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• FFmpeg script for linux and windows batch video encode different settings depending on video resolution [closed]

  28 décembre 2022, par Jaroslav Havel

  I'm looking for advice, help. I would like to convert all home videos to H265 using ffmpeg. Videos are in different formats and resolutions (3GP, mov, avi, mpg, mp4). I have an idea of which setting to set for which resolution, but I don't know how to write it all into a script (windows and linux). For these resolutions

  


  CRF 18-22 for <= 576p use 20
CRF 19-23 for > 576 and <= 720p use 21
CRF 20-24 for >720 and <= 1080p use 22
CRF 22-28 for >= 2160p 4K use 25


  


  For windows i have

  


  @ECHO OFF

FOR %%F IN ("*.*") DO (
     ffmpeg -i %%F -c:v libx265 -crf 20 -preset faster -profile:v main -pix_fmt yuv420p -acodec libmp3lame -b:a 192k %%~nF_new.mkv
)


  


  Big thanks for the help

  


• 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>

  


  `

  


• change video resolution to specific resolution using ffmpeg in python

  2 novembre 2022, par david

  I am trying the change the resolution of some videos. The original video resolution is 1920x1080. first, I have to change the resolution to 640X480. for this I used the following code :

  


  subprocess.call(['ffmpeg.exe', '-y', '-i', pname1, '-vf', 'scale=-1:480,setsar=1:1', '-c:v','libx264', '-c:a', 'copy', pname2])


  


  when I used this code it produces a file that I cannot open and when I try to open it in cmd it said : "Invalid data found when processing input".
I changed the code to this to have 640X480 :

  


  subprocess.call(['ffmpeg.exe', '-y', '-i', pname1, '-vf', 'scale=640:-2,setsar=1:1', '-c:v','libx264', '-c:a', 'copy', pname2])


  


  but the output is 640X360, what is the problem and how can I change the resolution from 1920x1080 to 640x480 ?
after that I have to change the resolution of videos to their original resolution (1920x1080) again.