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• How to solve video is choppy when scrolling on android browser ?

  18 septembre 2024, par SiLeafClover

  I am currently doing video scrolly kind of things. I'm using GSAP and Scrolltrigger and sveltekit to play video on scroll. At the beginning of the implementation, the video is very laggy on scroll on all browsers and cross devices.

  


  So I do some research and found out video encoding is so important and found this ffmpeg command through codepen. ffmpeg -i originalVideo.mp4 -movflags faststart -vcodec libx264 -crf 23 -g 1 -pix_fmt yuv420p output.mp4
  
When I use the video which is exported by the above command, it works smoothly on windows, mac and ios. But I'm still having issues with my phone (Andriod). When I check the website on my phone(Android), the video is laggy/choppy on scroll but on ios, the video is fine. So may I know which options do I need to add for the video encoding to play the video smoothly on Android ?

  


• converting eac3 to aac with ffmpeg

  30 novembre 2023, par vespino

  I have a number of video files stored on my Synology of which the audio doesn't play on when opening them with DS File. This is because DS File does not support eac3. I would like to convert those files to aac using ffmpeg, but when doing so, all audio is lost.

  


  This is the file info :

  


  Input #0, matroska,webm, from &#x27;<file>.mkv&#x27;:&#xA;  Metadata:&#xA;    encoder         : libebml v1.4.2 &#x2B; libmatroska v1.6.4&#xA;  Duration: 00:48:43.42, start: 0.000000, bitrate: 6566 kb/s&#xA;    Stream #0:0: Video: h264 (High), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)&#xA;    Stream #0:1(eng): Audio: eac3, 48000 Hz, 5.1 (default)&#xA;    Stream #0:2(eng): Subtitle: subrip&#xA;    Metadata:&#xA;      title           : English [SDH]&#xA;    Stream #0:3(ara): Subtitle: subrip&#xA;    Metadata:&#xA;      title           : Arabic&#xA;    Stream #0:4(chi): Subtitle: subrip&#xA;</file>

  


  This is my attempt :

  


  ffmpeg -i <file>.mkv -map 0:v -map 0:a:0 -map 0:s -c copy -c:a aac -b:a 640k output.mkv&#xA;</file>

  


  Subtitles are kept, but audio is completely removed. I would like to automate the process if possible.

  


  This is my ffmpeg configuration :

  


  ffmpeg version 4.1.8 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 8.5.0 (GCC)
  configuration: --prefix=/usr --incdir='${prefix}/include/ffmpeg' --arch=i686 --target-os=linux --cross-prefix=/usr/local/x86_64-pc-linux-gnu/bin/x86_64-pc-linux-gnu- --enable-cross-compile --enable-optimizations --enable-pic --enable-gpl --enable-shared --disable-static --disable-stripping --enable-version3 --enable-encoders --enable-pthreads --disable-protocols --disable-protocol=rtp --enable-protocol=file --enable-protocol=pipe --disable-muxer=image2 --disable-muxer=image2pipe --disable-swscale-alpha --disable-ffplay --disable-ffprobe --disable-doc --disable-devices --disable-bzlib --disable-altivec --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libmp3lame --disable-vaapi --disable-cuvid --disable-nvenc --disable-decoder=aac --disable-decoder=aac_fixed --disable-encoder=aac --disable-decoder=amrnb --disable-decoder=ac3 --disable-decoder=ac3_fixed --disable-encoder=zmbv --disable-encoder=dca --disable-decoder=dca --disable-encoder=ac3 --disable-encoder=ac3_fixed --disable-encoder=eac3 --disable-decoder=eac3 --disable-encoder=truehd --disable-decoder=truehd --disable-encoder=hevc_vaapi --disable-decoder=hevc --disable-muxer=hevc --disable-demuxer=hevc --disable-parser=hevc --disable-bsf=hevc_mp4toannexb --x86asmexe=yasm --cc=/usr/local/x86_64-pc-linux-gnu/bin/x86_64-pc-linux-gnu-wrap-gcc --enable-yasm --enable-libx264 --enable-encoder=libx264
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100


  


  Synology does not support eac3 out of the box. So is this even possible ?

