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• ffmpeg : problems playing video on android

  25 novembre 2020, par Jonathan García

  (Translated) Hello ! I have the following problem. I concatenate multiple ts files and convert to mp4 with ffmpeg. I do this operation multiple times in an automated way, so I don't always check the results, but whenever I do, on the computer, the result obtained is as expected. However, some videos, when played on an Android device, are seen incorrectly in any application : Chrome, Firefox, Vlc, etc. The version of ffmpeg I use is the latest. This is the command I use :

  


  ffmpeg.exe -hwaccel dxva2 -y -f concat -i list.txt -acodec copy -vcodec copy output.mp4 -preset normal

  


  Results :

  


  PC

  


  Android

  


  This is the output of ffmpeg :

  


  ffmpeg version n4.3.1-26-gca55240b8c Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9.3-win32 (GCC) 20200320
  configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --disable-w32threads --enable-pthreads --enable-iconv --enable-zlib --enable-libxml2 --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-opencl --enable-libvmaf --disable-vulkan --enable-libvorbis --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable-libdavs2 --enable-ffnvcodec --enable-cuda-llvm --disable-libglslang --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvpx --enable-libwebp --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-librubberband --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libtwolame --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libzimg --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-ldflags=-pthread --extra-libs=-lgomp
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Trailing option(s) found in the command: may be ignored.
Input #0, concat, from 'list.txt':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Data: timed_id3 (ID3  / 0x20334449)
    Stream #0:1: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(tv, unknown/bt470bg/unknown, progressive), 320x568, 29.50 fps, 29.50 tbr, 90k tbn, 180k tbc
    Stream #0:2: Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, mono, fltp, 64 kb/s
Output #0, mp4, to 'output.mp4':
  Metadata:
    encoder         : Lavf58.45.100
    Stream #0:0: Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, unknown/bt470bg/unknown, progressive), 320x568, q=2-31, 29.50 fps, 29.50 tbr, 90k tbn, 90k tbc
    Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 64 kb/s
Stream mapping:
  Stream #0:1 -> #0:0 (copy)
  Stream #0:2 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 9504 fps=8330 q=-1.0 Lsize=   24561kB time=00:07:42.26 bitrate= 435.3kbits/s speed= 405x
video:21200kB audio:3100kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.073735%


  


  Not all videos are "yuv420p (tv, unknown / bt470bg / unknown, progressive)", but this should not be the problem, since other videos with this information are seen correctly on Android.

  


  To correct this type of video I do the following :

  


  ffmpeg -y -f concat -i list.txt -c:v libx264 -preset slow -crf 22 -pix_fmt yuv420p -c:a aac -b:a 128k output.mp4

  


  So I get the video to play correctly both on pc and Android. Unfortunately, automating the process by always using this last line occasionally causes problems (starting file 40MB, ending file> 1GB, more than 2 hours)

  


  I would like, if possible, help me identify which videos will be viewed incorrectly on Android. Thank you very much in advance. Finally, this is the answer that ffmpeg gives when executing the line with which I fix the file :

  


