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Prevent ffmpeg from changing the intensity of colors while downscaling the resolution of the video
29 août 2022, par dravitI have a use case where I need to downscale a
716x1280mp4 video to358x640(half of the original). Command that I used is

ffmpeg -i ./input.mp4 -vf "scale=640:640:force_original_aspect_ratio=decrease,pad=ceil(iw/2)*2:ceil(ih/2)*2" ./output.mp4


Out of 10 sample videos, 2 of the them suffered impact on colors. Below I have attached a comparison from the one which was impacted the most.




NOTE : The one on the right is a frame from the original video and the frame on the left is the one from the processed (down scaled) video. Notice the colors red and green in the image (even the skin color and hair color were changed).


What I am looking for is


- 

- Is there any way I can prevent changes like these happening ? Probably some flag on saturation, brightness, contrast or any other parameter.
- I am assuming that ffmpeg uses some default settings while downscaling a video. What made ffmpeg change colors only for these two videos ? If it made similar changes for the rest of the videos as well, how to predict this behaviour before hand ?






EDIT :


What I already have Tried ?


- 

-crfwith values 0 and 18.-preset veryslowas mentioned here






None helped


Mediainfo input V/S output







 param 

input 

output 







 color range 

Limited 

NA (attribute not in description) 




 color primaries 

BT.2020 

NA (attribute not in description) 




 transfer characteristics 

HLG 

NA (attribute not in description) 




 matrix coefficients 

BT.2020 non-constant 

NA (attribute not in description) 




 bit deapth 

8 

8 









Logs of the ffmpeg command


ffmpeg -i ./input.mp4 -vf "scale=640:640:force_original_aspect_ratio=decrease,pad=ceil(iw/2)*2:ceil(ih/2)*2" -movflags +faststart ./output.mp4
ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
 built with Apple clang version 12.0.0 (clang-1200.0.32.28)
 configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.1_9 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack
 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
 libavresample 4. 0. 0 / 4. 0. 0
 libswscale 5. 7.100 / 5. 7.100
 libswresample 3. 7.100 / 3. 7.100
 libpostproc 55. 7.100 / 55. 7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from './input.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:30.05, start: 0.000000, bitrate: 10366 kb/s
 Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt2020nc/bt2020/arib-std-b67), 716x1280, 10116 kb/s, 30 fps, 30 tbr, 19200 tbn, 38400 tbc (default)
 Metadata:
 handler_name : Core Media Video
 Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 245 kb/s (default)
 Metadata:
 handler_name : Core Media Audio
Stream mapping:
 Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
 Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 0x7faab4808800] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x7faab4808800] profile High, level 3.0, 4:2:0, 8-bit
[libx264 @ 0x7faab4808800] 264 - core 161 r3027 4121277 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 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=12 lookahead_threads=2 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=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to './output.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 358x640, q=-1--1, 30 fps, 15360 tbn, 30 tbc (default)
 Metadata:
 handler_name : Core Media Video
 encoder : Lavc58.91.100 libx264
 Side data:
 cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
 Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
 Metadata:
 handler_name : Core Media Audio
 encoder : Lavc58.91.100 aac
[mp4 @ 0x7faab5808800] Starting second pass: moving the moov atom to the beginning of the file
frame= 901 fps=210 q=-1.0 Lsize= 3438kB time=00:00:30.02 bitrate= 938.0kbits/s speed=7.01x
video:2933kB audio:472kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.974633%
[libx264 @ 0x7faab4808800] frame I:6 Avg QP:22.60 size: 20769
[libx264 @ 0x7faab4808800] frame P:228 Avg QP:24.84 size: 7657
[libx264 @ 0x7faab4808800] frame B:667 Avg QP:27.59 size: 1697
[libx264 @ 0x7faab4808800] consecutive B-frames: 0.9% 0.9% 1.0% 97.2%
[libx264 @ 0x7faab4808800] mb I I16..4: 9.5% 64.6% 26.0%
[libx264 @ 0x7faab4808800] mb P I16..4: 2.5% 12.2% 2.5% P16..4: 37.2% 20.6% 11.2% 0.0% 0.0% skip:13.7%
[libx264 @ 0x7faab4808800] mb B I16..4: 0.4% 2.1% 0.2% B16..8: 42.2% 7.1% 1.2% direct: 1.8% skip:44.9% L0:39.4% L1:52.8% BI: 7.8%
[libx264 @ 0x7faab4808800] 8x8 transform intra:72.2% inter:74.2%
[libx264 @ 0x7faab4808800] coded y,uvDC,uvAC intra: 61.8% 67.2% 20.2% inter: 16.7% 13.9% 1.3%
[libx264 @ 0x7faab4808800] i16 v,h,dc,p: 24% 19% 7% 50%
[libx264 @ 0x7faab4808800] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 16% 15% 6% 9% 11% 7% 10% 6%
[libx264 @ 0x7faab4808800] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 25% 16% 13% 7% 9% 10% 7% 9% 4%
[libx264 @ 0x7faab4808800] i8c dc,h,v,p: 53% 16% 26% 5%
[libx264 @ 0x7faab4808800] Weighted P-Frames: Y:3.9% UV:1.8%
[libx264 @ 0x7faab4808800] ref P L0: 57.8% 19.5% 14.8% 7.8% 0.1%
[libx264 @ 0x7faab4808800] ref B L0: 90.7% 7.2% 2.1%
[libx264 @ 0x7faab4808800] ref B L1: 95.3% 4.7%
[libx264 @ 0x7faab4808800] kb/s:799.80
[aac @ 0x7faab2036a00] Qavg: 189.523


