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• clang++ : error : linker command failed with exit code 1 (use -v to see invocation) in cpp with ffmpeg

  6 avril 2020, par Pradeep Simba

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


  



  I saw this link and link2. But, it not done.

  



  My jni folder :

  



  

  



  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 ?

  


• Failed to decode HLS by FFMpeg command. Invalid NAL unit 0

  9 mars 2024, par Fyodor Khruschov

  On front-end I create stream with chrome.tabCapture.capture or navigator.mediaDevices.getDisplayMedia methods. Then send chunks generated by MediaRecorder to server. On the server I have FFMpeg command which decodes chunks into .mp4 file. This is the command :

  


  ffmpeg -y -i - -preset veryfast -tune zerolatency -filter_complex [0:v]split=3[v1][v2][v3];[v1]scale=w=-2:h=1080,fps=30[v1out];[v2]scale=w=-2:h=720,fps=30[v2out];[v3]scale=w=-2:h=480,fps=30[v3out] -map [v1out] -maxrate:0 6M -bufsize:0 12M -keyint_min 100 -g 100 -map [v2out] -maxrate:1 3M -bufsize:1 6M -keyint_min 100 -g 100 -map [v3out] -maxrate:2 1.5M -bufsize:2 3M -keyint_min 100 -g 100 -c:v libx264 -map a:0 -c:a:0 aac -b:a:0 128k -ac 2 -map a:0 -c:a:1 aac -b:a:1 96k -map a:0 -c:a:2 aac -b:a:2 96k -f hls -hls_time 2 -hls_playlist_type vod -hls_flags independent_segments+temp_file -hls_segment_type fmp4 -hls_segment_filename ./output/ready/output_%v_%03d.m4s -var_stream_map v:0,a:0 v:1,a:1 v:2,a:2 -master_pl_name master.m3u8 ./output/ready/stream_%v.m3u8 -map 0:v:0 -map 0:a:0 -c:v copy -c:a aac ./output/download/video.mp4 -map 0:a:0 -ar 16000 -ac 1 -c:a pcm_s16le ./output/captions/audio.wav -loglevel info


  


  During the process of decoding I have these errors in logs :

  


  [extract_extradata @ 0x60000264b250] Invalid NAL unit 0, skipping.
[h264 @ 0x13ff04e60] Invalid NAL unit 0, skipping.
[h264 @ 0x13ff04e60] co located POCs unavailable
[h264 @ 0x13ff04e60] negative number of zero coeffs at 17 0
[h264 @ 0x13ff04e60] error while decoding MB 17 0
[h264 @ 0x13ff04e60] concealing 3388 DC, 3388 AC, 3388 MV errors in B frame
[h264 @ 0x13ff04e60] missing picture in access unit with size 24158
[h264 @ 0x13ff04e60] Invalid NAL unit 0, skipping.
[h264 @ 0x13ff04e60] data partitioning is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
[h264 @ 0x13ff04e60] If you want to help, upload a sample of this file to https://streams.videolan.org/upload/ and contact the ffmpeg-devel mailing list. (ffmpeg-devel@ffmpeg.org)
[h264 @ 0x13ff04e60] no frame!
[h264 @ 0x13ff04e60] Unknown SAR index: 18.
[h264 @ 0x13ff04e60] Invalid NAL unit 0, skipping.
[h264 @ 0x13ff04e60] Unknown SAR index: 18.
[h264 @ 0x13ff04e60] number of reference frames (2+4) exceeds max (5; probably corrupt input), discarding one
[h264 @ 0x13ff04e60] number of reference frames (3+3) exceeds max (5; probably corrupt input), discarding one
[h264 @ 0x13ff04e60] number of reference frames (4+2) exceeds max (5; probably corrupt input), discarding one
[h264 @ 0x13ff04e60] FMO is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
[h264 @ 0x13ff04e60] sps_id 4 out of range


  


  This issue is very inconsistent and happen in rare cases (I can't understand the logic). Most of the time chunks decoded successfully, but sometimes not.

  


  How to understand where the issue is coming from ? Is it possible for FFMpeg to skip wrong data and generate mp4 file anyway even with glitches, but don't crush ?

  


• avformat/bethsoftvid : print error in case the side date failed to be allocated

  27 octobre 2014, par Michael Niedermayer

  avformat/bethsoftvid : print error in case the side date failed to be allocated
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavformat/bethsoftvid.c