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• Only using 1 core when I converting video to tiff sequnce file

  20 août 2019, par gsk

  My workspace spec :

  • CPU : Ryzen 1950x
  • GPU : GTX 1080Ti
  • RAM : 128GB
  • SSD : 512GB samsung 960pro
  • OS : window10

  When I convert to tiff sequence file from my video(3min/mp4) CPU only used 1 core with 28 frame per sec.
  If I delete -pix_fmt rgb48le option can used more core and speed up(50 frame per sec).
  but, I need changing color space for making dcp...

  I already tried -threads option (0,1,2,16,32,64...) but still used 1 core.
  and found about GPU acceleration from other forum but I think tiff codec can’t use CUDA.

  ./ffmpeg -i test.mp4 -q:v 1 -aspect 1.85 -s 1988:1080 -an -pix_fmt rgb48le -src_range 1 -dst_range 1 -r 24 \test%010d.tiff

  tiff codec don’t support multi core ?
  if don’t support multi core how can I increase speed for encoding.
  thank you.

• Audio stuttering every couple of seconds

  27 juin 2019, par Glutch

  I’m merging a video (recorded with ffmpeg, good quality, all solid), with a musicfile.mp3. However every couple of seconds the music stutters and skips slightly. Which seems very strange since simply adding music on top of a video sounds like the engine could relax and take its time, creating no artifacts. (In comparison to recording live desktop footage). Can anyone help me sort this out ?

  System : MacOS MBP 2015, 16gb ram 2.7ghz i5

  ffmpeg -i "temp/1561246948349.mkv" -i "music/happy.mp3" -vcodec copy -filter_complex amix -map 0:v -map 0:a -map 1:a -shortest -b:a 144k "finished/2019-06-22/1561246948349/output.mkv"
  
  ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.3_1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-11.0.2.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-11.0.2.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
  
    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
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  3.100 /  5.  3.100
  
    libswresample   3.  3.100 /  3.  3.100
  
    libpostproc    55.  3.100 / 55.  3.100
  
  Input #0, matroska,webm, from 'temp/1561246948349.mkv':
  
    Metadata:
  
      ENCODER         : Lavf58.20.100
  
    Duration: 00:00:21.50, start: 0.000000, bitrate: 5834 kb/s
  
      Stream #0:0: Video: h264 (High 4:4:4 Predictive), yuv422p(progressive), 2880x1800, 30 fps, 30 tbr, 1k tbn, 2000k tbc (default)
  
      Metadata:
  
        ENCODER         : Lavc58.35.100 libx264
  
        DURATION        : 00:00:21.467000000
  
      Stream #0:1: Audio: vorbis, 44100 Hz, stereo, fltp (default)
  
      Metadata:
  
        ENCODER         : Lavc58.35.100 libvorbis
  
        DURATION        : 00:00:21.496000000
  
  Input #1, mp3, from 'music/happy.mp3':
  
    Metadata:
  
      album           : Random
  
      genre           : Jazz & Blues
  
    Duration: 00:15:59.84, start: 0.025057, bitrate: 186 kb/s
  
      Stream #1:0: Audio: mp3, 44100 Hz, stereo, fltp, 186 kb/s
  
      Metadata:
  
        encoder         : LAME3.100
  
  Stream mapping:
  
    Stream #0:1 (vorbis) -> amix:input0
  
    Stream #1:0 (mp3float) -> amix:input1
  
    amix -> Stream #0:0 (libvorbis)
  
    Stream #0:0 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  Output #0, matroska, to 'finished/2019-06-22/1561246948349/output.mkv':
  
    Metadata:
  
      encoder         : Lavf58.20.100
  
      Stream #0:0: Audio: vorbis (libvorbis) (oV[0][0] / 0x566F), 44100 Hz, stereo, fltp, 144 kb/s (default)
  
      Metadata:
  
        encoder         : Lavc58.35.100 libvorbis
  
      Stream #0:1: Video: h264 (High 4:4:4 Predictive) (H264 / 0x34363248), yuv422p(progressive), 2880x1800, q=2-31, 30 fps, 30 tbr, 1k tbn, 1k tbc (default)
  
      Metadata:
  
        ENCODER         : Lavc58.35.100 libx264
  
        DURATION        : 00:00:21.467000000
  
  frame=  640 fps=0.0 q=-1.0 Lsize=   15227kB time=00:00:21.46 bitrate=5810.3kbits/s speed=33.8x    
  
  video:14888kB audio:318kB subtitle:0kB other streams:0kB global headers:4kB muxing overhead: 0.139864%

• clang++ : error : linker command failed with exit code 1 (use -v to see invocation) [duplicate]

  1er avril 2020, par Pradeep Simba

  When I build ndk with ffmpeg it occurs error.

  



  

  



  Android.mk file

  



  LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_C_INCLUDES += ./include
LOCAL_MODULE     := native-lib
LOCAL_CFLAGS := -DSTDC_HEADERS -std=c99
LOCAL_CFLAGS := -Wno-pointer-sign
LOCAL_ARM_MODE := arm
APP_OPTIM := release
LOCAL_SRC_FILES  := \
./native-lib.cpp
LOCAL_LDLIBS := -llog
include $(BUILD_SHARED_LIBRARY)


  



  native-lib.cpp file

  



  #include &#xA;#include <string>&#xA;&#xA;extern "C"&#xA;{&#xA;#include "libavcodec/avcodec.h"&#xA;#include "libavformat/avformat.h"&#xA;#include "libavutil/opt.h"&#xA;}&#xA;&#xA;extern "C" JNIEXPORT jstring JNICALL&#xA;Java_com_example_m_MainActivity_stringFromJNI(&#xA;    JNIEnv* env,&#xA;    jobject /* this */) {&#xA;std::string hello = "Hello from C&#x2B;&#x2B;";&#xA;av_register_all();&#xA;return env->NewStringUTF(hello.c_str());&#xA;}&#xA;</string>

  



  When I build ndk this error occurs.

  



  

  



  D:\Github\n>ndk-build
Android NDK: APP_PLATFORM not set. Defaulting to minimum supported version android-16.
[arm64-v8a] Compile++      : native-lib <= native-lib.cpp
[arm64-v8a] SharedLibrary  : libnative-lib.so
./obj/local/arm64-v8a/objs/native-lib/./libmp3lame/native-lib.o: In function `Java_com_example_m_MainActivity_stringFromJNI':
D:\Github\n/jni/./libmp3lame/native-lib.cpp:16: undefined reference to `av_register_all'
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [D:/install/sdk/ndk/21.0.6113669/build//../build/core/build-binary.mk:725: obj/local/arm64-v8a/libnative-lib.so] Error 1

D:\Github\n>ndk-build -v
GNU Make 4.2.1
Built for x86_64-w64-mingw32
Copyright (C) 1988-2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later /gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

D:\Github\n>


  



  why it comes like this native-lib.cpp:16: undefined reference av_register_all ?

  



  I added all the required libs in my jni folder . but, why this error and this native-lib.cpp:16 : undefined reference av_register_all comes ?

  



  How can I solve this ?