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• FFMPEG : MP4 videos are not palying properly in iPhone, iPod, iPad

  25 mai 2012, par Shakti Singh

  I am converting videos from m4v, flv to MP4 for iPhone, iPod, iPad.

  I am using the below command to convert these videos

  ffmpeg -y -i video_1336500693.m4v -vcodec libx264 -vpre slow -vpre
  ipod640 -b 250k -bt 50k -acodec libfaac -ab 56k -ac 2 -s 480x320
  video_1336500693.mp4

  The video part of this mp4 file is working fine but the audio is not working properly. I am using HTML5 for this.

  The audio works for first 8-10 seconds but after that audio does not work and the strange thing is if I jump to forward or backward the audio works.

  Can anyone suggest what's going wrong ?

  Thanks

• FFMPEG : MP4 videos are not playing properly in iPhone, iPod, iPad

  26 janvier 2020, par Shakti Singh

  I am converting videos from m4v, flv to MP4 for iPhone, iPod, iPad.

  I am using the below command to convert these videos

  ffmpeg -y -i video_1336500693.m4v -vcodec libx264 -vpre slow -vpre
  ipod640 -b 250k -bt 50k -acodec libfaac -ab 56k -ac 2 -s 480x320
  video_1336500693.mp4

  The video part of this mp4 file is working fine but the audio is not working properly. I am using HTML5 for this.

  The audio works for first 8-10 seconds but after that audio does not work and the strange thing is if I jump to forward or backward the audio works.

  Can anyone suggest what’s going wrong ?

• 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.