local png_files
if which ffmpeg 1> /dev/null 2>&1; then
- set +e
- png_files=$(ls ${dest}/${dest}-${group}-f*.png 2> /dev/null)
- set -e
+ png_files=$(ls ${dest}/${dest}-${group}-f*.png 2> /dev/null || echo "")
if [ x"${png_files}" != x"" ]; then
log_dbg "generate_video start"