[FFmpeg-trac] #4037(undetermined:new): [Transcoding] Duration and frame number changed after transcoding

FFmpeg trac at avcodec.org
Mon Oct 20 11:07:35 CEST 2014

#4037: [Transcoding] Duration and frame number changed after transcoding
             Reporter:  hungnv       |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  mpegts       |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0

Comment (by hungnv):

 Source file:

 Command to split to ts in step 1 I mentioned:
 /usr/local/bin/ffmpeg -i Vetmua.mp4  -codec:v libx264 -b:v 750000 -g 25.0
 -keyint_min 50 -x264opts keyint=50:min-keyint=50:no-scenecut -codec:a aac
 -strict -2 -map 0:v -map 0:a -f ssegment -segment_list playlist.m3u8
 -segment_time 5 -segment_format mpegts streams/stream%4d.ts
 This playlist (playlist.m3u8) play well, no distortion.

 Go to step 2,
 2.1 # for i in *.ts; do /usr/local/bin/ffmpeg -y -i $i -vcodec libx264 -vb
 500000 -s 640x360 -f mpegts -aspect 16:9 -g 25 -keyint_min 50 -vf
 scale=640:-1 ../transcode_streams/$i ; done
 2.2 cp playlist.m3u8 ../transcode_streams/

 Now play playlist.m3u8 with transcoded stream --> distortion. Actually I
 dont know how to name it right, it means, in playlist 1, file was not
 transcode, stream0000.ts and stream0001.ts are continuous, bit if we
 transcode them, it's not continuous anymore.

Ticket URL: <https://trac.ffmpeg.org/ticket/4037#comment:14>
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