Change mkv to mp4 (interlaced mpeg video)

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titanfan
Posts: 1
Joined: Tue Jan 20, 2015 1:26 am

Change mkv to mp4 (interlaced mpeg video)

Post by titanfan » Tue Jan 20, 2015 2:44 am

I'm using the latest windows ffmpeg build. To change interlaced mpeg video from a mkv to mp4 container, the command I'm using is "ffmpeg -i input.mkv -vcodec copy -acodec copy out.mp4". I'm concerned that the out.mp4 file has a variable frame rate, while the input.mkv file has a constant frame rate of 29.970:

input.mkv:
Width : 720 pixels
Height : 480 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 29.970 fps
Standard : NTSC
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Interlaced
Scan order : Top Field First

out.mp4:
idth : 720 pixels
Height : 480 pixels
Display aspect ratio : 16:9
Original display aspect ratio : 16:9
Frame rate mode : Variable
Frame rate : 24.077 fps
Original frame rate : 29.970 fps
Minimum frame rate : 20.000 fps
Maximum frame rate : 30.303 fps
Standard : NTSC
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Interlaced
Scan order : Top Field First

What's the best way to change containers on this video and maintain a constant frame rate without transcoding? I tried to force interlace support (-ilme), but the windows build doesn't seem to support that.

Thanks.

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