[FFmpeg-devel] [PATCH] ffmpeg_filter: initialize sub2video.end_pts together with last_pts

[Jan Ekström]

This fixes buffering of samples which causes sudden ballooning of
memory usage in case of no subtitle samples coming in for a while if
the filter chain had been re-initialized.

You can also see messages a la:
"Error while add the frame to buffer source(Invalid argument)."
disappearing after filter chain re-initializations.

Passes fate-sub2video.

Example (memory usage before patch around 700+ MiB, after around 150MiB) :
/usr/bin/time -v ffmpeg -v verbose \
  -i "https://megumin.fushizen.eu/samples/2019-01-18-audio_reconfig_causes_buffer_growth.ts"
\
  -filter_complex
'[0:v:0]yadif=deint=interlaced[yadif_out];[yadif_out][0:s:0]overlay=eof_action=pass:repeatlast=0[overlay_out];[overlay_out]scale=1024:-2[video_out];[0:a:0]aresample=48000:async=1,aformat=channel_layouts=stereo[filtered_audio]'
\
  -map "[video_out]" \
    -c:v mpeg4 \
    -b:v 750k \
  -map "[filtered_audio]" \
    -c:a aac \
    -b:a 192k \
  "test.mp4"

Best regards,
Jan
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