-
FFmpeg stream stops after a certain time
7 avril 2021, par AnarnoWe have a little Nodejs app, which starts a stream process, with a
child_process.spawn. On the client-side, we have an HTML5-canvas element, which records the video datanew MediaRecorder(canvas.captureStream(30), config), then this client sends its data to our Nodejs server over a WebSocket connection. We using FFmpeg for video encoding and decoding, then we send the data to our 3-rd party service (MUX), which accepts the stream and broadcasts them. Sadly the process continuously loses its fps, and after in general 1 minute, stops with an interesting error code. (when we save the video result locally instead of streaming viartmps, it works perfectly.

*The whole system is in docker.


The error :


stderr: [tls @ 0x7f998e7bca40] Error in the pull function.
Our_app_logs: | av_interleaved_write_frame(): I/O error 
Our_app_logs: | [flv @ 0x7f998eeb1680] Failed to update header with correct duration.
Our_app_logs: | [flv @ 0x7f998eeb1680] Failed to update header with correct filesize.
Our_app_logs: | Error writing trailer of rtmps://global-live.mux.com/app/94e85197-78a3-f092-3437-03d93aba74e0: I/O error
Our_app_logs: | <buffer 5b="5b" 74="74" 6c="6c" 73="73" 20="20" 40="40" 30="30" 78="78" 37="37" 66="66" 39="39" 38="38" 65="65" 62="62" 63="63" 61="61" 34="34" 5d="5d" 45="45" 72="72" 6f="6f" 69="69" 6e="6e" 68="68" 70="70" 75="75" 2e="2e">
Our_app_logs: | stderr: frame= 1478 fps= 25 q=23.0 Lsize= 
 402kB time=00:01:02.89 bitrate= 52.4kbits/s speed=1.05x
Our_app_logs: | video:369kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 9.034639%
Our_app_logs: | <buffer 66="66" 72="72" 61="61" 6d="6d" 65="65" 3d="3d" 20="20" 31="31" 34="34" 37="37" 38="38" 70="70" 73="73" 32="32" 35="35" 71="71" 33="33" 2e="2e" 30="30" 4c="4c" 69="69" 7a="7a" 6b="6b" 42="42" 74="74">
Our_app_logs: | stderr: [tls @ 0x7f998e7bca40] <buffer 5b="5b" 6c="6c" 73="73" 20="20" 40="40" 30="30" 78="78" 37="37" 66="66" 39="39" 38="38" 65="65" 62="62" 63="63" 61="61" 34="34" 5d="5d"> 
Our_app_logs: | stderr: The specified session has been invalidated for some reason.
Our_app_logs: | <buffer 54="54" 68="68" 65="65" 20="20" 73="73" 70="70" 63="63" 69="69" 66="66" 64="64" 6f="6f" 6e="6e" 61="61" 62="62" 76="76" 6c="6c" 74="74" 72="72" 6d="6d">
Our_app_logs: | stderr: Last message repeated 1 times 
Our_app_logs: | <buffer 20="20" 4c="4c" 61="61" 73="73" 74="74" 6d="6d" 65="65" 67="67" 72="72" 70="70" 64="64" 31="31" 69="69" 0a="0a"> 
Our_app_logs: | stderr: [libx264 @ 0x7f998e790080] <buffer 5b="5b" 6c="6c" 69="69" 62="62" 78="78" 32="32" 36="36" 34="34" 20="20" 40="40" 30="30" 37="37" 66="66" 39="39" 38="38" 65="65" 5d="5d">
