Am 10.11.2020 um 22:27 schrieb Randy Johnson via ffmpeg-user:
Hello,
When running the following command:
```
ffmpeg \
-loop 1 -framerate 30 -t 1.4 -i /assets/img/filler640480.jpg -i 0d.mp4 -
y \
-loop 1 -framerate 30 -t 891.113 -i /assets/img/filler640480.jpg -i
9f.mp4 -y \
-f lavfi -t 0.1 -i anullsrc=channel_layout=mono:sample_rate=48000 \
-filter_complex "
[0:v]setsar=1[v0];[2:v]setsar=1[v1];[v0][4:a][1:v][1:a][v1][4:a][3:v][3:a]concat=n=4:v=1:a=1"
-vsync 2 -vcodec libx264 -pix_fmt yuv420p 0245-grid.mp4
```
I am getting the following error:
```
Stream specifier ':a' in filtergraph description
[0:v]setsar=1[v0];[2:v]setsar=1[v1];[v0][4:a][1:v][1:a][v1][4:a][3:v][3:a]concat=n=4:v=1:a=1
matches no streams.
```
This only happens on some video processing not all, cannot seem to
figure out why.
You could check those videos with FFprobe. May be they have no audio
stream, or something else is different.
Michael
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