Hi,
I am completely new to the video world, so I am trying to learn from the
various resources on the Internet.
I am running ffmpeg on a Unix (OpenBSD) system.
I have a webcam that is capturing 4 still (jpeg) images per minute. The
jpeg is stored in a filename YYYY-MM-DD-hh-mm-ss. Once an hour, I use
ffmpeg to create an mp4 movie of all the stills for the day.
ffmpeg -y -pattern_type glob -i "image_2020-04-11-*.jpeg" -c:v libx264
-preset ultrafast today.mp4
As the day progresses, the ffmpeg is encoding more and more images and
totally recreating "today.mp4".
Is there a way to just append the new jpeg files to "today.mp4"?
I can change formats, whatever it takes if it's possible.
Reading the faq, there are various "concat" options, but I am not sure
if they are relevant. The one that seemed to make the most sense is:
3.14.2 Concatenating using the concat demuxer
FFmpeg has a concat demuxer which you can use when you want to avoid a
re-encode and your format doesn’t support file level concatenation.
I don't want to re-encode all the jpeg images... so I was thinking I
could create an "hourly" mp4 of the new jpeg images and then use the
concat demuxer to combine the 2 mp4's into a new (third) file. But I
was wondering if there was a more efficient way to do this.
Can I specify "ffmpeg -i today.mp4" -y pattern_type glob -i
"image_2020-04-11-*.jpeg" ...
Looking at "3 Detailed description" in the documentation, it looks like
that would run the today.mp4 through the demuxer, decoder, then
re-encode it all. I am trying to avoid the decoding / re-encoding of
the existing mp4.
Is this even possible?
Thanks,
Steve Williams
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