  ffmpeg version n4.3.1-26-gca55240b8c Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9.3-win32 (GCC) 20200320
  configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --disable-w32threads --enable-pthreads --enable-iconv --enable-zlib --enable-libxml2 --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-opencl --enable-libvmaf --disable-vulkan --enable-libvorbis --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable-libdavs2 --enable-ffnvcodec --enable-cuda-llvm --disable-libglslang --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvpx --enable-libwebp --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-librubberband --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libtwolame --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libzimg --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-ldflags=-pthread --extra-libs=-lgomp
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, concat, from 'list.txt':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Data: timed_id3 (ID3  / 0x20334449)
    Stream #0:1: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(tv, unknown/bt470bg/unknown, progressive), 320x568, 29.50 fps, 29.50 tbr, 90k tbn, 180k tbc
    Stream #0:2: Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, mono, fltp, 64 kb/s
Stream mapping:
  Stream #0:1 -> #0:0 (h264 (native) -> h264 (libx264))
  Stream #0:2 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 000001efdbaee540] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 000001efdbaee540] profile High, level 3.0, 4:2:0, 8-bit
[libx264 @ 000001efdbaee540] 264 - core 161 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=1 ref=5 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=8 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=2 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=crf mbtree=1 crf=22.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'd.mp4':
  Metadata:
    encoder         : Lavf58.45.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 320x568, q=-1--1, 29.50 fps, 15104 tbn, 29.50 tbc
    Metadata:
      encoder         : Lavc58.91.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
    Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 128 kb/s
    Metadata:
      encoder         : Lavc58.91.100 aac
More than 1000 frames duplicated    8960kB time=00:02:06.74 bitrate= 579.1kbits/s dup=999 drop=0 speed=15.7x
frame=13638 fps=468 q=-1.0 Lsize=   32033kB time=00:07:42.20 bitrate= 567.8kbits/s dup=4134 drop=0 speed=15.9x
video:25547kB audio:5995kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.557852%
[libx264 @ 000001efdbaee540] frame I:87    Avg QP:19.17  size: 12750
[libx264 @ 000001efdbaee540] frame P:4630  Avg QP:21.89  size:  4286
[libx264 @ 000001efdbaee540] frame B:8921  Avg QP:23.89  size:   583
[libx264 @ 000001efdbaee540] consecutive B-frames:  8.9%  8.6%  9.1% 73.4%
[libx264 @ 000001efdbaee540] mb I  I16..4: 12.2% 76.2% 11.6%
[libx264 @ 000001efdbaee540] mb P  I16..4:  3.7% 11.0%  0.8%  P16..4: 37.1% 16.2%  5.7%  0.0%  0.0%    skip:25.4%
[libx264 @ 000001efdbaee540] mb B  I16..4:  0.3%  0.9%  0.1%  B16..8: 30.4%  3.1%  0.3%  direct: 0.8%  skip:64.2%  L0:51.4% L1:44.3% BI: 4.3%
[libx264 @ 000001efdbaee540] 8x8 transform intra:71.2% inter:66.8%
[libx264 @ 000001efdbaee540] direct mvs  spatial:99.9% temporal:0.1%
[libx264 @ 000001efdbaee540] coded y,uvDC,uvAC intra: 52.5% 42.1% 5.5% inter: 9.7% 9.0% 0.3%
[libx264 @ 000001efdbaee540] i16 v,h,dc,p: 19% 21%  9% 50%
[libx264 @ 000001efdbaee540] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 11% 13%  6%  9% 11%  9% 11%  8%
[libx264 @ 000001efdbaee540] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23%  9%  8%  6% 14% 14% 11%  9%  6%
[libx264 @ 000001efdbaee540] i8c dc,h,v,p: 46% 20% 23% 12%
[libx264 @ 000001efdbaee540] Weighted P-Frames: Y:2.9% UV:0.8%
[libx264 @ 000001efdbaee540] ref P L0: 72.3% 12.2% 11.3%  2.1%  1.9%  0.2%  0.0%
[libx264 @ 000001efdbaee540] ref B L0: 93.1%  5.5%  1.1%  0.3%
[libx264 @ 000001efdbaee540] ref B L1: 97.6%  2.4%
[libx264 @ 000001efdbaee540] kb/s:452.67
[aac @ 000001efdbaee9c0] Qavg: 10682.834


  


• Linker error by trying example program with ffmpeg

  11 mars, par Chris

  I think this might be a stupid question and I'm just blind but that thing is driving me nuts for hours now.
I downloaded ffmpeg and build it. Now I want to try the thing out in a program but I can't setup cmake to link ffmpeg properly and have no idea what is wrong.

  


  The linker always tells me this :

  


