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Sur d’autres sites (8547)

  • avcodec/pixlet : fix architecture-dependent code and values

    7 mars 2017, par Vittorio Giovara
    avcodec/pixlet : fix architecture-dependent code and values
    

    The constants used in the decoder used floating point precision,
    and this caused different values to be generated on different
    architectures.

    So, eradicate floating point numbers and use fixed point (32.32)
    arithmetics everywhere, replacing constants with precomputed integer
    values.

    Signed-off-by : Vittorio Giovara <vittorio.giovara at gmail.com>
    Signed-off-by : Paul B Mahol <onemda@gmail.com>

    • [DH] libavcodec/pixlet.c
  • pixlet : Fix architecture-dependent code and values

    2 mars 2017, par Vittorio Giovara
    pixlet : Fix architecture-dependent code and values
    

    The constants used in the decoder used floating point precision,
    and this caused different values to be generated on different
    architectures. Additionally on big endian machines, the fate test
    would output bytes in native order, which is different from the one
    hardcoded in the test.

    So, eradicate floating point numbers and use fixed point (32.32)
    arithmetics everywhere, replacing constants with precomputed integer
    values, and force the pixel format output to be the same in the fate
    test.

    Signed-off-by : Vittorio Giovara <vittorio.giovara@gmail.com>

    • [DBH] libavcodec/pixlet.c
    • [DBH] tests/fate/video.mak
    • [DBH] tests/ref/fate/pixlet
  • SOX got nothing from SoundFlower

    12 septembre 2016, par xiaose

    For some reason on some comps SoundFlower does not catch audio.
    I.e. there are SoundFlower but when I switch input\output to the SoundFlower I cannot get any sound. I have got only not empty file without any sound.

    Okay, how I try to get the sound...

    Just FYI :

    $ system_profiler SPSoftwareDataType

    Software:

       System Software Overview:

         System Version: OS X 10.10.5 (14F1912)
         Kernel Version: Darwin 14.5.0
         Boot Volume: Macintosh HD
         Boot Mode: Normal
         Computer Name: Craig Computer
         User Name: Craig (craigm)
         Secure Virtual Memory: Enabled
         Time since boot: 1 day22:12

    Gonna check is AVFoundation works :

    $ ./ffmpeg -h demuxer=avfoundation

    Demuxer avfoundation [AVFoundation input device]:
    AVFoundation input device AVOptions:
     -list_devices      <int>        .D...... list available devices (from 0 to 1) (default false)
        true                         .D......
        false                        .D......
     -video_device_index <int>        .D...... select video device by index for devices with same name (starts at 0) (from -1 to INT_MAX) (default -1)
     -audio_device_index <int>        .D...... select audio device by index for devices with same name (starts at 0) (from -1 to INT_MAX) (default -1)
     -pixel_format          .D...... set pixel format (default yuv420p)
     -framerate          .D...... set frame rate (default "ntsc")
     -video_size         .D...... set video size
     -capture_cursor    <int>        .D...... capture the screen cursor (from 0 to 1) (default 0)
     -capture_mouse_clicks <int>        .D...... capture the screen mouse clicks (from 0 to 1) (default 0)
    </int></int></int></int></int>

    Gonna get list of AVFoundation audio devices :

    $ ./ffmpeg -f avfoundation -list_devices true -i ’’

    ffmpeg version 3.1.1-tessus Copyright (c) 2000-2016 the FFmpeg developers
     built with Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn)
     configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --as=yasm --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzmq --enable-version3 --disable-ffplay --disable-indev=qtkit --disable-indev=x11grab_xcb
     libavutil      55. 28.100 / 55. 28.100
     libavcodec     57. 48.101 / 57. 48.101
     libavformat    57. 41.100 / 57. 41.100
     libavdevice    57.  0.101 / 57.  0.101
     libavfilter     6. 47.100 /  6. 47.100
     libswscale      4.  1.100 /  4.  1.100
     libswresample   2.  1.100 /  2.  1.100
     libpostproc    54.  0.100 / 54.  0.100
    [AVFoundation input device @ 0x7fda40421000] AVFoundation video devices:
    [AVFoundation input device @ 0x7fda40421000] [0] Built-in iSight
    [AVFoundation input device @ 0x7fda40421000] [1] Capture screen 0
    [AVFoundation input device @ 0x7fda40421000] AVFoundation audio devices:
    [AVFoundation input device @ 0x7fda40421000] [0] Soundflower (64ch)
    [AVFoundation input device @ 0x7fda40421000] [1] Built-in Microphone
    [AVFoundation input device @ 0x7fda40421000] [2] Soundflower (2ch)
    [AVFoundation input device @ 0x7fda40421000] [3] Built-in Input
    : Input/output error

