Recherche avancée

Sur d’autres sites (7233)

• FFmpeg split 10 bit HDR x265 mp4 to exr sequence

  13 juillet 2022, par bvs

  I have x265 mp4 files of gameplay recorded with Nvidia Shadowplay with HDR information which I want to display in two places : my Vulkan app which supports HDR EXRs and Affinity photo which I paid for and acts as my control and also supports HDR exr under its HDR 32-Bit Preview panel. I can also convert to mov with FFmpeg to check that this isn't just an mp4 problem) by converting to mov first

  


  ffmpeg -i input.mp4 output.mov


  


  When I go to grab the image sequence of exrs with

  


  ffmpeg -i input.mp4 output%04d.exr


  


  My resulting image in my control (Affinity) is incredibly washed out and not HDR at all. How, using ffmpeg, can I grab the still frames from my recorded video. Am I missing a conversion, is this an error in ffmpeg itself, or something else ?

  


• Stuck in deadend while compiling ffmpeg with nvidia CUDA support on Ubuntu 18.04 and GeForce GT 730

  24 février 2019, par Marko

  I want to compile ffmpeg with CUDA support, on Ubuntu 18.04, and my graphics card is GeForce GT 730 (so far I have not CUDA programming experience).
  Here nvidia claims that it has at least some transcoding support.

  I have cloned https://git.ffmpeg.org/ffmpeg.git and as I understand I also need to build and install nv-codec-headers.

  But there in the README, they say that minimum driver version for Linux is 418.30 or newer. So I went to nvidia site to download driver and after selecting my card I got this download link. So the driver version is high enough it seems. But when I try to install it I get message that this device will be ignored by that driver and that it is supported by legacy driver 390.xx (which is version I can install with apt).
  Is something wrong with nVidia, why are they offering me driver that is cannot be used for this device ?

  I’ve installed 390.xx driver using ubuntu-drivers autoinstall and built ffmpeg, but when I try to run it I get this error : Cannot load cuvidGetDecodeStatus [h264_cuvid @ 0x562a86dbc680] Failed loading nvcuvid.

  I suppose it is because of driver ?

  So, what can I do to unstuck myself ?

• 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