Re: [FFmpeg-user] Getting audio correct (Zoom meeting)
On 8/15/2020 3:14 AM, Cecil Westerhof wrote:
I understood that there are different ways to record Zoom meetings. (I
am not doing it myself, I only get the results.) I found that what I
got was extremely small. (A video of six minutes only took 56.7 MB.)
What would be the best way to record Zoom meetings so they can be
processed by ffmpeg the best?
There are some settings ("Optimize for 3rd party video editor"), but in
general zoom compresses for space, not quality.
Another option is to use some screen-capture software and record it that way.
z!
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Re: [FFmpeg-user] Compression is a lot smaller
Simon Roberts writes: > On Sat, Aug 15, 2020 at 5:01 AM Cecil Westerhof wrote: > >> Through scripts I use ffmpeg for cutting and compressing videos and >> sometimes adding a watermark. Nothing fancy, but handy. >> >> In the past the original file was between 4 to 13 times bigger as the >> compressed file. Today I compressed a few files again. The compression >> was almost non existing to less as three. >> > > [...] > > >> > > What could be happening here? > > > The most immediate thought is that zoom improved their compression > algorithm and now there's not so much room left for a secondary > improvement. > > You might want to take a look at the original, perhaps using ffprobe, to > determine what codec was used, and what bitrate it started out with. No, that is not the case. These where videos I shot with my Sony handycam. So uncompressed files. But maybe I should have described it a bit clearer. But there is nothing inherently wrong with the way I call ffmpeg? -- Cecil Westerhof Senior Software Engineer LinkedIn: http://www.linkedin.com/in/cecilwesterhof ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] Putting in a picture half-way through the video
Simon Roberts writes: > On Sat, Aug 15, 2020 at 4:07 AM Cecil Westerhof wrote: > >> I have to publish the video's from our Zoom meetings. Something went >> wrong. Halfway a recording the recording went from the speaker to the >> overview screen. I like to change the part of the video with the >> overview screen (people do not know they are being recorded and not >> everything is very flattering) with a static picture. Is this doable? >> (Without to much work.) >> > > This (and the audio sync issue you describe elsewhere) seems to me to be a > job far better suited to an actual video editor since you can perform these > actions interactively. > > Lightworks (lwks.com) is extremely powerful, free for output 720 or lower, > and works on Linux, Mac, and PC. There are many others that are free too > for the various platforms. I really do not like to use file editing tools. Until now I managed quit sufficiently with scripts that called ffmpeg, but maybe it is time to bite the bullet. -- Cecil Westerhof Senior Software Engineer LinkedIn: http://www.linkedin.com/in/cecilwesterhof ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] Putting in a picture half-way through the video
On Sat, Aug 15, 2020 at 4:07 AM Cecil Westerhof wrote: > I have to publish the video's from our Zoom meetings. Something went > wrong. Halfway a recording the recording went from the speaker to the > overview screen. I like to change the part of the video with the > overview screen (people do not know they are being recorded and not > everything is very flattering) with a static picture. Is this doable? > (Without to much work.) > This (and the audio sync issue you describe elsewhere) seems to me to be a job far better suited to an actual video editor since you can perform these actions interactively. Lightworks (lwks.com) is extremely powerful, free for output 720 or lower, and works on Linux, Mac, and PC. There are many others that are free too for the various platforms. Just my $0.02 Cheers, Simon ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] Compression is a lot smaller
On Sat, Aug 15, 2020 at 5:01 AM Cecil Westerhof wrote: > Through scripts I use ffmpeg for cutting and compressing videos and > sometimes adding a watermark. Nothing fancy, but handy. > > In the past the original file was between 4 to 13 times bigger as the > compressed file. Today I compressed a few files again. The compression > was almost non existing to less as three. > [...] > What could be happening here? The most immediate thought is that zoom improved their compression algorithm and now there's not so much room left for a secondary improvement. You might want to take a look at the original, perhaps using ffprobe, to determine what codec was used, and what bitrate it started out with. > > ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] When cutting part of video I get a silence part before it
Cecil Westerhof writes:
Some logging of the problem.
When I use:
ffmpeg -y -ss 61 -i zoom_4.mp4 -to 469 -acodec copy -vcodec copy -async 1
4_compressed.mp4
The video starts with 26 seconds (of negative time stamped) silent
video.
