On 1/19/20, Michael Koch <astroelectro...@t-online.de> wrote: > Am 19.01.2020 um 21:56 schrieb Paul B Mahol: >> On 1/19/20, Michael Koch <astroelectro...@t-online.de> wrote: >>> Am 19.01.2020 um 21:01 schrieb Paul B Mahol: >>>> On 1/19/20, Michael Koch <astroelectro...@t-online.de> wrote: >>>>> Hello, >>>>> >>>>> I've just found a problem that can be reproduced as follows: >>>>> >>>>> Step 1: Make a 6 seconds test video with 1kHz tone. The file is ok when >>>>> played. >>>>> >>>>> ffmpeg -f lavfi -i testsrc2=size=vga -f lavfi -i sine=1000 -t 6 -y >>>>> video.mp4 >>>>> >>>>> >>>>> Step 2: Make a 10 seconds audio file with silence and a short 3kHz tone >>>>> at t=3s. The file is ok when played. >>>>> >>>>> ffmpeg -f lavfi -i "sine=3000:duration=0.1" -af adelay=3000,apad -t 10 >>>>> -y audio.wav >>>>> >>>>> >>>>> Step 3: Combine both files into one video, and the audio sources shall >>>>> be mixed: >>>>> >>>>> ffmpeg -i video.mp4 -i audio.wav -filter_complex >>>>> "[0:a][1:a]amix=weights='1.0 1.0'" -shortest -y out.mp4 >>>>> >>>>> The output video has the correct length 6s, but I don't understand why >>>>> the 1kHz tone disappears after 4s and the last 2s are silence. >>>>> >>>>> The console output is below. >>>> Can not reproduce using nut container. >>> When I change the output filename to out.nut, then it works as expected >>> (but with terrible image quality). Why doesn't it work with mp4 output? >> Use different video encoder. Who knows? > > When I add -c:v mpeg4 then it works fine. > When I add -c:v libx264 then the audio output is 2s too short. > Is it a bug, or is something wrong with my command line? >
Dunno. > Michael > > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".