Newest 'libx264' Questions - Stack Overflow

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• ffmpeg video has no preview/thumbnail with codec H.265

  5 octobre 2023, par Eva Silviana

  I have videos with large file size. I want to reduce the file size and I found this answer https://unix.stackexchange.com/a/38380/587749

  ffmpeg -i input.mp4 -c:v libx265 output.mp4
  

  It works perfectly, my video file size becomes smaller. But, my problem is that the video doesn't have a preview when I want to send it to WhatsApp.

  Am I missing some additional settings? Because, there are no problems when using video codec libx264

  The image below is an example:

  Red area is video file with Codec H.265 and green area is video file with Codec H.264 (as you can see, you can play videos directly on WhatsApp)

  

• broken ffmpeg default settings detected

  4 octobre 2023, par Ramakrishna

  I am getting broken ffmpeg error while VideoWrite using X264 Fourcc codec.I have install all the dependencies.How can I rectify this problem.The sample code that I have been using is as follows.

  VideoWriter oVideoWriter ("path.mp4", CV_FOURCC('X','2','6','4'), 15, frameSize, false);
  

  Operating system : Ubuntu 14.04 64-bit

  Console Error:

  [libx264 @ 0x8d6220] broken ffmpeg default settings detected
  [libx264 @ 0x8d6220] use an encoding preset (e.g. -vpre medium)
  [libx264 @ 0x8d6220] preset usage: -vpre  -vpre 
  [libx264 @ 0x8d6220] speed presets are listed in x264 --help
  [libx264 @ 0x8d6220] profile is optional; x264 defaults to high
  Could not open codec 'libx264': Unspecified errorOpenCV Error: Unsupported format or combination of formats (Your version of Gstreamer doesn't support this codec acutally or needed plugin missing.) in CvVideoWriter_GStreamer::open, file /home/mbox140/Development/opencv-2.4.9/modules/highgui/src/cap_gstreamer.cpp, line 518
  terminate called after throwing an instance of 'cv::Exception'
    what():  /home/mbox140/Development/opencv-2.4.9/modules/highgui/src/cap_gstreamer.cpp:518: error: (-210) Your version of Gstreamer doesn't support this codec acutally or needed plugin missing. in function CvVideoWriter_GStreamer::open
  

  Suggest me any solution for this.

• FFMPEG (libx264) "height not divisible by 2" [closed]

  3 octobre 2023, par Andy Hin

  I am trying to encode a .mp4 video from a set of frames using FFMPEG using the libx264 codec.

  This is the command I am running:

  /usr/local/bin/ffmpeg -r 24 -i frame_%05d.jpg -vcodec libx264 -y -an video.mp4
  

  I sometimes get the following error:

  [libx264 @ 0xa3b85a0] height not divisible by 2 (520x369)
  

  After searching around a bit it seems that the issue has something to do with the scaling algorithm and can be fixed by adding a -vf argument.

  However, in my case I don't want to do any scaling. Ideally, I want to keep the dimensions exactly the same as the frames. Any advice? Is there some sort of aspect ratio that h264 enforces?

• FFmpeg : Audio is sped up after compressing AVI video [closed]

  21 août 2023, par Karen S

  I have an AVI video and I want to reduce the file size. When I run the FFmpeg command below, the resulting audio in the video is sped up, and the last bit of the video has no audio.

  The FFmpeg command

  ffmpeg -i "in.avi" -vcodec libx264 -acodec copy -crf 26 -vf "scale=-1:'min(720,ih)', yadif=1" out.avi
  

