#5856: filter_complex significantly slower than -vf for the same task. -------------------------------------+------------------------------------- Reporter: Zibri | Type: defect Status: new | Priority: important Component: | Version: undetermined | unspecified Keywords: | Blocked By: vf,filter_complex,speed,bitrate | Reproduced by developer: 0 Blocking: | Analyzed by developer: 0 | -------------------------------------+------------------------------------- To record from webcam and microphone and overlay a resized logo, using complex_filter I achieve about 20fps (on a fast pc with less than 15% cpu load), using the same features but with -vf I get full realtime 30fps... I know this is normal because the complex filter has more options and it's more flexible, but IMHO this should not happen... Example: Record live feed from webcam and microphone, overlay a logo and save to flv.. ffmpeg -f dshow -video_size qpal -rtbufsize 1G -copyts -framerate 30 -i video="BisonCam, NB Pro" -i "C:\Users\Zibri\Downloads\scdc.png" -filter_complex "[1]scale=80x60,[0]overlay=W-w-5:H-h-5" -f dshow -i audio="Microphone (Realtek High Definition Audio)" -codec:v libx264 -preset fast -b:v 500k -b:a 128k -minrate 500k -maxrate 500k -bufsize 1500k -f flv test7.flv result: {{{ ffmpeg version N-81696-gd38dff8e Copyright (c) 2000-2016 the FFmpeg developers built with gcc 5.4.0 (GCC) configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable- bzlib --enable-libebur128 --enable-fontconfig --enable-frei0r --enable- gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable- libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable- libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo- amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable- libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable- libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib libavutil 55. 29.100 / 55. 29.100 libavcodec 57. 57.100 / 57. 57.100 libavformat 57. 49.100 / 57. 49.100 libavdevice 57. 0.102 / 57. 0.102 libavfilter 6. 62.100 / 6. 62.100 libswscale 4. 1.100 / 4. 1.100 libswresample 2. 1.100 / 2. 1.100 libpostproc 54. 0.100 / 54. 0.100 Input #0, dshow, from 'video=BisonCam, NB Pro': Duration: N/A, start: 128270.189000, bitrate: N/A Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj422p(pc, bt470bg/unknown/unknown), 352x288, 30 fps, 30 tbr, 10000k tbn, 10000k tbc Input #1, png_pipe, from 'C:\Users\Zibri\Downloads\scdc.png': Duration: N/A, bitrate: N/A Stream #1:0: Video: png, rgba(pc), 244x224 [SAR 5905:5905 DAR 61:56], 25 tbr, 25 tbn, 25 tbc Guessed Channel Layout for Input Stream #2.0 : stereo Input #2, dshow, from 'audio=Microphone (Realtek High Definition Audio)': Duration: N/A, start: 128270.631000, bitrate: 1411 kb/s Stream #2:0: Audio: pcm_s16le, 44100 Hz, 2 channels, s16, 1411 kb/s File 'test7.flv' already exists. Overwrite ? [y/N] y [swscaler @ 00000000074504a0] deprecated pixel format used, make sure you did set range correctly No pixel format specified, yuvj420p for H.264 encoding chosen. Use -pix_fmt yuv420p for compatibility with outdated