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• FFmpeg conversion failed with "Subtitle encoding failed" and "canvas_size is too small" [closed]

  21 avril, par Hillol Talukdar

  I'm converting video files using FFmpeg, but the process fails and shows some errors that I don't fully understand the cause of. How can I avoid the error and fix the issue ? Below is the command I used and the output I received.

  


  FFmpeg Command :

  


  ffmpeg -y -hide_banner -i saf:12.VOB -map 0:3 -c:s:0 dvdsub -map 0:2 -map 0:1 -f mp4 -vcodec copy -map_metadata 0:g -acodec aac -async 1 saf:13.mp4


  


  ErrorMessage :

  


  Input #0, mpeg, from 'saf:12.VOB':
  Duration: 00:00:21.99, start: 0.280633, bitrate: 7147 kb/s
  Stream #0:0[0x1bf]: Data: dvd_nav_packet
  Stream #0:1[0x1e0]: Video: mpeg2video, yuv420p(tv, top first), 720x480 [SAR 32:27 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn
    Side data:
      cpb: bitrate max/min/avg: 7816000/0/0 buffer size: 1835008 vbv_delay: N/A
  Stream #0:2[0xa0]: Audio: pcm_dvd, 48000 Hz, stereo, s16, 1536 kb/s
  Stream #0:3[0x20]: Subtitle: dvd_subtitle
  Stream #0:4[0x21]: Subtitle: dvd_subtitle

Stream mapping:
  Stream #0:3 -> #0:0 (dvd_subtitle (dvdsub) -> dvd_subtitle (dvdsub))
  Stream #0:2 -> #0:1 (pcm_dvd (native) -> aac (native))
  Stream #0:1 -> #0:2 (copy)

Press [q] to stop, [?] for help

Output #0, mp4, to 'saf:13.mp4':
  Metadata:
    encoder         : Lavf60.3.100
  Stream #0:0: Subtitle: dvd_subtitle (mp4s / 0x7334706D), 720x480
    Metadata:
      encoder         : Lavc60.3.100 dvdsub
  Stream #0:1: Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s
    Metadata:
      encoder         : Lavc60.3.100 aac
  Stream #0:2: Video: mpeg2video (mp4v / 0x7634706D), yuv420p(tv, top first), 720x480 [SAR 32:27 DAR 16:9], q=2-31, 29.97 fps, 29.97 tbr, 90k tbn
    Side data:
      cpb: bitrate max/min/avg: 7816000/0/0 buffer size: 1835008 vbv_delay: N/A

frame=   15 fps=0.0 q=-1.0 size=       0kB time=00:00:00.73 bitrate=   0.5kbits/s speed= 212x    
frame=  577 fps=0.0 q=-1.0 size=    5120kB time=00:00:19.18 bitrate=2186.2kbits/s speed=38.1x    

[dvdsub @ 0xb400006ffb03dde0] canvas_size(0:0) is too small(719:479) for render
[sost#0:0/dvdsub @ 0xb400006feaec5730] Subtitle encoding failed
[aac @ 0xb400006ffb02f500] Qavg: 36253.348
[aac @ 0xb400006ffb02f500] 2 frames left in the queue on closing

Conversion failed!


  


• fftools/cmdutils : fix error message for "ffmpeg -init_hw_device list"

  26 mars, par Jun Zhao

  fftools/cmdutils : fix error message for "ffmpeg -init_hw_device list"
  When running 'ffmpeg -init_hw_device list' to display available hardware
  
  devices, it incorrectly shows an error message :
  
  "Failed to set value 'list' for option 'init_hw_device' : Immediate exit requested"
  This is a regression introduced by commit a50f90f1c23. The command is
  
  actually working as intended - it should exit after listing devices, but
  
  shouldn't display an error message.
  Signed-off-by : Jun Zhao <barryjzhao@tencent.com>
  

  • [DH] fftools/cmdutils.c

• FFmpeg drawtext filter error : "Cannot find a valid font for the family Sans"

  7 septembre 2024, par fatdrogen

  I'm trying to add text overlay to a video using FFmpeg's drawtext filter in my iOS app, but I'm encountering the following error :