The log:
ffmpeg version 4.1.6-1~deb10u1 Copyright (c) 2000-2020 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
libavformat58. 20.100 / 58. 20.100
libavdevice58. 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
libpostproc55. 3.100 / 55. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'zoom_4.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
creation_time : 2020-07-31T20:26:28.00Z
Duration: 00:08:54.24, start: 0.00, bitrate: 480 kb/s
Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 32000 Hz, mono,
fltp, 49 kb/s (default)
Metadata:
creation_time : 2020-07-31T20:26:28.00Z
handler_name: AAC audio
Stream #0:1(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
640x360, 429 kb/s, 25 fps, 25 tbr, 30k tbn, 60k tbc (default)
Metadata:
creation_time : 2020-07-31T20:26:28.00Z
handler_name: H.264/AVC video
encoder : AVC Coding
Output #0, mp4, to '4_compressed.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
encoder : Lavf58.20.100
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
640x360, q=2-31, 429 kb/s, 25 fps, 25 tbr, 30k tbn, 30k tbc (default)
Metadata:
creation_time : 2020-07-31T20:26:28.00Z
handler_name: H.264/AVC video
encoder : AVC Coding
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 32000 Hz, mono,
fltp, 49 kb/s (default)
Metadata:
creation_time : 2020-07-31T20:26:28.00Z
handler_name: AAC audio
Stream mapping:
Stream #0:1 -> #0:0 (copy)
Stream #0:0 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame=12391 fps=0.0 q=-1.0 Lsize= 29113kB time=00:07:48.98 bitrate=
508.5kbits/s speed=1.89e+03x
video:25861kB audio:2973kB subtitle:0kB other streams:0kB global
headers:0kB muxing overhead: 0.970170%
What could be the problem?
> In the past I had sometimes the following strange problem. When
> cutting a part out of a video with:
> ffmpeg -y\
>-ss "${startSeconds}" \
>-i "${INPUT_FILE}" \
>-to "$((stopSeconds - startSeconds))" \
>-acodec copy \
>-vcodec copy \
>-async 1 \
>"${OUTPUT_FILE}"
>
> sometimes before the selected video was put something extra that was
> silent and had a negative time index.
>
> At a certain point I found out that it had to do when compressing the
> file with:
> ffmpeg -y \
> -i "${_inputfile}" \
> -vcodec libx264 \
> -crf 23 \
> -acodec libmp3lame \
> -preset veryfast \
> "${_outputfile}"
>
> The reason that I did this was that the original file was between four
> to thirteen times bigger, without me seeing a quality loss.
> Most of the times I did not have this problem,
[FFmpeg-user] Compression is a lot smaller
Through scripts I use ffmpeg for cutting and compressing videos and sometimes adding a watermark. Nothing fancy, but handy. In the past the original file was between 4 to 13 times bigger as the compressed file. Today I compressed a few files again. The compression was almost non existing to less as three. 454 -> 415 503 -> 230 490 -> 254 462 -> 157 497 -> 197 454 -> 174 Some logging of the worst (the first): nice -n 10 ionice -c3 ffmpeg -y -i 00039.MTS -vcodec libx264 -crf 23 -acodec libmp3lame -preset veryfast 00039.mp4 ffmpeg version 4.1.6-1~deb10u1 Copyright (c) 2000-2020 the FFmpeg developers built with gcc 8 (Debian 8.3.0-6) . . . libavutil 56. 22.100 / 56. 22.100 libavcodec 58. 35.100 / 58. 35.100 libavformat58. 20.100 / 58. 20.100 libavdevice58. 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 libpostproc55. 3.100 / 55. 3.100 Input #0, mpegts, from '00039.MTS': Duration: 00:02:49.02, start: 1.04, bitrate: 22533 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 (ac3 (native) -> mp3 (libmp3lame)) Press [q] to stop, [?] for help [libx264 @ 0x563820eef380] using SAR=1/1 [libx264 @ 0x563820eef380] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX XOP FMA3 BMI1 [libx264 @ 0x563820eef380] profile High, level 4.0 [libx264 @ 0x563820eef380] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=2 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=6 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=1 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=10 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 '00039.mp4': Metadata: encoder : Lavf58.20.100 Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 12800 tbn, 25 tbc Metadata: encoder : Lavc58.35.100 libx264 Side data: cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1 Stream #0:1: Audio: mp3 (libmp3lame) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp Metadata: encoder : Lavc58.35.100 libmp3lame . . . video:421739kB audio:2642kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.027043% [libx264 @ 0x563820eef380] frame I:23Avg QP:24.52 size:417042 [libx264 @ 0x563820eef380] frame P:1621 Avg QP:26.67 size:165193 [libx264 @ 0x563820eef380] frame B:2581 Avg QP:30.40 size: 