media players. [libx264 @ 0000000002627c00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2 [libx264 @ 0000000002627c00] profile High, level 1.3 [libx264 @ 0000000002627c00] 264 - core 148 r2705 3f5ed56 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=1 ref=2 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=6 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=9 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=1 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=30 rc=cbr mbtree=1 bitrate=500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=500 vbv_bufsize=1500 nal_hrd=none filler=0 ip_ratio=1.40 aq=1:1.00 [flv @ 00000000026ae8e0] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead. Last message repeated 1 times Output #0, flv, to 'test7.flv': Metadata: encoder : Lavf57.49.100 Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuvj420p(pc), 352x288, q=-1--1, 500 kb/s, 30 fps, 1k tbn, 30 tbc (default) Metadata: encoder : Lavc57.57.100 libx264 Side data: cpb: bitrate max/min/avg: 500000/0/500000 buffer size: 1500000 vbv_delay: -1 Stream #0:1: Audio: mp3 (libmp3lame) ([2][0][0][0] / 0x0002), 44100 Hz, stereo, s16p, 128 kb/s Metadata: encoder : Lavc57.57.100 libmp3lame Stream mapping: Stream #0:0 (mjpeg) -> overlay:main (graph 0) Stream #1:0 (png) -> scale (graph 0) overlay (graph 0) -> Stream #0:0 (libx264) Stream #2:0 -> #0:1 (pcm_s16le (native) -> mp3 (libmp3lame)) Press [q] to stop, [?] for help [dshow @ 00000000025c2cc0] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8) frame= 43 fps=0.0 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A speed= frame= 51 fps= 50 q=22.0 size= 50kB time=35:37:51.02 bitrate= 0.0kbits/frame= 58 fps= 38 q=24.0 size= 84kB time=35:37:51.53 bitrate= 0.0kbits/frame= 66 fps= 33 q=24.0 size= 124kB time=35:37:52.03 bitrate= 0.0kbits/frame= 74 fps= 29 q=23.0 size= 159kB time=35:37:52.52 bitrate= 0.0kbits/frame= 81 fps= 27 q=22.0 size= 188kB time=35:37:53.02 bitrate= 0.0kbits/frame= 89 fps= 25 q=23.0 size= 228kB time=35:37:53.51 bitrate= 0.0kbits/frame= 96 fps= 24 q=23.0 size= 265kB time=35:37:54.01 bitrate= 0.0kbits/frame= 104 fps= 23 q=22.0 size= 304kB time=35:37:54.53 bitrate= 0.0kbits/frame= 111 fps= 22 q=22.0 size= 335kB time=35:37:55.03 bitrate= 0.0kbits/frame= 119 fps= 21 q=21.0 size= 372kB time=35:37:55.52 bitrate= 0.0kbits/frame= 126 fps= 21 q=22.0 size= 407kB time=35:37:56.02 bitrate= 0.0kbits/frame= 134 fps= 20 q=22.0 size= 446kB time=35:37:56.52 bitrate= 0.0kbits/frame= 141 fps= 20 q=22.0 size= 481kB time=35:37:57.01 bitrate= 0.0kbits/frame= 149 fps= 20 q=22.0 size= 521kB time=35:37:57.51 bitrate= 0.0kbits/frame= 157 fps= 19 q=22.0 size= 561kB time=35:37:58.03 bitrate= 0.0kbits/frame= 164 fps= 19 q=22.0 size= 593kB time=35:37:58.53 bitrate= 0.0kbits/frame= 172 fps= 19 q=22.0 size= 633kB time=35:37:59.02 bitrate= 0.0kbits/frame= 179 fps= 19 q=22.0 size= 670kB time=35:37:59.52 bitrate= 0.0kbits/frame= 187 fps= 19 q=22.0 size= 711kB time=35:38:00.02 bitrate= 0.0kbits/frame= 194 fps= 18 q=22.0 size= 746kB time=35:38:00.51 bitrate= 0.0kbits/frame= 202 fps= 18 