[FFmpeg-user] Encoding Warnings
Ruler2112
Ruler2112 at charter.net
Fri Jun 26 22:56:08 EEST 2020
Hello everybody. Even though I've used ffmpeg for over 20 years, this will
be my first post to the mailing list.
I get videos from a variety of sources - youtube, vimeo, DVR, DVDs I've
purchased, etc. They're in a wide variety of different formats, many of
which my TVs/DVRs over the years have refused to play. The volume also
varies wildly between sources - DVR is fine, but anything from outside can
either be so quiet I have to crank the volume up to max to have any chance
at hearing it or be blasted out of the room if I don't have it set on
minimum. Because of this, I wrote a batch file to process each video. I
simply drop the raw files in a todo folder, run the batch file, and it would
do everything from there. The resolution/frame rate is read with MediaInfo,
calculations done internally, then video is reprocessed with ffmpeg, the
audio is dumped to a wave with ffmpeg and then had processing done on it to
standardize the volume, and the two resulting files were then remuxed with
VirtualDub. (I know ffmpeg should have been able to do it and frankly do
not remember why I made it like this - it was 15 years ago when I wrote it
after all.) The output has XVID video with CBR MP3 audio with large
resolutions scaled down to a maximum I specified which has played perfectly
on everything I've thrown them at. The script has worked awesome for years.
The problem now is that the windows machine I've been running it on has died
of a faulty motherboard. Frankly, I moved on from windows many years ago
and that one XP box was kept solely for running this program. I'd rather
not replace it with another windows machine if I can help it, so have been
working to re-write the batch files as a perl script and utilizing ffmpeg
exclusively to do the heavy lifting. This has gone extremely well and
everything seems to be working fine with a couple exceptions.
First, the volume standardization program was also windows only. I
contacted the author and got the source code. Even though I hadn't touched
C since college, adapting it to work on Linux wasn't too bad and it's now
functional. :)
Second are the ffmpeg warnings/errors. I've spent over two days looking for
solutions to the various problems and have solved everything except a
couple. I do not know if they're related to the version of ffmpeg being so
much newer than the one that was running on the XP machine or what, but I
don't know what else to try. I'm hoping someone can help me iron them out.
The version of ffmpeg on the XP box (according to the output when running it
through WINE) is:
ffmpeg version N-78758-g5156578 Copyright (c) 2000-2016 the FFmpeg
developers
built with gcc 5.3.0 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads
--enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r
--enable-gnutls --enable-iconv --enable-libass --enable-libbluray
--enable-libbs2b
--enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme
--enable-libgsm
--enable-libilbc --enable-libmodplug --enable-libmp3lame
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
--enable-libopus
--enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex
--enable-libtheora --enable-libtwolame --enable-libvidstab
--enable-libvo-amrwbenc
--enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp
--enable-libx264
--enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg
--enable-lzma
--enable-decklink --enable-zlib
libavutil 55. 19.100 / 55. 19.100
libavcodec 57. 27.100 / 57. 27.100
libavformat 57. 26.100 / 57. 26.100
libavdevice 57. 0.101 / 57. 0.101
libavfilter 6. 37.100 / 6. 37.100
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
The version on the Linux machine is:
ffmpeg version 4.3-static https://johnvansickle.com/ffmpeg/ Copyright (c)
2000-2020 the FFmpeg developers
built with gcc 8 (Debian 8.3.0-6)
configuration: --enable-gpl --enable-version3 --enable-static
--disable-debug --disable-ffplay --disable-indev=sndio
--disable-outdev=sndio --cc=gcc --enable-fontconfig --enable-frei0r
--enable-gnutls --enable-gmp --enable-libgme --enable-gray --enable-libaom
--enable-libfribidi --enable-libass --enable-libvmaf --enable-libfreetype
--enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb
--enable-libopenjpeg --enable-librubberband --enable-libsoxr
--enable-libspeex --enable-libsrt --enable-libvorbis --enable-libopus
--enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc
--enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265
--enable-libxml2 --enable-libdav1d --enable-libxvid --enable-libzvbi
