使用FFmpeg拼接视频时遇Buffer queue overflow, dropping错误求助

Hey there! That buffer overflow error pops up when different parts of your FFmpeg filter graph can't sync up their processing speeds—some branches generate frames/audio faster than others can consume them, leading to dropped data. You're right that fifo fixes this for video, and for audio we have afifo to handle the same queueing issue. Let's adjust your command properly:

Modified FFmpeg Command #

ffmpeg -i /tmp/media/import-2020-Aug-19-Wednesday-08-08-26/temp_eba59811-bb5c-4e36-aa7d-b1731e70432c.mp4 \
-i /tmp/media/import-2020-Aug-19-Wednesday-08-08-26/temp_2a6d7907-7cad-4f38-ae82-4b475546d3e0.mp4 \
-i /tmp/media/import-2020-Aug-19-Wednesday-08-08-26/temp_d7371ecb-01df-4199-951f-336fa475998f.mp4 \
-i /tmp/media/import-2020-Aug-19-Wednesday-08-08-26/temp_cc5de0f1-84b4-47bc-b390-45b5f8711914.mp4 \
-i /tmp/media/import-2020-Aug-19-Wednesday-08-08-26/temp_bf796e0d-135f-40fd-ab8e-4780da6973fd.mp4 \
-filter_complex "
[0:v]trim=start=0:end=8.032,setpts=PTS-STARTPTS,fifo[clip0]; 
[1:v]trim=start=2:end=13.047,setpts=PTS-STARTPTS,fifo[clip1]; 
[2:v]trim=start=2:end=13.558,setpts=PTS-STARTPTS,fifo[clip2]; 
[3:v]trim=start=2:end=13.186,setpts=PTS-STARTPTS,fifo[clip3]; 
[4:v]trim=start=2,setpts=PTS-STARTPTS,fifo[clip4]; 

[0:v]trim=start=9.032:end=10.032,setpts=PTS-STARTPTS,fifo[out0]; 
[1:v]trim=start=14.047:end=15.047,setpts=PTS-STARTPTS,fifo[out1]; 
[2:v]trim=start=14.558:end=15.558,setpts=PTS-STARTPTS,fifo[out2]; 
[3:v]trim=start=14.186:end=15.186,setpts=PTS-STARTPTS,fifo[out3]; 

[1:v]trim=start=0:end=2,setpts=PTS-STARTPTS,fifo[in1]; 
[2:v]trim=start=0:end=2,setpts=PTS-STARTPTS,fifo[in2]; 
[3:v]trim=start=0:end=2,setpts=PTS-STARTPTS,fifo[in3]; 
[4:v]trim=start=0:end=2,setpts=PTS-STARTPTS,fifo[in4]; 

[in1]format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1,fifo[fadein1]; 
[in2]format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1,fifo[fadein2]; 
[in3]format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1,fifo[fadein3]; 
[in4]format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1,fifo[fadein4]; 

[out0]format=pix_fmts=yuva420p,fade=t=out:st=0:d=2:alpha=1,fifo[fadeout0]; 
[out1]format=pix_fmts=yuva420p,fade=t=out:st=0:d=2:alpha=1,fifo[fadeout1]; 
[out2]format=pix_fmts=yuva420p,fade=t=out:st=0:d=2:alpha=1,fifo[fadeout2]; 
[out3]format=pix_fmts=yuva420p,fade=t=out:st=0:d=2:alpha=1,fifo[fadeout3]; 

[fadeout0][fadein1]overlay,fifo[crossfade0]; 
[fadeout1][fadein2]overlay,fifo[crossfade1]; 
[fadeout2][fadein3]overlay,fifo[crossfade2]; 
[fadeout3][fadein4]overlay,fifo[crossfade3]; 

[clip0][crossfade0][clip1][crossfade1][clip2][crossfade2][clip3][crossfade3][clip4]concat=n=9[output]; 

[0:a]afifo[a0]; [1:a]afifo[a1]; [2:a]afifo[a2]; [3:a]afifo[a3]; [4:a]afifo[a4];
[a0][a1]acrossfade=d=10:c1=tri:c2=tri,afifo[A1]; 
[A1][a2]acrossfade=d=10:c1=tri:c2=tri,afifo[A2]; 
[A2][a3]acrossfade=d=10:c1=tri:c2=tri,afifo[A3]; 
[A3][a4]acrossfade=d=10:c1=tri:c2=tri[audio]" \
-map "[output]" -map "[audio]" /tmp/media/final/some_filename_587463a2-e3ca-436a-874b-a72e295e46ac.mp4

Key Changes Explained #

• Video Streams: Added fifo right after every setpts and overlay operation. These buffers act as temporary storage, ensuring slower downstream filters don't get swamped by faster upstream processing. Even if you had some fifo before, adding them at every critical branch point eliminates bottlenecks across the entire filter graph.
• Audio Streams: Used afifo (the audio equivalent of fifo) for each input audio stream and after every acrossfade. Long crossfade durations can easily cause audio queue overflow, so these buffers keep audio sync stable and prevent data drops.

This setup balances the speed of all processing branches, so FFmpeg no longer needs to drop frames/audio to keep up. Your crossfade and concat logic stays intact while fixing the error.

内容的提问来源于stack exchange，提问作者Yevhenii Molodtsov