[FFmpeg-trac] #8774(undetermined:open): "Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)" error message

FFmpeg trac at avcodec.org
Sun Jul 5 16:08:22 EEST 2020

#8774: "Output file is empty, nothing was encoded (check -ss / -t / -frames
parameters if used)" error message
             Reporter:               |                    Owner:
  Mohammed.Bey                       |  Mohammed.Bey
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  v4l2m2m      |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |

Comment (by Mohammed.Bey):

 Replying to [comment:6 taliho]:
 > - Can you confirm that you applied this patch before decoding the 720p
 > And that the patch fixes a seg fault? (this is how I understand the ML
 Yes. I applied the patch before compiling ffmpeg. I think it works since
 the error of " free(): double free detected in tcache 2" has disappeared.

 > - Please post console output with -loglevel debug option set. Post the
 log for the case that works and when it doesn't work.
 Attached are the outputs:
 --------- 1- when it works (2160p)  --------------------------------------
 "output_loglevel_debug_ffmpeg_4_3_resolution_2160p.txt" file.

 -------- 2- when it does not work (720p)  --------------------------------
 "output_loglevel_debug_ffmpeg_4_3_resolution_720p.txt" file.

 > - Did release 3.4.7 ever work when decoding the 720p stream?
 No. I re-compiled ffmpeg-3.4.8 (the latest stable version of 3.4).
 Attached are the command line and the output:
 "output_loglevel_debug_ffmpeg_3_4_8_720p.txt" file.

 > - Please check output of dmesg when decoding fails and post the results
 if they contain error messages from the driver
 "dmesg" output is in the
 "output_loglevel_debug_ffmpeg_4_3_resolution_720p.txt" attached file.

Ticket URL: <https://trac.ffmpeg.org/ticket/8774#comment:7>
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