[FFmpeg-user] Question about rendering and photo dimensions.

[Hwaen Ch'uqi]

Greetings Carl and Paul,

Thank you both for your advice. Paul, can you demonstrate how exactly
to use the loop video filter? I have tried:

ffmpeg -i FILE.jpg -i FILE.mp3 -vf loop=loop=1 FILE.mp4

The result is audio with a black screen rather than with an image. I
clearly have not understood the filter guide.

Thank you in advance,

Hwaen Ch'uqi


On 10/31/18, Paul B Mahol <onemda at gmail.com> wrote:
> On 10/30/18, Hwaen Ch'uqi <hwaenchuqi at gmail.com> wrote:
>> Greetings All,
>>
>> I am a newbie to ffmpeg and am quite impressed at the program's
>> capabilities. For the moment, I am simply combining an audio file with
>> a single still image to create an mp4 file. I am using this command:
>>
>> ffmpeg -loop 1 -i FILE.jpg -i FILE.mp3 -c:v libx264 -c:a aac -strict
>> experimental -b:a 192k -shortest FILE.mp4
>>
>> From what I can tell, it appears that picture files with smaller
>> dimensions - 2960x2640, for example - render quite easily, whereas
>> something like 4910x6054 causes the rendering to slow tremendously,
>> even to the point of hanging/crashing my computer! Has this something
>> to do with libx264 presets? What can I do to anticipate which picture
>> files will have this undesired effect? Are there flags that I can call
>> to help with these sizes? Any help would be appreciated!
>
> There is loop video filter, use it.
> Your command above will decode input image, over and over again,
> with loop video filter image is decoded only once and reused during loop.
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