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How to specify a fractional framerate with ffmpeg C/C++ when stitching together images ?
14 septembre 2022, par TurgutI want to specify fractional frame rate's like
23.797or59.94when creating my encoder. Here is how I do it currently :

AVStream* st;
...
st->time_base = (AVRational){1, STREAM_FRAME_RATE };


But looking at ffmpeg's source code at
rational.hwe can see thatAVRationalstruct takes int's instead of float's. So my23.797turns into 23 thus encoding wrong. How can I specify fps with floating numbers ?

-
Cryptic `ffmpeg` + Python error : `Cannot find a matching stream for unlabeled input pad 0 on filter Parsed_crop_1`
5 août 2022, par mattze_frischI want to use
ffmpegwith Python in a Jupyter notebook to create a video from 2000 PNG image files generated bymatplotlib. I'm on a Windows 7 machine.

The frames are very narrow and high, so I'd like to cut them vertically into seven equal-sized "tiles" using
cropand stacked those "tiles" horizontally usinghstack, but I'm getting only getting cryptic error messages :

ffmpeg_path = notebook_directory # Make sure ffmpeg.exe is in notebook directory!

frames_path = 'C:\\Users\\Username\\Desktop'
frames_renamed_path = os.path.join(frames_path, 'renamed')
os.chdir(frames_renamed_path) # Temporarily change current working directory

check_call(
 [
 os.path.join(ffmpeg_path, 'ffmpeg'),
 '-y', # Overwrite output files without asking
 '-report', # Write logfile to current working directory
 '-hwaccel', 'cuda', # Use GPU acceleration
 '-framerate', '60', # Input frame rate
 '-i', os.path.join(frames_renamed_path, 'frame%05d.png'), # Path to input frames
 #'-r', '60', # Output frame rate
 #'-vf', 'pad=ceil(iw/2)*2:ceil(ih/2)*2', # Pad frames to even pixel numbers (required by many codecs)
 #'-pix_fmt', 'yuv420p',
 '-pix_fmt', 'rgb32', # Use RGB32 pixel format matching MatPlotLib image output
 '-filter_complex', # Cut frames into tiles and rearrange (here: 7 horizontal tiles)
 'crop=in_w:in_h/7:0:0[tile_1],' # 1st tile from top
 + 'crop=in_w:in_h/7:0:in_h*1/7[tile_2],' # 2nd tile from top
 + 'crop=in_w:in_h/7:0:in_h*2/7[tile_3],' # 3rd tile from top
 + 'crop=in_w:in_h/7:0:in_h*3/7[tile_4],' # 4th tile from top
 + 'crop=in_w:in_h/7:0:in_h*4/7[tile_5],' # 5th tile from top
 + 'crop=in_w:in_h/7:0:in_h*5/7[tile_6],' # 6th tile from top
 + 'crop=in_w:in_h/7:0:in_h*6/7[tile_7],' # 7th tile from top
 + '[tile_1][tile_2][tile_3][tile_4][tile_5][tile_6][tile_7]hstack=7', # Stack tiles horizontally
 os.path.join(frames_renamed_path, 'video.mp4') # Path to store output video
 ]
)

os.chdir(notebook_directory) # Reset current working directory to notebook directory

---------------------------------------------------------------------------
CalledProcessError Traceback (most recent call last)
Input In [10], in <cell 9="9">()
 6 frames_renamed_path = os.path.join(frames_path, 'renamed')
 7 os.chdir(frames_renamed_path) # Temporarily change current working directory
----> 9 check_call(
 10 [
 11 os.path.join(ffmpeg_path, 'ffmpeg'),
 12 '-y', # Overwrite output files without asking
 13 '-report', # Write logfile to current working directory
 14 '-hwaccel', 'cuda', # Use GPU acceleration
 15 '-framerate', '60', # Input frame rate
 16 '-i', os.path.join(frames_renamed_path, 'frame%05d.png'), # Path to input frames
 17 #'-pattern_type', 'glob', '-i', os.path.join(frames_renamed_path, '*.png'), # glob not available in Windows by default
 18 #'-r', '60', # Output frame rate
 19 '-vf', 'pad=ceil(iw/2)*2:ceil(ih/2)*2', # Pad frames to even pixel numbers (required by many codecs)
 20 #'-pix_fmt', 'yuv420p',
 21 '-pix_fmt', 'rgb32', # Use RGB32 pixel format matching MatPlotLib image output
 22 '-filter_complex', # Cut frames into tiles and rearrange (here: 7 horizontal tiles)
 23 'crop=in_w:in_h/7:0:0[tile_1],' # 1st tile from top
 24 + 'crop=in_w:in_h/7:0:in_h*1/7[tile_2],' # 2nd tile from top
 25 + 'crop=in_w:in_h/7:0:in_h*2/7[tile_3],' # 3rd tile from top
 26 + 'crop=in_w:in_h/7:0:in_h*3/7[tile_4],' # 4th tile from top
 27 + 'crop=in_w:in_h/7:0:in_h*4/7[tile_5],' # 5th tile from top
 28 + 'crop=in_w:in_h/7:0:in_h*5/7[tile_6],' # 6th tile from top
 29 + 'crop=in_w:in_h/7:0:in_h*6/7[tile_7],' # 7th tile from top
 30 + '[tile_1][tile_2][tile_3][tile_4][tile_5][tile_6][tile_7]hstack=7', # Stack tiles horizontally
 31 os.path.join(frames_renamed_path, 'video.mp4') # Path to store output video
 32 ]
 33 )
 35 os.chdir(notebook_directory)

