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Thread: ffmpeg: libx264 error when using presets

  1. #1
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    Exclamation ffmpeg: libx264 error when using presets

    OS: Ubuntu 10.04 LTS (Lucid Lynx)

    Hi guys,
    I have installed the latest ffmpeg using this tutorial :
    HOWTO: Install and use the latest FFmpeg and x264.

    What ever I do I always get the same error when trying to use ffmpeg with the new presets setting. I've searched forums and google the whole last day and now I'm pretty lost.

    Here is the command I use (I've stripped it down to it's simplest form.):
    Code:
    $ ffmpeg -i ~/Desktop/input.mkv -vcodec libx264 -vpre lossless_slow ~/Desktop/output.mp4
    and this is the error:
    Code:
    [libx264 @ 0xabfec80] constant rate-factor is incompatible with 2pass.
    I'm not doing multi-pass encoding?

    I've tried changing the bitrate, adding -pass 1, bitrate tolerance, quality based etc... I've tried at least 60 different things... reinstall ffmpeg countless times using different tutorials. It's always the same error.

    Thank you for your help.

  2. #2
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    Re: ffmpeg: libx264 error when using presets

    Hi
    There's not enough information there.
    Paste the command and it's output.

  3. #3
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    Re: ffmpeg: libx264 error when using presets

    Sorry about that, i'm new to all this. Here it is:
    Code:
    $ ffmpeg -i ~/Desktop/output.mkv -vcodec libx264 -vpre lossless_slow ~/Desktop/our-final-product.mp4
    ffmpeg version git-N-30186-gd9d5603, Copyright (c) 2000-2011 the FFmpeg developers
      built on May 25 2011 00:12:17 with gcc 4.4.3
      configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-x11grab --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libdc1394 --enable-libfaac --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-avfilter --enable-pthreads --disable-stripping --enable-runtime-cpudetect --enable-swscale
      libavutil    51.  2. 1 / 51.  2. 1
      libavcodec   53.  6. 0 / 53.  6. 0
      libavformat  53.  2. 0 / 53.  2. 0
      libavdevice  53.  0. 0 / 53.  0. 0
      libavfilter   2. 10. 0 /  2. 10. 0
      libswscale    0. 14. 0 /  0. 14. 0
      libpostproc  51.  2. 0 / 51.  2. 0
    [matroska,webm @ 0xa7e8b20] Estimating duration from bitrate, this may be inaccurate
    
    Seems stream 0 codec frame rate differs from container frame rate: 59.94 (2997/50) -> 29.97 (30000/1001)
    Input #0, matroska,webm, from '/home/sekiryou/Desktop/output.mkv':
      Duration: 00:00:30.83, start: 0.000000, bitrate: N/A
        Stream #0.0: Video: h264 (High 4:4:4 Predictive), yuv420p, 1680x1050, PAR 1:1 DAR 8:5, 29.97 tbr, 1k tbn, 59.94 tbc (default)
        Stream #0.1: Audio: pcm_s16le, 44100 Hz, 2 channels, s16, 1411 kb/s (default)
    File '/home/sekiryou/Desktop/our-final-product.mp4' already exists. Overwrite ? [y/N] y
    [buffer @ 0xa7f1040] w:1680 h:1050 pixfmt:yuv420p tb:1/1000000 sar:1/1 sws_param:
    [libx264 @ 0xa7ebc80] --psnr used with psy on: results will be invalid!
    [libx264 @ 0xa7ebc80] --tune psnr should be used if attempting to benchmark psnr!
    [libx264 @ 0xa7ebc80] interlace + weightp is not implemented
    [libx264 @ 0xa7ebc80] using SAR=1/1
    [libx264 @ 0xa7ebc80] using cpu capabilities: MMX2 SSE2Slow SlowCTZ
    [libx264 @ 0xa7ebc80] constant rate-factor is incompatible with 2pass.
    Output #0, mp4, to '/home/sekiryou/Desktop/our-final-product.mp4':
        Stream #0.0: Video: libx264, yuv420p, 1680x1050 [PAR 1:1 DAR 8:5], q=0-69, pass 1, pass 2, 200 kb/s, 90k tbn, 29.97 tbc (default)
        Stream #0.1: Audio: libfaac, 44100 Hz, 2 channels, s16, pass 1, pass 2, 64 kb/s (default)
    Stream mapping:
      Stream #0.0 -> #0.0
      Stream #0.1 -> #0.1
    Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height

  4. #4
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    Re: ffmpeg: libx264 error when using presets

    Hi
    I think that lossless presets are not used for this job.
    Instead of -vpre lossless, use one of x264's presets.
    When you enter x264 -h they are listed:-
    -
    ultrafast,superfast,veryfast,faster,fast,medium,sl ow,slower,veryslow,placebo
    Try them with -crf or -b or whatever.
    Something like this:-
    Code:
    ffmpeg -i ~/Desktop/output.mkv -vcodec libx264 -preset slow -crf 20 ~/Desktop/our-final-product.mp4
    Or this:-
    Code:
    ffmpeg -i ~/Desktop/output.mkv -vcodec libx264 -preset veryslow -b 500k ~/Desktop/our-final-product.mp4
    Last edited by ron999; May 25th, 2011 at 03:58 PM.

  5. #5
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    Re: ffmpeg: libx264 error when using presets

    Quote Originally Posted by ron999 View Post
    Hi
    I think that lossless presets are not used for this job.
    I'm confused about that... Well that's an example I found over Internet. I didn't find any example use in ffmpeg documentation. Do you know any places where they talk about that option?

    Quote Originally Posted by ron999 View Post
    Instead of -vpre lossless, use one of x264's presets.
    When you enter x264 -h they are listed:-
    Ok so if I understand I have to use x264 presets not ffmpeg presets. I didn't noticed that in the ffmpeg man page at first, but you're right, there is a libx264 specific section where they talk about the "-preset" option to be used.

    Man Page:
    VIDEO ENCODERS
    A description of some of the currently available video encoders follows.

    libx264
    H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 format supported through libx264.

    Requires the presence of the libx64 headers and library during configuration. You need to explicitely configure the
    build with "--enable-libx264".

    Options

    preset preset_name
    Set the encoding preset.
    [...]
    Quote Originally Posted by ron999 View Post
    Try them with -crf or -b or whatever.
    Something like this:-
    Code:
    ffmpeg -i ~/Desktop/output.mkv -vcodec libx264 -preset slow -crf 20 ~/Desktop/our-final-product.mp4
    Or this:-
    Code:
    ffmpeg -i ~/Desktop/output.mkv -vcodec libx264 -preset veryslow -b 500k ~/Desktop/our-final-product.mp4
    Done. It worked perfectly, thank you very much for your help ron999.

  6. #6
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    Re: ffmpeg: libx264 error when using presets

    Quote Originally Posted by sekiryou View Post
    Ok so if I understand I have to use x264 presets not ffmpeg presets.
    Hi
    In the folder usr > local > share > ffmpeg the ffmpeg presets are found.
    It's OK to use the -vpre ipod320 and -vpre ipod640 presets.

  7. #7
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    Re: ffmpeg: libx264 error when using presets

    Quote Originally Posted by ron999 View Post
    Hi
    In the folder usr > local > share > ffmpeg the ffmpeg presets are found.
    It's OK to use the -vpre ipod320 and -vpre ipod640 presets.
    Until I understand what they do and in what conditions, I'll stick with x264 presets

    Your help was very useful, thanks again.

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