  


  error : Cannot load default config file

  


  ERROR : Cannot find a valid font for the family Sans

  


  ERROR : Error initializing filter 'drawtext'

  


  ERROR : with args 'text=write some thing :'

  


  Here's the relevant part of my FFmpeg command :

  


  Copydrawtext=text='write some thing '

  


  Questions :

  


  What's causing this error, and how can I resolve it ?
Is there a way to specify a font that's guaranteed to be available on iOS devices ?
Are there any alternative approaches to adding text overlay in FFmpeg that might avoid this issue ?

  


  Environment :

  


  Platform : iOS
FFmpeg : Using MobileFFmpeg library
Swift

  


  Any help or guidance would be greatly appreciated !

  


  func makeGIFData(asset: AVAsset,  startTime: Double, endTime: Double, rotation: Double, overlayText: String) async throws -> Data {
    let fileName = "\(ProcessInfo.processInfo.globallyUniqueString)_input.mp4"
    let fileURL = URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent(fileName)
    
    // Export the asset to a temporary file
    guard let exporter = try? await AVAssetExportSession(asset: asset, presetName: AVAssetExportPresetHighestQuality) else {
        throw NSError(domain: "GIFConversionError", code: -1, userInfo: [NSLocalizedDescriptionKey: "Failed to create AVAssetExportSession"])
    }
    
    exporter.outputURL = fileURL
    exporter.outputFileType = .mp4
    exporter.timeRange = CMTimeRange(start: CMTime(seconds: startTime, preferredTimescale: 600), end: CMTime(seconds: endTime, preferredTimescale: 600))
    
    do {
        try await exporter.export()
    } catch {
        throw NSError(domain: "GIFConversionError", code: -2, userInfo: [NSLocalizedDescriptionKey: "Failed to export video: \(error.localizedDescription)"])
    }
    
    let outfileName = "\(ProcessInfo.processInfo.globallyUniqueString)_outfile.gif"
    let outfileURL = URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent(outfileName)
    
    // Get video dimensions
    guard let track = try? await asset.loadTracks(withMediaType: .video).first,
          let videoSize = try? await track.load(.naturalSize) else {
        throw NSError(domain: "GIFConversionError", code: -4, userInfo: [NSLocalizedDescriptionKey: "Failed to get video dimensions"])
    }
    
    // Prepare FFmpeg command
    var command = "-i \(fileURL.path) -vf "
    
    
    // Add text overlay
    let escapedText = overlayText.replacingOccurrences(of: ":", with: "\\:").replacingOccurrences(of: "'", with: "\\'")
    let fontColor = textColor.toHexString()
    
    // Use a more universally available font, or provide multiple options
    filters += ",drawtext=text='write some thing ':"
    
    // Add palette generation and application
    filters += ",split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse"
    
    // Add filters to command
    command += "\"\(filters)\""
    
    // Finalize command
    command += " -loop 0 \(outfileURL.path)"
    
    print("FFmpeg command: \(command)")
    
    let startTime = CFAbsoluteTimeGetCurrent()
    
    let result = MobileFFmpeg.execute(command)
    
    if result != RETURN_CODE_SUCCESS {
        throw NSError(domain: "GIFConversionError", code: Int(result), userInfo: [NSLocalizedDescriptionKey: "FFmpeg conversion failed"])
    }
    
    let timeElapsed = CFAbsoluteTimeGetCurrent() - startTime
    print("Time elapsed: \(timeElapsed) s.")
    
    // Read the generated GIF file
    guard let gifData = try? Data(contentsOf: outfileURL) else {
        throw NSError(domain: "GIFConversionError", code: -3, userInfo: [NSLocalizedDescriptionKey: "Failed to read generated GIF file"])
    }
    
    print("Animated GIF data created successfully. Size: \(gifData.count) bytes")
    
    // Clean up temporary files
    try? FileManager.default.removeItem(at: fileURL)
    try? FileManager.default.removeItem(at: outfileURL)
    
    return gifData
}
'''