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• FFmpeg raw video size parameter

  3 novembre 2019, par Yanick Salzmann

  I am using libavformat in my library to read a stream of raw i420 images and transform them into an mp4 video. I’ve found CLI commands that perform this but since I am using the library in my program I need to reconstruct the same thing.

  Currently the code that is having a problem is looking like this :

          const auto raw_format = av_find_input_format("rawvideo");
  
          if (raw_format == nullptr) {
  
              log->error("Could not find RAW input parser in FFmpeg");
  
              throw std::runtime_error("RAW not found");
  
          }
  
  
  
          _format_context->pb = _io_context.get();
  
  
  
          AVDictionary *input_options = nullptr;
  
          av_dict_set(&input_options, "framerate", std::to_string(fps).c_str(), 0);
  
          av_dict_set(&input_options, "pix_fmt", "yuv420p", 0);
  
          av_dict_set(&input_options, "s:v", fmt::format("{}x{}", width, height).c_str(), 0);
  
          av_dict_set(&input_options, "size", fmt::format("{}x{}", width, height).c_str(), 0);
  
  
  
          auto formatPtr = _format_context.get();
  
          auto res = avformat_open_input(&formatPtr, "(memory file)", raw_format, &input_options);

  Finding the rawvideo is no problem, but it fails in avformat_open_input with the error : [2019-11-03 15:03:22.953] [11599:11663] [ffmpeg] [error] Picture size 0x0 is invalid

  I assumed the sizes are something I can insert using the input options, since in the CLI version it is passed using -s:v 1920x1080, however this does not seem to be true.

  Where do I have to specify the dimensions of my raw input stream ?

• How to concatenate two or more videos with same width and different height in FFMpeg and to maintain the same aspect ratio ?

  25 octobre 2019, par Aarwil

  I have five video parts to concat all. Each five videos are in the same width and height. The second part is the hstack of another 2 videos and the third part is the hstack and vstack of another 3 videos. While concat all the five video parts the aspect ratio is not maintaining in the final video. Since I am new to ffmpeg help me to sort out the problem

  I have tried with the command in my final with filter complex and to reduce the size I used frame per second.

  "ffmpeg -i
final.mp4 -vf scale=1280:480 -filter:v fps=fps=30 finalNew.mp4"

  but nothing worked.
  Also help me to use hstack with scaling, to maintain the aspect ratio for the second part on below command

  Command : ffmpeg -i vid1.mkv -i vid2.mkv -filter_complex "[0:v]scale=-1:480[v0] ;[0:v][1:v]hstack=inputs=2"vid3.mkv

  Images

  second part

  third part

  videochunks

  I have console the info of my video

  ffmpeg -i part1.mkv -i part2.mkv -i part3.mkv -i part4.mkv -i part5.mkv
ffmpeg version N-94911-g197985c5bf Copyright (c) 2000-2019 the FFmpeg developers
 built with gcc 9.1.1 (GCC) 20190807
 configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --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-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
 libavutil      56. 35.100 / 56. 35.100
 libavcodec     58. 56.101 / 58. 56.101
 libavformat    58. 32.104 / 58. 32.104
 libavdevice    58.  9.100 / 58.  9.100
 libavfilter     7. 58.102 /  7. 58.102
 libswscale      5.  6.100 /  5.  6.100
 libswresample   3.  6.100 /  3.  6.100
 libpostproc    55.  6.100 / 55.  6.100
Input #0, matroska,webm, from 'part1.mkv':
 Metadata:
   ENCODER         : Lavf58.32.104
 Duration: 00:00:44.00, start: 0.000000, bitrate: 189 kb/s
   Stream #0:0(eng): Video: h264 (High), yuv420p(progressive), 640x480 [SAR 9:16 DAR 3:4], 30 fps, 30 tbr, 1k tbn, 60 tbc (default)
   Metadata:
     title           : Video
     ENCODER         : Lavc58.56.101 libx264
     DURATION        : 00:00:44.000000000
Input #1, matroska,webm, from 'part2.mkv':
 Metadata:
   ENCODER         : Lavf58.32.104
 Duration: 00:01:22.07, start: 0.000000, bitrate: 113 kb/s
   Stream #1:0: Video: h264 (High), yuv420p(progressive), 640x240 [SAR 9:16 DAR 3:2], 30 fps, 30 tbr, 1k tbn, 60 tbc (default)
   Metadata:
     ENCODER         : Lavc58.56.101 libx264
     DURATION        : 00:01:22.066000000
Input #2, matroska,webm, from 'part3.mkv':
 Metadata:
   ENCODER         : Lavf58.32.104
 Duration: 00:00:42.03, start: 0.000000, bitrate: 405 kb/s
   Stream #2:0: Video: h264 (High), yuv420p(progressive), 640x720 [SAR 9:16 DAR 1:2], 30 fps, 30 tbr, 1k tbn, 60 tbc (default)
   Metadata:
     ENCODER         : Lavc58.56.101 libx264
     DURATION        : 00:00:42.033000000
Input #3, matroska,webm, from 'part4.mkv':
 Metadata:
   ENCODER         : Lavf58.32.104
 Duration: 00:00:21.00, start: 0.000000, bitrate: 298 kb/s
   Stream #3:0: Video: h264 (High), yuv420p(progressive), 640x240 [SAR 9:16 DAR 3:2], 30 fps, 30 tbr, 1k tbn, 60 tbc (default)
   Metadata:
     ENCODER         : Lavc58.56.101 libx264
     DURATION        : 00:00:21.000000000
Input #4, matroska,webm, from 'part5.mkv':
 Metadata:
   ENCODER         : Lavf58.32.104
 Duration: 00:00:16.00, start: 0.000000, bitrate: 169 kb/s
   Stream #4:0(eng): Video: h264 (High), yuv420p(progressive), 640x480 [SAR 9:16 DAR 3:4], 30 fps, 30 tbr, 1k tbn, 60 tbc (default)
   Metadata:
     title           : Video
     ENCODER         : Lavc58.56.101 libx264
     DURATION        : 00:00:16.000000000