File C:\Program Files\Python38\lib\subprocess.py:364, in check_call(*popenargs, **kwargs)
 362 if cmd is None:
 363 cmd = popenargs[0]
--> 364 raise CalledProcessError(retcode, cmd)
 365 return 0

CalledProcessError: Command '['C:\\Users\\Username\\Desktop\\ffmpeg\\ffmpeg', '-y', '-report', '-hwaccel', 'cuda', '-framerate', '60', '-i', 'C:\\Users\\Username\\Desktop\\renamed\\frame%05d.png', '-vf', 'pad=ceil(iw/2)*2:ceil(ih/2)*2', '-pix_fmt', 'rgb32', '-filter_complex', 'crop=in_w:in_h/7:0:0[tile_1],crop=in_w:in_h/7:0:in_h*1/7[tile_2],crop=in_w:in_h/7:0:in_h*2/7[tile_3],crop=in_w:in_h/7:0:in_h*3/7[tile_4],crop=in_w:in_h/7:0:in_h*4/7[tile_5],crop=in_w:in_h/7:0:in_h*5/7[tile_6],crop=in_w:in_h/7:0:in_h*6/7[tile_7],[tile_1][tile_2][tile_3][tile_4][tile_5][tile_6][tile_7]hstack=7', 'C:\\Users\\Username\\Desktop\\renamed\\video.mp4']' returned non-zero exit status 1.
</cell>

This is the
ffmpeglog output (cropped) :

