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• Convert RTP packets to WAV or AU using ffmpeg

  14 octobre 2014, par Jonas Kongslund

  I have a file containing a sequence of RTP packets wrapped in UDP/IP packets. I want to convert this file to a WAV or AU file and was told that ffmpeg may be able to do the job. However the tool does not behave as I would expect. For some reason it is expecting an SDP file but I do not have such a file and I am wondering why it is needed since the RTP packets seem to contain enough information in order to do the conversion. Also it is reporting the wrong payload type.

  Any ideas ? Below is what I have tried. The RTP packets in the input file alaw.rtp only have payload types 8 (A-law) and 72 (RTCP related) so I do not know where payload type 105 is coming from.

  $ ffmpeg -f rtp -i alaw.rtp alaw.au
  
  ...
  
  [rtp @ 0x9dbdfe0] Unsupported RTP version packet received
  
      Last message repeated 89 times
  
  [rtp @ 0x9dbdfe0] Unable to receive RTP payload type 105 without an SDP file describing it
  
  [rtp @ 0x9dbdfe0] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, rtp, from 'alaw.rtp':
  
    Duration: N/A, bitrate: N/A
  
  File 'alaw.au' already exists. Overwrite ? [y/N] y
  
  Output #0, au, to 'alaw.au':
  
  Output file #0 does not contain any stream

  This is the version of ffmpeg that I have used

  ffmpeg version 0.10.6-6:0.10.6-0ubuntu0jon1~lucid2
  
  built on Nov 12 2012 15:20:22 with gcc 4.4.3

• FFmpeg error m4v to flv requested bitrate is too low

  20 décembre 2012, par Pradeep Singh

  ---

  FFMPEG OUTPUT

  ---

  COMMAND

  /usr/local/bin/ffmpeg -i '/home/machine/public_html/video_1355531272.m4v' -s '640x480' -sameq -ab '64k' -ar '44100' -f 'flv' -pass '1' -passlogfile '/home/machine/public_html/tmp/1355531273-50cbc4090d696-multipass'  -y /home/machine/public_html/tmp/1355531273-50cbc4090d2a9.flv &> /home/machine/public_html/tmp/1355531273-50cbc4090da7c.info
  
  /usr/local/bin/ffmpeg -i '/home/machine/public_html/video_1355531272.m4v' -s '640x480' -sameq -ab '64k' -ar '44100' -f 'flv' -pass '2' -passlogfile '/home/machine/public_html/tmp/1355531273-50cbc4090d696-multipass'  -y /home/machine/public_html/tmp/1355531273-50cbc4090d2a9.flv &> /home/machine/public_html/tmp/1355531273-50cbc4090da7c.info
  
  eng): Video: h264, yuv420p, 960x540, 3428 kb/s, 29.97 fps, 29.97 tbr, 2997 tbn, 5994 tbc
  
      Metadata:
  
        creation_time   : 2012-12-14 22:50:55
  
      Stream #0.1(eng): Audio: aac, 44100 Hz, stereo, s16, 111 kb/s
  
      Metadata:
  
        creation_time   : 2012-12-14 22:50:55
  
  [buffer @ 0xdd079d0] w:960 h:540 pixfmt:yuv420p
  
  [scale @ 0xdd07da0] w:960 h:540 fmt:yuv420p -> w:640 h:480 fmt:yuv420p flags:0xa0000004
  
  [flv @ 0xdd041c0] requested bitrate is too low
  
  Output #0, flv, to '/home/machine/public_html/tmp/1355531273-50cbc4090d2a9.flv':
  
      Stream #0.0(eng): Video: flv, yuv420p, 640x480, q=2-31, pass 2, 200 kb/s, 90k tbn, 29.97 tbc
  
      Metadata:
  
        creation_time   : 2012-12-14 22:50:55
  
      Stream #0.1(eng): Audio: adpcm_swf, 44100 Hz, stereo, s16, 64 kb/s
  
      Metadata:
  
        creation_time   : 2012-12-14 22:50:55
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
    Stream #0.1 -> #0.1
  
  Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height
  
  -------------------------------
  
  RESULT
  
  -------------------------------
  
  Execute error. Output for file "/home/machine/public_html/video_1355531272.m4v" was found, but the file contained no data. Please check the available codecs compiled with FFmpeg can support this type of conversion. You can check the encode decode availability by inspecting the output array from PHPVideoToolkit::getFFmpegInfo().

• how to configure ffmpeg to transplant to iphone sdk 5.1 simulator and play h264 ?

  19 décembre 2012, par user1204703

  I use lastest "ffmpeg-1.0.1" and "ffmpeg-iphone-build",to transplant fffmpeg to iphone sdk 5.1 simulator.

  and use the build-i386 script in the "ffmpeg-iphone-build" project . also I add "—enable-decoder=h264" to the "CONFIGURE_OPTIONS".

  just this :

  CONFIGURE_OPTIONS="--enable-gpl --enable-postproc --enable-swscale --enable-avfilter --disable-asm --enable-cross-compile --enable-decoder=h264"

  then execute "./build-i386".
  and I also execute below batch :

  #!/bin/tcsh -f
  
  
  
  mkdir universal
  
  
  
  mkdir lib
  
  
  
  
  
  mkdir i386
  
  
  
  
  
  mv ffmpeg-i386/libavcodec/libavcodec.a i386/
  
  
  
  mv ffmpeg-i386/libavdevice/libavdevice.a i386/
  
  
  
  mv ffmpeg-i386/libavformat/libavformat.a i386/
  
  
  
  mv ffmpeg-i386/libavutil/libavutil.a i386/
  
  
  
  mv ffmpeg-i386/libswscale/libswscale.a i386/
  
  
  
  
  
  
  
  rm universal/*.a
  
  
  
  lipo -create -arch i386 i386/libavcodec.a -output universal/libavcodec.a
  
  
  
  lipo -create -arch i386 i386/libavdevice.a -output universal/libavdevice.a
  
  
  
  lipo -create -arch i386 i386/libavformat.a -output universal/libavformat.a
  
  
  
  lipo -create -arch i386 i386/libavutil.a -output universal/libavutil.a
  
  
  
  lipo -create -arch i386 i386/libswscale.a -output universal/libswscale.a
  
  
  
  rm lib/*.a
  
  
  
  cp universal/*.a lib/

  then I use the "iFreameExtractor" demo, modify the video file to "test.h264".
  code like :

  - (void)applicationDidFinishLaunching:(UIApplication *)application {    
  
      self.video = [[VideoFrameExtractor alloc] initWithVideo:[Utilities bundlePath:@"test.h264"]];
  
  }

  then run with IPhone 5.1 Simulator.
  but, fail with error :

  [h264 @ 0x91f1800] max_analyze_duration 5000000 reached at 5019130
  
  [h264 @ 0x91f1800] Estimating duration from bitrate, this may be inaccurate
  
  [swscaler @ 0x9203600] No accelerated colorspace conversion found from yuv420p to rgb24.
  
  2012-12-19 20:19:54.419 iFrameExtractor[52708:f803] video duration: -9223372036854.775391

  I think that the reason why it can not play h264 file that when I transplant the fffmpeg to the iphone simulator, and maybe do something wrong with the configure options.
  but I do not know how to fix it.

  Can you show the correct configure or other advices ?

  Thanks for your reply ??
  I am going to crash.