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• Alsa cannot set sample format[FFMPEG]

  18 mai 2017, par caiomcg

  I am trying to capture a pcm stream from a Roland USB device with ffmpeg and wrap it with wav. The command line I am using is the following :

  ffmpeg -f alsa -acodec pcm_s32le -ac 2 -ar 48000 -i hw:2,0 out.wav

  Which comply with the settings of the hardware. I can also capture the stream with Audacity. The problem is that FFMPEG throws "cannot set sample format error". Any idea of what may be happening and how I can fix this ?

  Thanks in advance.

  FFMPEG OUTPUT

  user@user:~$ ffmpeg -f alsa -acodec pcm_s32le -ac 2 -ar 48000 -i hw:2,0 out.wav
  
      ffmpeg version N-85548-g3390a2b Copyright (c) 2000-2017 the FFmpeg developers
  
        built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
  
        configuration: --enable-gpl --enable-libx264 --enable-libx265 --enable-libvpx --enable-libvorbis --enable-libopus --enable-ffplay
  
        libavutil      55. 61.100 / 55. 61.100
  
        libavcodec     57. 92.100 / 57. 92.100
  
        libavformat    57. 72.101 / 57. 72.101
  
        libavdevice    57.  7.100 / 57.  7.100
  
        libavfilter     6. 84.101 /  6. 84.101
  
        libswscale      4.  7.101 /  4.  7.101
  
        libswresample   2.  8.100 /  2.  8.100
  
        libpostproc    54.  6.100 / 54.  6.100
  
      [alsa @ 0x34b6780] cannot set sample format 0x10008 10 (Invalid argument)
  
      hw:2,0: Input/output error

  ARECORD OUTPUT :

  user@user:~$ arecord -l
  
  **** List of CAPTURE Hardware Devices ****
  
  card 1: PCH [HDA Intel PCH], device 0: ALC3236 Analog [ALC3236 Analog]
  
    Subdevices: 1/1
  
    Subdevice #0: subdevice #0
  
  card 2: DUOCAPTURE [DUO-CAPTURE], device 0: USB Audio [USB Audio]
  
    Subdevices: 1/1
  
    Subdevice #0: subdevice #0

  After Deimus help I checked the setting for my card in arecord and used the correct line for FFMPEG (Notice that I have changed the capture frequency on the hardware).

  ARECORD OUTPUT

  user@user:~$ arecord --dump-hw-params -D hw:2,0
  
  Recording WAVE 'stdin' : Unsigned 8 bit, Rate 8000 Hz, Mono
  
  HW Params of device "hw:2,0":
  
  --------------------
  
  ACCESS:  MMAP_INTERLEAVED RW_INTERLEAVED
  
  FORMAT:  S24_3LE
  
  SUBFORMAT:  STD
  
  SAMPLE_BITS: 24
  
  FRAME_BITS: 48
  
  CHANNELS: 2
  
  RATE: 44100
  
  PERIOD_TIME: (1020 1981429)
  
  PERIOD_SIZE: [45 87381]
  
  PERIOD_BYTES: [270 524286]
  
  PERIODS: [2 1024]
  
  BUFFER_TIME: (2040 3962858)
  
  BUFFER_SIZE: [90 174762]
  
  BUFFER_BYTES: [540 1048572]
  
  TICK_TIME: ALL
  
  --------------------
  
  arecord: set_params:1233: Sample format non available
  
  Available formats:
  
  - S24_3LE

  Correct command line

  ffmpeg -f alsa -acodec pcm_s24le -ac 2 -ar 44100 -i hw:2,0 out.wav

• Normalize video contrast to the full dynamic range with ffmpeg ?

  18 mai 2017, par Roofus

  The following ImageMagick command line normalizes the RGB channels of an image individually, so that in each channel, the smallest value maps to 0 and the largest value maps to 255 :

  convert fish.jpg -channel all -contrast-stretch 0.003x0.003% fish2.jpg

  fish.jpg
  fish2.jpg

  Is there an ffmpeg filter which can normalize the RGB channels of every individual frame of a video ?

  The only filter I can find is "histeq", which equalizes (flattens) rather than normalizes the contrast. I have applied it per RGB channel using variations on this command line :

  ffmpeg -i fish.jpg -vf "format=rgb24,extractplanes=r+g+b[r][g][b],[r]histeq=strength=.1[r2],[g]histeq=strength=.1[g2],[b]histeq=strength=.1[b2],[g2][b2][r2]mergeplanes=0x001020:gbrp" fish3.jpg

  but since it tries to flatten the histogram, it always gives a much different (unacceptable) result ; for example, the imgur image whose code is eHL51.jpg (not enough reputation for link).

  Based on this answer :
  video normalization with ffmpeg
  I have also tested -vf "scale=out_range=full" and -vf "pp=al:f" (see the log below) but in both cases the result fish3.jpg was unchanged from fish.jpg, so apparently nothing was done.