--enable-libzimg
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
libswscale 5. 7.100 / 5. 7.100
libswresample 3. 7.100 / 3. 7.100
libpostproc 55. 7.100 / 55. 7.100
The commands the script runs are:
Step 1: Reprocess Video, 2 Pass Encoding
/usr/local/bin/ffmpeg -threads 8 -dn -i "/home/me/media/proc/input.mp4" -dn
-pass 1 -passlogfile "/home/me/media/proc/input.log" -f avi -vcodec mpeg4
-vtag XVID -maxrate 2000k -b:v 1500k -mbd 2 -bf 2 -flags -aic -cmp 2 -subcmp
2 -g 300 -an -s 720:400 -aspect 1.7777 -vf "setdar=1.7777" -metadata
ISFT="Rulers Scripts" "/home/me/media/proc/pass1.avi"
Output:
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/me/media/proc/input.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf56.25.101
Duration: 00:47:53.92, start: 0.000000, bitrate: 1037 kb/s
Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 /
0x31637661), yuv420p, 720x400 [SAR 80:81 DAR 16:9], 905 kb/s, 25 fps, 25
tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo,
fltp, 128 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> mpeg4 (native))
Press [q] to stop, [?] for help
[mpeg4 @ 0x7357d40] Automatically choosing VBV buffer size of 160 kbyte
Output #0, avi, to '/home/me/media/proc/pass1.avi':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
ISFT : Lavf58.45.100
Stream #0:0(eng): Video: mpeg4 (XVID / 0x44495658), yuv420p, 720x400
[SAR 80:81 DAR 16:9], q=2-31, 1500 kb/s, 25 fps, 25 tbn, 25 tbc (default)
Metadata:
handler_name : VideoHandler
encoder : Lavc58.91.100 mpeg4
Side data:
cpb: bitrate max/min/avg: 2000000/0/1500000 buffer size: 1310720
vbv_delay: N/A
frame=71847 fps=220 q=2.5 Lsize= 527334kB time=00:47:53.84
bitrate=1503.2kbits/s speed=8.79x
video:525609kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.328167%
Step 1b: Second Pass
/usr/local/bin/ffmpeg -threads 8 -dn -i "/home/me/media/proc/input.mp4" -dn
-pass 2 -passlogfile "/home/me/media/proc/input.log" -f avi -vcodec mpeg4
-vtag XVID -maxrate 2000k -b:v 1500k -mbd 2 -bf 2 -flags -aic -cmp 2 -subcmp
2 -g 300 -an -s 720:400 -aspect 1.7777 -vf "setdar=1.7777" -metadata
ISFT="Rulers Scripts" "/home/me/media/proc/pass2.avi"
Output:
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/me/media/proc/input.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf56.25.101
Duration: 00:47:53.92, start: 0.000000, bitrate: 1037 kb/s
Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 /
0x31637661), yuv420p, 720x400 [SAR 80:81 DAR 16:9], 905 kb/s, 25 fps, 25
tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo,
fltp, 128 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> mpeg4 (native))
Press [q] to stop, [?] for help
[mpeg4 @ 0x6784c00] Automatically choosing VBV buffer size of 160 kbyte
Output #0, avi, to '/home/me/media/proc/pass2.avi':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
ISFT : Rulers Scripts
Stream #0:0(eng): Video: mpeg4 (XVID / 0x44495658), yuv420p, 720x400
[SAR 80:81 DAR 16:9], q=2-31, 1500 kb/s, 25 fps, 25 tbn, 25 tbc (default)
Metadata:
handler_name : VideoHandler
encoder : Lavc mpeg4
Side data:
cpb: bitrate max/min/avg: 2000000/0/1500000 buffer size: 1310720
vbv_delay: N/A
frame=71847 fps=219 q=2.7 Lsize= 527998kB time=00:47:53.84
bitrate=1505.1kbits/s speed=8.77x
video:526274kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.327711%
Step 2: Dump Wave file
/usr/local/bin/ffmpeg -threads 8 -i "/home/me/media/proc/input.mp4" -dn -vn
-ar 44100 -ac 2 "/home/me/media/proc/sound.avi"
Output:
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/me/media/proc/input.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf56.25.101
Duration: 00:47:53.92, start: 0.000000, bitrate: 1037 kb/s
Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 /
0x31637661), yuv420p, 720x400 [SAR 80:81 DAR 16:9], 905 kb/s, 25 fps, 25
tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo,
fltp, 128 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream mapping:
Stream #0:1 -> #0:0 (aac (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, wav, to '/home/me/media/proc/sound.wav':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
ISFT : Lavf58.45.100
Stream #0:0(eng): Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz,
stereo, s16, 1411 kb/s (default)
Metadata:
handler_name : SoundHandler
encoder : Lavc58.91.100 pcm_s16le
size= 495072kB time=00:47:53.88 bitrate=1411.2kbits/s speed= 474x
video:0kB audio:495072kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.000015%
Step 3: Standardize Volume
Not performed by ffmpeg, but confirmed to work and modify the amplitude of
the wave file while keeping the same format.
