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Sur d’autres sites (3118)

  • Sound is lost when concatenate several videos with ffmpeg

    18 août 2020, par Yevhenii Molodtsov

    I have a python script that generates an FFmpeg command and then runs it with shell.
Everything is going okay (the videos are concatenated, the needed cross-dissolve effect is also great), but there are two problems I am trying to fix :

    


      

    1. The output loses the sound.

      2. 


    2. The output is frizzing a little bit (it seems like there are about 10 fps).

      3. 


    


    The example of command generatede by the script is here :

    


    ffmpeg -i /tmp/media/import-2020-Aug-18-Tuesday-08-31-10/temp_8ce3c8ac-
1379-4a16-b141-ebdc910e1142.mp4 -i /tmp/media/import-2020-Aug-18-
Tuesday-08-31-10/temp_d9f60ffb-0a83-4052-8ebb-620a574d1871.mp4 -i 
/tmp/media/import-2020-Aug-18-Tuesday-08-31-10/temp_93934eaa-9589-4736-
8d11-fd8c1bdf0b92.mp4  -filter_complex "
[0:v]trim=start=0:end=4.038,setpts=PTS-STARTPTS[clip0];
[1:v]trim=start=2:end=4.038,setpts=PTS-STARTPTS[clip1];
[2:v]trim=start=2,setpts=PTS-STARTPTS[clip2];
[0:v]trim=start=5.038:end=6.038,setpts=PTS-STARTPTS[out0];
[1:v]trim=start=5.038:end=6.038,setpts=PTS-STARTPTS[out1];
[1:v]trim=start=0:end=2,setpts=PTS-STARTPTS[in1];
[2:v]trim=start=0:end=2,setpts=PTS-STARTPTS[in2];
[in1]format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1[fadein1];
[in2]format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1[fadein2];
[out0]format=pix_fmts=yuva420p,fade=t=out:st=0:d=2:alpha=1[fadeout0];
[out1]format=pix_fmts=yuva420p,fade=t=out:st=0:d=2:alpha=1[fadeout1];
[fadein1]fifo[fadein1fifo];[fadein2]fifo[fadein2fifo];
[fadeout0]fifo[fadeout0fifo];[fadeout1]fifo[fadeout1fifo];[fadeout0fifo]
[fadein1fifo]overlay[crossfade0];[fadeout1fifo]
[fadein2fifo]overlay[crossfade1];[clip0][crossfade0][clip1][crossfade1]
[clip2]concat=n=5[output]" -map "[output]" 
/tmp/media/final/some_filename_c8e898b2-e3f7-4656-b3b9-1e8fb93cd75c.mp4


    


    I would much appreciate any help because I am new to this tool and here I got stuck.

    


  • Ffmpeg integration without cmd ?

    27 août 2019, par forza1010

    I don’t want to use ffmpeg in command prompt. I want to integrate it into my code. So when I use my phone, to watch streams, it is to much time, to use some command line solutions. The live broadcast must be edited, befor the user reach it. Someone told me, that I should use ffmpeg as dll, but I dont know. What are my options ?

  • garbled audio when streaming to youtube using ffmpeg

    27 mai 2022, par skavish

    I am having some weird audio issues streaming to youtube using ffmpeg.

    


    The same stream on facebook and twitch is fine, but on youtube it has some garbling audio issues.

    


    Here is one of those streams : https://www.youtube.com/watch?v=zat4fhwFGUI

    


    Here is ffmpeg command which was used to stream this video. I removed input, output key and inserted newlines for readability.

    


    This command is streaming to youtube (last tee), to hls (first) and to mp4 (second). hls and mp4 do not have this audio issue. Also no issues if we add another tee to stream say to facebook as well.

    


    It happens only with youtube.

    


    I would appreciate any help or ideas on what is going on there. Thank you !

    


    ffmpeg -i XXXXXXXXXX -r 30 -preset ultrafast -tune zerolatency -threads 0 -vsync 1 -map 0:v -c:v libx264 -crf 23 -g 60.0 -sc_threshold 0 -keyint_min 60.0
-pix_fmt yuv420p -map 1:a:0 -c:a:0 aac -b:a:0 128k -ac 2 -ar 44100 -aq 0 -flags +global_header
-f tee
[f=hls:var_stream_map='v:0,a:0':select='v:0,a:0':hls_time=2.0:hls_playlist_type=event:
hls_flags=independent_segments+temp_file:master_pl_publish_rate=1:hls_segment_type=mpegts:hls_segment_filename=/tmp/10311326958150343888/stream_%v_%02d.ts:
master_pl_name=master.m3u8]/tmp/10311326958150343888/stream_%v.m3u8|

/tmp/10311326958150343888/stream.mp4|

[f=fifo:fifo_format=flv:recover_any_error=0:drop_pkts_on_overflow=1:attempt_recovery=1:recovery_wait_time=1:max_recovery_attempts=100:
onfail=ignore:format_opts=flvflags=no_duration_filesize]rtmp://a.rtmp.youtube.com/live2/xxxxxxxxxxxxxxx


    


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