[FFmpeg-user] Intermediate video format for Concatenation of video and images

[Paul B Mahol]

On 8/13/13, Dzung Nguyen <dzungng89 at gmail.com> wrote:
> Hi all,
>
> I'm converting image to videos, and then merging them together (because the
> length of the image slideshow is random, not fixed).
>
> 1) Image --> video:
>
> ffmpeg -loop 1 -f image2 -i image.png -c:v libx264 -tune stillimage -t 30
> video1.mp4
>
> 2) Concatenate subvideos:
>
> ffmpeg -f concat -i list.txt -c copy concatenated.mp4
>
> Which format should I use when creating subvideos? I found that mpeg lose
> the image quality, while using mp4 the output is unskippable.

With mpeg you can tweak quality. defaults do not target quality.
Also using mp4 should not really matter.

What by "unskippable output" you mean?