[FFmpeg-trac] #4354(undetermined:new): Big file size difference after using -c:v copy and -c:a copy

FFmpeg trac at avcodec.org
Sun Mar 29 15:56:19 CEST 2015

#4354: Big file size difference after using -c:v copy and -c:a copy
             Reporter:  Atarikid  |                    Owner:
                 Type:  defect    |                   Status:  new
             Priority:  normal    |                Component:  undetermined
              Version:  2.5.2     |               Resolution:
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |

Comment (by AndyF):

 Replying to [comment:4 Atarikid]:
 > That could only explain why the new new file is smaller. What about the
 changed bitrate?

 Above looks to me that the the bitrates are called for the whole ts.

 the last 2 ffmpeg -i outputs show "max 25000" for the actual mpeg2video

 I expect that the variable bitrates shown in the first output are accurate
 for the video stream. but nowhere else really contradicts them.

 When doing just ffmpeg -i infile bitrate estimations are just based on
 looking at a small bit of the start of the file, so the fact that the last
 output "19490" is less than the 19626.9 that is visible in the first
 output I expect is just due to that.

Ticket URL: <https://trac.ffmpeg.org/ticket/4354#comment:5>
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