I am trying to convert a 1080i MPEG2 transport stream (HDTV) to 720p. If I set the video size to 1280x720 with Autosize set to 16:9, I lose the 16:9 flag. If I change the video size to 1280x724, I get the 16:9 flag. Why is that?
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Perhaps it's not the 16:9 flag.
My original file looks like this in MPEG StreamClip:
Duration: 0:00:49
Data Size: 97.26 MB
Bit Rate: 16.46 Mbps
Video Tracks:
49 MPEG-2, 1920 × 1080, 16:9, 23.976 fps, 65.00 Mbps, upper field first
Audio Tracks:
52 AC3 3/2, 48 kHz, 384 kbps
The resulting file looks like this:
Duration: 0:00:49
Data Size: 71.43 MB
Bit Rate: 12.17 Mbps
Video Tracks:
224 MPEG-2, 1280 × 720, 59.94 fps, 104.86 Mbps, progressive
Audio Tracks:
128 AC3 3/2, 48 kHz, 384 kbps
Where the heck did the 104.86 Mbps come from?
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If I set the Video size to 1280x720, then Autosize to "Unconstrained", it would appear that I get what I want.
Edit: No, I definitely need the aspect ratio flag. -
Ffmpeg will not set the display aspect ratio flag if the size of the image is 16:9 (the ffmpegX documentation is incorrect when it states "Using 16:9 ratios or presets also apply a 16:9 special flag to mpeg-2 streams."). However, I've discovered that I can set the aspect ratio flag with a hex editor.
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