On 09/04/2020 14:43, atticus via ffmpeg-user wrote: > ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ > On Thursday, April 9, 2020 9:42 AM, Michael Koch > <[email protected]> wrote: > >>> Am 09.04.2020 um 11:36 schrieb atticus via ffmpeg-user: >>> > >>>> Hi there, >>>> I'm scaling a video by with this filter: >>>> -vf "scale=720:320:force_original_aspect_ratio=decrease" >>>> which works perfectly fine, since I can input the my desired resolution and >>>> ffmpeg decides on its own which dimension should be scaled by how much to >>>> keep the aspect ratio. The problem now is that in some cases ffmpeg will >>>> calculate a uneven number for one of the dimensions (with the h264 codec) >>>> thus I get this error: >>>> [libx264 @ 0x5633df10bcc0] width not divisible by 2 (569x320) >>>> Error initializing output stream 0:0 -- Error while opening encoder for >>>> output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, >>>> width or height >>>> Is there some way to prevent this to give ffmpeg a width and a height as an >>>> input and it says on its own which should be scaled by how much AND keep >>>> (at >>>> least the calculated) dimensions divisable by n (I know something similar >>>> is >>>> possible with negative numbers, but then I can only give one dimension)? >>> > >>> The scale filter has an option 'force_divisible_by' >>> > >>> Michael > >> Thanks for your fast reply. >> >> Oh sorry to have bothered you all, I must have overlooked this option when >> studying the ffmpeg site for scaling. >> > >> With Best Wishshes > > Well I still have a problem when using this: > > ffmpeg -y -i video.MTS -vf > "scale=720:320:force_original_aspect_ratio=decrease:force_divisible_by=2" > -c:a copy -c:v h264 padded.MTS > ffmpeg version n4.2.2 Copyright (c) 2000-2019 the FFmpeg developers > built with gcc 9.3.0 (Arch Linux 9.3.0-1) > configuration: --prefix=/usr --disable-debug --disable-static > --disable-stripping --enable-fontconfig --enable-gmp --enable-gnutls > --enable-gpl --enable-ladspa --enable-libaom --enable-libass > --enable-libbluray --enable-libdav1d --enable-libdrm --enable-libfreetype > --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack > --enable-libmfx --enable-libmodplug --enable-libmp3lame > --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg > --enable-libopus --enable-libpulse --enable-libsoxr --enable-libspeex > --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab > --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 > --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid > --enable-nvdec --enable-nvenc --enable-omx --enable-shared --enable-version3 > libavutil 56. 31.100 / 56. 31.100 > libavcodec 58. 54.100 / 58. 54.100 > libavformat 58. 29.100 / 58. 29.100 > libavdevice 58. 8.100 / 58. 8.100 > libavfilter 7. 57.100 / 7. 57.100 > libswscale 5. 5.100 / 5. 5.100 > libswresample 3. 5.100 / 3. 5.100 > libpostproc 55. 5.100 / 55. 5.100 > Input #0, mpegts, from 'video.MTS': > Duration: 00:00:08.32, start: 1.040000, bitrate: 22401 kb/s > Program 1 > Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448), yuv420p(top > first), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 50 tbr, 90k tbn, 50 tbc > Stream #0:1[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, > fltp, 256 kb/s > Stream #0:2[0x1200]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / > 0x0090), 1920x1080 > Stream mapping: > Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264)) > Stream #0:1 -> #0:1 (copy) > Press [q] to stop, [?] for help > [Parsed_scale_0 @ 0x562f226b0980] Option 'force_divisible_by' not found > [AVFilterGraph @ 0x562f226ae400] Error initializing filter 'scale' with args > '720:320:force_original_aspect_ratio=decrease:force_divisible_by=2:flags=bicubic' > Error reinitializing filters! > Failed to inject frame into filter network: Option not found > Error while processing the decoded data for stream #0:0 > Conversion failed! > > Does someone know why ffmpeg doesn't want the option force_divisible:by? > > With best Wished > > Try:
ffmpeg -i video.MTS -vf scale=720:-2 -c:v libx264 -crf 20 -c:a copy -y padded.MTS Change -crf 20 up or down to suit quality and/or file size. Regards Peter _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