Step 4: Remux Video & Audio
/usr/local/bin/ffmpeg -threads 8 -re -i "/home/me/media/proc/pass2.avi" -re
-i "/home/me/media/proc/sound.wav" -vcodec copy -acodec mp3 -b:a 128k -ar
44100 -ac 2 -use_wallclock_as_timestamps 1 -bitexact -metadata ISFT="Rulers
Scripts" "/home/me/media/proc/output.avi"
Output:
Input #0, avi, from '/home/me/media/proc/pass2.avi':
Metadata:
encoder : Rulers Scripts
Duration: 00:47:53.88, start: 0.000000, bitrate: 1505 kb/s
Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658),
yuv420p, 720x400 [SAR 80:81 DAR 16:9], 1500 kb/s, 25 fps, 25 tbr, 25 tbn, 25
tbc
Guessed Channel Layout for Input Stream #1.0 : stereo
Input #1, wav, from '/home/me/media/proc/sound.wav':
Metadata:
encoder : Lavf58.45.100
Duration: 00:47:53.89, bitrate: 1411 kb/s
Stream #1:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo,
s16, 1411 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #1:0 -> #0:1 (pcm_s16le (native) -> mp3 (libmp3lame))
Press [q] to stop, [?] for help
Output #0, avi, to '/home/me/media/proc/output.avi':
Metadata:
ISFT : Rulers Scripts
Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658),
yuv420p, 720x400 [SAR 80:81 DAR 16:9], q=2-31, 1500 kb/s, 25 fps, 25 tbr, 25
tbn, 25 tbc
Stream #0:1: Audio: mp3 (libmp3lame) (U[0][0][0] / 0x0055), 44100 Hz,
stereo, s16p, 128 kb/s
Metadata:
encoder : Lavc libmp3lame
[avi @ 0x6611d80] Timestamps are unset in a packet for stream 0. This is
deprecated and will stop working in the future. Fix your code to set the
timestamps properly
frame= 2196 fps=1368 q=-1.0 Lsize= 17854kB time=00:01:27.95
bitrate=1662.9kbits/s speed=54.8x
video:16338kB audio:1375kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.798442%
The two lines that are concerning to me are:
'Guessed Channel Layout for Input Stream #1.0 : stereo'
Of course it's stereo - I jump dumped it to a 2-channel wave in the step 2!
:) I'm guessing that I can safely ignore this one, but am not certain. It
is being produced by the audio stream as if I encode directly to an MP3 with
no video, it says the same thing, even if I specify -ac 2 before the -i for
the wave file. Is ignoring it being OK without causing trouble a correct
assumption? If so, is there a way to silence the warning or should I just
live with it? If not, could somebody point me in the right direction on how
to fix it?
'Timestamps are unset in a packet for stream 0. This is deprecated and
will stop working in the future. Fix your code to set the timestamps
properly'
This one on the other hand, I am concerned about. I've searched online and
have repeated the entire process with the following options:
'-use_wallclock_as_timestamps 1'
'-fflags +genpts'
I used the first option without '-re' before the input specifications and
later with them. (And boy, does -re ever slow down processing!) I tried
the second on it's own, then in conjunction with the first, first without
-re & then with it. Everything I do results in the same warning, even
though ffmpeg is what produced the AVI being used as the video source in the
muxing process.
>From the sound of it, there's something wrong that should be fixed, but I
cannot seem to figure out what it is or how to fix it. Like I said, ffmpeg
produced the AVI file it's now complaining about & these are the same
commands that worked fine in the older version of ffmpeg that the XP box was
running. If I mux the two files together with VirtualDub on my windows
machine at work, there are no warnings like this. I've scoured the internet
& mailing lists and have found many people running into the same type of
warning messages, but little help other than to add one or the other of the
above options to fix it. (Which of course does not work for me.)
Please help - these are the last issues (that I know of) which stand in the
way of getting this processing script working 100% on Linux.
--
Sent from: http://www.ffmpeg-archive.org/
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