q=22.0 size= 786kB time=35:38:01.01 bitrate= 0.1kbits/frame= 210 fps= 18 q=22.0 size= 825kB time=35:38:01.53 bitrate= 0.1kbits/frame= 217 fps= 18 q=23.0 size= 862kB time=35:38:02.03 bitrate= 0.1kbits/frame= 225 fps= 18 q=23.0 size= 905kB time=35:38:02.53 bitrate= 0.1kbits/frame= 232 fps= 18 q=20.0 size= 936kB time=35:38:03.02 bitrate= 0.1kbits/frame= 240 fps= 18 q=24.0 size= 980kB time=35:38:03.52 bitrate= 0.1kbits/frame= 247 fps= 17 q=24.0 size= 1024kB time=35:38:04.01 bitrate= 0.1kbits/frame= 255 fps= 17 q=24.0 size= 1067kB time=35:38:04.51 bitrate= 0.1kbits/frame= 263 fps= 17 q=24.0 size= 1111kB time=35:38:05.03 bitrate= 0.1kbits/frame= 270 fps= 17 q=23.0 size= 1152kB time=35:38:05.53 bitrate= 0.1kbits/frame= 278 fps= 17 q=23.0 size= 1195kB time=35:38:06.03 bitrate= 0.1kbits/frame= 285 fps= 17 q=24.0 size= 1231kB time=35:38:06.52 bitrate= 0.1kbits/frame= 293 fps= 17 q=24.0 size= 1267kB time=35:38:07.02 bitrate= 0.1kbits/frame= 301 fps= 17 q=23.0 size= 1320kB time=35:38:07.52 bitrate= 0.1kbits/frame= 308 fps= 17 q=24.0 size= 1358kB time=35:38:08.01 bitrate= 0.1kbits/frame= 316 fps= 17 q=24.0 size= 1396kB time=35:38:08.53 bitrate= 0.1kbits/frame= 323 fps= 17 q=23.0 size= 1427kB time=35:38:09.03 bitrate= 0.1kbits/frame= 331 fps= 17 q=23.0 size= 1462kB time=35:38:09.53 bitrate= 0.1kbits/frame= 338 fps= 17 q=23.0 size= 1494kB time=35:38:10.02 bitrate= 0.1kbits/frame= 346 fps= 17 q=24.0 size= 1536kB time=35:38:10.52 bitrate= 0.1kbits/frame= 353 fps= 17 q=23.0 size= 1572kB time=35:38:11.01 bitrate= 0.1kbits/frame= 361 fps= 17 q=23.0 size= 1617kB time=35:38:11.51 bitrate= 0.1kbits/frame= 369 fps= 17 q=24.0 size= 1663kB time=35:38:12.03 bitrate= 0.1kbits/frame= 376 fps= 17 q=24.0 size= 1701kB time=35:38:12.53 bitrate= 0.1kbits/frame= 384 fps= 17 q=23.0 size= 1743kB time=35:38:13.03 bitrate= 0.1kbits/frame= 391 fps= 16 q=23.0 size= 1772kB time=35:38:13.52 bitrate= 0.1kbits/frame= 399 fps= 16 q=23.0 size= 1810kB time=35:38:14.02 bitrate= 0.1kbits/frame= 406 fps= 16 q=23.0 size= 1842kB time=35:38:14.52 bitrate= 0.1kbits/frame= 414 fps= 16 q=23.0 size= 1885kB time=35:38:15.01 bitrate= 0.1kbits/frame= 422 fps= 16 q=23.0 size= 1926kB time=35:38:15.54 bitrate= 0.1kbits/frame= 429 fps= 16 q=23.0 size= 1972kB time=35:38:16.03 bitrate= 0.1kbits/frame= 437 fps= 16 q=23.0 size= 2015kB time=35:38:16.53 bitrate= 0.1kbits/frame= 444 fps= 16 q=23.0 size= 2053kB time=35:38:17.02 bitrate= 0.1kbits/frame= 452 fps= 16 q=22.0 size= 2090kB time=35:38:17.52 bitrate= 0.1kbits/frame= 460 fps= 16 q=22.0 size= 2125kB time=35:38:18.02 bitrate= 0.1kbits/frame= 467 fps= 16 q=21.0 size= 2157kB time=35:38:18.51 bitrate= 0.1kbits/frame= 475 fps= 16 q=22.0 size= 2197kB time=35:38:19.03 bitrate= 0.1kbits/frame= 482 fps= 16 q=22.0 size= 2229kB time=35:38:19.53 bitrate= 0.1kbits/frame= 490 fps= 16 q=22.0 size= 2268kB time=35:38:20.03 bitrate= 0.1kbits/frame= 497 fps= 16 q=22.0 size= 2304kB time=35:38:20.52 bitrate= 0.1kbits/frame= 505 fps= 16 q=22.0 size= 2344kB time=35:38:21.02 bitrate= 0.1kbits/frame= 513 fps= 16 q=22.0 size= 2383kB time=35:38:21.52 bitrate= 0.2kbits/frame= 