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  • ffmpeg : Cannot open libx265 encoder. Error initializing output stream 0:0 — Error while opening encoder for output stream #0:0

    16 mai 2018, par bnge

    Sorry for my bad English. I am trying to use ffmpeg to convert some image to heic format. Most of them were succeeded, but some large jpeg (seems only jpeg, png will be okay) files not.

    How can I improve my command to compatible all my images, so I can convert them automatically ?

    ➜  ~ ffmpeg -i sample.jpg -crf 12 -preset placebo -pix_fmt yuv420p -f hevc bitstream.265
    
ffmpeg version 4.0 Copyright (c) 2000-2018 the FFmpeg developers
    
  built with Apple LLVM version 9.1.0 (clang-902.0.39.1)
    
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.0 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma
    
  libavutil      56. 14.100 / 56. 14.100
    
  libavcodec     58. 18.100 / 58. 18.100
    
  libavformat    58. 12.100 / 58. 12.100
    
  libavdevice    58.  3.100 / 58.  3.100
    
  libavfilter     7. 16.100 /  7. 16.100
    
  libavresample   4.  0.  0 /  4.  0.  0
    
  libswscale      5.  1.100 /  5.  1.100
    
  libswresample   3.  1.100 /  3.  1.100
    
  libpostproc    55.  1.100 / 55.  1.100
    
Input #0, image2, from 'sample.jpg':
    
  Duration: 00:00:00.04, start: 0.000000, bitrate: 5226869 kb/s
    
    Stream #0:0: Video: mjpeg, yuvj444p(pc, bt470bg/unknown/unknown), 13333x4200, 25 tbr, 25 tbn, 25 tbc
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mjpeg (native) -> hevc (libx265))
    
Press [q] to stop, [?] for help
    
[swscaler @ 0x7fd2e3006000] deprecated pixel format used, make sure you did set range correctly
    
x265 [info]: HEVC encoder version 2.7
    
x265 [info]: build info [Mac OS X][clang 9.0.0][64 bit] 8bit+10bit+12bit
    
x265 [info]: using cpu capabilities: MMX2 SSE2Fast LZCNT SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
    
x265 [error]: Picture width must be an integer multiple of the specified chroma subsampling
    
[libx265 @ 0x7fd2e2802a00] Cannot open libx265 encoder.
    
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
    
Conversion failed!

  • Ffmpeg concatenate video file with hw acceleration using cuvid

    9 mars 2023, par Jack Kwakman

    I am trying to use Nvidia hardware acceleration for FFmpeg using cuvid. I want to merge multiple h264 / mp4 files using a complex filter (simplified example) :

    



    ffmpeg -hwaccel cuvid -c:v h264_cuvid -i input.ts -y -fflags +genpts -filter_complex "[0:v:0][0:a:0]concat=n=1:v=1:a=1[outv][outa]" -map "[outv]" -map "[outa]" output.mp4


    



    I use the following version FFmpeg and Ubuntu 16.04 :

    



    version 3.4.2-1~16.04.york0.2 Copyright (c) 2000-2018 the FFmpeg developers built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.9) 20160609


    



    If i run the command i get the following error :

    



    Impossible to convert between the formats supported by the filter 'Parsed_concat_0' and the filter 'auto_scaler_0'
Error reinitializing filters!
Failed to inject frame into filter network: Function not implemented


    



    When i remove the hwaccel flag the command runs but i get a massive CPU load. How can i use a concat complex_filter in combination with cuvid hw acceleration ?

    



    SOLUTION

    



    The concat demuxing worked. The output of the encoder is now in h264. I group the files in a list.txt :

    



    file '/path/to/file1'
file '/path/to/file2'
file '/path/to/file3'


    



    Then run ffmpeg :

    



    ffmpeg -y -f concat -safe 0 -i list.txt -c copy result.mp4


    


  • ffmpeg - duration usage in input text file

    12 mai 2018, par Voicu

    I am trying to use ffmpeg to concatenate video segments with some black screen. To do that I’ve first generated a blank 10-second video (no audio track) with :

    $ ffmpeg -f lavfi -i color=black:s=320x240:r=1 -f lavfi -i anullsrc -t 10 -vcodec libvpx -an blank.mkv

    I then created the simplest possible scenario within input.txt file (contents below) in order to have three seconds of black screen followed by some video (no audio track) :

    file 'blank.mkv'
    
duration 3
    
file 'video_example.mkv'

    And, finally, ran the following ffmpeg command to concat the contents of that input file :

    $ ffmpeg -f concat -i input.txt -codec:v copy -codec:a copy output.mkv

    The issue that I have is that the duration 3 is not considered, so the final video still has ten seconds of black frames (instead of three) followed by my video. And also "Non-monotonous DTS in output stream 0:0 ..." message is shown when using duration x in the file. If I remove duration the warnings are gone and getting the 10-second black screen first output as well.

