12/13/2007 16:26:16
  
      Generated By    : RealProducer Plus 8.5.0.200 Windows
  
      Keywords        : 
  
      Abstract        : 
  
      Target Audiences: 28K Modem (20 Kbps);56K Modem (34 Kbps);256K DSL/Cable Modem (225 Kbps);
  
      Video Quality   : Normal Motion Video
  
      Audio Format    : Voice Only
  
      Creation Date   : 12/13/2007 14:57:49
  
      ASMRuleBook     : #($Bandwidth < 15000),Stream2Bandwidth = 6500, Stream3Bandwidth = 5499;#($Bandwidth >= 15000) && ($Bandwidth < 20000),Stream2Ba
  
      INAM            : 
  
      author          : 
  
      ICOP            : ?2007
  
      ICMT            : 
  
      ISFT            : Lavf54.63.104
  
      Stream #0:0: Video: h264 (H264 / 0x34363248), yuv420p, 320x240, q=-1--1, 30 tbn, 30 tbc
  
      Stream #0:1: Audio: aac ([255][0][0][0] / 0x00FF), 22050 Hz, mono, s16, 32 kb/s
  
  Stream mapping:
  
    Stream #0:8 -> #0:0 (rv20 -> libx264)
  
    Stream #0:7 -> #0:1 (cook -> libfaac)
  
  Press [q] to stop, [?] for help
  
  [rm @ 0x10180f200] DATA tag in middle of chunk, file may be broken.
  
  Truncating packet of size 775215378 to 283607526
  
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  input.rm: Input/output error
  
  frame=    0 fps=0.0 q=0.0 Lsize=      10kB time=00:00:00.00 bitrate=N/A    
  
  video:0kB audio:0kB subtitle:0 global headers:0kB muxing overhead inf%
  
  Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)

• Compression results using ffmpeg to loop video

  4 septembre 2013, par Frank Schwieterman

  I have a videofile whose duration is being increased x8, which is having a corresponding file size increase of x6. The compression is doing good generally, but since I am increasing the video duration by looping the video, I wonder if its possible to get better compression results ? Hypothetically, since I'm replaying the same content, there could be much more compression. I suspect its not actually possible, but since I'm no expert on ffmpeg or video compression I thought I'd ask.

  I am looping the file using simple .mp4 file concatentation, then converting back to mp4 with ffmpeg.

• Révision 20803 : La fonction f_admin utilisée dans le pipeline affichage_final pour insérer les b...

  5 septembre 2013, par esj -

  A noter beaucoup d’incohérences de la part des navigateurs lors d’un Content-Type annoncé comme du PDF :
  * Safari ignore à raison mais en silence la balise Link en début de texte ;
  * Si on l’encode en base64, Safari se plaint alors qu’il ne commance pas par "%PDF-" ;
  * Firefox dit que le texte est du PDF incorrect et n’affiche rien dans les deux cas ;
  * Si on ne met pas de Content-Length, Firebug signale une "Uncaught exception" sans plus de précision.