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Rennes Emotion Map 2010-11
19 octobre 2011, par
Mis à jour : Juillet 2013
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Increased File Size When Converting MP4 to WebM using FFmpeg
23 décembre 2024, par kimgijeongI am using FFmpeg to convert MP4 to WebM with the following command :


ffmpeg -y -hide_banner -nostats \
-f mov,mp4,m4a,3gp,3g2,mj2 -i "http://127.0.0.1:80/lotteon-low-bitrate.mp4" \
-threads auto -f webm -acodec libopus -b:a 96.059k -vcodec libsvtav1 -preset 11 -pix_fmt yuv420p \
-vf "scale='min(-1, iw)':'min(-1,ih)':force_original_aspect_ratio=decrease,crop=trunc(iw/2)*2:trunc(ih/2)*2" \
"/usr/local/m2/m2temp/xcdrtmp/2052_1.webm"



However, the output webm file size is larger than the source MP4 file. For example :


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Source MP4 : 4.6 MB (bit rate : 994,053 bps)


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Output WebM : 16 MB (bit rate : 3,902,037 bps)








I know SVT-AV1 encoder defaults to CRF mode. Due to not specifying the bitrate explicitly, the SVT-AV1 encoder automatically sets the bit_rate. It appears that the encoder is setting it to a much higher value (3,323,104 bps), causing the increase in file size compared to the source MP4 (994,053 bps). Here are the methods i tried to reduce the WebM file size compared to the source MP4 :


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-b:v 994k




I tried to match the target bitrate with the source MP4's bitrate to reduce the output size, but encountered the following error :


Svt[error]: Instance 1: Force key frames is not supported for VBR mode Last message r
epeated 2 times [libsvtav1 @ 0x239dd100] Error setting encoder parameters: bad parameter (0x80001005)



Looking at the official documentation, this mode change (from CRF to VBR when setting a target bitrate) appears to be expected behavior. However, the error is puzzling since I haven't set any force keyframe parameters in the FFmpeg command.


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svtav1-params "mbr=994k"




The second method i tried was using the
svtav1-params "mbr=994k"
option to set the maxrate while maintaining CRF mode This method showed some improvement, but the output file size was still larger than the source MP4.

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- Output WebM : 5MB (bit rate : 1,209,877 bps)




The more critical reason why we can't adopt the second method (using
svtav1-params "mbr=994k"
) is that even for the same MP4 source file, the output file size varies slightly with each encoding.

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-b:v 994k -svtav1-params “rc=2:pred-struct=1”
(CBR, low delay)




The final method I tried was setting the target bitrate while using CBR (Constant Bit Rate) and low-delay mode The default value for pred-structure is 2(random access), but I had to use low-delay mode due to the following error :


Svt[error]: CBR Rate control is currently not supported for SVT_AV1_PRED_RANDOM_ACCESS, use VBR mode



This way was the only approach among those i tried that successfully reduced the output size.


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- Output WebM : 4.3MB (bit rate : 1,032,373 bps)




In summary, I have three questions about this MP4 to WebM conversion issue :


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-
When setting the target bitrate with -b:v 994k, the switch to VBR mode is expected behavior. However, why does the force keyframe error occur when we haven't explicitly set any force keyframe parameters ?


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Why does the output WebM file size fluctuate when setting maxrate either through -maxrate or svtav1-params "mbr=994k", even when using the same MP4 source file ?


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Besides using -b:v 994k -svtav1-params "rc=2:pred-struct=1" (CBR with low delay), are there any other methods that can guarantee a WebM output size smaller than the source MP4 when converting from MP4 to WebM ?










I am using a recent version of the SVT-AV1 codec :


Svt[info]: SVT [version]: SVT-AV1 Encoder Lib 58146ca
Svt[info]: SVT [build] : GCC 11.5.0 20240719 (Red Hat 11.5.0-2) 64 bit
Svt[info]: LIB Build date: Oct 28 2024 07:40:59
ffmpeg video svt-av1



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I have an MJPEG file decoded with the Intel® IPP JPEG encoder [8.1.42291], how can I convert it to MP4 using ffmpeg ? [closed]
8 mars 2024, par Renan AragãoWhen trying to convert the MJPEG file with ffmpeg, it gives the following error : Output file #0 does not contain any stream.


This is the complete output :


.\ffmpeg.exe -init_hw_device qsv=intel,child_device=1 -filter_hw_device intel -i .\19a57e41-244c-45a4-af41-5069dd3cbe4a.tmp -an -vf "format=nv12,hwupload=extra_hw_frames=20" -c:v h264_qsv record.mp4 -y -loglevel verbose
ffmpeg version n5.0.1-5-g240d82f26e-20220613 Copyright (c) 2000-2022 the FFmpeg developers
 built with gcc 11.2.0 (crosstool-NG 1.24.0.533_681aaef)
 configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-version3 --disable-debug --disable-w32threads --enable-pthreads --enable-iconv --enable-libxml2 --enable-zlib --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libvorbis --enable-opencl --disable-libpulse --enable-libvmaf --disable-libxcb --disable-xlib --enable-amf --enable-libaom --enable-libaribb24 --disable-avisynth --enable-libdav1d --disable-libdavs2 --disable-libfdk-aac --enable-ffnvcodec --enable-cuda-llvm --disable-frei0r --enable-libgme --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librist --enable-libtheora --enable-libvpx --enable-libwebp --enable-lv2 --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --enable-librav1e --disable-librubberband --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libsvtav1 --enable-libtwolame --enable-libuavs3d --disable-libdrm --disable-vaapi --disable-libvidstab --enable-vulkan --enable-libshaderc --enable-libplacebo --disable-libx264 --disable-libx265 --disable-libxavs2 --disable-libxvid --enable-libzimg --enable-libzvbi --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-ldflags=-pthread --extra-ldexeflags= --extra-libs=-lgomp --extra-version=20220613
 libavutil 57. 17.100 / 57. 17.100
 libavcodec 59. 18.100 / 59. 18.100
 libavformat 59. 16.100 / 59. 16.100
 libavdevice 59. 4.100 / 59. 4.100
 libavfilter 8. 24.100 / 8. 24.100
 libswscale 6. 4.100 / 6. 4.100
 libswresample 4. 3.100 / 4. 3.100
WARNING: defaulting child_device_type to AV_HWDEVICE_TYPE_DXVA2 for compatibility with old commandlines. This behaviour will be removed in the future. Please explicitly set device type via "-init_hw_device" option.
[AVHWDeviceContext @ 000001953dac2f40] Using D3D9Ex device.
[AVHWDeviceContext @ 000001953dac2a80] Initialize MFX session: API version is 1.35, implementation version is 1.35
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '.\19a57e41-244c-45a4-af41-5069dd3cbe4a.tmp':
 Metadata:
 major_brand : mp42
 minor_version : 0
 compatible_brands: mp42isom
 creation_time : 2024-03-06T13:32:38.000000Z
 Duration: 00:00:00.00, bitrate: N/A
Output #0, mp4, to 'record.mp4':
Output file #0 does not contain any stream



I try using ipp in python and dotnet, but idon't found sample code. I need convert MJPEG Intel IPP to mp4.