  The output messages

  ffmpeg version 2023-06-11-git-09621fd7d9-full_build-www.gyan.dev Copyright (c) 2000-2023 the FFmpeg developers
    built with gcc 12.2.0 (Rev10, Built by MSYS2 project)
    configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
    libavutil      58. 13.100 / 58. 13.100
    libavcodec     60. 17.100 / 60. 17.100
    libavformat    60.  6.100 / 60.  6.100
    libavdevice    60.  2.100 / 60.  2.100
    libavfilter     9.  8.101 /  9.  8.101
    libswscale      7.  3.100 /  7.  3.100
    libswresample   4. 11.100 /  4. 11.100
    libpostproc    57.  2.100 / 57.  2.100
  [avi @ 000002255f70d540] Switching to NI mode, due to poor interleaving
  Input #0, avi, from 'in.avi':
    Duration: 00:10:40.64, start: 0.000000, bitrate: 28852 kb/s
    Stream #0:0: Video: dvvideo, yuv411p, 720x480 [SAR 32:27 DAR 16:9], 25000 kb/s, SAR 8:9 DAR 4:3, 60k fps, 29.97 tbr, 60k tbn
    Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
    Stream #0:2: Audio: pcm_s16le, 32000 Hz, stereo, s16, 1024 kb/s
  Stream mapping:
    Stream #0:0 -> #0:0 (dvvideo (native) -> h264 (libx264))
    Stream #0:1 -> #0:1 (copy)
  Press [q] to stop, [?] for help
  [libx264 @ 000002255fbc4940] using SAR=8/9
  [libx264 @ 000002255fbc4940] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  [libx264 @ 000002255fbc4940] profile High 4:2:2, level 3.1, 4:2:2, 8-bit
  Output #0, avi, to 'out.avi':
    Metadata:
      ISFT            : Lavf60.6.100
    Stream #0:0: Video: h264 (H264 / 0x34363248), yuv422p(tv, progressive), 720x480 [SAR 8:9 DAR 4:3], q=2-31, 59.94 fps, 59.94 tbn
      Metadata:
        encoder         : Lavc60.17.100 libx264
      Side data:
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
    Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s16, 1536 kb/s
  [dvvideo @ 000002255fb36d80] Concealing bitstream errors.33 bitrate=2437.5kbits/s speed=0.902x
      Last message repeated 15 times
  [dvvideo @ 000002255fb36d80] Concealing bitstream errors.77 bitrate=2439.5kbits/s speed=0.902x
      Last message repeated 60 times
  [dvvideo @ 0000022560071680] Concealing bitstream errors.72 bitrate=2461.8kbits/s speed=0.895x
      Last message repeated 18 times
  [dvvideo @ 0000022560071680] Concealing bitstream errors.12 bitrate=2459.9kbits/s speed=0.894x
  [out#0/avi @ 000002255f70d8c0] video:110055kB audio:80088kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.724923%
  frame=38400 fps= 57 q=-1.0 Lsize=  191521kB time=00:10:40.60 bitrate=2449.2kbits/s speed=0.946x
  [libx264 @ 000002255fbc4940] frame I:165   Avg QP:27.36  size: 37180
  [libx264 @ 000002255fbc4940] frame P:9710  Avg QP:30.58  size:  7328
  [libx264 @ 000002255fbc4940] frame B:28525 Avg QP:35.24  size:  1241
  [libx264 @ 000002255fbc4940] consecutive B-frames:  0.8%  0.3%  0.3% 98.6%
  [libx264 @ 000002255fbc4940] mb I  I16..4: 10.3% 67.6% 22.1%
  [libx264 @ 000002255fbc4940] mb P  I16..4:  1.0%  3.8%  0.8%  P16..4: 40.7% 12.1%  8.6%  0.0%  0.0%    skip:33.0%
  [libx264 @ 000002255fbc4940] mb B  I16..4:  0.1%  0.2%  0.0%  B16..8: 36.9%  1.8%  0.4%  direct: 1.4%  skip:59.1%  L0:45.0% L1:51.8% BI: 3.1%
  [libx264 @ 000002255fbc4940] 8x8 transform intra:66.5% inter:68.7%
  [libx264 @ 000002255fbc4940] coded y,uvDC,uvAC intra: 60.3% 64.7% 10.1% inter: 10.7% 6.9% 0.1%
  [libx264 @ 000002255fbc4940] i16 v,h,dc,p: 21% 35% 10% 34%
  [libx264 @ 000002255fbc4940] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 11% 23% 19%  6%  8%  7% 12%  6%  9%
  [libx264 @ 000002255fbc4940] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 13% 25% 16%  6% 10%  7% 12%  5%  6%
  [libx264 @ 000002255fbc4940] i8c dc,h,v,p: 58% 19% 18%  5%
  [libx264 @ 000002255fbc4940] Weighted P-Frames: Y:3.0% UV:1.5%
  [libx264 @ 000002255fbc4940] ref P L0: 56.9% 16.8% 19.3%  6.7%  0.2%
  [libx264 @ 000002255fbc4940] ref B L0: 87.5% 10.4%  2.2%
  [libx264 @ 000002255fbc4940] ref B L1: 93.2%  6.8%
  [libx264 @ 000002255fbc4940] kb/s:1407.29
  

  Since the audio stream is being copied I don't understand why the resulting audio sounds sped up. The video looks fine, it's just the audio that is the issue.

  I've tried other options too, such as converting the audio to aac or mp3 and the resulting audio still sounds sped up and high pitched.

  Does anyone know why the audio isn't simply being copied the way it sounds in the original AVI video and do you have any suggestions for how to fix the issue?

• asm SIMD sniffer

  1er août 2023, par Андрей Тернити

  There is x264. It use a lot of x86 asm files. For example pixel-32.asm. This files can use different SIMD instruction set: mmx, 3DNow!, sse family, others

  I need the simple way to automatically analyze every file. I want get which SIMD family in which file are used. How?

  I think every asm file must contain information about which SIMD family it use (or information that no SIMD). Without this information it is very bad idea try to use this files...
  I am angry, my x86 CPU support mmx and 3DNow! only, but x264 try call sse, so I get "Illegal instruction" sometimes. I plan to make patch for x264.

  P.S. If you can make issues in official repo let me know.

  P.P.S. This thread on Doom9 (mirror).