Recherche avancée

Sur d’autres sites (9804)

• Compiling ffmpeg for iOS and gas-preprocessor.pl

  16 mai 2017, par user500

  I want to compile ffmpeg for iOS. I did it a few times before. But now I’m on clean new Mavericks and on configure I’m always getting

  Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
  
  Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
  
  GNU assembler not found, install gas-preprocessor
  
  
  
  If you think configure made a mistake, make sure you are using the latest
  
  version from Git.  If the latest version fails, report the problem to the
  
  ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
  
  Include the log file "config.log" produced by configure as this will help
  
  solving the problem.

  I have current Xcode installed. Also brews. And current gas-preprocessor.pl (https://github.com/yuvi/gas-preprocessor) in usr/bin and also in usr/local/bin.

  ---

  On perl /usr/bin/gas-preprocessor.pl gcc I’m getting Unrecognized input filetype at /usr/bin/gas-preprocessor.pl line 33.

  ---

  This config works :

  ./configure \
  
  --extra-cflags='-arch arm64 -mios-version-min=7.0 -mthumb' \
  
  --extra-ldflags='-arch arm64 -mios-version-min=7.0' \
  
  --enable-cross-compile \
  
  --arch=arm64 \
  
  --target-os=darwin \
  
  --cc=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang \
  
  --sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk \
  
  --prefix=arm64 \
  
  --disable-doc \
  
  --disable-shared \
  
  --disable-everything \
  
  --enable-static \
  
  --enable-pic \
  
  --disable-muxers \
  
  --enable-muxer=flv \
  
  --disable-demuxers \
  
  --enable-demuxer=h264 \
  
  --enable-demuxer=pcm_s16le \
  
  --disable-devices \
  
  --disable-parsers \
  
  --enable-parser=h264 \
  
  --disable-encoders \
  
  --enable-encoder=aac \
  
  --disable-decoders \
  
  --enable-decoder=h264 \
  
  --enable-decoder=pcm_s16le \
  
  --disable-protocols \
  
  --enable-protocol=rtmp \
  
  --disable-filters \
  
  --disable-bsfs

  ---

  This config throws error above (GNU assembler not found, install gas-preprocessor) :

  ./configure \
  
  --cpu=cortex-a8 \
  
  --extra-cflags='-arch armv7 -mios-version-min=7.0 -mthumb' \
  
  --extra-ldflags='-arch armv7 -mios-version-min=7.0' \
  
  --enable-cross-compile \
  
  --arch=armv7 \
  
  --target-os=darwin \
  
  --cc=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang \
  
  --sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk \
  
  --prefix=armv7 \
  
  --disable-doc \
  
  --disable-shared \
  
  --disable-everything \
  
  --enable-static \
  
  --enable-pic \
  
  --disable-muxers \
  
  --enable-muxer=flv \
  
  --disable-demuxers \
  
  --enable-demuxer=h264 \
  
  --enable-demuxer=pcm_s16le \
  
  --disable-devices \
  
  --disable-parsers \
  
  --enable-parser=h264 \
  
  --disable-encoders \
  
  --enable-encoder=aac \
  
  --disable-decoders \
  
  --enable-decoder=h264 \
  
  --enable-decoder=pcm_s16le \
  
  --disable-protocols \
  
  --enable-protocol=rtmp \
  
  --disable-filters \
  
  --disable-bsfs

• What do these FFmpeg APNG encoder prediction methods mean ?

  15 septembre 2021, par Nicke Manarin

  By running ffmpeg -h encoder=apng, I get this :

  


  APNG encoder AVOptions:&#xA;  -dpi               <int>        E..V..... Set image resolution (in dots per inch) (from 0 to 65536) (default 0)&#xA;  -dpm               <int>        E..V..... Set image resolution (in dots per meter) (from 0 to 65536) (default 0)&#xA;  -pred              <int>        E..V..... Prediction method (from 0 to 5) (default none)&#xA;     none                         E..V.....&#xA;     sub                          E..V.....&#xA;     up                           E..V.....&#xA;     avg                          E..V.....&#xA;     paeth                        E..V.....&#xA;     mixed                        E..V.....&#xA;</int></int></int>

  


  What are the differences among these prediction methods specified with -pred ?

  


  I could not find any documentation on ffmpeg.org or anywhere else.

  


• FFMPEG Is it possible dynamically map streams from MPTS ?

  24 juillet 2024, par the_man

  I have a UDP mpegts stream from the DVB app as an input for FFMPEG.
This stream contains multiple services.
I need to map streams to the right service :
For Example my UDP has :

  


   Metadata:
      service_name    : MDR Sachsen HD
      service_provider:
  Stream #0:1[0x65]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, progressive), 1280x720 [SAR 1:1 DAR 16:9], 50 fps, 50 tbr, 90k tbn, 100 tbc
  Stream #0:2[0x66](deu): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, fltp, 192 kb/s
  Stream #0:3[0x67](deu): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, fltp, 192 kb/s (visual impaired) (descriptions)
  Stream #0:4[0x68](deu): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, fltp, 192 kb/s (hearing impaired)
  Stream #0:5[0x69](deu): Subtitle: dvb_teletext ([6][0][0][0] / 0x0006)
  Stream #0:6[0x6a](deu): Audio: ac3 ([6][0][0][0] / 0x0006), 48000 Hz, stereo, fltp, 448 kb/s
  Program 10355
    Metadata:
      service_name    : hr-fernsehen HD
      service_provider:
  Stream #0:9[0xc9]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, progressive), 1280x720 [SAR 1:1 DAR 16:9], 50 fps, 50 tbr, 90k tbn, 100 tbc
  Stream #0:12[0xca](deu): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 192 kb/s
  Stream #0:13[0xcb](deu): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 192 kb/s (visual impaired) (descriptions)
  Stream #0:14[0xcc](deu): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 192 kb/s (hearing impaired)
  Stream #0:10[0xcd](deu): Subtitle: dvb_teletext ([6][0][0][0] / 0x0006), 492x250
  Stream #0:11[0xce](deu): Audio: ac3 ([6][0][0][0] / 0x0006), 48000 Hz, stereo, fltp, 448 kb/s


  


  I need to get Two TV Channels with the right streams each.

  


  I'm using the -map and -program options to compose the right command,
but as it is a mpegts, his streams are changed dynamically, so i will need to restart the command each now and then...
My command so far :

  


  ffmpeg -i "udp://192.168.0.20:1234?fifo_size=10000000&overrun_nonfatal=1" \
-buffer_size 5000k -mpegts_flags +resend_headers -copy_unknown \
-map 0:v:1 -map 0:a:2 \
-map 0:v:9 -map 0:a:12 \
-program program_num=10352:title="MDR Sachsen HD":st=1:st=2 \
-program program_num=10355:title="hr-fernsehen HD":st=9:st=12 \
-c copy -muxrate 31668449 -f mpegts - | dd bs=64k of=/dev/dvb/adapter0/mod0


  


  Big thanks for any hint !