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• Encode video with H.264 using FFmpeg in Windows

  4 novembre 2019, par cbuchart

  I’m trying to encode a video with H.264 using FFmpeg (AV_CODEC_ID_H264), but I’m unable to init the codec correctly. No issues at all when using other codec like AV_CODEC_ID_MPEG1VIDEO.

  avcodec_register_all();
  
  
  
  auto codec = avcodec_find_encoder(AV_CODEC_ID_H264);
  
  if (!codec) { return false; }
  
  
  
  auto codec_context = avcodec_alloc_context3(codec);
  
  if (!codec_context) { return false; }
  
  
  
  codec_context->codec_id = codec->id;
  
  codec_context->codec_type = AVMEDIA_TYPE_VIDEO;
  
  
  
  codec_context->width = w; // w = 1280 on tests
  
  codec_context->height = h; // h = 1024 on tests
  
  codec_context->bit_rate = w * h * 4;
  
  
  
  codec_context->time_base = { 1, fps }; // fps = 50 on tests
  
  codec_context->framerate = { fps, 1 };
  
  
  
  codec_context->gop_size = 10;
  
  
  
  codec_context->pix_fmt = AV_PIX_FMT_YUV420P;
  
  
  
  if (codec->id == AV_CODEC_ID_H264) {
  
      av_opt_set(codec_context->priv_data, "preset", "veryfast", 0);
  
  }
  
  
  
  if (avcodec_open2(codec_context, codec, nullptr) < 0) { return false; } // < Fails here

  The first error message I received is :

  [h264_amf @ 08e75900] DLL amfrt32.dll failed to open

  As far as I was able to find, that DLL belongs to the Advanced Media Framework, a SDK to access HW acceleration from AMD hardware. I don’t own an AMD card, so I don’t have such drivers nor SDK installed in my computer. Anyway, I downloaded the SDK and copied driver’s DLLs to my binaries directory. The missing DLL error was removed, but, as expected, the module was not correctly initialized :

  [h264_amf @ 0375b600] CreateComponent(AMFVideoEncoderVCE_AVC) failed with error 13

  Question : Am I missing anything (parameters, dependencies) ? Is there any way to disable the AMF acceleration or to mark it as optional / auto-detect / whatever ?

  PS : I’m expecting to run the encoding executable in a very heterogeneous client-base, assuming Windows 10 and barely anything else, so I can’t mark as mandatory vendor-specific accelerations.

  PS : I’m using the pre-compiled LGPL build of FFmpeg 4.2.1 from https://ffmpeg.zeranoe.com/builds/ for Windows 32 bits. My code is being compiled using Visual Studio 2017.

  If the problem is in the pre-compiled version, I’m happy with re-building it. If so, which configuration parameters should I use when building x264 or ffmpeg then ?

• Is there a way to pick up a file based on the date modified in batchfile or direct cmd : Windows

  10 octobre 2019, par A Person

  My goal is to be able to pick up files based on the date modified. The files has same name with the ending string being different as it has date and time stamp on the file. I’m trying to either use that value or use the actual date modified/created value to pick up the correct file.

  my script so far picks up every video file from one folder and find its matching audio channels and merges them together in ffmpeg. However sometimes there are multiple version of that file. i want to be able to pick up the new file and use that in the transcoding.

  My Research : (Tried these methods and tried to adapt but was not able to)

  https://askubuntu.com/questions/61179/find-the-latest-file-by-modified-date

  Batch file to copy the newest file created (not modified)

  Example of file names.

  BA_MUS_006615Highc450277201903201834100272.m2v
  This can have a pair with the beginning being same just the ending different. BA_MUS_006615Highc450 this part remains same with the identifier being Highc450 and the file name changing. the file name is BA_MUS_006615 this string can change unless it a new version of same file where only the date portion and time change. 277201903201834100272. Date starts after 227 the one above is shown as 20190320 and time is 183410.

  This time reflects to actual time of the date modified tab in windows and is slight off by a minute or two as the time is stamped when the file enters the software not exiting.

  Is there any help i can get on this. If you require more information please let me know.

  The code i am using to match the file is using a software called RoboTask, where is like a programming but with GUI. Then the file calls cmd to run the ffmpeg and then exits cmd to go back to picking the next file.

  Thanks.

  EDIT

  Goal : Be able to find a file that matches the exact same name for example

  BA_MUS_006615

  then when it picks up all the files that has the same name - it find the file which is the newest and assigns that to a variable.

  The code i am currently using is one made by Ben Personick (https://stackoverflow.com/users/3985011/ben-personick) which is Finding File Matches & Variable Assignment using a .BAT Script

• ffmpeg for windows : error when concatenating videos

  20 août 2019, par Ginso

  i have extracted a few clips from a video file of resolution 1920x816 called ca0.mp4...ca9.mp4 using the command

  ffmpeg -i ./ca.mkv -ss 00:53:24 -t 00:01:30 ca0.mp4

  Then i created a black video using

  ffmpeg -f lavfi -i color=black:s=1920x816:r=24000/1001 -f lavfi -i anullsrc -ar 48000 -ac 2 -t 00:00:02 empty.mp4

  now i want to concencate the clips with the black video between them. Therefore i created a file list.txt :

  file 'ca0.mp4'
  
  file 'empty.mp4'
  
  file 'ca1.mp4'
  
  file 'empty.mp4'
  
  file 'ca2.mp4'
  
  file 'empty.mp4'
  
  file 'ca3.mp4'
  
  file 'empty.mp4'
  
  file 'ca4.mp4'
  
  file 'empty.mp4'
  
  file 'ca5.mp4'
  
  file 'empty.mp4'
  
  file 'ca6.mp4'
  
  file 'empty.mp4'
  
  file 'ca7.mp4'
  
  file 'empty.mp4'
  
  file 'ca8.mp4'
  
  file 'empty.mp4'
  
  file 'ca9.mp4'

  and tried the command

  ffmpeg -f concat -i list.txt -c:v qtrle -c:a copy ca.mp4

  however, i get the following output :

  ffmpeg version N-89940-gb1af0e23a3 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libmfx --enable-amf --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth
  
    libavutil      56.  7.100 / 56.  7.100
  
    libavcodec     58.  9.100 / 58.  9.100
  
    libavformat    58.  7.100 / 58.  7.100
  
    libavdevice    58.  0.101 / 58.  0.101
  
    libavfilter     7. 11.101 /  7. 11.101
  
    libswscale      5.  0.101 /  5.  0.101
  
    libswresample   3.  0.101 /  3.  0.101
  
    libpostproc    55.  0.100 / 55.  0.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 000001e2cd155900] Auto-inserting h264_mp4toannexb bitstream filter
  
  Guessed Channel Layout for Input Stream #0.1 : 5.1
  
  Input #0, concat, from 'list.txt':
  
    Duration: N/A, start: -0.021333, bitrate: 1894 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x816 [SAR 1:1 DAR 40:17], 1500 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(ger): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 394 kb/s
  
      Metadata:
  
        handler_name    : SoundHandler
  
      Stream #0:2(eng): Data: bin_data (text / 0x74786574), 0 kb/s
  
      Metadata:
  
        handler_name    : SubtitleHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> qtrle (native))
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  [mp4 @ 000001e2cd213080] Could not find tag for codec qtrle in stream #0, codec not currently supported in container
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
  
  Error initializing output stream 0:0 --
  
  Conversion failed!

  can anyone tell me, what i did wrong ?