  christoph@christoph-ThinkPad-T490:~/develop/ffmpg_example/build$ make
[ 50%] Linking CXX executable test
CMakeFiles/test.dir/main.cxx.o: In function `main':
main.cxx:(.text+0x180): undefined reference to `av_register_all()'
main.cxx:(.text+0x1a7): undefined reference to `avformat_open_input(AVFormatContext**, char const*, AVInputFormat*, AVDictionary**)'
main.cxx:(.text+0x1ce): undefined reference to `avformat_find_stream_info(AVFormatContext*, AVDictionary**)'
main.cxx:(.text+0x206): undefined reference to `av_dump_format(AVFormatContext*, int, char const*, int)'
main.cxx:(.text+0x2bb): undefined reference to `avcodec_find_decoder(AVCodecID)'
main.cxx:(.text+0x2fc): undefined reference to `avcodec_alloc_context3(AVCodec const*)'
main.cxx:(.text+0x316): undefined reference to `avcodec_copy_context(AVCodecContext*, AVCodecContext const*)'
main.cxx:(.text+0x361): undefined reference to `avcodec_open2(AVCodecContext*, AVCodec const*, AVDictionary**)'
main.cxx:(.text+0x377): undefined reference to `av_frame_alloc()'
main.cxx:(.text+0x383): undefined reference to `av_frame_alloc()'
main.cxx:(.text+0x3ba): undefined reference to `avpicture_get_size(AVPixelFormat, int, int)'
main.cxx:(.text+0x3d0): undefined reference to `av_malloc(unsigned long)'
main.cxx:(.text+0x3ff): undefined reference to `avpicture_fill(AVPicture*, unsigned char const*, AVPixelFormat, int, int)'
main.cxx:(.text+0x43d): undefined reference to `sws_getContext(int, int, AVPixelFormat, int, int, AVPixelFormat, int, SwsFilter*, SwsFilter*, double const*)'
main.cxx:(.text+0x465): undefined reference to `av_read_frame(AVFormatContext*, AVPacket*)'
main.cxx:(.text+0x49f): undefined reference to `avcodec_decode_video2(AVCodecContext*, AVFrame*, int*, AVPacket const*)'
main.cxx:(.text+0x4fd): undefined reference to `sws_scale(SwsContext*, unsigned char const* const*, int const*, int, int, unsigned char* const*, int const*)'
main.cxx:(.text+0x545): undefined reference to `av_free_packet(AVPacket*)'
main.cxx:(.text+0x556): undefined reference to `av_free(void*)'
main.cxx:(.text+0x565): undefined reference to `av_frame_free(AVFrame**)'
main.cxx:(.text+0x574): undefined reference to `av_frame_free(AVFrame**)'
main.cxx:(.text+0x580): undefined reference to `avcodec_close(AVCodecContext*)'
main.cxx:(.text+0x58f): undefined reference to `avcodec_close(AVCodecContext*)'
main.cxx:(.text+0x59e): undefined reference to `avformat_close_input(AVFormatContext**)'
collect2: error: ld returned 1 exit status
CMakeFiles/test.dir/build.make:87: recipe for target 'test' failed
make[2]: *** [test] Error 1
CMakeFiles/Makefile2:75: recipe for target 'CMakeFiles/test.dir/all' failed
make[1]: *** [CMakeFiles/test.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2


  


  The cmake list looks like this :

  


  cmake_minimum_required(VERSION 3.16)

project(ffmpeg_test)

add_library(avformat STATIC IMPORTED)
set_target_properties(avformat
    PROPERTIES IMPORTED_LOCATION /home/christoph/develop/FFmpeg/build/lib/libavformat.a
)
add_library(avcodec STATIC IMPORTED)
set_target_properties(avcodec
    PROPERTIES IMPORTED_LOCATION /home/christoph/develop/FFmpeg/build/lib/libavcodec.a
)
add_library(swscale STATIC IMPORTED)
set_target_properties(swscale
    PROPERTIES IMPORTED_LOCATION /home/christoph/develop/FFmpeg/build/lib/libswscale.a
)
add_library(avutil STATIC IMPORTED)
set_target_properties(avutil
    PROPERTIES IMPORTED_LOCATION /home/christoph/develop/FFmpeg/build/lib/libavutil.a
)
add_executable(test main.cxx)

target_link_libraries(test PRIVATE
    /home/christoph/develop/FFmpeg/build/lib/libavformat.a
    avcodec
    swscale
    avutil
)
target_include_directories(test PRIVATE /home/christoph/develop/FFmpeg/build/include)


  


  And here are the ffmpeg libs :

  


  christoph@christoph-ThinkPad-T490:~/develop/FFmpeg/build/lib$ ll
total 277840
drwxr-xr-x  3 christoph christoph      4096 Dez  7 23:59 ./
drwxr-xr-x 17 christoph christoph      4096 Dez  7 23:59 ../
-rw-r--r--  1 christoph christoph 173479270 Dez  7 23:59 libavcodec.a
-rw-r--r--  1 christoph christoph   2174910 Dez  7 23:59 libavdevice.a
-rw-r--r--  1 christoph christoph  37992438 Dez  7 23:59 libavfilter.a
-rw-r--r--  1 christoph christoph  59222040 Dez  7 23:59 libavformat.a
-rw-r--r--  1 christoph christoph   4759514 Dez  7 23:59 libavutil.a
-rw-r--r--  1 christoph christoph    695698 Dez  7 23:59 libswresample.a
-rw-r--r--  1 christoph christoph   6164398 Dez  7 23:59 libswscale.a
drwxr-xr-x  2 christoph christoph      4096 Dez  7 23:59 pkgconfig/


