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EC2 for video-encoding

3 mars 2022, par Naftuli Kay

I have a potential job which will require me to do some video encoding with FFMPEG and x264. I'll have a series of files which I'll need to encode once, then I'll be able to bring down the instances. Since I'm not really sure of the resource utilization of x264 and FFMPEG, what kind of instances should I get? I'm thinking either a

High-CPU Extra Large Instance

7 GB of memory
20 EC2 Compute Units (8 virtual cores with 2.5 EC2 Compute Units each)
1690 GB of instance storage
64-bit platform
I/O Performance: High
API name: c1.xlarge

or, alternatively a

Cluster GPU Quadruple Extra Large Instance

22 GB of memory
33.5 EC2 Compute Units (2 x Intel Xeon X5570, quad-core “Nehalem” architecture)
2 x NVIDIA Tesla “Fermi” M2050 GPUs
1690 GB of instance storage
64-bit platform
I/O Performance: Very High (10 Gigabit Ethernet)
API name: cg1.4xlarge

What should I use? Does x264/FFMPEG perform better with faster/more CPUs or does it really pound the GPU more? In any case, it seems that the Cluster GPU seems to be the higher performance instance. What should I prefer?
How to encode an mp4 to the exact specs of another mp4 with FFMPEG

15 décembre 2021, par BCooper
I'm working on a batch file to concatenate 3 files together, as follows:
```
1_Intro_Bumper.mp4,
2_Session.mp4,
3_Outro_Bumper.mp4
```
I've run into problems with the session.mp4 having slightly different specs, causing the concat to have weird problems with speed/sync/etc, and found out that if I encode the Bumpers through Handbrake to the exact specs of the Session, then the concat works great.

My question is: Can I bypass Handbrake here and include a line in my batch file to encode the Intro and Outro Bumpers to the exact specs of the Session?

Here's my current batch file:
```
:: Create File List

for %%i in (*.mp4) do echo file '%%i'>> mylist.txt

:: Concatenate Files

ffmpeg -f concat -safe 0 -i mylist.txt -c copy output.mp4

:: Encode to x264

ffmpeg -i output.mp4 output_x264.mp4
```
Thanks!

build x264 failed on apple M1, No working C compiler found

29 novembre 2021, par louxiu

Apple M1, clang

Apple clang version 13.0.0 (clang-1300.0.29.3)
Target: arm64-apple-darwin21.1.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

x264 version x264-snapshot-20191217-2245
configure

 ./configure --prefix=/tmp/  --enable-static

config.log

checking for -Werror=unknown-warning-option... yes
checking for -mdynamic-no-pic... yes
x264 configure script
Command line options: "--prefix=/tmp/" "--enable-static"

checking whether gcc works... no
Failed commandline was:
--------------------------------------------------
gcc conftest.c  -Wall -I. -I$(SRCPATH) -mdynamic-no-pic -arch armv7  -Werror=unknown-warning-option    -lm -arch armv7 -o conftest
ld: warning: ignoring file /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/13.0.0/lib/darwin/libclang_rt.osx.a, missing required architecture armv7 in file /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/13.0.0/lib/darwin/libclang_rt.osx.a (5 slices)
ld: warning: ignoring file /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/lib/libm.tbd, missing required architecture armv7 in file /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/lib/libm.tbd (3 slices)
ld: warning: ignoring file /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/lib/libSystem.tbd, missing required architecture armv7 in file /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/lib/libSystem.tbd (3 slices)
ld: dynamic main executables must link with libSystem.dylib for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)
--------------------------------------------------
Failed program was:
--------------------------------------------------
int main (void) {  return 0; }
--------------------------------------------------
DIED: No working C compiler found.

ffmpeg-python video conversion error : malloc of size 36254012 failed on Raspberry Pi

23 novembre 2021, par Bob Smith
I am trying to convert a .mkv file into .mp4 format using the ffmpeg-python python library. I have been able to run my script on a Windows machine repeatedly without any issues, however when I run the same script on a Raspberry Pi 4 B I am faced with the same error again and again. Similar to this post, I am faced with the following message:
```
x264 [error]: malloc of size 36254012 failed
Video encoding failed
```
I have tried setting max_muxing_queue_size to 9999 as heard this might fix the issue, it had no effect. I tried increasing the gpu RAM from the default 128 MB to as much as 512 MB (I have the 8 GB RAM model so I was not concerned about overall system memory), needless to say this had no effect either.

Finally, I read on a forumn post from someone else with the same error that decresing the number of threads ffmpeg uses to 1 might also solve this issue. This did in fact solve my problem, unfortunately it decreases the speed of the process to a crawl of what it would otherwise be. I was hoping someone might have another idea of how to fix this that would still allow for multiple threads to be used by ffmpeg, or at least have some idea as to what might be causing this issue.