520 fps= 16 q=22.0 size= 2417kB time=35:38:22.01 bitrate= 0.2kbits/frame= 528 fps= 16 q=22.0 size= 2456kB time=35:38:22.53 bitrate= 0.2kbits/frame= 535 fps= 16 q=22.0 size= 2490kB time=35:38:23.03 bitrate= 0.2kbits/frame= 543 fps= 16 q=23.0 size= 2526kB time=35:38:23.53 bitrate= 0.2kbits/frame= 550 fps= 16 q=22.0 size= 2579kB time=35:38:24.03 bitrate= 0.2kbits/frame= 558 fps= 16 q=22.0 size= 2618kB time=35:38:24.52 bitrate= 0.2kbits/frame= 566 fps= 16 q=22.0 size= 2657kB time=35:38:25.02 bitrate= 0.2kbits/frame= 573 fps= 16 q=22.0 size= 2691kB time=35:38:25.51 bitrate= 0.2kbits/frame= 581 fps= 16 q=22.0 size= 2730kB time=35:38:26.01 bitrate= 0.2kbits/frame= 588 fps= 16 q=22.0 size= 2762kB time=35:38:26.53 bitrate= 0.2kbits/frame= 596 fps= 16 q=22.0 size= 2801kB time=35:38:27.03 bitrate= 0.2kbits/frame= 604 fps= 16 q=22.0 size= 2840kB time=35:38:27.52 bitrate= 0.2kbits/frame= 611 fps= 16 q=22.0 size= 2875kB time=35:38:28.02 bitrate= 0.2kbits/frame= 619 fps= 16 q=22.0 size= 2915kB time=35:38:28.52 bitrate= 0.2kbits/frame= 626 fps= 16 q=22.0 size= 2952kB time=35:38:29.01 bitrate= 0.2kbits/frame= 634 fps= 16 q=22.0 size= 2991kB time=35:38:29.51 bitrate= 0.2kbits/frame= 641 fps= 16 q=21.0 size= 3025kB time=35:38:30.03 bitrate= 0.2kbits/frame= 649 fps= 16 q=24.0 size= 3066kB time=35:38:30.53 bitrate= 0.2kbits/frame= 650 fps= 16 q=-1.0 Lsize= 3252kB time=35:38:33.37 bitrate= 0.2kbits/s speed=3.08e+003x }}} Same command using -vf ffmpeg -f dshow -video_size qpal -rtbufsize 1G -copyts -framerate 30 -i video="BisonCam, NB Pro" -f dshow -i audio="Microphone (Realtek High Definition Audio)" -vf "movie=scdc.png,scale=80x60 [watermark];[in][watermark] overlay=main_w-overlay_w-5:main_h- overlay_h-5,fps=30 [out]" -codec:v libx264 -preset slow -b:v 500k -b:a 128k -minrate 500k -maxrate 500k -bufsize 1500k -f flv test8.flv Result: {{{ ffmpeg version N-81696-gd38dff8e Copyright (c) 2000-2016 the FFmpeg developers built with gcc 5.4.0 (GCC) configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable- bzlib --enable-libebur128 --enable-fontconfig --enable-frei0r --enable- gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable- libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable- libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo- amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable- libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable- libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib libavutil 55. 29.100 / 55. 29.100 libavcodec 57. 57.100 / 57. 57.100 libavformat 57. 49.100 / 57. 49.100 libavdevice 57. 0.102 / 57. 0.102 libavfilter 6. 62.100 / 6. 62.100 libswscale 4. 1.100 / 4. 1.100 libswresample 2. 1.100 / 2. 1.100 libpostproc 54. 0.100 / 54. 