display only lines from output that contains a specified word

Question

819 views Asked by JoBe At 24 November 2024 at 14:10

I'm looking for a way to get only the lines that contains a specified word, in this case all lines that contains the word Stream from an output

I've tried;

streams=$(ffprobe -i  "movie.mp4"  | grep "Stream")

but that didn't get any results..

or do I need to output it to a file and then try to extract the lines I'm looking for?

There are 2 answers

llogan On 21 October 2020 at 20:44

No need for grep. Just use ffprobe directly to get whatever info you need.

ffprobe -loglevel error -show_format -show_streams input.mp4

ffprobe -loglevel error -show_streams -select_streams v input.mp4

ffprobe -loglevel error -show_streams -select_streams a input.mp4

**tink** · Accepted Answer · 2020-10-12 20:24:02

tink On 12 October 2020 at 20:24 BEST ANSWER

@paulsm4 was spot on ... the output goes to STDERR.

streams=$(ffprobe -i  "movie.mp4"  |& grep "Stream")

Note the &