Our_app_logs: | stderr: frame I:13 Avg QP: 5.39 size: 
2478
Our_app_logs: | <buffer 66="66" 72="72" 61="61" 6d="6d" 65="65" 20="20" 49="49" 3a="3a" 31="31" 33="33" 41="41" 76="76" 67="67" 51="51" 50="50" 35="35" 2e="2e" 39="39" 73="73" 69="69" 7a="7a" 32="32" 34="34" 37="37" 38="38" 0a="0a">
Our_app_logs: | stderr: [libx264 @ 0x7f998e790080] <buffer 5b="5b" 6c="6c" 69="69" 62="62" 78="78" 32="32" 36="36" 34="34" 20="20" 40="40" 30="30" 37="37" 66="66" 39="39" 38="38" 65="65" 5d="5d">
Our_app_logs: | stderr: frame P:1465 Avg QP:13.51 size: 
 235
Our_app_logs: | <buffer 66="66" 72="72" 61="61" 6d="6d" 65="65" 20="20" 50="50" 3a="3a" 31="31" 34="34" 36="36" 35="35" 41="41" 76="76" 67="67" 51="51" 33="33" 2e="2e" 73="73" 69="69" 7a="7a" 32="32" 0a="0a">
Our_app_logs: | stderr: [libx264 @ 0x7f998e790080] <buffer 5b="5b" 6c="6c" 69="69" 62="62" 78="78" 32="32" 36="36" 34="34" 20="20" 40="40" 30="30" 37="37" 66="66" 39="39" 38="38" 65="65" 5d="5d">
Our_app_logs: | stderr: mb I I16..4: 99.2% 0.1% 0.7% 
Our_app_logs: | <buffer 6d="6d" 62="62" 20="20" 49="49" 31="31" 36="36" 2e="2e" 34="34" 3a="3a" 39="39" 32="32" 25="25" 30="30" 37="37" 0a="0a"> 
Our_app_logs: | stderr: [libx264 @ 0x7f998e790080] <buffer 5b="5b" 6c="6c" 69="69" 62="62" 78="78" 32="32" 36="36" 34="34" 20="20" 40="40" 30="30" 37="37" 66="66" 39="39" 38="38" 65="65" 5d="5d">
Our_app_logs: | stderr: mb P I16..4: 0.3% 0.0% 0.0% P16..4: 0.1% 0.0% 0.0% 0.0% 0.0% skip:99.6%
Our_app_logs: | <buffer 6d="6d" 62="62" 20="20" 50="50" 49="49" 31="31" 36="36" 2e="2e" 34="34" 3a="3a" 30="30" 33="33" 25="25">
Our_app_logs: | stderr: [libx264 @ 0x7f998e790080] <buffer 5b="5b" 6c="6c" 69="69" 62="62" 78="78" 32="32" 36="36" 34="34" 20="20" 40="40" 30="30" 37="37" 66="66" 39="39" 38="38" 65="65" 5d="5d">
Our_app_logs: | stderr: 8x8 transform intra:0.3% inter:17.3%
Our_app_logs: | <buffer 38="38" 78="78" 20="20" 74="74" 72="72" 61="61" 6e="6e" 73="73" 66="66" 6f="6f" 6d="6d" 69="69" 3a="3a" 30="30" 2e="2e" 33="33" 25="25" 65="65" 31="31" 37="37" 0a="0a">
Our_app_logs: | stderr: [libx264 @ 0x7f998e790080] <buffer 5b="5b" 6c="6c" 69="69" 62="62" 78="78" 32="32" 36="36" 34="34" 20="20" 40="40" 30="30" 37="37" 66="66" 39="39" 38="38" 65="65" 5d="5d">
Our_app_logs: | stderr: coded y,uvDC,uvAC intra: 1.4% 6.9% 
4.7% inter: 0.0% 0.0% 0.0%
Our_app_logs: | <buffer 63="63" 6f="6f" 64="64" 65="65" 20="20" 79="79" 2c="2c" 75="75" 76="76" 44="44" 43="43" 41="41" 69="69" 6e="6e" 74="74" 72="72" 61="61" 3a="3a" 31="31" 2e="2e" 34="34" 25="25" 36="36" 39="39" 37="37" 30="30">