    Okay, we have SoundFlower in devices :

    [AVFoundation input device @ 0x7fda40421000] [2] Soundflower (2ch)

    Then I run AppleScript which gonna switch to the "SoundFlower (2ch)" :

    enableSF("input")

    enableSF("output")

    Where enableSF(stdname) is :

    on enableSF(stdname)    
       tell application "System Preferences"  
           -- activate
           tell anchor stdname of pane "com.apple.preference.sound" to reveal  
           tell application "System Events"    
               tell application process "System Preferences"  
                   tell tab group 1 of window 1    
                       delay 2
                       set rowslist to selected of row of table 1 of scroll area 1
                       set counter to 0    
                       repeat with id in rowslist  
                           set counter to counter + 1  
                           set rowName to (value of text field 1 of row counter of table 1 of scroll area 1)  

                           set output to stdname &amp; " " &amp; rowName  
                           set scrpt to "echo \"" &amp; output &amp; "\" >> ~/Desktop/ds.log"  
                           do shell script scrpt  

                           if (rowName is equal to "Soundflower (2ch)") then  
                               set selected of row counter of table 1 of scroll area 1 to true

                               set output to "
                               !!! FOUND SF for " &amp; stdname &amp; " " &amp; rowName    
                               set scrpt to "echo \"" &amp; output &amp; "\" >> ~/Desktop/ds.log"  
                               log output  
                               do shell script scrpt
                               exit repeat
                           end if  
                       end repeat  
                   end tell    
               end tell    
           end tell    
       end tell    
    end enableSF    

    In result I have got this :

    input Internal Microphone
    input Line In
    input Digi CoreAudio Device
    input Soundflower (2ch)

           !!! FOUND SF for input Soundflower (2ch)

    output Headphones
    output Digi CoreAudio Device
    output Soundflower (2ch)

           !!! FOUND SF for output Soundflower (2ch)

    It means that we switch to the SoundFlower. Actually the same can be done by hands, but the script is more reliable as for me.

    Okay, next we can try to save some audio via SOX :

    $ /Applications/sox-14.3.2/sox -d /Desktop/out.wav

    Input File     : 'default' (coreaudio)
    Channels       : 2
    Sample Rate    : 44100
    Precision      : 32-bit
    Sample Encoding: 32-bit Signed Integer PCM


    In:0.00% 00:00:00.00 [00:00:00.00] Out:0     [      |      ]        Clip:0    
    ...
    ...
    ...
    In:0.00% 00:00:02.51 [00:00:00.00] Out:106k  [      |      ]        Clip:0    
    ...
    ...
    ...
    In:0.00% 00:00:11.80 [00:00:00.00] Out:516k  [      |      ]        Clip:0    /Applications/sox-14.3.2/sox WARN coreaudio: coreaudio: unhandled buffer overrun.  Data discarded.
    ...
    ...
    ...    
    In:0.00% 00:00:12.35 [00:00:00.00] Out:545k  [      |      ]        Clip:0    /Applications/sox-14.3.2/sox WARN coreaudio: coreaudio: unhandled buffer overrun.  Data discarded.
    ...
    ...
    ...
    In:0.00% 00:00:13.28 [00:00:00.00] Out:582k  [      |      ]        Clip:0    
    Aborted.

    And, as you can see, the SOX gives me an empty file. Rather, it gives the data, but there is no sound.

    This happens on all OS from 10.10 to 10.11.6. Normal output should be this type :

    In:0.00% 00:00:00.28 [00:00:00.00] Out:8.19k [======|======]        Clip:0      
    ...
    ...
    ...
    In:0.00% 00:00:04.37 [00:00:00.00] Out:188k  [ -====|===== ] Hd:1.1 Clip:0
    ...
    ...
    ...    
    In:0.00% 00:00:08.82 [00:00:00.00] Out:385k  [======|=====-] Hd:1.1 Clip:0      
    In:0.00% 00:00:09.01 [00:00:00.00] Out:393k  [-=====|=====-] Hd:1.1 Clip:0      
    In:0.00% 00:00:09.20 [00:00:00.00] Out:401k  [======|======] Hd:1.1 Clip:0