[FFmpeg-user] Possible feature additions for concatenating video files

[dg1727 at hushmail.com]

On Thu, 12 Jan 2012 15:12:35 -0500 dg1727 at hushmail.com wrote:
>Here is the procedure that ended up working for me:  
>
>1.  Use "ffprobe -show_streams" to verify that the files have no B-
>frames.  
>2.  Open the first input file in Avidemux.  When prompted whether 
>to use a "safe mode" that works more reliably with B-frames but 
>loses frame accuracy, choose "Cancel" since there are no B-frames. 
>(Avidemux version 2.5.6 gave me this prompt; maybe the prompt will 
>be removed in future versions.)  
>3.  Leave the video and audio codecs at "Copy" and set the 
>container format to MP4.  
>4.  Use "Video > Frame Rate" to set the frame rate which will be 
>applied to the whole output file.  
>5.  Append the other input files (File > Append...).  
>6.  Save the resulting output file (Save > Save Video...).  

I have tried again without step 4; when I play the two output 
files, they seem identical.  So there doesn't seem to be a need for 
step 4 in the preceding list.  The revised procedure is:  

1.  Use "ffprobe -show_streams" to verify that the files have no B-
frames.  
2.  Open the first input file in Avidemux.  When prompted whether 
to use a "safe mode" that works more reliably with B-frames but 
loses frame accuracy, choose "Cancel" since there are no B-frames. 
(Avidemux version 2.5.6 gave me this prompt; maybe the prompt will 
be removed in future versions.)  
3.  Leave the video and audio codecs at "Copy" and set the 
container format to MP4.  
4.  Append the other input files (File > Append...).  
5.  Save the resulting output file (Save > Save Video...).