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• How to insert dynamic metadata for every video frame ? [closed]

  16 juin 2021, par HoustonZHU

  I can calculate the HDR dynamic metadata for a single given HDR yuv video frame, such as maximum Y value, minimum Y value.(for simplification of this question,suppose the dynamic metadata for each video frame only consists of these 2 values).

  


  Now what is the best way to work on mp4 video file(e.g h265 stream) to insert the above dynamic metadata for each video frame in the stream ?
obviously we need to decode the stream first, and then at some point for each decoded video stream, I do the calculation to get the two values. then I need to use SEI related API to insert these two values to SEI payload of the encoded stream.
I hope this question is more clear now.

  


• SRT : No Room to Store Incoming Packets when we stream SRT streams through VLC

  10 février, par Shankar

  Hope all you are doing well.

  


  Actually i was trying to stream a media file using VLC by SRT protocol. For which, srt-live-transmit is used as converter in between SRT Listener and VLC UDP streams. srt-live-transmit used to convert udp to srt streams(mpegts). But when i tried to do that, after few seconds, i got error in srt-live-transmit terminal that :
No room to store incoming packet :

  


  What should be the reason for this error ? And if anyone know anything about this problem, please share info. It would be helpful.
Thank you.

  


• FFmpeg make : *** [libavdevice/avfoundation.o] Error 1

  29 décembre 2014, par Althen Lim Zi Xuan

  I’m very new (1 weeks ago) to Mac OS environment and I have to create a iPhone apps using FFmpeg (I’m new to this, too !). This is what I’ve done to import FFmpeg library.

  First, here’s the environment :

  OS: Mac OS X 10.7.5
  
  Xcode: 4.5
  
  FFmpeg: 2.5 (Latest update of 04/12/2014)

  So I download from FFmpeg.org using command :

  git clone git://source.ffmpeg.org/ffmpeg.git ~/ffmpeg

  and create the folder in it :

  cd ffmpeg
  
  mkdir i386
  
  mkdir armv7
  
  mkdir armv7s
  
  mkdir -p universal/lib

  I download the gas-preprocessor.pl from yuvi and copied into /usr/bin and /usr/local/bin with READ/WRITE access for all.

  However, I do encounter the error as title mentions during the making process of armv7 and armv7s which appear like this :

  make: *** [libavdevice/avfoundation.o] Error 1

  Can anyone teach me how to deal with it ? Here’s my configuration.

  For i386 : (Compilation success and I saw files and folder in i386 folder)

  ./configure --cc="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc" --as="/usr/local/bin/gas-preprocessor.pl /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/llvm-gcc-4.2/bin/arm-apple-darwin10-llvm-gcc-4.2" --sysroot="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.0.sdk" --target-os=darwin --arch=i386 --cpu=i386 --extra-cflags="-arch i386" --extra-ldflags="-arch i386 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.0.sdk"--prefix=compiled/i386 --enable-cross-compile --enable-nonfree --enable-gpl --disable-armv5te --disable-swscale-alpha --disable-doc --disable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --disable-asm --disable-debug

  For armv7 :

  ./configure --cc=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc --as="/usr/local/bin/gas-preprocessor.pl /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/llvm-gcc-4.2/bin/arm-apple-darwin10-llvm-gcc-4.2" --sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk --target-os=darwin --arch=arm --cpu=cortex-a8 --extra-cflags="-arch armv7" --extra-ldflags="-arch armv7 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk" --prefix=compiled/armv7 --enable-cross-compile --enable-nonfree --enable-gpl --disable-armv5te --disable-swscale-alpha --disable-doc --disable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --disable-asm --disable-debug

  and for armv7s :

  ./configure --prefix=armv7s --as="/usr/local/bin/gas-preprocessor.pl /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/llvm-gcc-4.2/bin/arm-apple-darwin10-llvm-gcc-4.2" --disable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --enable-avresample --enable-cross-compile --sysroot="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk" --target-os=darwin --cc="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc" --extra-cflags="-arch armv7s -mfpu=neon -miphoneos-version-min=6.0" --extra-ldflags="-arch armv7s -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk -miphoneos-version-min=6.0" --arch=arm --cpu=cortex-a9 --enable-pic

  If any necessary information needed please do inform me and I will upload it A.S.A.P. Any help, comment, guideline are highly appreciated. Thanks !

  Updated :
  This is the error I received during the making process. I have no idea but hope that it helps in configuring out problem :

  CC  libavdevice/alldevices.o
  
  CC  libavdevice/avdevice.o
  
  CC  libavdevice/avfoundation.o
  
  libavdevice/avfoundation.m:44: error: initializer element is not constant
  
  libavdevice/avfoundation.m:44: error: (near initialization for ‘avf_time_base_q.den’)
  
  libavdevice/avfoundation.m:74:5: warning: "__MAC_OS_X_VERSION_MIN_REQUIRED" is not defined
  
  libavdevice/avfoundation.m: In function ‘add_video_device’:
  
  libavdevice/avfoundation.m:300: warning: ISO C90 forbids mixed declarations and code
  
  libavdevice/avfoundation.m:355: warning: ISO C90 forbids mixed declarations and code
  
  libavdevice/avfoundation.m:364: warning: ISO C90 forbids mixed declarations and code
  
  libavdevice/avfoundation.m: In function ‘add_audio_device’:
  
  libavdevice/avfoundation.m:407: warning: ISO C90 forbids mixed declarations and code
  
  libavdevice/avfoundation.m: In function ‘get_video_config’:
  
  libavdevice/avfoundation.m:432: warning: ISO C90 forbids mixed declarations and code
  
  libavdevice/avfoundation.m:442: warning: ISO C90 forbids mixed declarations and code
  
  libavdevice/avfoundation.m: In function ‘get_audio_config’:
  
  libavdevice/avfoundation.m:470: warning: ISO C90 forbids mixed declarations and code
  
  libavdevice/avfoundation.m:480: warning: ISO C90 forbids mixed declarations and code
  
  libavdevice/avfoundation.m: In function ‘avf_read_header’:
  
  libavdevice/avfoundation.m:534: warning: ISO C90 forbids mixed declarations and code
  
  libavdevice/avfoundation.m:539:5: warning: "__MAC_OS_X_VERSION_MIN_REQUIRED" is not defined
  
  libavdevice/avfoundation.m:546: warning: ISO C90 forbids mixed declarations and code
  
  libavdevice/avfoundation.m:554:5: warning: "__MAC_OS_X_VERSION_MIN_REQUIRED" is not defined
  
  libavdevice/avfoundation.m:575: warning: ISO C90 forbids mixed declarations and code
  
  libavdevice/avfoundation.m:596:5: warning: "__MAC_OS_X_VERSION_MIN_REQUIRED" is not defined
  
  libavdevice/avfoundation.m:619:5: warning: "__MAC_OS_X_VERSION_MIN_REQUIRED" is not defined
  
  libavdevice/avfoundation.m: In function ‘avf_read_packet’:
  
  libavdevice/avfoundation.m:724: warning: ISO C90 forbids mixed declarations and code
  
  libavdevice/avfoundation.m:739: warning: ISO C90 forbids mixed declarations and code
  
  libavdevice/avfoundation.m:776: warning: ISO C90 forbids mixed declarations and code
  
  make: *** [libavdevice/avfoundation.o] Error 1