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Sur d’autres sites (13996)

  • How to convert a single photo into video with some filters ?

    11 avril 2019, par Zedd W

    I have a picture in jpeg format : cat.

    I converted this picture into a video through some ffmpeg filter : scale and zoompan. The video is that the picture is slowly enlarged

    Then, I encountered some problems when using the following command.

    command 1

    ffmpeg -loop 1 -i cat.jpeg -filter_complex "scale=iw*2:-1,zoompan=z='zoom+0.002':x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)':s=720x960" -pix_fmt yuv420p -vcodec libx264 -preset ultrafast -crf 28 -y -t 5 out.mp4

    command 2 (Just adjust the scale value of command 1)

    ffmpeg -loop 1 -i cat.jpeg -filter_complex "scale=iw*8:-1,zoompan=z='zoom+0.002':x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)':s=720x960" -pix_fmt yuv420p -vcodec libx264 -preset ultrafast -crf 28 -y -t 5 out.mp4

    Problems :

    1. The picture in the video will zoom in slowly, which is true, but until about the fourth second, the picture will return to the minimum and re-enlarge.Is this the filter parameter I used wrong ?

    2. There is a warning after running the command : [swscaler @ 0x113c66000] Warning: data is not aligned! This can lead to a speed loss. The picture size is 720 x 960 and the video is the same. 720/16 is an integer and 960/16 also an integer. So what not aligned ?

    3. There is another warning : deprecated pixel format used, make sure you did set range correctly. Did I set the pix_fmtparameter wrong ?

    4. command 2 and command 1 are different scale value, But the time they run will vary greatly (If you try to run it). Using a larger scale will have better results. So how to choose a scale value or have better way ?

  • How to convert a single photo into video with some filters without losing performance ?

    11 avril 2019, par Zedd W

    I have a picture in jpeg format : cat.

    I converted this picture into a video through some ffmpeg filter : scale and zoompan. The video is that the picture is slowly enlarged

    Then, I encountered some problems when using the following command.

    command 1

    ffmpeg -loop 1 -i cat.jpeg -filter_complex "scale=iw*2:-1,zoompan=z='zoom+0.002':x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)':s=720x960" -pix_fmt yuv420p -vcodec libx264 -preset ultrafast -crf 28 -y -t 5 out.mp4

    command 2 (Just adjust the scale value of command 1)

    ffmpeg -loop 1 -i cat.jpeg -filter_complex "scale=iw*8:-1,zoompan=z='zoom+0.002':x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)':s=720x960" -pix_fmt yuv420p -vcodec libx264 -preset ultrafast -crf 28 -y -t 5 out.mp4

    Problems :

    1. The picture in the video will zoom in slowly, which is true, but until about the fourth second, the picture will return to the minimum and re-enlarge.Is this the filter parameter I used wrong ?

    2. There is a warning after running the command : [swscaler @ 0x113c66000] Warning: data is not aligned! This can lead to a speed loss. The picture size is 720 x 960 and the video is the same. 720/16 is an integer and 960/16 also an integer. So what not aligned ?

    3. There is another warning : deprecated pixel format used, make sure you did set range correctly. Did I set the pix_fmtparameter wrong ?

    4. command 2 and command 1 are different scale value, But the time they run will vary greatly (If you try to run it). Using a larger scale will have better results. So how to choose a scale value or have better way ?

  • How to convert a single picture into video with some filters without losing performance ?

    11 avril 2019, par Zedd W

    I have a picture in jpeg format : cat.

    I converted this picture into a video through some ffmpeg filter : scale and zoompan. The video is that the picture is slowly enlarged

    Then, I encountered some problems when using the following command.

    command 1

    ffmpeg -loop 1 -i cat.jpeg -filter_complex "scale=iw*2:-1,zoompan=z='zoom+0.002':x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)':s=720x960" -pix_fmt yuv420p -vcodec libx264 -preset ultrafast -crf 28 -y -t 5 out.mp4

    command 2 (Just adjust the scale value of command 1)

    ffmpeg -loop 1 -i cat.jpeg -filter_complex "scale=iw*8:-1,zoompan=z='zoom+0.002':x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)':s=720x960" -pix_fmt yuv420p -vcodec libx264 -preset ultrafast -crf 28 -y -t 5 out.mp4

    Problems :

    1. The picture in the video will zoom in slowly, which is true, but until about the fourth second, the picture will return to the minimum and re-enlarge.Is this the filter parameter I used wrong ?

    2. There is a warning after running the command : [swscaler @ 0x113c66000] Warning: data is not aligned! This can lead to a speed loss. The picture size is 720 x 960 and the video is the same. 720/16 is an integer and 960/16 also an integer. So what not aligned ?

    3. There is another warning : deprecated pixel format used, make sure you did set range correctly. Did I set the pix_fmtparameter wrong ?

    4. command 2 and command 1 are different scale value, But the time they run will vary greatly (If you try to run it). Using a larger scale will have better results. So how to choose a scale value or have better way ?

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