• using ffmpeg.js to play H265 video, only play hvc1 format, can't play hev1 format, is there anyway to play hev1 ?

  1er novembre 2019, par Alex

  I compiled ffmpeg into ffmpeg.js and ffmpeg.wasm by using emscripten, so that it can run in the browser and play H265 video.

  However, I found that only the hvc1 format can be played.
  Like that：

  Stream #0:0(und): Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, bt709, progressive), 1280x720, 854 kb/s, 25 fps, 25 tbr, 12800 tbn, 25 tbc (default)

  and the hev1 format cannot be played.Like that :

  Stream #0:0(und): Video: hevc (Main) (hev1 / 0x31766568), yuv420p(tv, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 829 kb/s, 25 fps, 25 tbr, 12800 tbn, 25 tbc (default)

  Web browser’s Console has this errors

  libffmpeg.js:1 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x644b80] reached eof, corrupted CTTS atom
  
   >put_char @ libffmpeg.js:1
  
   >write @ libffmpeg.js:1
  
   >write @ libffmpeg.js:1
  
   >doWritev @ libffmpeg.js:1
  
   >___syscall146 @ libffmpeg.js:1
  
   >(anonymous) @ wasm-009a4202-743:1
  
   >(anonymous) @ wasm-009a4202-739:1
  
   >(anonymous) @ wasm-009a4202-741:1
  
   >(anonymous) @ wasm-009a4202-742:1
  
   >(anonymous) @ wasm-009a4202-437:1
  
   >(anonymous) @ wasm-009a4202-2083:1
  
   >(anonymous) @ wasm-009a4202-87:1
  
   >(anonymous) @ wasm-009a4202-923:1
  
   >(anonymous) @ wasm-009a4202-247:1
  
   >(anonymous) @ wasm-009a4202-247:1
  
   >(anonymous) @ wasm-009a4202-247:1
  
   >(anonymous) @ wasm-009a4202-247:1
  
   >(anonymous) @ wasm-009a4202-2864:1
  
   >(anonymous) @ wasm-009a4202-247:1
  
   >(anonymous) @ wasm-009a4202-3015:1
  
   >(anonymous) @ wasm-009a4202-247:1
  
   >(anonymous) @ wasm-009a4202-1073:1
  
   >(anonymous) @ wasm-009a4202-2261:1
  
   >(anonymous) @ wasm-009a4202-2562:1
  
   >(anonymous) @ libffmpeg.js:1
  
   >Decoder.openDecoder @ decoder.js:48
  
   >Decoder.processReq @ decoder.js:165
  
   >self.onmessage @ decoder.js:248
  
  libffmpeg.js:1 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x644b80] error reading header
  
   >put_char @ libffmpeg.js:1
  
   >write @ libffmpeg.js:1
  
   >write @ libffmpeg.js:1
  
   >doWritev @ libffmpeg.js:1
  
   >___syscall146 @ libffmpeg.js:1
  
   >(anonymous) @ wasm-009a4202-743:1
  
   >(anonymous) @ wasm-009a4202-739:1
  
   >(anonymous) @ wasm-009a4202-741:1
  
   >(anonymous) @ wasm-009a4202-742:1
  
   >(anonymous) @ wasm-009a4202-437:1
  
   >(anonymous) @ wasm-009a4202-2083:1
  
   >(anonymous) @ wasm-009a4202-87:1
  
   >(anonymous) @ wasm-009a4202-1073:1
  
   >(anonymous) @ wasm-009a4202-2261:1
  
   >(anonymous) @ wasm-009a4202-2562:1
  
   >(anonymous) @ libffmpeg.js:1
  
   >Decoder.openDecoder @ decoder.js:48
  
   >Decoder.processReq @ decoder.js:165
  
   >self.onmessage @ decoder.js:248
  
  common.js:58 [2019-11-1 18:23:25:529][Decoder][IF] openDecoder return 8

  ffplay can play these two, why can only play hvc1 after compiling into ffmpeg.js and ffmpeg.wasm ?