0.100 Input #0, dshow, from 'video=BisonCam, NB Pro': Duration: N/A, start: 127887.407000, bitrate: N/A Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj422p(pc, bt470bg/unknown/unknown), 352x288, 30 fps, 30 tbr, 10000k tbn, 10000k tbc Guessed Channel Layout for Input Stream #1.0 : stereo Input #1, dshow, from 'audio=Microphone (Realtek High Definition Audio)': Duration: N/A, start: 127887.822000, bitrate: 1411 kb/s Stream #1:0: Audio: pcm_s16le, 44100 Hz, 2 channels, s16, 1411 kb/s [swscaler @ 00000000081166e0] deprecated pixel format used, make sure you did set range correctly No pixel format specified, yuvj420p for H.264 encoding chosen. Use -pix_fmt yuv420p for compatibility with outdated media players. [libx264 @ 00000000024efba0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2 [libx264 @ 00000000024efba0] profile High, level 1.3 [libx264 @ 00000000024efba0] 264 - core 148 r2705 3f5ed56 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=1 ref=5 deblock=1:0:0 analyse=0x3:0x113 me=umh subme=8 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=9 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=cbr mbtree=1 bitrate=500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=500 vbv_bufsize=1500 nal_hrd=none filler=0 ip_ratio=1.40 aq=1:1.00 [flv @ 00000000080fbae0] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead. Last message repeated 1 times Output #0, flv, to 'test8.flv': Metadata: encoder : Lavf57.49.100 Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuvj420p(pc), 352x288, q=-1--1, 500 kb/s, 30 fps, 1k tbn, 30 tbc Metadata: encoder : Lavc57.57.100 libx264 Side data: cpb: bitrate max/min/avg: 500000/0/500000 buffer size: 1500000 vbv_delay: -1 Stream #0:1: Audio: mp3 (libmp3lame) ([2][0][0][0] / 0x0002), 44100 Hz, stereo, s16p, 128 kb/s Metadata: encoder : Lavc57.57.100 libmp3lame Stream mapping: Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264)) Stream #1:0 -> #0:1 (pcm_s16le (native) -> mp3 (libmp3lame)) Press [q] to stop, [?] for help [dshow @ 00000000024b2cc0] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8) frame= 42 fps=0.0 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A speed= frame= 58 fps= 57 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A speed= frame= 74 fps= 48 q=28.0 size= 35kB time=35:31:28.21 bitrate= 0.0kbits/frame= 88 fps= 43 q=25.0 size= 54kB time=35:31:28.21 bitrate= 0.0kbits/frame= 104 fps= 41 q=25.0 size= 91kB time=35:31:28.72 bitrate= 0.0kbits/frame= 118 fps= 39 q=26.0 size= 130kB time=35:31:29.22 bitrate= 0.0kbits/frame= 134 fps= 38 q=26.0 size= 172kB time=35:31:29.71 bitrate= 0.0kbits/frame= 148 fps= 36 q=23.0 size= 203kB time=35:31:30.21 bitrate= 0.0kbits/frame= 164 fps= 36 q=23.0 size= 242kB time=35:31:30.70 bitrate= 0.0kbits/frame= 180 fps= 35 q=23.0 size= 281kB time=35:31:31.72 bitrate= 0.0kbits/frame= 194 fps= 35 q=23.0 size= 316kB time=35:31:31.72 bitrate= 0.0kbits/frame= 210 fps= 34 q=23.0 size= 358kB time=35:31:32.72 bitrate= 0.0kbits/frame= 226 fps= 34 q=23.0 size= 398kB time=35:31:33.21 bitrate= 0.0kbits/frame= 240 fps= 34 q=25.0 size= 436kB time=35:31:33.71 bitrate= 0.0kbits/frame= 256 fps= 34 q=23.0 size= 476kB time=35:31:34.20 bitrate= 0.0kbits/frame= 272 fps= 33 q=24.0 size= 519kB time=35:31:34.70 bitrate= 0.0kbits/frame= 286 fps= 33 q=24.0 size= 555kB time=35:31:35.22 bitrate= 0.0kbits/frame= 302 fps= 33 q=24.0 size= 596kB time=35:31:35.72 bitrate= 0.0kbits/frame= 316 fps= 33 q=24.0 