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radek-k / FFMediaToolkit

FFMediaToolkit is a cross-platform video decoder/encoder library for .NET that uses FFmpeg native libraries. It supports video frames extraction, reading stream metadata and creating videos from bitmaps in any format supported by FFmpeg.
MIT License
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FfmpegException: Cannot decode a video frame with dimensions different than the previous one. #105

Closed ggolda closed 2 years ago

ggolda commented 2 years ago

I'm facing a strange exception with some video files:

FFMediaToolkit.FFmpegException: Cannot decode a video frame with dimensions different than the previous one.
 at FFMediaToolkit.Common.Internal.ImageConverter.AVFrameToBitmap(VideoFrame videoFrame, Byte* destination, Int32 stride)
   at FFMediaToolkit.Common.Internal.VideoFrame.ToBitmap(ImageConverter converter, ImagePixelFormat targetFormat, Size targetSize)
   at FFMediaToolkit.Decoding.VideoStream.GetFrame(TimeSpan time)
   at FFMediaToolkit.Decoding.VideoStream.TryGetFrame(TimeSpan time, ImageData& bitmap)

Can reproduce it 100% of times with a one webm file with such parameters (from ffprobe):

Input #0, matroska,webm, from '23c34405-f0f4-4495-92bb-6ce2eb667a01.webm':
  Metadata:
    encoder         : Chrome
  Duration: 00:00:26.19, start: 0.000000, bitrate: 1381 kb/s
    Stream #0:0(eng): Video: vp8, yuv420p(tv, bt709, progressive), 1364x766, SAR 1:1 DAR 682:383, 120 tbr, 1k tbn, 1k tbc (default)
    Metadata:
      alpha_mode      : 1

Other webm files work without any issues and without any exceptions. If necessary, can provide this video file.

Thanks!

hey-red commented 2 years ago

@ggolda Can you post sample file? I think it's can handled by rescale the frame according previously decoded, but it seems like currently is not implemented

ggolda commented 2 years ago

@hey-red Here is a file example (sharing using WeTransfer, github doesn't allow to upload webm): https://we.tl/t-mees6IrgsV

Sorry for a late reply.