  


• crtbegin_static.o file missing for android toolchain (when complie ffmepg)

  7 juin 2013, par Jason Tsai

  I'm using android-ndk-r8d-windows and cygwin, and I'm trying to compile ffmpeg on android.
  I get stuck and the log file says "e :/ffmpeg/jni/temp/ffconf.6zOhxLrc.o
  arm-linux-androideabi-gcc.exe : error : /cygdrive/e/android-ndk-r8e/platforms/android-9/arch-arm/usr/lib/crtbegin_static.o : No such file or directory
  "

  anyway, I checked, the file is definitely here. I've done some reasearch and find the similiar mistake exsists after the r6 version of ndk.
  Then I tried Samveen's advice, add the code

  $ cd src && ln -s ndk/platforms/android-9/arch-arm/usr/lib/crtbegin_static.o   

  However, the cygwin told me "-bash : cd : src : No such file or directory"

  I'm new on this. Could anyone help me ??

  After I deleted the code

  ${NDK_ROOT}/platforms/${PLATFORM}/arch-arm/usr/lib/crtbegin_static.o
  
  ${NDK_ROOT}/platforms/${PLATFORM}/arch-arm/usr/lib/crtend_android.o -lc -lm -ldl

  I got an config.h... AND now my config.sh file is

  export TMPDIR="E:/ffmpeg/jni/temp"
  
  PREBUILT=$ndk/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows
  
  PLATFORM=$ndk/platforms/android-8/arch-arm
  
  ./configure --target-os=linux \
  
      --arch=arm \
  
     --enable-version3 \
  
     --enable-gpl \
  
     --enable-nonfree \
  
     --disable-doc \
  
     --disable-stripping \
  
     --disable-ffmpeg \
  
     --disable-ffplay \
  
     --disable-ffprobe \
  
     --disable-encoders \
  
     --disable-muxers \
  
     --disable-devices \
  
     --disable-protocols \
  
     --enable-protocol=file \
  
     --enable-avfilter \
  
     --enable-network \
  
     --disable-avdevice \
  
     --enable-cross-compile \
  
     --cc=$PREBUILT/bin/arm-linux-androideabi-gcc \
  
     --cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
  
     --nm=$PREBUILT/bin/arm-linux-androideabi-nm \
  
     --extra-cflags="-fPIC -DANDROID" \
  
     --disable-asm \
  
     --enable-neon \
  
     --enable-armv5te \
  
     --extra-ldflags='-L$PLATFORM/usr/lib -nostdlib' \

  and the log file says :

  WARNING: /cygdrive/e/android-ndk-r8d/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/arm-linux-androideabi-pkg-config not found, library detection may fail.
  
      mktemp -u XXXXXX
  
      Fli1cP
  
      check_ld cc
  
      check_cc
  
      BEGIN e:/ffmpeg/jni/temp/ffconf.mPVUbOKZ.c
  
          1   int main(void){ return 0; }
  
      END e:/ffmpeg/jni/temp/ffconf.mPVUbOKZ.c
  
      /cygdrive/e/android-ndk-r8d/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/arm-linux-androideabi-gcc -fPIC -DANDROID -std=c99 -c -o e:/ffmpeg/jni/temp/ffconf.HKTTQJKC.o e:/ffmpeg/jni/temp/ffconf.mPVUbOKZ.c
  
      /cygdrive/e/android-ndk-r8d/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/arm-linux-androideabi-gcc -Wl,-rpath-link=/cygdrive/e/android-ndk-r8d/platforms/android-9/arch-arm/usr/lib -L/cygdrive/e/android-ndk-r8d/platforms/android-9/arch-arm/usr/lib -nostdlib /cygdrive/e/android-ndk-r8d/platforms/android-9/arch-arm/usr/lib/crtbegin_static.o /cygdrive/e/android-ndk-r8d/platforms/android-9/arch-arm/usr/lib/crtend_android.o -lc -lm -ldl -o e:/ffmpeg/jni/temp/ffconf.qymN2G2k e:/ffmpeg/jni/temp/ffconf.HKTTQJKC.o
  
      arm-linux-androideabi-gcc.exe: /cygdrive/e/android-ndk-r8d/platforms/android-9/arch-arm/usr/lib/crtbegin_static.o: No such file or directory
  
      arm-linux-androideabi-gcc.exe: /cygdrive/e/android-ndk-r8d/platforms/android-9/arch-arm/usr/lib/crtend_android.o: No such file or directory
  
      C compiler test failed.