[FFmpeg-user] Optimization

Paul B Mahol onemda at gmail.com
Thu Nov 1 22:57:28 EET 2018

On 11/1/18, Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:
> 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?

Didn't know. It should work for images too, if not report a bug.

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