[FFmpeg-user] Optimization

Carl Eugen Hoyos ceffmpeg at gmail.com
Thu Nov 1 22:52:36 EET 2018

2018-11-01 21:36 GMT+01:00, Paul B Mahol <onemda at gmail.com>:
> On 11/1/18, Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:
>> 2018-11-01 3:31 GMT+01:00, Marcus Lim <drakeskywing at gmail.com>:
>>> Hey all,
>>> New to the list and trying to get my head around ffmpeg a bit still.
>>> So I am using ffmpeg to create slideshows out of individual images, with
>>> an
>>> audio backing track (usually mp3), and then encoding as MP4 (video is
>>> h264
>>> and audio is acc), but for some reason the process is taking up to 1.4Gb
>>> of
>>> memory which is blowing me away.
>>> Now I am using a complex filter to achieve this, with multiple inputs,
>>> and
>>> example of my command is below:
>>> ffmpeg \
>>> -loop 1 -t 4 -i
>>> test/ed141148-9b79-494b-a26d-f5c84535eeaf8912937006552540487.tmp \
>>> -loop 1 -t 4 -i
>>> test/ed141148-9b79-494b-a26d-f5c84535eeaf5351513282402727883.tmp \
>> I suggest you put the files names in a text file and use the concat
>> demuxer.
>> An alternative is to rename the files as tmp-01 to tmp-15 and use:
>> ffmpeg -i tmp-02%d
>> Both solutions will not have the increased memory usage and
>> will significantly simplify your command line.
> How it is supposed to loop for 4 seconds with above solutions?

The concat demuxer supports the duration command, the img2
demuxer an input frame rate.
Do you believe one of them will not work?

Carl Eugen

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