ffmpeg started on 2022-08-04 at 01:17:19
Report written to "ffmpeg-20220804-011719.log"
Log level: 48
Command line:
"C:\\Users\\Username\\Desktop\\ffmpeg\\ffmpeg" -y -report -hwaccel cuda -framerate 60 -i "C:\\Users\\Username\\Desktop\\renamed\\frame%05d.png" -vf "pad=ceil(iw/2)*2:ceil(ih/2)*2" -pix_fmt rgb32 -filter_complex "crop=in_w:in_h/7:0:0[tile_1],crop=in_w:in_h/7:0:in_h*1/7[tile_2],crop=in_w:in_h/7:0:in_h*2/7[tile_3],crop=in_w:in_h/7:0:in_h*3/7[tile_4],crop=in_w:in_h/7:0:in_h*4/7[tile_5],crop=in_w:in_h/7:0:in_h*5/7[tile_6],crop=in_w:in_h/7:0:in_h*6/7[tile_7],[tile_1][tile_2][tile_3][tile_4][tile_5][tile_6][tile_7]hstack=7" "C:\\Users\\Username\\Desktop\\renamed\\video.mp4"
ffmpeg version 2022-07-14-git-882aac99d2-full_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers
 built with gcc 12.1.0 (Rev2, Built by MSYS2 project)
 configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libshaderc --enable-vulkan --enable-libplacebo --ena libavutil 57. 29.100 / 57. 29.100
 libavcodec 59. 38.100 / 59. 38.100
 libavformat 59. 28.100 / 59. 28.100
 libavdevice 59. 8.100 / 59. 8.100
 libavfilter 8. 45.100 / 8. 45.100
 libswscale 6. 8.100 / 6. 8.100
 libswresample 4. 8.100 / 4. 8.100
 libpostproc 56. 7.100 / 56. 7.100
Splitting the commandline.
Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
Reading option '-hwaccel' ... matched as option 'hwaccel' (use HW accelerated decoding) with argument 'cuda'.
Reading option '-framerate' ... matched as AVOption 'framerate' with argument '60'.
Reading option '-i' ... matched as input url with argument 'C:\Users\Username\Desktop\renamed\frame%05d.png'.
Reading option '-vf' ... matched as option 'vf' (set video filters) with argument 'pad=ceil(iw/2)*2:ceil(ih/2)*2'.
Reading option '-pix_fmt' ... matched as option 'pix_fmt' (set pixel format) with argument 'rgb32'.
Reading option '-filter_complex' ... matched as option 'filter_complex' (create a complex filtergraph) with argument 'crop=in_w:in_h/7:0:0[tile_1],crop=in_w:in_h/7:0:in_h*1/7[tile_2],crop=in_w:in_h/7:0:in_h*2/7[tile_3],crop=in_w:in_h/7:0:in_h*3/7[tile_4],crop=in_w:in_h/7:0:in_h*4/7[tile_5],crop=in_w:in_h/7:0:in_h*5/7[tile_6],crop=in_w:in_h/7:0:in_h*6/7[tile_7],[tile_1][tile_2][tile_3][tile_4][tile_5][tile_6][tile_7]hstack=7'.
Reading option 'C:\Users\Username\Desktop\renamed\video.mp4' ... matched as output url.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option y (overwrite output files) with argument 1.
Applying option report (generate a report) with argument 1.
Applying option filter_complex (create a complex filtergraph) with argument crop=in_w:in_h/7:0:0[tile_1],crop=in_w:in_h/7:0:in_h*1/7[tile_2],crop=in_w:in_h/7:0:in_h*2/7[tile_3],crop=in_w:in_h/7:0:in_h*3/7[tile_4],crop=in_w:in_h/7:0:in_h*4/7[tile_5],crop=in_w:in_h/7:0:in_h*5/7[tile_6],crop=in_w:in_h/7:0:in_h*6/7[tile_7],[tile_1][tile_2][tile_3][tile_4][tile_5][tile_6][tile_7]hstack=7.
Successfully parsed a group of options.
Parsing a group of options: input url C:\Users\Username\Desktop\renamed\frame%05d.png.
Applying option hwaccel (use HW accelerated decoding) with argument cuda.
Successfully parsed a group of options.
Opening an input file: C:\Users\Username\Desktop\renamed\frame%05d.png.
[image2 @ 00000000005db0c0] Opening 'C:\Users\Username\Desktop\renamed\frame00000.png' for reading
[file @ 00000000005f6c00] Setting default whitelist 'file,crypto,data'
[AVIOContext @ 00000000005fed40] Statistics: 28860 bytes read, 0 seeks