Also it's not particularly useful, but for reference the line that is causing the exception in the code is the following:
```
ffmpeg.input(video_file).output(out_name, **{'max_muxing_queue_size': '9999'}).run()
```

FFmpeg libxh264 error on Slackware current

22 novembre 2021, par unixbhaskar

Well, here are specs which gives you heads up before suggesting ...

bhaskar@Slackware_06:46:54_Sat Nov 20: :~>ffmpeg -codecs | grep h264
ffmpeg version 4.4.1 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 11.2.0 (GCC)
  configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --docdir=/usr/doc/ffmpeg-4.4.1/html --mandir=/usr/man --disable-debug --enable-shared --disable-static --enable-gpl --enable-version3 --enable-avresample --arch=x86_64 --disable-encoder=aac --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-gnutls --enable-libbluray --enable-libcaca --enable-libcdio --enable-frei0r --enable-openal --enable-libopus --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libmp3lame --enable-opencl --enable-opengl --enable-libopenjpeg --enable-libpulse --enable-libsmbclient --enable-libxml2 --enable-librsvg --enable-libdrm
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
 DEV.LS h264                 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (decoders: h264 h264_v4l2m2m ) (encoders: h264_v4l2m2m h264_vaapi )

Also

ffmpeg version 4.4.1 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 11.2.0 (GCC)
  configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --docdir=/usr/doc/ffmpeg-4.4.1/html --mandir=/usr/man --disable-debug --enable-shared --disable-static --enable-gpl --enable-version3 --enable-avresample --arch=x86_64 --disable-encoder=aac --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-gnutls --enable-libbluray --enable-libcaca --enable-libcdio --enable-frei0r --enable-openal --enable-libopus --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libmp3lame --enable-opencl --enable-opengl --enable-libopenjpeg --enable-libpulse --enable-libsmbclient --enable-libxml2 --enable-librsvg --enable-libdrm
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, alsa, from 'pulse':
  Duration: N/A, start: 1637371168.782400, bitrate: 1536 kb/s
  Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
[x11grab @ 0x87db00] Stream #0: not enough frames to estimate rate; consider increasing probesize
Input #1, x11grab, from ':0':
  Duration: N/A, start: 1637371168.825367, bitrate: 839270 kb/s
  Stream #1:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1366x768, 839270 kb/s, 25 fps, 1000k tbr, 1000k tbn, 1000k tbc
Unknown encoder 'libx264'

And ..

bhaskar@Slackware_06:50:02_Sat Nov 20: :~>uname -a
Linux Slackware 5.15.1-Slackware #1 SMP Sun Nov 7 10:48:30 IST 2021 x86_64 Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz GenuineIntel GNU/Linux
bhaskar@Slackware_06:50:04_Sat Nov 20: :~>cat /etc/os-release
───────┬──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
       │ File: /etc/os-release
───────┼──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
   1   │ NAME=Slackware
   2   │ VERSION="15.0"
   3   │ ID=slackware
   4   │ VERSION_ID=15.0
   5   │ PRETTY_NAME="Slackware 15.0 x86_64"
   6   │ ANSI_COLOR="0;34"
   7   │ CPE_NAME="cpe:/o:slackware:slackware_linux:15.0"
   8   │ HOME_URL="http://slackware.com/"
   9   │ SUPPORT_URL="http://www.linuxquestions.org/questions/slackware-14/"
  10   │ BUG_REPORT_URL="http://www.linuxquestions.org/questions/slackware-14/"
  11   │ VERSION_CODENAME=stable

Wondering .....when try to build it like mentioned in this place :

https://www.linuxquestions.org/questions/slackware-14/ffmpeg-unknown-encoder-%27libx264%27-4175677695/#post6140669

Am I the only one , who failed to understand ,why the heck is not detecting ??

Also,

root@Slackware_06:52:59_Sat Nov 20:~#ldconfig -p | grep libxh264
root@Slackware_06:53:12_Sat Nov 20:~#ldconfig -p | grep h264
root@Slackware_06:54:18_Sat Nov 20:~#ls /usr/lib64/libxh2*
ls: cannot access '/usr/lib64/libxh2*': No such file or directory
root@Slackware_06:54:46_Sat Nov 20:~#ls /usr/lib/libx2*
ls: cannot access '/usr/lib/libx2*': No such file or directory

Finally....also

bhaskar@Slackware_06:56:58_Sat Nov 20: :~>ffmpeg -encoders | grep h264
ffmpeg version 4.4.1 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 11.2.0 (GCC)
  configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --docdir=/usr/doc/ffmpeg-4.4.1/html --mandir=/usr/man --disable-debug --enable-shared --disable-static --enable-gpl --enable-version3 --enable-avresample --arch=x86_64 --disable-encoder=aac --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-gnutls --enable-libbluray --enable-libcaca --enable-libcdio --enable-frei0r --enable-openal --enable-libopus --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libmp3lame --enable-opencl --enable-opengl --enable-libopenjpeg --enable-libpulse --enable-libsmbclient --enable-libxml2 --enable-librsvg --enable-libdrm
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
 V..... h264_v4l2m2m         V4L2 mem2mem H.264 encoder wrapper (codec h264)
 V....D h264_vaapi           H.264/AVC (VAAPI) (codec h264)

Greatly appreciated if you come close or pinpoint the reason.

Thanks.

1 | ... | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | ... | 129

Newest 'x264' Questions - Stack Overflow

Les articles publiés sur le site

EC2 for video-encoding

How to encode an mp4 to the exact specs of another mp4 with FFMPEG

build x264 failed on apple M1, No working C compiler found

ffmpeg-python video conversion error : malloc of size 36254012 failed on Raspberry Pi

FFmpeg libxh264 error on Slackware current

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