Our_app_logs: | stderr: [libx264 @ 0x7f998e790080] <buffer 5b="5b" 6c="6c" 69="69" 62="62" 78="78" 32="32" 36="36" 34="34" 20="20" 40="40" 30="30" 37="37" 66="66" 39="39" 38="38" 65="65" 5d="5d">
Our_app_logs: | stderr: i16 v,h,dc,p: 90% 5% 5% 0%
Our_app_logs: | <buffer 69="69" 31="31" 36="36" 20="20" 76="76" 2c="2c" 68="68" 64="64" 63="63" 70="70" 3a="3a" 39="39" 30="30" 25="25" 35="35" 0a="0a">
Our_app_logs: | stderr: [libx264 @ 0x7f998e790080] <buffer 5b="5b" 6c="6c" 69="69" 62="62" 78="78" 32="32" 36="36" 34="34" 20="20" 40="40" 30="30" 37="37" 66="66" 39="39" 38="38" 65="65" 5d="5d">
Our_app_logs: | stderr: i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 
18% 51% 6% 0% 0% 0% 0% 3%
Our_app_logs: | <buffer 69="69" 38="38" 20="20" 76="76" 2c="2c" 68="68" 64="64" 63="63" 6c="6c" 72="72" 75="75" 3a="3a" 32="32" 33="33" 25="25" 31="31" 35="35" 36="36" 30="30">
Our_app_logs: | stderr: [libx264 @ 0x7f998e790080] <buffer 5b="5b" 6c="6c" 69="69" 62="62" 78="78" 32="32" 36="36" 34="34" 20="20" 40="40" 30="30" 37="37" 66="66" 39="39" 38="38" 65="65" 5d="5d">
Our_app_logs: | stderr: i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 33% 
25% 40% 0% 0% 0% 0% 0% 0%
Our_app_logs: | <buffer 69="69" 34="34" 20="20" 76="76" 2c="2c" 68="68" 64="64" 63="63" 6c="6c" 72="72" 75="75" 3a="3a" 33="33" 25="25" 32="32" 35="35" 30="30">
Our_app_logs: | stderr: [libx264 @ 0x7f998e790080] <buffer 5b="5b" 6c="6c" 69="69" 62="62" 78="78" 32="32" 36="36" 34="34" 20="20" 40="40" 30="30" 37="37" 66="66" 39="39" 38="38" 65="65" 5d="5d">
Our_app_logs: | stderr: i8c dc,h,v,p: 86% 7% 6% 0%
Our_app_logs: | <buffer 69="69" 38="38" 63="63" 20="20" 64="64" 2c="2c" 68="68" 76="76" 70="70" 3a="3a" 36="36" 25="25" 37="37" 30="30" 0a="0a">
Our_app_logs: | stderr: [libx264 @ 0x7f998e790080] <buffer 5b="5b" 6c="6c" 69="69" 62="62" 78="78" 32="32" 36="36" 34="34" 20="20" 40="40" 30="30" 37="37" 66="66" 39="39" 38="38" 65="65" 5d="5d">
Our_app_logs: | stderr: Weighted P-Frames: Y:0.1% UV:0.1% 
Our_app_logs: | <buffer 57="57" 65="65" 69="69" 67="67" 68="68" 74="74" 64="64" 20="20" 50="50" 2d="2d" 46="46" 72="72" 61="61" 6d="6d" 73="73" 3a="3a" 59="59" 30="30" 2e="2e" 31="31" 25="25" 55="55" 56="56" 0a="0a"> 
Our_app_logs: | stderr: [libx264 @ 0x7f998e790080] <buffer 5b="5b" 6c="6c" 69="69" 62="62" 78="78" 32="32" 36="36" 34="34" 20="20" 40="40" 30="30" 37="37" 66="66" 39="39" 38="38" 65="65" 5d="5d">
Our_app_logs: | stderr: kb/s:2041.23
Our_app_logs: | <buffer 6b="6b" 62="62" 2f="2f" 73="73" 3a="3a" 32="32" 30="30" 34="34" 31="31" 2e="2e" 33="33" 0a="0a">
Our_app_logs: | stderr: Conversion failed!
Our_app_logs: | <buffer 43="43" 6f="6f" 6e="6e" 76="76" 65="65" 72="72" 73="73" 69="69" 20="20" 66="66" 61="61" 6c="6c" 64="64" 21="21" 0a="0a">
