On 03/24/2016 07:37 PM, Moritz Barsnick wrote:
On Thu, Mar 24, 2016 at 17:50:40 -0600, jd1008 wrote:
Reason I am transcoding into mpeg1 is because the apps that create the
DVD format for playback on regular DVD's
take them way freaking too long to do the transcoding to mpeg1 (and that
is what they do to every video I try to
convert to DVD using the dvd creation apps.
ffmpeg seems to do it a lot faster.
So, when is ue these apps and the input video is already in mpeg1
format, they just proceed to create the
DVD format without transcoding.
I understand, I used to use similar programs, and appreciated that they
took my ffmpeg created input without reencoding.
But: mpeg2video is a much more effective codec for DVD. ffmpeg even has
a shortcut-option "-target dvd" (or "-target pal-dvd", "-target
ntsc-dvd") which sets several encoding options for DVD compatibility.
Moritz
Here is something strange or interesting when I add -target ntsc-dvd
ffmpeg -i a_short video.mp4 -s 1920x1080 -c:v mpeg1video -q:v 1 -mbd rd
-target ntsc-dvd -y a_short_video.mpg
Playing back the mpg video with ffplay yielded this output:
Input #0, mpeg, from
'I.Am.Number.Four.2011.1080p.BluRay.H264.AAC-RARBG-2.mpg':
Duration: 00:17:28.32, start: 0.528033, bitrate: 3355 kb/s
Stream #0:0[0x1bf]: Data: dvd_nav_packet
Stream #0:1[0x1e0]: Video: *mpeg2video* (Main), yuv420p(tv),
*720x480* [SAR 32:27 DAR 16:9], max. 9000 kb/s, 29.97 fps, 29.97 tbr,
90k tbn, 59.94 tbc
Stream #0:2[0x80]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s
And notice, ffplay says that the format is mpeg2 instead of mpeg1.
Is -target option reducing the resolution and changing the format?
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