size= 650kB time=35:31:36.22 bitrate= 0.0kbits/frame= 332 fps= 33 q=25.0 size= 692kB time=35:31:36.71 bitrate= 0.0kbits/frame= 346 fps= 32 q=24.0 size= 725kB time=35:31:37.21 bitrate= 0.0kbits/frame= 362 fps= 32 q=23.0 size= 764kB time=35:31:37.70 bitrate= 0.0kbits/frame= 378 fps= 32 q=23.0 size= 802kB time=35:31:38.20 bitrate= 0.1kbits/frame= 392 fps= 32 q=23.0 size= 836kB time=35:31:38.72 bitrate= 0.1kbits/frame= 408 fps= 32 q=24.0 size= 875kB time=35:31:39.22 bitrate= 0.1kbits/frame= 424 fps= 32 q=25.0 size= 915kB time=35:31:39.72 bitrate= 0.1kbits/frame= 438 fps= 32 q=25.0 size= 951kB time=35:31:40.21 bitrate= 0.1kbits/frame= 455 fps= 32 q=26.0 size= 1001kB time=35:31:40.71 bitrate= 0.1kbits/frame= 468 fps= 32 q=26.0 size= 1040kB time=35:31:41.20 bitrate= 0.1kbits/frame= 484 fps= 32 q=25.0 size= 1090kB time=35:31:41.70 bitrate= 0.1kbits/frame= 498 fps= 32 q=25.0 size= 1130kB time=35:31:42.22 bitrate= 0.1kbits/frame= 515 fps= 32 q=26.0 size= 1181kB time=35:31:42.72 bitrate= 0.1kbits/frame= 530 fps= 32 q=26.0 size= 1218kB time=35:31:43.22 bitrate= 0.1kbits/frame= 544 fps= 32 q=26.0 size= 1253kB time=35:31:43.71 bitrate= 0.1kbits/frame= 559 fps= 32 q=26.0 size= 1289kB time=35:31:44.21 bitrate= 0.1kbits/frame= 575 fps= 32 q=25.0 size= 1343kB time=35:31:44.70 bitrate= 0.1kbits/frame= 590 fps= 31 q=26.0 size= 1379kB time=35:31:45.20 bitrate= 0.1kbits/frame= 605 fps= 31 q=24.0 size= 1415kB time=35:31:45.72 bitrate= 0.1kbits/frame= 621 fps= 31 q=25.0 size= 1451kB time=35:31:46.22 bitrate= 0.1kbits/frame= 635 fps= 31 q=25.0 size= 1485kB time=35:31:46.72 bitrate= 0.1kbits/frame= 651 fps= 31 q=24.0 size= 1520kB time=35:31:47.21 bitrate= 0.1kbits/frame= 665 fps= 31 q=26.0 size= 1555kB time=35:31:47.71 bitrate= 0.1kbits/frame= 681 fps= 31 q=23.0 size= 1589kB time=35:31:48.21 bitrate= 0.1kbits/frame= 696 fps= 31 q=26.0 size= 1624kB time=35:31:48.70 bitrate= 0.1kbits/frame= 711 fps= 31 q=23.0 size= 1664kB time=35:31:49.22 bitrate= 0.1kbits/frame= 727 fps= 31 q=23.0 size= 1706kB time=35:31:49.72 bitrate= 0.1kbits/frame= 741 fps= 31 q=24.0 size= 1747kB time=35:31:50.22 bitrate= 0.1kbits/frame= 757 fps= 31 q=24.0 size= 1788kB time=35:31:50.71 bitrate= 0.1kbits/frame= 771 fps= 31 q=-1.0 Lsize= 1964kB time=35:31:53.00 bitrate= 0.1kbits/s speed=5.08e+003x }}} The fisrt command settles after a few minutes around 10-15 fps. The second one stays steady at 30 fps (camera is 30fps). Note the bitrate is also broken and showing wrong. Another note: when playing with ffplay I get normal video in both cases... and ffplay says it's 30fps anso "test7" which as you saw goes down to 16 when recording.. {{{ ffplay test7.flv ffplay version N-81696-gd38dff8e Copyright (c) 2003-2016 the FFmpeg developers built with gcc 5.4.0 (GCC) configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable- bzlib --enable-libebur128 --enable-fontconfig --enable-frei0r --enable- gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable- libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable- libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo- amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable- libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable- libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib libavutil 55. 