Our_app_logs: | close, code: 1, signal: null
Our_app_logs: | from react application: 14203
Our_app_logs: | Status ok...
Our_app_logs: | Data ok...
Our_app_logs: | FFmpeg ok...
Our_app_logs: | Writeable ok... <buffer c4="c4" 81="81" 0e="0e" 11="11" 00="00" 01="01" 61="61" c7="c7" 80="80" 5b="5b" b6="b6" 72="72" 03="03" bc="bc" b7="b7" de="de" 59="59" 7f="7f" 3c="3c" 27="27" b3="b3" 87="87" b2="b2" e6="e6" 84="84" d0="d0" f0="f0" 02="02" 2d="2d" c0="c0" 08="08" 70="70"> undefined
Our_app_logs: | stderr: ffmpeg version 4.2.4 Copyright (c) 
2000-2020 the FFmpeg developers
Our_app_logs: | built with gcc 9.2.0 (Alpine 9.2.0)
Our_app_logs: | configuration: --prefix=/usr --enable-avresample --enable-avfilter --enable-gnutls --enable-gpl --enable-libass --enable-libmp3lame --enable-libvorbis --enable-libvpx --enable-libxvid --enable-libx264 --enable-libx265 --enable-libtheora --enable-libv4l2 --enable-postproc --enable-pic --enable-pthreads --enable-shared --enable-libxcb --disable-stripping --disable-static --disable-librtmp --enable-vaapi --enable-vdpau --enable-libopus --disable-debug
Our_app_logs: | <buffer 66="66" 6d="6d" 70="70" 65="65" 67="67" 20="20" 76="76" 72="72" 73="73" 69="69" 6f="6f" 6e="6e" 34="34" 2e="2e" 32="32" 43="43" 79="79" 68="68" 74="74" 28="28" 63="63" 29="29" 30="30" 2d="2d" 46="46">
Our_app_logs: | stderr: libavutil 56. 31.100 / 56. 31.100
Our_app_logs: | libavcodec 58. 54.100 / 58. 54.100 
Our_app_logs: | libavformat 58. 29.100 / 58. 29.100
Our_app_logs: | libavdevice 58. 8.100 / 58. 8.100
Our_app_logs: | libavfilter 7. 57.100 / 7. 57.100
Our_app_logs: | libavresample 4. 0. 0 / 4. 0. 0 
Our_app_logs: | libswscale 5. 5.100 / 5. 5.100 
Our_app_logs: | libswresample 3. 5.100 / 3. 5.100 
Our_app_logs: | libpostproc 55. 5.100 / 55. 5.100 
Our_app_logs: | <buffer 20="20" 6c="6c" 69="69" 62="62" 61="61" 76="76" 75="75" 74="74" 35="35" 36="36" 2e="2e" 33="33" 31="31" 30="30" 2f="2f" 0a="0a" 63="63" 6f="6f">
Our_app_logs: | stderr: [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced
Our_app_logs: | Last message repeated 4 times
Our_app_logs: | [h264 @ 0x7f299f44f600] decode_slice_header error
Our_app_logs: | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced
Our_app_logs: | [h264 @ 0x7f299f44f600] decode_slice_header error
Our_app_logs: | [h264 @ 0x7f299f44f600] no frame!
Our_app_logs: | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced
Our_app_logs: | [h264 @ 0x7f299f44f600] decode_slice_header error
