Merge one audio file and one image file to create a video with ffmpeg

Question

I first tried:
ffmpeg -y -i image.jpg -i audio.mp3 -c:a copy output.mp4

but when I uploaded to video sharing websites (bilibili.com), it says "no video track", so I tried:
ffmpeg -r 1 -loop 1 -i image.jpg -i audio.mp3 -acodec copy -r 1 -shortest output.mp4

The file was successfully uploaded, but when I watched it on the website, the image disappeared and it turned grey. I merged 6 videos and only one of them can be normally played back. (This is the URL to the video: click here, if you can visit the website you'll see what I mean.)
What should I do?

llogan · Answer

Problems with your command #2:

Frame rate is too low. Most players are unable to play 1 fps. Use 10 fps or higher for output, or set input -framerate to 10 fps or higher.
Chroma subsampling. Most players can only play 4:2:0, so use the format filter to force it to 4:2:0.
MP3 in MP4. Some players are unable to play MP3 in MP4. For highest compatibility use AAC. ffmpeg will choose AAC by default for MP4.
Faststart (optional). Add -movflags +faststart so MP4 can begin playback faster.

Command:
ffmpeg -framerate 1 -loop 1 -i image.jpg -i audio.mp3 -vf format=yuv420p -r 10 -shortest -movflags +faststart output.mp4

Merge one audio file and one image file to create a video with ffmpeg

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