  


  And this is the example code :

  


  #include&#xA;&#xA;#include <libavcodec></libavcodec>avcodec.h>&#xA;#include <libavformat></libavformat>avformat.h>&#xA;#include <libswscale></libswscale>swscale.h>&#xA;&#xA;// compatibility with newer API&#xA;#if LIBAVCODEC_VERSION_INT &lt; AV_VERSION_INT(55,28,1)&#xA;#define av_frame_alloc avcodec_alloc_frame&#xA;#define av_frame_free avcodec_free_frame&#xA;#endif&#xA;&#xA;void SaveFrame(AVFrame *pFrame, int width, int height, int iFrame) {&#xA;  FILE *pFile;&#xA;  char szFilename[32];&#xA;  int  y;&#xA;  &#xA;  // Open file&#xA;  sprintf(szFilename, "frame%d.ppm", iFrame);&#xA;  pFile=fopen(szFilename, "wb");&#xA;  if(pFile==NULL)&#xA;    return;&#xA;  &#xA;  // Write header&#xA;  fprintf(pFile, "P6\n%d %d\n255\n", width, height);&#xA;  &#xA;  // Write pixel data&#xA;  for(y=0; ydata[0]&#x2B;y*pFrame->linesize[0], 1, width*3, pFile);&#xA;  &#xA;  // Close file&#xA;  fclose(pFile);&#xA;}&#xA;&#xA;int main(int argc, char *argv[]) {&#xA;  // Initalizing these to NULL prevents segfaults!&#xA;  AVFormatContext   *pFormatCtx = NULL;&#xA;  int               i, videoStream;&#xA;  AVCodecContext    *pCodecCtxOrig = NULL;&#xA;  AVCodecContext    *pCodecCtx = NULL;&#xA;  AVCodec           *pCodec = NULL;&#xA;  AVFrame           *pFrame = NULL;&#xA;  AVFrame           *pFrameRGB = NULL;&#xA;  AVPacket          packet;&#xA;  int               frameFinished;&#xA;  int               numBytes;&#xA;  uint8_t           *buffer = NULL;&#xA;  struct SwsContext *sws_ctx = NULL;&#xA;&#xA;  if(argc &lt; 2) {&#xA;    printf("Please provide a movie file\n");&#xA;    return -1;&#xA;  }&#xA;  // Register all formats and codecs&#xA;  av_register_all();&#xA;  &#xA;  // Open video file&#xA;  if(avformat_open_input(&amp;pFormatCtx, argv[1], NULL, NULL)!=0)&#xA;    return -1; // Couldn&#x27;t open file&#xA;  &#xA;  // Retrieve stream information&#xA;  if(avformat_find_stream_info(pFormatCtx, NULL)&lt;0)&#xA;    return -1; // Couldn&#x27;t find stream information&#xA;  &#xA;  // Dump information about file onto standard error&#xA;  av_dump_format(pFormatCtx, 0, argv[1], 0);&#xA;  &#xA;  // Find the first video stream&#xA;  videoStream=-1;&#xA;  for(i=0; inb_streams; i&#x2B;&#x2B;)&#xA;    if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO) {&#xA;      videoStream=i;&#xA;      break;&#xA;    }&#xA;  if(videoStream==-1)&#xA;    return -1; // Didn&#x27;t find a video stream&#xA;  &#xA;  // Get a pointer to the codec context for the video stream&#xA;  pCodecCtxOrig=pFormatCtx->streams[videoStream]->codec;&#xA;  // Find the decoder for the video stream&#xA;  pCodec=avcodec_find_decoder(pCodecCtxOrig->codec_id);&#xA;  if(pCodec==NULL) {&#xA;    fprintf(stderr, "Unsupported codec!