From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paul Garlick Subject: Re: Video narration Date: Wed, 17 Apr 2019 23:11:56 +0100 Message-ID: <30bca313b07d1dc65c73d2e2c4d0e8907144081d.camel@tourbillion-technology.com> References: <660de50483d54150fa1ca67ebd0cae886d0ffcbe.camel@tourbillion-technology.com> <52a3d40df1ee349f48e7ecd79756e9307cbae034.camel@tourbillion-technology.com> <5893d6b8dc2dd4ed1cdcab3e109ce655d82bc493.camel@tourbillion-technology.com> <6f60665f899c24133818106831f378f087b9d405.camel@tourbillion-technology.com> <808a07682b858d44b1e48c69fd98fcb770837789.camel@tourbillion-technology.com> <0f4db135b01c57d8ab2fbf6721587664507dcefc.camel@tourbillion-technology.com> <3f393bb53fa8d04c0e9ae33df1eeadaf864940d5.camel@tourbillion-technology.com> <3ce59ef3d1e63fbc743ae0b71f317ef5916e0ccf.camel@tourbillion-technology.com> <87ef6g1e4k.fsf@elephly.net> <0b31a2364a97f26bbea1fed9e3390a2a526d6c77.camel@tourbillion-technology.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: Received: from eggs.gnu.org ([209.51.188.92]:40480) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hGsmh-0006DW-Qu for guix-devel@gnu.org; Wed, 17 Apr 2019 18:12:04 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hGsmg-0006rB-SZ for guix-devel@gnu.org; Wed, 17 Apr 2019 18:12:03 -0400 In-Reply-To: List-Id: "Development of GNU Guix and the GNU System distribution." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org Sender: "Guix-devel" To: Laura Lazzati Cc: Guix-devel Hi Laura, > Can you tell me which players work for you? I tried with my browser > and it still tells me that the file is corrupt :/ I have tested Parole and Videos media players and Firefox and Midori browsers. All work except Firefox, which gives the message: 'Video can't be played because the file is corrupt' Is Firefox the browser you are testing with? Possibly another tweak to the ffmpeg encoding might be needed to support Firefox. > I didn't notice this. Is it possible to make the audio shorter than > the first duration? Ah, the expression for duration1 should be: duration1 (in seconds) = number of frames / 25 What I was thinking was that the cli sessions should end with a short pause. This will be the case as long as either duration1 is greater than duration2 or the audio file has a silent section at the end. If any of the transitions are too abrupt we can add some silence to the relevant audio file. The command I used for the silent slide in 02- daily-use2 was: $ ffmpeg -f lavfi -i anullsrc=r=4800:cl=mono -t -q:a 9 -c:a libmp3lame .mp3 This creates an mp3 file with seconds of silence. So a one second pause, say, could be concatenated (with ffmpeg) at the beginning or end of an audio file to improve the transition. Best regards, Paul.