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

[Hwaen Ch'uqi]

Greetings,

Out of pure frustration, I write again, having (I believe) read and
reread the relevant sections of the ffmpeg filters manual. The "best"
that I could come up with is the following command:

ffmpeg -i FILE.jpg -i FILE.mp3 -vf loop=-1:1:0 -shortest FILE.mp4

where the thinking is to have the jpg file loop until the audio file
has been completed. I do not include console output here, because
after more than an hour of the machine churning away and finally
interrupting the process, the console output had amassed to over 70MB!
The mp4 file, whose initial inputs were a jpg file of 1.8MB and an
audio file of 7.4MB, was 139.7MB and counting! So again, I ask for any
practical advice/explanation. Clearly, I still do not understand how
the loop video filter works.

Thank you again.

Hwaen Ch'uqi


On 11/1/18, Paul B Mahol <onemda at gmail.com> wrote:
> On 11/1/18, Hwaen Ch'uqi <hwaenchuqi at gmail.com> wrote:
>> 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,
>
> Sorry, I'm not doing somebody else homework, you need to read
> carefully documentation.
> Also full uncut FFmpeg output missing.
>
>>
>> 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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