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• ffmpeg : Could not find audio only device

  5 août 2023, par ENunn

  I'm trying to record something off my sound card through ffmpeg, but it refuses to work.

  


  So I first got the list of my devices.

  


  ffmpeg -list_devices true -f dshow -i dummy
[dshow @ 00000228d837f240] "Digital Audio (S/PDIF) (2- Sound Blaster X-Fi Xtreme Audio)" (audio)
[dshow @ 00000228d837f240]   Alternative name "@device_cm_{33D9A762-90C8-1"1D0-BD43-00A0C911CE86}\wave_{B7E10DA0-B1E9-4930-8E38-90AECFE61349}


  


  Then I try to get an input working.

  


  ffmpeg -rtbufsize 1702000k -f dshow -audio_pin_name 1 -channels 2 -sample_rate 48000 -acodec pcm_s16le -i audio="Digital Audio (S/PDIF) (2- Sound Blaster X-Fi Xtreme Audio)" -c copy -f wav


  


  However, I get an error message.

  


  Trailing option(s) found in the command: may be ignored.
[dshow @ 0000025b849efa80] Could not set audio only options
[dshow @ 0000025b849efa80] Searching for audio device within video devices for Digital Audio (S/PDIF) (2- Sound Blaster X-Fi Xtreme Audio)
[dshow @ 0000025b849efa80] Could not find audio only device with name [Digital Audio (S/PDIF) (2- Sound Blaster X-Fi Xtreme Audio)] among source devices of type video.
audio=Digital Audio (S/PDIF) (2- Sound Blaster X-Fi Xtreme Audio): I/O error


  


  Don't know why it's saying it can't find an audio only device with that name when there's clearly an audio only device with that name. Tried truncating the name as well, and it didn't work either. Is there a fix for this ? I'm running ffmpeg version N-105384-g6a86dd1172-ge102fd98d6+3.

  


• How can I combine HDR video with a still PNG in FFMPEG without messing up colors ?

  2 juin 2022, par Robert

  I'm trying to add a still image to the end of a video as a title-card. Normally this is simple, but the video is HDR (shot on an iPhone) and for reasons I don't understand that's causing the colors in the PNG to go nuts.

  


  Here's the original png :


  


  Here's a screenshot from the end of the output video :


  


  Clearly something is amiss. I made the PNG image in Photoshop from a photo, and I've tried it with and without embedding the color profile without any noticeable difference.

  


  Here's the command for ffmpeg :

  


  ffmpeg -y\
 -t 5 -i '../inputs/video.MOV'\
 -loop 1 -t 5 -i '../../common/end-youtube.png'\
 -filter_complex '
[1:v] fade=type=in:duration=1:alpha=1, setpts=PTS-STARTPTS+5/TB[end];
[0:v][end] overlay [outV]
'\
 -map [outV] '../test.mp4'


  


  I've tried this with non-HDR videos and the colors look perfectly normal, so clearly the HDRness is somehow involved. I've also tried adding this line to set the colorspace etc of the output. It helps with the PNG (although it's not perfect) but then the video is washed out.

  


   -colorspace bt709 -color_trc bt709 -color_primaries bt709 -color_range mpeg \


  


  I don't really care if the output video is HDR or not, as long as the video and png parts both look visually close to the inputs. This is something I'll need to do to many videos, so if possible a solution that doesn't involve tweaking colors for each one would be ideal.

  


• nvenc encoder performed resolution 2560 * 1440 encoding yuv444 failed ？

  8 novembre 2022, par Travis990

  NVIDIA Gefore GTX 1660Ti graphics card, I use video-sdk-samples for HEVC encoding, YUV format : NV_ENC_BUFFER_FORMAT_YUV444, resolution “1920 * 1080” and “3840 * 2160” resolution encoding is successful, but resolution 2560*1440 encoding, prompting error info :NV_ENC_ERR_INVALID_PARAM, I do not know where the problem lies ?

  


  void NvEncoder::DoEncode(NV_ENC_INPUT_PTR inputBuffer, std::vector<bool> &amp;vKeyFrame, std::vector> &amp;vPacket, NV_ENC_PIC_PARAMS *pPicParams)&#xA;{&#xA;    NV_ENC_PIC_PARAMS picParams = {};&#xA;    if (pPicParams)&#xA;    {&#xA;        picParams = *pPicParams;&#xA;    }&#xA;    picParams.version = NV_ENC_PIC_PARAMS_VER;&#xA;    picParams.pictureStruct = NV_ENC_PIC_STRUCT_FRAME;&#xA;    picParams.inputBuffer = inputBuffer;&#xA;    picParams.bufferFmt = GetPixelFormat();&#xA;    picParams.inputWidth = GetEncodeWidth();&#xA;    picParams.inputHeight = GetEncodeHeight();&#xA;    picParams.outputBitstream = m_vBitstreamOutputBuffer[m_iToSend % m_nEncoderBuffer];&#xA;    picParams.completionEvent = m_vpCompletionEvent[m_iToSend % m_nEncoderBuffer];&#xA;    NVENCSTATUS nvStatus = m_nvenc.nvEncEncodePicture(m_hEncoder, &amp;picParams);&#xA;    if (nvStatus == NV_ENC_SUCCESS || nvStatus == NV_ENC_ERR_NEED_MORE_INPUT)&#xA;    {&#xA;        m_iToSend&#x2B;&#x2B;;&#xA;        GetEncodedPacket(m_vBitstreamOutputBuffer, vKeyFrame, vPacket, false);&#xA;    }&#xA;    else&#xA;    {&#xA;        printf("picParams.inputWidth = %d,picParams.inputHeight = %d \n", picParams.inputWidth, picParams.inputHeight);&#xA;        NVENC_THROW_ERROR("nvEncEncodePicture API failed", nvStatus);&#xA;    }&#xA;}&#xA;&#xA;error:&#xA;nvEncEncodePicture Prompt Error：NV_ENC_ERR_INVALID_PARAM &#xA;&#xA;</bool>

  


  `