On Sat, 20 Jun 2020, M v D wrote:
I'm trying to convert a number of DVDs to MP4. Some of them work, others
result in lots of error messages and distorted output. All of them play
correctly in VLC if I open the IFO file, but the ones that give distorted
output fail to play in DVD if I open the VOB file. I'm using the following
command:
ffmpeg -i 'concat:VTS_02_1.VOB|VTS_02_2.VOB|VTS_02_3.VOB|VTS_02_4.VOB'
out.mp4
What stands out to me is that this message is only present for the DVDs
that fail:
[mpeg2video @ 0x7fffcfcfc0c0] ignoring pic cod ext after 0
More output, including lots of error messages for each frame, is included
below.
Does anyone know what this means and how I can fix it? Thanks in advance
for any help!
The short answer is -- don't do this. Use mplayer -dumpstream to create a
single .vob file, then use ffmpeg to convert that .vob to .mp4.
The longer answer is -- unfortunately, there are many links on the web
that suggest the approach you tried, but as you discovered it doesn't
always work. And that's because vob files on a dvd are not as simple as
they might appear.
There are multiple threads on this subject in the ffmpeg archives, I
suggest you do a little searching and read through some of them if you
want to understand why your original approach doesn't always work.
Try searching the ffmpeg mailing list with the following search
parameters:
site:lists.ffmpeg.org/pipermail/ffmpeg-user/ vob
site:lists.ffmpeg.org/pipermail/ffmpeg-user/ dvd
Not everything in those results will be relevant to your question, but you
should find several threads that are related.
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