    Full output of the ffmpeg concat command :

    $ ffmpeg -hide_banner -f concat -i input.txt -codec:v copy -codec:a copy output.mkv
    
Input #0, concat, from 'input.txt':
    
  Duration: N/A, start: 0.000000, bitrate: N/A
    
    Stream #0:0: Video: vp8, yuv420p(progressive), 320x240, SAR 1:1 DAR 4:3, 1 fps, 1 tbr, 1k tbn, 1k tbc
    
    Metadata:
    
      ENCODER         : Lavc57.107.100 libvpx
    
      DURATION        : 00:00:10.000000000
    
File 'output.mkv' already exists. Overwrite ? [y/N] y
    
Output #0, matroska, to 'output.mkv':
    
  Metadata:
    
    encoder         : Lavf57.83.100
    
    Stream #0:0: Video: vp8 (VP80 / 0x30385056), yuv420p(progressive), 320x240 [SAR 1:1 DAR 4:3], q=2-31, 1 fps, 1 tbr, 1k tbn, 1k tbc
    
    Metadata:
    
      ENCODER         : Lavc57.107.100 libvpx
    
      DURATION        : 00:00:10.000000000
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (copy)
    
Press [q] to stop, [?] for help
    
[concat @ 000000000031a440] DTS 3000 < 9000 out of order
    
[matroska @ 0000000000328420] Non-monotonous DTS in output stream 0:0; previous: 9000, current: 3000; changing to 9000. This may result in incorrect timestamps in the output file.
    
[matroska @ 0000000000328420] Non-monotonous DTS in output stream 0:0; previous: 9000, current: 4001; changing to 9000. This may result in incorrect timestamps in the output file.
    
[matroska @ 0000000000328420] Non-monotonous DTS in output stream 0:0; previous: 9000, current: 4998; changing to 9000. This may result in incorrect timestamps in the output file.
    
[matroska @ 0000000000328420] Non-monotonous DTS in output stream 0:0; previous: 9000, current: 6004; changing to 9000. This may result in incorrect timestamps in the output file.
    
[matroska @ 0000000000328420] Non-monotonous DTS in output stream 0:0; previous: 9000, current: 7002; changing to 9000. This may result in incorrect timestamps in the output file.
    
[matroska @ 0000000000328420] Non-monotonous DTS in output stream 0:0; previous: 9000, current: 8005; changing to 9000. This may result in incorrect timestamps in the output file.
    
frame= 5794 fps=0.0 q=-1.0 Lsize=    7109kB time=01:37:09.70 bitrate=  10.0kbits/s speed=5.16e+004x
    
video:7043kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.926229%

    Any idea what am I doing wrong ? The warning seems to hint towards the issue here.

    Other possibly useful info :

    $ ffprobe -hide_banner blank.mkv
    
Input #0, matroska,webm, from 'blank.mkv':
    
  Metadata:
    
    ENCODER         : Lavf57.83.100
    
  Duration: 00:00:10.00, start: 0.000000, bitrate: 1 kb/s
    
    Stream #0:0: Video: vp8, yuv420p(progressive), 320x240, SAR 1:1 DAR 4:3, 1 fps, 1 tbr, 1k tbn, 1k tbc (default)
    
    Metadata:
    
      ENCODER         : Lavc57.107.100 libvpx
    
      DURATION        : 00:00:10.000000000
    

    
$ ffprobe -hide_banner video_example.mkv
    
Input #0, matroska,webm, from 'video_example.mkv':
    
  Metadata:
    
    encoder         : GStreamer matroskamux version 1.8.1.1
    
    creation_time   : 2018-05-04T17:57:04.000000Z
    
  Duration: 01:37:08.70, start: 15434.269000, bitrate: 9 kb/s
    
    Stream #0:0(eng): Video: vp8, yuv420p(progressive), 320x240, SAR 1:1 DAR 4:3, 1 fps, 1 tbr, 1k tbn, 1k tbc (default)
    
    Metadata:
    
      title           : Video
    

    
$ ffmpeg -v
    
ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
    
  built with gcc 7.3.0 (GCC)

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