Our_app_logs: | <buffer 5b="5b" 68="68" 32="32" 36="36" 34="34" 20="20" 40="40" 30="30" 78="78" 37="37" 66="66" 39="39" 5d="5d" 6e="6e" 6f="6f" 2d="2d" 65="65" 69="69" 73="73" 74="74" 67="67" 50="50" 53="53" 31="31" 72="72">
Our_app_logs: | stderr: [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced
Our_app_logs: | [h264 @ 0x7f299f44f600] decode_slice_header error
Our_app_logs: | [h264 @ 0x7f299f44f600] no frame!
Our_app_logs: | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced
Our_app_logs: | [h264 @ 0x7f299f44f600] decode_slice_header error
Our_app_logs: | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced
Our_app_logs: | [h264 @ 0x7f299f44f600] decode_slice_header error
Our_app_logs: | [h264 @ 0x7f299f44f600] no frame!
Our_app_logs: | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced
Our_app_logs: | [h264 @ 0x7f299f44f600] decode_slice_header error
Our_app_logs: | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced
Our_app_logs: | [h264 @ 0x7f299f44f600] decode_slice_header error
Our_app_logs: | [h264 @ 0x7f299f44f600] no frame!
Our_app_logs: | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced
Our_app_logs: | Last message repeated 5 times
Our_app_logs: | [h264 @ 0x7f299f44f600] decode_slice_header error
Our_app_logs: | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced
Our_app_logs: | [h264 @ 0x7f299f44f600] decode_slice_header error
Our_app_logs: | [h264 @ 0x7f299f44f600] no frame!
Our_app_logs: | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced
Our_app_logs: | [h264 @ 0x7f299f44f600] decode_slice_header error
Our_app_logs: | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced
Our_app_logs: | [h264 @ 0x7f299f44f600] decode_slice_header error
Our_app_logs: | [h264 @ 0x7f299f44f600] no frame!
Our_app_logs: | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced
Our_app_logs: | [h264 @ 0x7f299f44f600] decode_slice_headerOur_app_logs: | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced
Our_app_logs: | [h264 @ 0x7f299f44f600] decode_slice_header error
Our_app_logs: | [h264 @ 0x7f299f44f600] no frame!
Our_app_logs: | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced
Our_app_logs: | [h264 @ 0x7f299f44f600] decode_slice_header error
Our_app_logs: | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced
Our_app_logs: | [h264 @ 0x7f299f44f600] decode_slice_header error
Our_app_logs: | [h264 @ 0x7f299f44f600] no frame!
Our_app_logs: | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced
Our_app_logs: | [h264 @ 0x7f299f44f600] decode_slice_header error
Our_app_logs: | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced
Our_app_logs: | [h264 @ 0x7f299f44f600] decode_slice_header error
Our_app_logs: | [h264 @ 0x7f299f44f600] no frame!

</buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer>

The FFmpeg config :


const FFMPEG_CONFIG = [
 '-i',
 '-',

 // video codec config: low latency, adaptive bitrate
 // '-vcodec',
 // 'copy',
 '-c:v',
 'libx264',
 '-preset',
 'veryfast',
 '-tune',
 'zerolatency',

 // audio codec config: sampling frequency (11025, 22050, 44100), bitrate 64 kbits
 '-c:a',
 'aac',
 '-ar',
 '44100',
 '-b:a',
 '64k',

 //force to overwrite
 '-y',

 // used for audio sync
 '-use_wallclock_as_timestamps',
 '1',
 '-async',
 '1',

 //'-filter_complex', 'aresample=44100', // resample audio to 44100Hz, needed if input is not 44100
 //'-strict', 'experimental',
 '-bufsize',
 '1000',
 '-f',
 'flv',
];


The process :


const process = child_process.spawn('ffmpeg', [
 ...FFMPEG_CONFIG,
 // 'local.bin',
 url,
 ]);
 
 process.stderr.on('data', data => {
 console.log(`stderr: ${data}`, data);
 });

 process.stdin.on('error', e => {
 console.log('FFmpeg STDIN Error', e);
 });

 process.on('error', err => console.log(err));

 process.on('close', (code, signal) => {
 console.log(`close, code: ${code}, signal: ${signal}`);
 });


The writing :


if (!Buffer.isBuffer(data)) return;
if (!process.stdin.writable) return;
process.stdin.write(data);


-
.mp4 file is not playing in Django template and FireFox or Chrome
9 février 2021, par Himanshu sharmaI can save live RTSP video stream in .mp4 but when I run saved .mp4 video in Django template or Firefox or Chrome browser or VLC, video is not playing in ubuntu.
I think I have a compatible issue problem in .mp4. Furthermore, I want to show and play .mp4 saved file in Django.


I have a two IP camera which provides a live RTSP video stream.


self.input_stream---> rtsp://admin:Admin123@192.168.1.208/user=admin_password=Admin123_channel=0channel_number_stream=0.sdp

self.input_stream---> rtsp://Admin:@192.168.1.209/user=Admin_password=_channel=0channel_number_stream=0.sdp


Python 3.8.5 (default, Jul 28 2020, 12:59:40)
[GCC 9.3.0] on linux,


Django==3.1.2


I am implementing this code in difference Ubuntu PCs


Ubuntu = 18.04 and 20.04


opencv-contrib-python==4.4.0.46


opencv-python==4.4.0.46


ffmpeg version 4.2.4-1ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)


I had tried different fourcc to save .mp4 but below fourcc work perfectly in Ubuntu.


fourcc = cv2.VideoWriter_fourcc(*'mp4v')


class ffmpegStratStreaming(threading.Thread):
 def __init__(self, input_stream=None, output_stream=None, camera=None, *args, **kwargs):
 self.input_stream = input_stream
 self.output_stream = output_stream
 self.camera = camera
 super().__init__(*args, **kwargs)

 def run(self):
 try:vs = cv2.VideoCapture(self.input_stream)
 fps_rate = int(vs.get(cv2.CAP_PROP_FPS))
 ##############################
 ############################## 
 # ~ print('fps rate-->', fps_rate,'camera id-->' ,str(self.camera.id))
 # ~ vs.set(cv2.CAP_PROP_POS_FRAMES,50) #Set the frame number to be obtained
 # ~ print('fps rate-->', fps_rate,'camera id-->' ,str(self.camera.id),' ####### ')
 
 # initialize the video writer (we'll instantiate later if need be)
 writer = None

 # initialize the frame dimensions (we'll set them as soon as we read
 # the first frame from the video)
 W = None
 H = None 
 # start the frames per second throughput estimator
 fps = FPS().start()

 # saving frame in avi video format
 video_file_count = 0
 start_time = time.time()

 while True:
 try:
 # grab the next frame and handle if we are reading from either
 # VideoCapture or VideoStream
 
 frame_init = vs.read()
 frame = frame_init[1] if self.input_stream else frame_init
 
 # if frame is can't read correctly ret is False
 while frame_init[0] == False:
 print("Can't receive frame. Retrying ...")
 vs.release()
 vs = cv2.VideoCapture(self.input_stream) 
 frame_init = vs.read()
 frame = frame_init[1] if self.input_stream else frame_init

 # if we are viewing a video and we did not grab a frame then we
 # have reached the end of the video
 if self.input_stream is not None and frame is None:
 break

 # resize the frame to have a maximum width of 500 pixels (the
 # less data we have, the faster we can process it), then convert
 # the frame from BGR to RGB for dlib
 frame = imutils.resize(frame, width=500) 
 
 
 #<---------------------- Start of writing a video to disk -------------------------> 
 minute = 1
 second = 60
 minite_to_save_video = int(minute) * int(second)

