this is about saving harddisk space, by reeconding videos (basically zipping videos to take up less space) takes a lot of CPU power… GPUs are way efficienter at this. no one would have guessed that a 14 year old (!!!) macbook pro with HD 4000 can reencode at 3x or 5x the playback speed! while using only 20% CPU 😀 😀 absolutely amazing work all involved!
lack of hardware acceleration makes 8k videos stutter as heck because even the fastest CPU will reach it’s limit with 8k playback (can test it with youtube but also with dwave’s S21 8k videos)
before trying this obviously make sure the OS is up to date
warning! while this script is pretty cool, it sometimes produces files LARGER than the original file.
so in order to make this usefull, it might be wise, to include a check: is the new reencoded file smaller than the original file? good delete the original, otherwise keep the original and delete the reencoded X-D
hostnamectl; # tested on Static hostname: macian Icon name: computer-laptop Chassis: laptop 💻 Operating System: Debian GNU/Linux 13 (trixie) Kernel: Linux 6.12.105+deb13-amd64 Architecture: x86-64 Hardware Vendor: Apple Inc. Hardware Model: MacBookPro9,2 Firmware Version: 429.0.0.0.0 # as non root user that also runs the desktop run glxinfo -B name of display: :0 display: :0 screen: 0 direct rendering: Yes Extended renderer info (GLX_MESA_query_renderer): Vendor: Intel (0x8086) Device: Mesa Intel(R) HD Graphics 4000 (IVB GT2) (0x166) Version: 25.0.7 Accelerated: yes Video memory: 1536MB Unified memory: yes Preferred profile: core (0x1) Max core profile version: 4.2 Max compat profile version: 4.2 Max GLES1 profile version: 1.1 Max GLES[23] profile version: 3.0 OpenGL vendor string: Intel OpenGL renderer string: Mesa Intel(R) HD Graphics 4000 (IVB GT2) OpenGL core profile version string: 4.2 (Core Profile) Mesa 25.0.7-2+deb13u1 OpenGL core profile shading language version string: 4.20 OpenGL core profile context flags: (none) OpenGL core profile profile mask: core profile OpenGL version string: 4.2 (Compatibility Profile) Mesa 25.0.7-2+deb13u1 OpenGL shading language version string: 4.20 OpenGL context flags: (none) OpenGL profile mask: compatibility profile OpenGL ES profile version string: OpenGL ES 3.0 Mesa 25.0.7-2+deb13u1 OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.00 apt install mesa-utils apt install vainfo i965-va-driver ffmpeg -hide_banner -encoders | grep -E 'h264|hevc' V....D libx264 libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (codec h264) V....D libx264rgb libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 RGB (codec h264) V....D h264_nvenc NVIDIA NVENC H.264 encoder (codec h264) V..... h264_qsv H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (Intel Quick Sync Video acceleration) (codec h264) V..... h264_v4l2m2m V4L2 mem2mem H.264 encoder wrapper (codec h264) V....D h264_vaapi H.264/AVC (VAAPI) (codec h264) V....D h264_vulkan H.264/AVC (Vulkan) (codec h264) V....D libx265 libx265 H.265 / HEVC (codec hevc) V....D hevc_nvenc NVIDIA NVENC hevc encoder (codec hevc) V..... hevc_qsv HEVC (Intel Quick Sync Video acceleration) (codec hevc) V..... hevc_v4l2m2m V4L2 mem2mem HEVC encoder wrapper (codec hevc) V....D hevc_vaapi H.265/HEVC (VAAPI) (codec hevc) V....D hevc_vulkan H.265/HEVC (Vulkan) (codec hevc) # Do not rely on the presence of hevc_vaapi or hevc_qsv: FFmpeg lists compiled encoders even when the GPU cannot support them. HD 4000 should support hardware H.264 encoding, but not hardware H.265/HEVC encoding vainfo; # as non root user Trying display: wayland Trying display: x11 libva info: VA-API version 1.22.0 libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/iHD_drv_video.so libva info: Found init function __vaDriverInit_1_22 libva error: /usr/lib/x86_64-linux-gnu/dri/iHD_drv_video.so init failed libva info: va_openDriver() returns 1 libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so libva info: Found init function __vaDriverInit_1_22 libva info: va_openDriver() returns 0 vainfo: VA-API version: 1.22 (libva 2.22.0) vainfo: Driver version: Intel i965 driver for Intel(R) Ivybridge Mobile - 2.4.1 vainfo: Supported profile and entrypoints VAProfileMPEG2Simple : VAEntrypointVLD VAProfileMPEG2Simple : VAEntrypointEncSlice VAProfileMPEG2Main : VAEntrypointVLD VAProfileMPEG2Main : VAEntrypointEncSlice VAProfileH264ConstrainedBaseline: VAEntrypointVLD VAProfileH264ConstrainedBaseline: VAEntrypointEncSlice VAProfileH264Main : VAEntrypointVLD VAProfileH264Main : VAEntrypointEncSlice VAProfileH264High : VAEntrypointVLD VAProfileH264High : VAEntrypointEncSlice VAProfileH264StereoHigh : VAEntrypointVLD VAProfileVC1Simple : VAEntrypointVLD VAProfileVC1Main : VAEntrypointVLD VAProfileVC1Advanced : VAEntrypointVLD VAProfileNone : VAEntrypointVideoProc VAProfileJPEGBaseline : VAEntrypointVLD # the script WARNING! will also reduce resolution by 50% to save disk space (degrading quality) vim /scripts/reencode_half_size_x264_mp3_64Bit_hard_hd4000_v2.sh #!/usr/bin/env bash # # vaapi_recompress.sh # # Iterates over movie files in the current directory, and for any filename # containing "recompress" (case-sensitive), asks whether to reencode it via # VAAPI hardware H.264 encoding at half resolution with 64kbit MP3 audio. # Files not containing "recompress" are skipped automatically. # # If the reencoded file ends up larger than the original, the reencode is # discarded and the original is kept. set -uo pipefail VAAPI_DEVICE="/dev/dri/renderD128" # --- Sanity checks ----------------------------------------------------- if ! command -v ffmpeg >/dev/null 2>&1; then echo "Error: ffmpeg not found in PATH." >&2 exit 1 fi if [[ ! -e "$VAAPI_DEVICE" ]]; then echo "Error: VAAPI device $VAAPI_DEVICE not found." >&2 exit 1 fi # --- Glob setup ---------------------------------------------------------- # nullglob: unmatched patterns expand to nothing instead of themselves # nocaseglob: match extensions regardless of case shopt -s nullglob nocaseglob extensions=(mp4 webm avi mkv mpg mpeg wmv mov) files=() for ext in "${extensions[@]}"; do for f in *."$ext"; do [[ -f "$f" ]] && files+=("$f") done done if [[ ${#files[@]} -eq 0 ]]; then echo "No movie files found in current directory." exit 0 fi # --- Main loop ------------------------------------------------------------- for f in "${files[@]}"; do if [[ "$f" == *recompress* ]]; then read -rp "Filename '$f' contains 'recompress'. Process it? [y/n] " ans case "$ans" in [Yy]|[Yy][Ee][Ss]) ;; [Nn]|[Nn][Oo]) echo "Skipped by user: $f" continue ;; *) echo "Unrecognized answer, treating as 'no'. Skipped: $f" continue ;; esac else echo "Processing (no 'recompress' in filename, auto-processing): $f" fi base="${f%.*}" tmpout="${base}.__reencode_tmp__.mp4" # Clean up any leftover temp file from a previous aborted run rm -f "$tmpout" echo "Reencoding: $f -> $tmpout" ffmpeg -y \ -vaapi_device "$VAAPI_DEVICE" \ -i "$f" \ -vf "format=nv12,hwupload,scale_vaapi=w=trunc(iw/4)*2:h=trunc(ih/4)*2" \ -c:v h264_vaapi \ -c:a libmp3lame -b:a 64k \ "$tmpout" rc=$? if [[ $rc -ne 0 || ! -s "$tmpout" ]]; then echo "ffmpeg failed (or produced empty output) for: $f -- keeping original, removing temp file." rm -f "$tmpout" continue fi orig_size=$(stat -c%s -- "$f") new_size=$(stat -c%s -- "$tmpout") echo "Original size: $orig_size bytes | New size: $new_size bytes" if (( new_size >= orig_size )); then echo "Reencoded file is not smaller. Keeping original, discarding reencode: $f" rm -f "$tmpout" else finalout="${base}_x264_64Bit_mp3_recompressed.mp4" # If the original wasn't itself .mp4, we're changing container/extension. # Remove the original first, then move the temp file into place. rm -f -- "$f" # Avoid clobbering if finalout somehow already exists (e.g. same base name, # different original extension already processed this run). if [[ -e "$finalout" && "$finalout" != "$f" ]]; then echo "Warning: target '$finalout' already exists, keeping temp name '$tmpout'." else mv -- "$tmpout" "$finalout" echo "Replaced original with reencoded file: $finalout" fi fi done echo "Done."
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