  C:\Users\Roofus\Desktop>ffmpeg -i fish.jpg -vf scale=out_range=full -color_range 2 -pix_fmt yuvj420p fish3.jpg
  
  ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 6.3.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-
  
  avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libb
  
  luray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-l
  
  ibmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libope
  
  njpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enabl
  
  e-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable
  
  -libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zli
  
  b
  
    libavutil      55. 34.101 / 55. 34.101
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.101 / 57. 56.101
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  Input #0, image2, from 'fish.jpg':
  
    Duration: 00:00:00.04, start: 0.000000, bitrate: 3942 kb/s
  
      Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 960x540 [SAR 96:96 DAR 16:9], 25 tbr, 25 tbn, 25 t
  
  bc
  
  [swscaler @ 0000000000442f60] deprecated pixel format used, make sure you did set range correctly
  
  Output #0, image2, to 'fish3.jpg':
  
    Metadata:
  
      encoder         : Lavf57.56.101
  
      Stream #0:0: Video: mjpeg, yuvj420p(pc), 960x540 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc57.64.101 mjpeg
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mjpeg (native) -> mjpeg (native))
  
  Press [q] to stop, [?] for help
  
  frame=    1 fps=0.0 q=2.2 Lsize=N/A time=00:00:00.04 bitrate=N/A speed=   5x
  
  video:23kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  
  
  C:\Users\Roofus\Desktop>fish3.jpg
  
  
  
  C:\Users\Roofus\Desktop>ffmpeg -i fish.jpg -vf "pp=al:f" -color_range 2 -pix_fmt yuvj420p fish3.jpg
  
  ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 6.3.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-
  
  avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libb
  
  luray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-l
  
  ibmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libope
  
  njpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enabl
  
  e-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable
  
  -libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zli
  
  b
  
    libavutil      55. 34.101 / 55. 34.101
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.101 / 57. 56.101
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  Input #0, image2, from 'fish.jpg':
  
    Duration: 00:00:00.04, start: 0.000000, bitrate: 3942 kb/s
  
      Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 960x540 [SAR 96:96 DAR 16:9], 25 tbr, 25 tbn, 25 t
  
  bc
  
  File 'fish3.jpg' already exists. Overwrite ? [y/N] y
  
  [Parsed_pp_0 @ 0000000000321da0] This syntax is deprecated. Use '|' to separate the list items.
  
  Output #0, image2, to 'fish3.jpg':
  
    Metadata:
  
      encoder         : Lavf57.56.101
  
      Stream #0:0: Video: mjpeg, yuvj420p(pc), 960x540 [SAR 96:96 DAR 16:9], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc57.64.101 mjpeg
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mjpeg (native) -> mjpeg (native))
  
  Press [q] to stop, [?] for help
  
  frame=    1 fps=0.0 q=2.2 Lsize=N/A time=00:00:00.04 bitrate=N/A speed=4.44x
  
  video:23kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  
  
  C:\Users\Roofus\Desktop>fish3.jpg

• Video stamping in Android

  18 mai 2017, par bhavesh solanki

  I want to stamp custom text on video recorded by my app, here i am using FFmpeg Video Library and throwing this command to stamp custom text on video as a stamp.

  ffmpeg -i /storage/emulated/0/RecordThrow/VID_20170510_195716.mp4 -vf drawtext="text='mycustomtext'" -codec:a copy /storage/emulated/0/output.mp4

  but I got invalid output format error and sometimes the process run for a long time and didn’t get a stamp on the video, after killing process I saw empty output.mp4 file on my device.so help me out about this issues.
  I think the main problem is in FFmpeg command that I posted.

  i am following this tutorial but i am getting below error :

  ************error**********

  built with gcc 4.8 (GCC) configuration : —target-os=linux
  —cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi-
  —arch=arm —cpu=cortex-a8 —enable-runtime-cpudetect —sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot
  —enable-pic —enable-libx264 —enable-libass —enable-libfreetype —enable-libfribidi —enable-libmp3lame —enable-fontconfig —enable-pthreads —disable-debug —disable-ffserver —enable-version3 —enable-hardcoded-tables —disable-ffplay —disable-ffprobe —enable-gpl —enable-yasm —disable-doc —disable-shared —enable-static —pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config —prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a —extra-cflags=’-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include
  -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all’ —extra-ldflags=’-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib
  -Wl,-z,relro -Wl,-z,now -pie’ —extra-libs=’-lpng -lexpat -lm’ —extra-cxxflags= libavutil 55. 17.103 / 55. 17.103 libavcodec 57. 24.102 / 57. 24.102 libavformat 57. 25.100 /
  57. 25.100 libavdevice 57. 0.101 / 57. 0.101 libavfilter 6. 31.100 / 6. 31.100 libswscale 4. 0.100 / 4. 0.100 libswresample 2. 0.101 / 2. 0.101 libpostproc 54. 0.100 /
  54. 0.100 [mov,mp4,m4a,3gp,3g2,mj2 @ 0xa62d3000] sample aspect ratio already set to 1:1, ignoring ’pasp’ atom (65536:65536) Input #0,
  mov,mp4,m4a,3gp,3g2,mj2, from
  ’/storage/emulated/0/RecordThrow/VID_20170510_195716.mp4’ :
  Metadata :
  major_brand : mp42
  minor_version : 0
  compatible_brands : isommp42
  creation_time : 2017-05-10 14:27:20
  com.android.version : 7.0 Duration : 00:00:02.70, start : 0.000000, bitrate : 16857 kb/s
  Stream #0:0(eng) : Video : h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte170m), 640x480, 16693 kb/s, SAR 1:1 DAR 4:3, 29.93
  fps, 30 tbr, 90k tbn, 180k tbc (default)
  Metadata :
  rotate : 90
  creation_time : 2017-05-10 14:27:20
  handler_name : VideoHandle
  Side data :
  displaymatrix : rotation of -90.00 degrees
  Stream #0:1(eng) : Audio : aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 129 kb/s (default)
  Metadata :
  creation_time : 2017-05-10 14:27:20
  handler_name : SoundHandle [NULL @ 0xa62d4800] Unable to find a suitable output format for ’ ffmpeg’ ffmpeg : Invalid argument