29.100 / 55. 29.100 libavcodec 57. 57.100 / 57. 57.100 libavformat 57. 49.100 / 57. 49.100 libavdevice 57. 0.102 / 57. 0.102 libavfilter 6. 62.100 / 6. 62.100 libswscale 4. 1.100 / 4. 1.100 libswresample 2. 1.100 / 2. 1.100 libpostproc 54. 0.100 / 54. 0.100 [flv @ 000000000068cf20] video stream discovered after head already parsed [flv @ 000000000068cf20] audio stream discovered after head already parsed Input #0, flv, from 'test7.flv': Metadata: encoder : Lavf57.49.100 Duration: 00:00:43.47, start: 128270.205000, bitrate: 612 kb/s Stream #0:0: Video: h264 (High), yuvj420p(pc), 352x288, 30.30 fps, 15 tbr, 1k tbn, 60 tbc Stream #0:1: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s [swscaler @ 0000000003697f80] deprecated pixel format used, make sure you did set range correctly 128310.59 A-V:-27.441 fd= 4 aq= 0KB vq= 0KB sq= 0B f=0/0 }}} and this is ffplay output for test8.flv (which encoded at 30fps) {{{ ffplay test8.flv ffplay version N-81696-gd38dff8e Copyright (c) 2003-2016 the FFmpeg developers built with gcc 5.4.0 (GCC) configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable- bzlib --enable-libebur128 --enable-fontconfig --enable-frei0r --enable- gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable- libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable- libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo- amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable- libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable- libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib libavutil 55. 29.100 / 55. 29.100 libavcodec 57. 57.100 / 57. 57.100 libavformat 57. 49.100 / 57. 49.100 libavdevice 57. 0.102 / 57. 0.102 libavfilter 6. 62.100 / 6. 62.100 libswscale 4. 1.100 / 4. 1.100 libswresample 2. 1.100 / 2. 1.100 libpostproc 54. 0.100 / 54. 0.100 [flv @ 000000000002cf20] video stream discovered after head already parsed [flv @ 000000000002cf20] audio stream discovered after head already parsed Input #0, flv, from 'test8.flv': Metadata: encoder : Lavf57.49.100 Duration: 00:00:25.77, start: 127887.400000, bitrate: 624 kb/s Stream #0:0: Video: h264 (High), yuvj420p(pc), 352x288, 30.30 fps, 30 tbr, 1k tbn, 60 tbc Stream #0:1: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s [swscaler @ 00000000032eec40] deprecated pixel format used, make sure you did set range correctly 127911.28 A-V: -7.358 fd= 10 aq= 0KB vq= 0KB sq= 0B f=0/0 }}} And here is ffprobe output: {{{ C:\>ffprobe -v error -select_streams v:0 -show_entries stream=avg_frame_rate -of default=noprint_wrappers=1:nokey=1 test7.flv 1000/33 C:\>ffprobe -v error -select_streams v:0 -show_entries stream=avg_frame_rate -of default=noprint_wrappers=1:nokey=1 test8.flv 1000/33 }}} Can you explain this behaviour and why the fps is so different while recording? -- Ticket URL: <https://trac.ffmpeg.org/ticket/5856> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker