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Hope someone can help me. I'm using ffmpeg to extract the frames from an old video as images, batch enhancing and upscaling the images, then renecoding the images together with the original audio to a new video. This does work and the result looks and sounds correct, but I get this error/warning during the process

[image2 @ 0000022193c2e8c0] Thread message queue blocking; consider raising the thread_queue_size option

Since the output seems correct, I don't know if I need to worry about this or not. Does this message imply frames were dropped? Or is it just telling me I can read faster than I can write?

Everything I find about this online is from people doing real time encoding while streaming. I can understand a CPU may not keep up in that situation and drop some frames, but I'm encoding from files on disk to another file on disk. I would assume in this situation the program will just block the input threads till the output catches up, instead of dropping frames, but I'm not sure, which is why I ask here.

This only happens if I include audio copy in the same command. I'm copying from the same original video I made the frames from (which was encoded at 29.97 fps). I am outputting to a video of the same framerate (I think). Is there something I'm doing wrong here?

> ffmpeg.exe -f image2 -framerate ntsc -i %%06d.png -i D:\encode\original.avi -map 0:v:0 -map 1:a:0 -acodec copy -c:v libx265 -crf 28 -preset medium -pix_fmt yuv420p -r ntsc D:\encode\new.mkv

ffmpeg version 4.3.1-2020-11-19-full_build-www.gyan.dev Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 10.2.0 (Rev5, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, image2, from '%06d.png':
  Duration: 00:03:29.84, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: png, rgb24(pc), 1280x720, 29.97 fps, 29.97 tbr, 29.97 tbn, 29.97 tbc
Guessed Channel Layout for Input Stream #1.1 : stereo
Input #1, avi, from 'D:\encode\original.avi':
  Duration: 00:03:29.84, start: 0.000000, bitrate: 2202 kb/s
    Stream #1:0: Video: mpeg4 (DX50 / 0x30355844), yuv420p, 352x240 [SAR 1:1 DAR 22:15], 778 kb/s, 29.97 fps, 29.97 tbr, 29.97 tbn, 30k tbc
    Stream #1:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (png (native) -> hevc (libx265))
  Stream #1:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
x265 [info]: HEVC encoder version 3.4+27-g5163c32d7
x265 [info]: build info [Windows][GCC 10.2.0][64 bit] 8bit+10bit+12bit
x265 [info]: using cpu capabilities: MMX2 SSE2Fast LZCNT SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
x265 [info]: Main profile, Level-3.1 (Main tier)
x265 [info]: Thread pool created using 24 threads
x265 [info]: Slices                              : 1
x265 [info]: frame threads / pool features       : 4 / wpp(12 rows)
x265 [info]: Coding QT: max CU size, min CU size : 64 / 8
x265 [info]: Residual QT: max TU size, max depth : 32 / 1 inter / 1 intra
x265 [info]: ME / range / subpel / merge         : hex / 57 / 2 / 3
x265 [info]: Keyframe min / max / scenecut / bias  : 25 / 250 / 40 / 5.00
x265 [info]: Lookahead / bframes / badapt        : 20 / 4 / 2
x265 [info]: b-pyramid / weightp / weightb       : 1 / 1 / 0
x265 [info]: References / ref-limit  cu / depth  : 3 / off / on
x265 [info]: AQ: mode / str / qg-size / cu-tree  : 2 / 1.0 / 32 / 1
x265 [info]: Rate Control / qCompress            : CRF-28.0 / 0.60
x265 [info]: tools: rd=3 psy-rd=2.00 early-skip rskip mode=1 signhide tmvp
x265 [info]: tools: b-intra strong-intra-smoothing lslices=4 deblock sao
Output #0, matroska, to 'D:\encode\new.mkv':
  Metadata:
    encoder         : Lavf58.45.100
    Stream #0:0: Video: hevc (libx265), yuv420p, 1280x720, q=-1--1, 29.97 fps, 1k tbn, 29.97 tbc
    Metadata:
      encoder         : Lavc58.91.100 libx265
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
    Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s
[image2 @ 0000022193c2e8c0] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
frame= 6289 fps= 88 q=35.9 Lsize=   59028kB time=00:03:29.84 bitrate=2304.4kbits/s speed=2.92x
video:22746kB audio:36149kB subtitle:0kB other streams:0kB global headers:2kB muxing overhead: 0.226772%
x265 [info]: frame I:     34, Avg QP:28.64  kb/s: 2940.00
x265 [info]: frame P:   1520, Avg QP:30.35  kb/s: 1771.54
x265 [info]: frame B:   4735, Avg QP:33.71  kb/s: 588.33
x265 [info]: Weighted P-Frames: Y:3.4% UV:2.5%
x265 [info]: consecutive B-frames: 1.5% 0.6% 6.1% 75.2% 16.5%
 
encoded 6289 frames in 71.77s (87.63 fps), 887.02 kb/s, Avg QP:32.87

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