avformat/img2enc: mention -frames:v in error message
Signed-off-by: NLou Logan <lou@lrcd.com> Signed-off-by: NKieran O Leary <kieran.o.leary@gmail.com>
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Signed-off-by: NLou Logan <lou@lrcd.com> Signed-off-by: NKieran O Leary <kieran.o.leary@gmail.com>