59857 [libx264 @ 0x563820eef380] consecutive B-frames: 8.0% 29.4% 6.3% 56.2% [libx264 @ 0x563820eef380] mb I I16..4: 3.2% 19.9% 76.8% [libx264 @ 0x563820eef380] mb P I16..4: 1.1% 5.9% 3.6% P16..4: 45.3% 16.5% 19.4% 0.0% 0.0%skip: 8.3% [libx264 @ 0x563820eef380] mb B I16..4: 0.2% 0.8% 0.1% B16..8: 20.0% 9.5% 3.8% direct:24.2% skip:41.5% L0:20.1% L1:34.8% BI:45.1% [libx264 @ 0x563820eef380] 8x8 transform intra:54.1% inter:41.3% [libx264 @ 0x563820eef380] coded y,uvDC,uvAC intra: 84.1% 74.6% 39.9% inter: 43.9% 18.0% 3.8% [libx264 @ 0x563820eef380] i16 v,h,dc,p: 38% 29% 21% 12% [libx264 @ 0x563820eef380] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 22% 23% 5% 5% 5% 6% 5% 9% [libx264 @ 0x563820eef380] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 10% 36% 14% 5% 6% 5% 8% 5% 11% [libx264 @ 0x563820eef380] i8c dc,h,v,p: 45% 25% 19% 12% [libx264 @ 0x563820eef380] Weighted P-Frames: Y:5.9% UV:2.7% [libx264 @ 0x563820eef380] kb/s:20443.06 What could be happening here? When I need to provide more information: let me know. -- Cecil Westerhof Senior Software Engineer LinkedIn: http://www.linkedin.com/in/cecilwesterhof ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
[FFmpeg-user] When cutting part of video I get a silence part before it
In the past I had sometimes the following strange problem. When
cutting a part out of a video with:
ffmpeg -y\
-ss "${startSeconds}" \
-i "${INPUT_FILE}" \
-to "$((stopSeconds - startSeconds))" \
-acodec copy \
-vcodec copy \
-async 1 \
"${OUTPUT_FILE}"
sometimes before the selected video was put something extra that was
silent and had a negative time index.
At a certain point I found out that it had to do when compressing the
file with:
ffmpeg -y \
-i "${_inputfile}" \
-vcodec libx264 \
-crf 23 \
-acodec libmp3lame \
-preset veryfast \
"${_outputfile}"
The reason that I did this was that the original file was between four
to thirteen times bigger, without me seeing a quality loss.
Most of the times I did not have this problem, but sometimes I did.
When first cutting the video and then compressing it I did not have
this problem.
Sadly the problem emerged again. :'-(
I have to publish recordings of a Zoom meeting. They are very small
(not even 10 MB pro minute) and I got the same problem. I have to
generate some logging (I use ffmpeg through bash and tcl scripts), but
was wondering if somebody knows what could generate this kind of
problems and what to do about it.
I will later on share some logging.
--
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof
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Re: [FFmpeg-user] Getting audio correct (Zoom meeting)
Cecil Westerhof writes: > I have to publish zoom recordings. One of the problems is that audio > is out of sync. And it is different for the different recordings. It > goes from something I notice because I am a nitpicker, to something I > think will annoy everyone. > Is that something that is just part of recording Zoom meetings > (hardware and internet connection of the sender), or can it be mend > without to much difficulty? I understood that there are different ways to record Zoom meetings. (I am not doing it myself, I only get the results.) I found that what I got was extremely small. (A video of six minutes only took 56.7 MB.) What would be the best way to record Zoom meetings so they can be processed by ffmpeg the best? -- Cecil Westerhof Senior Software Engineer LinkedIn: http://www.linkedin.com/in/cecilwesterhof ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
[FFmpeg-user] Putting in a picture half-way through the video
I have to publish the video's from our Zoom meetings. Something went wrong. Halfway a recording the recording went from the speaker to the overview screen. I like to change the part of the video with the overview screen (people do not know they are being recorded and not everything is very flattering) with a static picture. Is this doable? (Without to much work.) -- Cecil Westerhof Senior Software Engineer LinkedIn: http://www.linkedin.com/in/cecilwesterhof ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
[FFmpeg-user] Getting audio correct (Zoom meeting)
I have to publish zoom recordings. One of the problems is that audio is out of sync. And it is different for the different recordings. It goes from something I notice because I am a nitpicker, to something I think will annoy everyone. Is that something that is just part of recording Zoom meetings (hardware and internet connection of the sender), or can it be mend without to much difficulty? -- Cecil Westerhof Senior Software Engineer LinkedIn: http://www.linkedin.com/in/cecilwesterhof ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