<...>

[AVIOContext @ 00000000005fda00] Statistics: 67659 bytes read, 0 seeks
[image2 @ 00000000005db0c0] Probe buffer size limit of 5000000 bytes reached
Input #0, image2, from 'C:\Users\Username\Desktop\renamed\frame%05d.png':
 Duration: 00:00:25.00, start: 0.000000, bitrate: N/A
 Stream #0:0, 80, 1/60: Video: png, rgba(pc), 1200x1857 [SAR 3937:3937 DAR 400:619], 60 fps, 60 tbr, 60 tbn
Successfully opened the file.
[Parsed_crop_0 @ 00000000005fdc40] Setting 'out_w' to value 'in_w'
[Parsed_crop_0 @ 00000000005fdc40] Setting 'out_h' to value 'in_h/7'
[Parsed_crop_0 @ 00000000005fdc40] Setting 'x' to value '0'
[Parsed_crop_0 @ 00000000005fdc40] Setting 'y' to value '0'
[Parsed_crop_1 @ 0000000000607500] Setting 'out_w' to value 'in_w'
[Parsed_crop_1 @ 0000000000607500] Setting 'out_h' to value 'in_h/7'
[Parsed_crop_1 @ 0000000000607500] Setting 'x' to value '0'
[Parsed_crop_1 @ 0000000000607500] Setting 'y' to value 'in_h*1/7'
[Parsed_crop_2 @ 0000000000607880] Setting 'out_w' to value 'in_w'
[Parsed_crop_2 @ 0000000000607880] Setting 'out_h' to value 'in_h/7'
[Parsed_crop_2 @ 0000000000607880] Setting 'x' to value '0'
[Parsed_crop_2 @ 0000000000607880] Setting 'y' to value 'in_h*2/7'
[Parsed_crop_3 @ 0000000000607c00] Setting 'out_w' to value 'in_w'
[Parsed_crop_3 @ 0000000000607c00] Setting 'out_h' to value 'in_h/7'
[Parsed_crop_3 @ 0000000000607c00] Setting 'x' to value '0'
[Parsed_crop_3 @ 0000000000607c00] Setting 'y' to value 'in_h*3/7'
[Parsed_crop_4 @ 00000000005fda00] Setting 'out_w' to value 'in_w'
[Parsed_crop_4 @ 00000000005fda00] Setting 'out_h' to value 'in_h/7'
[Parsed_crop_4 @ 00000000005fda00] Setting 'x' to value '0'
[Parsed_crop_4 @ 00000000005fda00] Setting 'y' to value 'in_h*4/7'
[Parsed_crop_5 @ 0000000002b8f800] Setting 'out_w' to value 'in_w'
[Parsed_crop_5 @ 0000000002b8f800] Setting 'out_h' to value 'in_h/7'
[Parsed_crop_5 @ 0000000002b8f800] Setting 'x' to value '0'
[Parsed_crop_5 @ 0000000002b8f800] Setting 'y' to value 'in_h*5/7'
[Parsed_crop_6 @ 0000000000607d00] Setting 'out_w' to value 'in_w'
[Parsed_crop_6 @ 0000000000607d00] Setting 'out_h' to value 'in_h/7'
[Parsed_crop_6 @ 0000000000607d00] Setting 'x' to value '0'
[Parsed_crop_6 @ 0000000000607d00] Setting 'y' to value 'in_h*6/7'
[Parsed_hstack_7 @ 0000000002b8fb80] Setting 'inputs' to value '7'
Cannot find a matching stream for unlabeled input pad 0 on filter Parsed_crop_1


What is the problem here ? Also, how does one interpret this cryptic error message at the end of the log output :


Cannot find a matching stream for unlabeled input pad 0 on filter Parsed_crop_1

E.g. what is
input pad 0, why is itunlabeled, and why can't it find a matching stream ?

(PS. : Yes, I do have a habit of excessively documenting my code. ^^)


-
building c++ code into a shared library
11 avril 2016, par gauravI have some c++ code which i use as shared library in a java application.My c++ code uses some libraries like ffmpeg and boost. and ffmpeg libraries in turn depend on libx264. my first question is - can i build my c++ into a "fat" shared library which contains all the symbols from all libraries used so that on a new machine if i just copy the fat .so file everything works.
If thats not possible then can you help me fix my current build process. This is what i am doing currently -1)on a local VM(ubuntu 64) i compile ffmpeg code using -fPIC flag and install h264 and boost using apt-get commands.
2) on the same VM i compile my code using make file which looks like this-INCLUDES = -I/opt/ffmpeg/include -I/usr/lib/jvm/java-7-openjdk- amd64/include -I/usr/lib/jvm/java-7-openjdk-amd64/include/linux
LDFLAGS = -L/home/ubuntu/ffmpeg_shared
LIBRARIES = -lavformat -lavcodec -lswscale -lavutil -lpthread -lx264 -lboost_system -lboost_thread -lboost_chrono
CC = g++ -std=c++11 -fPIC
all:clean final
final:Api.o ImageSequence.o OverlayAnimation.o Utils.o ImageFrame.o
$(CC) -o final.so Api.o ImageSequence.o OverlayAnimation.o Utils.o ImageFrame.o $(LDFLAGS) $(LIBRARIES) -shared3) on a new machine where java app will run. i install h264 and boost using apt-get commands and copy ffmpeg’s compiled library files to /usr/local/lib.
4) copy the final.so file to this new machine. but when the java code tries to use the final.so file i see it tries to use wierdly named files. for example - it tries to find libavcodec.so.57 , libavformat.so.57 etc. to fix this i just created a copy of these files ie libavcodec.so copied to libavcodec.so.57.
5)But these ffmpeg libraries in turn uses a differently named lib264.so file. on my new machine the apt-get command for x264 installed a file named libx264.so.148 but one of ffmpeg libraries is searching for file libx264.so.142 even if i rename this libx264.so file i get new errors where ffmpeg libraries tries to call libx264’s methods which has these numbers attached.
6) at this time the only working option for me is to bring the c++ code on every new machine and build final.so file locally. this is something i want to avoid since i want to distribute the .so file along with jar file to my clients which they can easily use without having to build and install stuff.
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