 
 # if we are supposed to be writing a video to disk, initialize
 if time.time() - start_time >= minite_to_save_video or video_file_count == 0 :
 ## where H = heigth, W = width, C = channel 
 H, W, C = frame.shape
 video_file_count += 1
 start_time = time.time()
 output_save_directory = self.output_stream+str(video_file_count)+'.mp4'
 # fourcc = cv2.VideoWriter_fourcc(*"MJPG")
 # fourcc = cv2.VideoWriter_fourcc(*'XVID')
 # fourcc = cv2.VideoWriter_fourcc(*'X264')
 # fourcc = cv2.VideoWriter_fourcc(*'MP4V')

 
 # fourcc = cv2.VideoWriter_fourcc(*'FMP4')

 # fourcc = cv2.VideoWriter_fourcc(*'avc1')


 # fourcc = cv2.VideoWriter_fourcc('M','J','P','G')

 fourcc = cv2.VideoWriter_fourcc(*'mp4v')
 # fourcc = cv2.VideoWriter_fourcc(*'mp3v')
 # fourcc = 0x00000021
 print(fourcc, type(fourcc),'ffffffff')
 # a = int(vs.get(cv2.CAP_PROP_FOURCC))
 # print(a,type(a),' aaaaaaaa' )

 # writer = skvideo.io.FFmpegWriter(output_save_directory, outputdict={
 # '-vcodec': 'libx264', '-b': '300000000'
 # })
 
 # writer = skvideo.io.FFmpegWriter(self.output_stream, outputdict={'-r': '120', '-c:v': 'libx264', '-crf': '0', '-preset': 'ultrafast', '-pix_fmt': 'yuv444p'})
 
 writer = cv2.VideoWriter(output_save_directory, fourcc ,20.0,( int(W), int(H) ), True)
 
 
 # ~ The cv2.VideoWriter requires five parameters: 

 # check to see if we should write the frame to disk
 if writer is not None: 
 try:
 writer.write(frame)
 except Exception as e:
 print('Error in writing video output---> ', e)
 
 #<---------------------- end of writing a video to disk ------------------------->

 # show the output frame
 # cv2.imshow("Frame", frame)
 # key = cv2.waitKey(1) & 0xFF

 # if the `q` key was pressed, break from the loop
 # if key == ord("q"):
 # break

 # increment the total number of frames processed thus far and
 # then update the FPS counter
 totalFrames += 1
 fps.update()
 except Exception as e:
 print('Error in main while loop--> ', e)

 # stop the timer and display FPS information
 fps.stop()

 # check to see if we need to release the video writer pointer
 # if writer is not None:
 # writer.release()

 # if we are not using a video file, stop the camera video stream
 # if not self.input_stream:
 # vs.stop()

 # otherwise, release the video file pointer
 # else:
 # vs.release()

 # close any open windows
 # cv2.destroyAllWindows()
 except Exception as e:
 print(e, '333333333333333333333333333')


My Django template code


{% block main %}
<div class="row">
 {% if folders|length == 0 %}
 <div class="col-md-12 text-center">
 <h6 class="card-title">There are no files in this directory.</h6>
 </div>
 {% else %}
 {% for folder in folders %}
 <div class="col-md-3 text-center">
 <div class="card-block">
 <video class="video-js vjs-fluid vjs-default-skin" controls="controls" preload="auto" muted="muted" data-setup="'{" true="true"></video>
 <source src="{% get_media_prefix %}camera-feed/video-saved/{{pk}}/{{parent}}/{{folder}}" type="video/mp4">
 
 <h6 class="card-title">{{folder}}</h6>
 </source></div>
 </div>
 {% endfor %}
 {% endif %}
</div>
{% endblock %}


Function in view.py to see saved .mp4 video in Django template. Video is saved at local folder.


def CameraVideos(request, pk, folder):
 dirpath = settings.MEDIA_ROOT + '/camera-feed/video-saved/' + str(pk) + '/' + folder
 folders = sorted(Path(dirpath).iterdir(), key=os.path.getmtime)
 data = []
 for file in folders:
 if not file.name.startswith('.'):
 data.append(file.name)
 return render(request, "home/camera_video.html", {'folders': data, 'pk': pk, 'parent': folder})


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