(click here for two html embedded test video files, if the user’s browser can playback 264x and 265x)
lsb_release -a; # tested with
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 10 (buster)
Release: 10
Codename: buster
recompressing mobile phone videos can save significant amount of (precious ssd) disk space.
it is very cpu intense – so either bring massive amounts of cpu power or massive amounts of runtime 🙂
on 4x threads Core(TM) i5-4200U CPU the average framerate is below 2 frames per second for x265.
watch one’s cpu temp: it’s gettin’ hot
make sure CPU is properly cooled and can handle the stress without overheating (usually CPU will throttle the clock/power consumption)
apt install lscpu; # install lscpu while true; do lscpu; sleep 1; clear; done; # observe cpu clock speed
sd, hd, 4k, 8k, a bit confusing video standards & resolutions:
resolutions SD (480p) vs Full HD (1080p) vs 4K Ultra HD vs 8K Ultra HD (click to view original size)
original material:
the nexus 6p does per default HD video encoded with x264: (which is pretty good, but x265 will save ~10x the space! (compress 10x better))
let’s get started:
hostnamectl; # tested on Operating System: Debian GNU/Linux 10 (buster) Kernel: Linux 4.19.0-8-amd64 Architecture: x86-64 su - root; # become root apt update; # update package definitions apt install ffmpeg; # install ffmpeg # re-compress / re-encode mp4 video with x264 codec time ffmpeg -i VID_20200321_113505.mp4 -vcodec libx264 -crf 20 VID_20200321_113505.x264.recompressed.mp4 # re-compress / re-encode mp4 video with new x265 codec # slower but almost +50% better compression! # not all devices (TVs with usb ports) might support x265 codec yet time ffmpeg -i VID_20200321_113505.mp4 -vcodec libx265 -crf 20 VID_20200321_113505.x265.recompressed.mp4 # reduce also the resolution by half FILENAME=20220122_220653.mp4; ffmpeg -i $FILENAME -vf "scale=trunc(iw/4)*2:trunc(ih/4)*2" -c:v libx264 -crf 28 $FILENAME.half-size.x264.mp4 FILENAME=20220122_220653.mp4; ffmpeg -i $FILENAME -vf "scale=trunc(iw/4)*2:trunc(ih/4)*2" -c:v libx265 -crf 28 $FILENAME.half-size.x265.mp4 # scripting it vim /scripts/reencode_x265.sh #!/bin/bash echo "=== re encoding video file via ffmpeg and x265 ===" FILENAME=$1; time ffmpeg -i $FILENAME -vcodec libx265 -crf 20 $FILENAME.x265.recompressed.mp4 vim /scripts/reencode_x265_half_size.sh #!/bin/bash echo "=== re encoding video file via ffmpeg and x265 plus reducing resolution by HALF! ===" FILENAME=$1; time ffmpeg -i $FILENAME -vf "scale=trunc(iw/4)*2:trunc(ih/4)*2" -c:v libx265 -crf 28 $FILENAME.half-size.x265.mp4 lscpu; # show cpu information Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian Address sizes: 39 bits physical, 48 bits virtual CPU(s): 4 On-line CPU(s) list: 0-3 Thread(s) per core: 2 Core(s) per socket: 2 Socket(s): 1 NUMA node(s): 1 Vendor ID: GenuineIntel CPU family: 6 Model: 69 Model name: Intel(R) Core(TM) i5-4200U CPU @ 1.60GHz ffmpeg -version;# show version informations ffmpeg version 4.1.4-1~deb10u1 Copyright (c) 2000-2019 the FFmpeg developers built with gcc 8 (Debian 8.3.0-6) configuration: --prefix=/usr --extra-version='1~deb10u1' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared libavutil 56. 22.100 / 56. 22.100 libavcodec 58. 35.100 / 58. 35.100 libavformat 58. 20.100 / 58. 20.100 libavdevice 58. 5.100 / 58. 5.100 libavfilter 7. 40.101 / 7. 40.101 libavresample 4. 0. 0 / 4. 0. 0 libswscale 5. 3.100 / 5. 3.100 libswresample 3. 3.100 / 3. 3.100 libpostproc 55. 3.100 / 55. 3.100 # output during process ffmpeg version 4.1.4-1~deb10u1 Copyright (c) 2000-2019 the FFmpeg developers built with gcc 8 (Debian 8.3.0-6) configuration: --prefix=/usr --extra-version='1~deb10u1' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared libavutil 56. 22.100 / 56. 22.100 libavcodec 58. 35.100 / 58. 35.100 libavformat 58. 20.100 / 58. 20.100 libavdevice 58. 5.100 / 58. 5.100 libavfilter 7. 40.101 / 7. 40.101 libavresample 4. 0. 0 / 4. 0. 0 libswscale 5. 3.100 / 5. 3.100 libswresample 3. 3.100 / 3. 3.100 libpostproc 55. 3.100 / 55. 3.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'VID_20200327_213853.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf58.20.100 Duration: 00:04:28.07, start: 0.000000, bitrate: 11704 kb/s Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc), 1920x1080 [SAR 1:1 DAR 16:9], 11626 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default) Metadata: handler_name : VideoHandle Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 69 kb/s (default) Metadata: handler_name : SoundHandle Stream mapping: Stream #0:0 -> #0:0 (h264 (native) -> hevc (libx265)) Stream #0:1 -> #0:1 (aac (native) -> aac (native)) Press [q] to stop, [?] for help [swscaler @ 0x55f1d4365b40] deprecated pixel format used, make sure you did set range correctly x265 [info]: HEVC encoder version 2.9 x265 [info]: build info [Linux][GCC 8.2.0][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-4 (Main tier) x265 [info]: Thread pool created using 4 threads x265 [info]: Slices : 1 x265 [info]: frame threads / pool features : 2 / wpp(17 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 / 2 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 / on / on x265 [info]: AQ: mode / str / qg-size / cu-tree : 1 / 1.0 / 32 / 1 x265 [info]: Rate Control / qCompress : CRF-20.0 / 0.60 x265 [info]: tools: rd=3 psy-rd=2.00 rskip signhide tmvp strong-intra-smoothing x265 [info]: tools: lslices=6 deblock sao Output #0, mp4, to 'VID_20200327_213853.mp4.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf58.20.100 Stream #0:0(eng): Video: hevc (libx265) (hev1 / 0x31766568), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 30 fps, 15360 tbn, 30 tbc (default) Metadata: handler_name : VideoHandle encoder : Lavc58.35.100 libx265 Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 69 kb/s (default) Metadata: handler_name : SoundHandle encoder : Lavc58.35.100 aac frame= 70 fps=3.1 q=-0.0 size= 768kB time=00:00:02.43 bitrate=2587.1kbits/s speed=0.108x
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