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• Output file does not show up after executing ffmpeg command [closed]

  19 février 2024, par davai

  I'm using ffmpeg to combine an MP3 + G file and produce an MP4 file. I've placed the source code / .exe file for 'ffmpeg' in the project folder, and the MP3 + G files are also in the project folder. I also set the MP4 output to show up in the project folder as well. The weird thing is that, initially, I was producing output files, and while trying to tweak the constant rate factor, the MP4 output just stopped showing up entirely. I'm also not receiving any errors while running the code, and it does print out that the file has been successfully created, despite nothing showing up in the project folder.

  


  
        String mp3FilePath = "C:/Users/exampleuser/pfolder/example.mp3";
        String gFilePath = "C:/Users/exampleuser/pfolder/example.cdg";
        String mp4OutputPath = "C:/Users/exampleuser/pfolder/example.mp4";

        try
        {
            String[] command = {
                    "C:/Users/tonih/IdeaProjects/MP3GtoMP4Conversion/ffmpeg/ffmpeg-2024-02-19-git-0c8e64e268-full_build/bin/ffmpeg.exe",
                    "-i", mp3FilePath,       // Input MP3 file
                    "-r", "25",              // Frame rate
                    "-loop", "1",            // Loop input video
                    "-i", gFilePath,         // Input G file
                    "-c:v", "libx264",       // Video codec
                    "-preset", "slow",       // Encoding preset for quality (choose according to your requirement)
                    "-crf", "18",            // Constant Rate Factor (lower is higher quality, typical range 18-28)
                    "-c:a", "aac",           // Audio codec
                    "-b:a", "320k",          // Audio bitrate
                    "-shortest",             // Stop when the shortest stream ends
                    mp4OutputPath            // Output MP4 file
            };

            Process process = Runtime.getRuntime().exec(command);
            process.waitFor();
            System.out.println("MP4 file created successfully: " + mp4OutputPath);
        }
        catch (IOException | InterruptedException e)
        {
            e.printStackTrace();
        }


  


• FFmpeg : Specify pixel format for STD_IN input

  27 février 2024, par ShadowMagic896

  This is the current command :

  


  ffmpeg -i pipe:0 -pix_fmt yuv420p -f mp4 -vf "transpose=1" -f matroska pipe:1

  


  Essentially, it takes an MP4 file, rotates it 90 degrees, and converts it back to mtk and outputs it to STD_OUT.

  


  This is the error :

  


  WARNING:root:[mov,mp4,m4a,3gp,3g2,mj2 @ 000001ff9979dd00] stream 0, offset 0x50: partial file
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001ff9979dd00] Could not find codec parameters for stream 0 (Video: h264 (avc1 / 0x31637661), none, 170x144, 32 kb/s): unspecified pixel format
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'pipe:0':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp41isom
    creation_time   : 2024-02-26T20:53:03.000000Z
  Duration: 00:00:03.88, start: 0.000000, bitrate: N/A
  Stream #0:0[0x1](und): Video: h264 (avc1 / 0x31637661), none, 170x144, 32 kb/s, 30 fps, 30 tbr, 30k tbn (default)
      Metadata:
        creation_time   : 2024-02-26T20:53:03.000000Z
        handler_name    : VideoHandler
        vendor_id       : [0][0][0][0]
        encoder         : AVC Coding
  Stream #0:1[0x2](und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 192 kb/s (default)
      Metadata:
        creation_time   : 2024-02-26T20:53:03.000000Z
        handler_name    : SoundHandler
        vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (aac (native) -> vorbis (libvorbis))
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001ff9979dd00] stream 0, offset 0x50: partial file
[in#0/mov,mp4,m4a,3gp,3g2,mj2 @ 000001ff9978b080] Error during demuxing: Invalid data found when processing input
Cannot determine format of input 0:0 after EOF
[vf#0:0 @ 000001ff997d6040] Task finished with error code: -1094995529 (Invalid data found when processing input)
[vf#0:0 @ 000001ff997d6040] Terminating thread with return code -1094995529 (Invalid data found when processing input)
[aost#0:1/libvorbis @ 000001ff99cd1780] No filtered frames for output stream, trying to initialize anyway.
[vost#0:0/libx264 @ 000001ff997d4fc0] Could not open encoder before EOF
[vost#0:0/libx264 @ 000001ff997d4fc0] Task finished with error code: -22 (Invalid argument)
[vost#0:0/libx264 @ 000001ff997d4fc0] Terminating thread with return code -22 (Invalid argument)
[out#0/matroska @ 000001ff997a6180] Nothing was written into output file, because at least one of its streams received no packets.
frame=    0 fps=0.0 q=0.0 Lsize=       0KiB time=N/A bitrate=N/A speed=N/A    
Conversion failed!


  


  I am running this via Python, this is the script :

  


      async def send_proc_pipe(self) -> bytes:

        command = f"ffmpeg -hide_banner -loglevel error -i pipe:0 -pix_fmt yuv420p -f mp4 -vf \"transpose=1\" -f matroska pipe:1"

        proc = await asyncio.create_subprocess_shell(
            cmd=command,
            stdin=asyncio.subprocess.PIPE,
            stdout=asyncio.subprocess.PIPE,
            stderr=asyncio.subprocess.PIPE
        )
        
        std_in = self.blob

        c_out, c_err = await proc.communicate(std_in)
        if c_err:
            logging.warning(c_err.decode("utf-8"))

        return c_out


  


  I'm not really use what else to try here. I've re-ordered the parameters and tried different pixel formats with no success.

  


• Yet another ffmpeg concat audio sync issue [closed]

  15 mars 2024, par Demiurg

  I've read through dozens of posts, tried many suggestions, nothing seems to work for me. The funny part is that the video is fine in some players (e.g. Quicktime) but not the others (e.g. Chrome).

  


  This is what I currently use :

  


  ffmpeg -i segment.mp4 -q 0 -c copy segment.ts
ffmpeg -f concat -i videos.txt -c copy -y final.mp4


  


  This is what ffmpeg shows for the originals

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '52M35S_1710280355.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42isom
    creation_time   : 2024-03-12T21:53:35.000000Z
  Duration: 00:00:59.86, start: 0.000000, bitrate: 851 kb/s
  Stream #0:0[0x1](und): Audio: opus (Opus / 0x7375704F), 48000 Hz, mono, fltp, 10 kb/s (default)
    Metadata:
      creation_time   : 2024-03-12T21:53:35.000000Z
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](und): Video: hevc (Main) (hvc1 / 0x31637668), yuvj420p(pc, bt709), 1920x1080, 836 kb/s, 10.02 fps, 10 tbr, 90k tbn (default)
    Metadata:
      creation_time   : 2024-03-12T21:53:35.000000Z
      vendor_id       : [0][0][0][0]