\n");&#xA;    return -1; // Codec not found&#xA;  }&#xA;  // Copy context&#xA;  pCodecCtx = avcodec_alloc_context3(pCodec);&#xA;  if(avcodec_copy_context(pCodecCtx, pCodecCtxOrig) != 0) {&#xA;    fprintf(stderr, "Couldn&#x27;t copy codec context");&#xA;    return -1; // Error copying codec context&#xA;  }&#xA;&#xA;  // Open codec&#xA;  if(avcodec_open2(pCodecCtx, pCodec, NULL)&lt;0)&#xA;    return -1; // Could not open codec&#xA;  &#xA;  // Allocate video frame&#xA;  pFrame=av_frame_alloc();&#xA;  &#xA;  // Allocate an AVFrame structure&#xA;  pFrameRGB=av_frame_alloc();&#xA;  if(pFrameRGB==NULL)&#xA;    return -1;&#xA;&#xA;  // Determine required buffer size and allocate buffer&#xA;  numBytes=avpicture_get_size(AV_PIX_FMT_RGB24, pCodecCtx->width,&#xA;                  pCodecCtx->height);&#xA;  buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t));&#xA;  &#xA;  // Assign appropriate parts of buffer to image planes in pFrameRGB&#xA;  // Note that pFrameRGB is an AVFrame, but AVFrame is a superset&#xA;  // of AVPicture&#xA;  avpicture_fill((AVPicture *)pFrameRGB, buffer, AV_PIX_FMT_RGB24,&#xA;         pCodecCtx->width, pCodecCtx->height);&#xA;  &#xA;  // initialize SWS context for software scaling&#xA;  sws_ctx = sws_getContext(pCodecCtx->width,&#xA;               pCodecCtx->height,&#xA;               pCodecCtx->pix_fmt,&#xA;               pCodecCtx->width,&#xA;               pCodecCtx->height,&#xA;               AV_PIX_FMT_RGB24,&#xA;               SWS_BILINEAR,&#xA;               NULL,&#xA;               NULL,&#xA;               NULL&#xA;               );&#xA;&#xA;  // Read frames and save first five frames to disk&#xA;  i=0;&#xA;  while(av_read_frame(pFormatCtx, &amp;packet)>=0) {&#xA;    // Is this a packet from the video stream?&#xA;    if(packet.stream_index==videoStream) {&#xA;      // Decode video frame&#xA;      avcodec_decode_video2(pCodecCtx, pFrame, &amp;frameFinished, &amp;packet);&#xA;      &#xA;      // Did we get a video frame?&#xA;      if(frameFinished) {&#xA;    // Convert the image from its native format to RGB&#xA;    sws_scale(sws_ctx, (uint8_t const * const *)pFrame->data,&#xA;          pFrame->linesize, 0, pCodecCtx->height,&#xA;          pFrameRGB->data, pFrameRGB->linesize);&#xA;    &#xA;    // Save the frame to disk&#xA;    if(&#x2B;&#x2B;i&lt;=5)&#xA;      SaveFrame(pFrameRGB, pCodecCtx->width, pCodecCtx->height, &#xA;            i);&#xA;      }&#xA;    }&#xA;    &#xA;    // Free the packet that was allocated by av_read_frame&#xA;    av_free_packet(&amp;packet);&#xA;  }&#xA;  &#xA;  // Free the RGB image&#xA;  av_free(buffer);&#xA;  av_frame_free(&amp;pFrameRGB);&#xA;  &#xA;  // Free the YUV frame&#xA;  av_frame_free(&amp;pFrame);&#xA;  &#xA;  // Close the codecs&#xA;  avcodec_close(pCodecCtx);&#xA;  avcodec_close(pCodecCtxOrig);&#xA;&#xA;  // Close the video file&#xA;  avformat_close_input(&amp;pFormatCtx);&#xA;  &#xA;  return 0;&#xA;}&#xA;

  


• ffmpeg windows - combine multiple videos in folder and subfolders into one video [closed]

  21 décembre 2020, par Kirill

  I have Xiaomi security camera which is saving videos with length of 3 sec.
So I have such structure of my full day capture :
Folder with name of date, for example 20201221, that contains subfolders with hours (00 ; 01 ; 02 ; ... ; 23 ;), each of these folders contains subfolders with minutes (00 ; 01 ; ... ; 59 ;), each of them contains 20 mp4 video files with 3 seconds duration.
I need to generate one mp4 video of whole day with help of ffmpeg and windows 10 command line.
Can someone help me to do these ?
Thank you !