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Thread: HOWTO: Install and use the latest FFmpeg and x264

  1. #31
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    Re: HOWTO: Compile the latest ffmpeg and x264 from source

    mtune and march as native just means gcc uses the best available for your specific cpu - your native setup.
    He that will not reason is a bigot; he that cannot reason is a fool; he that dares not reason is a slave.

  2. #32
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    Re: HOWTO: Compile the latest ffmpeg and x264 from source

    Quote Originally Posted by FakeOutdoorsman View Post
    I can confirm this error. I'm getting the same error but haven't found a reason or solution yet.
    Well im not even sure what im missing out on haha. I know very little about encoding videos (actually, i know just about all i want to heh ).

  3. #33
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    Re: HOWTO: Compile the latest ffmpeg and x264 from source

    Quote Originally Posted by Nullack View Post
    mtune and march as native just means gcc uses the best available for your specific cpu - your native setup.
    How do you think gcc knows that, or even knows what cpu I have? If I had compiled gcc and tailored it to my own system, then it would know whatever I told it about that, and if I told it correctly, then it would know my cpu. I didn't actually compile my gcc -- it came with my distribution, and it knows I have an AMD 64-bit processor, but it doesn't know which one. I have to tell it, if I want optimal results.

    I don't find any documentation of "-march=native" in "info gcc".

  4. #34
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    Re: HOWTO: Compile the latest ffmpeg and x264 from source

    Have a look on the web, native is the optimal setting when your compiled binaries dont need to be run on anything else than your machine.
    He that will not reason is a bigot; he that cannot reason is a fool; he that dares not reason is a slave.

  5. #35
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    Re: HOWTO: Compile the latest ffmpeg and x264 from source

    Quote Originally Posted by Nullack View Post
    Have a look on the web, native is the optimal setting when your compiled binaries dont need to be run on anything else than your machine.
    I did look. I learn that "-march=native" was introduced in gcc 4.2. I have only gcc 4.1.2 here, so it's no good to me personally, until I update. Still, very interesting.
    http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=448370

  6. #36
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    Re: HOWTO: Compile the latest ffmpeg and x264 from source

    Im on gcc 4.3.1 and have no problems with it. Mplayer now use mtune and march as native in mplayer / mencoder builds. Its super fast, much faster than VLC, Totem etcetc
    He that will not reason is a bigot; he that cannot reason is a fool; he that dares not reason is a slave.

  7. #37
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    Re: HOWTO: Compile the latest ffmpeg and x264 from source

    FFmpeg does not support "-threads auto" as an option anymore. If your command or script gives you the following error when using "-threads auto", then use "-threads 0" (the integer zero, not a letter) instead:
    Code:
    Expected number for threads but found: auto
    I'm unsure when this change was introduced.

    Update from S. Sabatini on ffmpeg-user mailing list:
    -threads auto never worked as you expected, "auto" was previously parsed by atoi() which returned "0", now it omplains if it can't recognize the argument as a number.
    Last edited by FakeOutdoorsman; July 13th, 2008 at 10:01 PM.

  8. #38
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    Re: HOWTO: Compile the latest ffmpeg and x264 from source

    Quote Originally Posted by Leefmc View Post
    *edit3*
    Yea, seems it is a rate control equation. Not knowing encoding at all, how important is this? If i use the command "ffmpeg -rc_eq" i get the same error, so im guessing that specific command is corrupted or something? I compared an older videos size to the newly "no rc_eq" encoded one, and they seem to be the same size and quality, though i have not tested on quicktime yet (thats a bit of a pain when you dont have windows heh).

    Thoughts?
    Looks like you found a bug in ffmpeg. I submitted this to the ffmpeg-user mailing list. You can follow it here:
    rc_eq causes 'invalid pointer' error

    And the resulting patch that should be applied to svn soon:
    [PATCH] Fix the ffmpeg -rc_eq "foo" bug

    Also, I will not have internet acces for a week, so I can't reply until then.

    Update: This error has been fixed in today's SVN.
    Last edited by FakeOutdoorsman; July 14th, 2008 at 05:28 AM.

  9. #39
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    Re: HOWTO: Compile the latest ffmpeg and x264 from source

    I got one more question about ffmpeg on ubuntu. Just to see if there is anyone have any idea about this problem.

    I am using a quad core (q9450) cpu. But ffmpeg only utilize 25% cpu usage. I already add "-threads 4" or even "-threads 8" in the command line. But I don't see any increase in speed.

    I used to have over 200-250 fps in windows (320x240 video encoding). But I got only 100-150 fps in ubuntu (same video, same encoder setting.....).
    Last edited by maxbear; July 17th, 2008 at 02:04 AM. Reason: misspell

  10. #40
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    Smile Re: HOWTO: Compile the latest ffmpeg and x264 from source

    absolute gold. thanks for the howto.

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