May 2025 - FFmpeg-trac - lists.ffmpeg.org

#11217(ffmpeg:new): -ss causing a substantial memory increase
by FFmpeg 19 Jul '25

19 Jul '25

#11217: -ss causing a substantial memory increase -------------------------------------+------------------------------------- Reporter: Bryce | Type: defect Chester Newman | Status: new | Priority: important Component: ffmpeg | Version: 7.1 Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Summary of the bug: There appears to be a behavior change or bug introduced between FFmpeg 6.1 and 7.0/7.1 when using the “-ss” argument that is causing a substantial memory increase. Running the command below using FFmpeg 6.1 memory usage is about 500MB – which is expected. Running the command below using FFmpeg 7.0/7.1 memory usage is about 3GB – which is not expected. If I remove the “-ss” argument when running on FFmepg 7.0 or 7.1 the memory footprint is the same as 6.1. I can reproduce this on Linux(Ubuntu) and Apple M2. I can reproduce the memory increase using .mxf, mov and .mp4 as an input file. How to reproduce: {{{ ffmpeg -report -v 9 -loglevel 99 -y -i 1951279840.mov \ -filter_complex "[0:v:0]scale='768:432':force_original_aspect_ratio=decrease:force_divisible_by=2[jpg-600];[0:v:0]scale='1280:640'[mp4-640]" \ -map "[jpg-600]" -ss 67 -f image2 -q:v 5 -update 1 -frames:v 1 /tmp/jpg-600-123456.jpg \ -map "[mp4-640]" -map_metadata -1 -f mp4 -vcodec libx264 -profile:v main -level 3.1 -crf 23 -b:v 2500K -movflags faststart -refs 4 -pix_fmt yuv420p -color_primaries bt709 -color_trc bt709 -colorspace bt709 -preset medium /tmp/mp4-640-23456.mp4 }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/11217> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

1 36

#11418(undetermined:new): stack-buffer-overflow on libavcodec/aacenc_tns.c
by FFmpeg 15 Jul '25

15 Jul '25

#11418: stack-buffer-overflow on libavcodec/aacenc_tns.c -------------------------------------+------------------------------------- Reporter: 0x20z | Type: defect Status: new | Priority: important Component: | Version: git- undetermined | master Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Summary of the bug: {{{ I have discovered a stack-buffer-overflow vulnerability. The POC file is attached to the session, and the version of ffmpeg is the main branch. Please confirm. }}} How to reproduce: {{{ git clone https://github.com/FFmpeg/FFmpeg.git cd FFmpeg ./configure --cc=clang --cxx=clang++ --toolchain=clang-asan --extra- cflags="-I$HOME/ffmpeg_build/include -O0 -fno-omit-frame-pointer -g" --extra-cxxflags="-O0 -fno-omit-frame-pointer -g" --extra- ldflags="-L$HOME/ffmpeg_build/include -fsanitize=address -fsanitize=undefined -lubsan" --disable-optimizations --disable-stripping --enable-cross-compile make -j30 ./ffmpeg -i poc -aac_pred true -profile:a aac_low output.mpd }}} log： {{{ ================================================================= ==1108156==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7f286b5fe998 at pc 0x572aadc11f35 bp 0x7f286b5fe8e0 sp 0x7f286b5fe8d0 READ of size 4 at 0x7f286b5fe998 thread T1 (enc0:0:aac) #0 0x572aadc11f34 in ff_aac_search_for_tns libavcodec/aacenc_tns.c:204 #1 0x572aacede67e in aac_encode_frame libavcodec/aacenc.c:1020 #2 0x572aaaa197e2 in ff_encode_encode_cb libavcodec/encode.c:254 #3 0x572aaaa1b896 in encode_simple_internal libavcodec/encode.c:340 #4 0x572aaaa1bbfb in encode_simple_receive_packet libavcodec/encode.c:354 #5 0x572aaaa1cb13 in encode_receive_packet_internal libavcodec/encode.c:388 #6 0x572aaaa1e97e in avcodec_send_frame libavcodec/encode.c:531 #7 0x572aa7edbe65 in encode_frame fftools/ffmpeg_enc.c:643 #8 0x572aa7edf861 in frame_encode fftools/ffmpeg_enc.c:812 #9 0x572aa7ee0a09 in encoder_thread fftools/ffmpeg_enc.c:899 #10 0x572aa7fb17b2 in task_wrapper fftools/ffmpeg_sched.c:2534 #11 0x7f286f094ac2 in start_thread nptl/pthread_create.c:442 #12 0x7f286f12684f (/usr/lib/x86_64-linux-gnu/libc.so.6+0x12684f) Address 0x7f286b5fe998 is located in stack of thread T1 (enc0:0:aac) at offset 40 in frame #0 0x572aadc1038a in ff_aac_search_for_tns libavcodec/aacenc_tns.c:162 This frame has 2 object(s): [32, 40) 'en' (line 183) <== Memory access at offset 40 overflows this variable [64, 320) 'coefs' (line 165) HINT: this may be a false positive if your program uses some custom stack unwind mechanism, swapcontext or vfork (longjmp and C++ exceptions *are* supported) Thread T1 (enc0:0:aac) created by T0 here: #0 0x7f286fc58685 in __interceptor_pthread_create ../../../../src/libsanitizer/asan/asan_interceptors.cpp:216 #1 0x572aa7f8ad4b in task_start fftools/ffmpeg_sched.c:414 #2 0x572aa7fa09d7 in sch_start fftools/ffmpeg_sched.c:1615 #3 0x572aa8006dea in transcode fftools/ffmpeg.c:864 #4 0x572aa80081a8 in main fftools/ffmpeg.c:992 #5 0x7f286f029d8f in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58 SUMMARY: AddressSanitizer: stack-buffer-overflow libavcodec/aacenc_tns.c:204 in ff_aac_search_for_tns }}} Found by： {{{ 0x20z }}} Thank you for your time and attention -- Ticket URL: <https://trac.ffmpeg.org/ticket/11418> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

1 6

#5970(undetermined:new): No valid multicast port obtained from RTSP
by FFmpeg 11 Jul '25

11 Jul '25

#5970: No valid multicast port obtained from RTSP -------------------------------------+------------------------------------- Reporter: ioeir2 | Type: defect Status: new | Priority: normal Component: | Version: undetermined | unspecified Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Summary of the bug: Cannot get multicast RTSP stream from camera via ffmpeg/ffplay. ffmpeg/ffplay tries to connect to UDP port 0 instead of 40000. It sends in SETUP: Transport: RTP/AVP/UDP;multicast But should something like Transport: RTP/AVP;multicast;destination=224.1.2.4;port=40000-40001 How to reproduce: IP camera: Amcrest IPM-HX1, sw. version 2.420.AC00.15.R, build : 2016-09-08. Very popular at the moment IP camera. {{{ ./ffplay-3.2 -rtsp_transport udp_multicast 'rtsp://admin:password@10.0.1.20/cam/realmonitor?channel=1&subtype=0&proto=Dahua3&unicast=false' ffplay version 3.2 Copyright (c) 2003-2016 the FFmpeg developers built with Apple LLVM version 8.0.0 (clang-800.0.42.1) configuration: libavutil 55. 34.100 / 55. 34.100 libavcodec 57. 64.100 / 57. 64.100 libavformat 57. 56.100 / 57. 56.100 libavdevice 57. 1.100 / 57. 1.100 libavfilter 6. 65.100 / 6. 65.100 libswscale 4. 2.100 / 4. 2.100 libswresample 2. 3.100 / 2. 3.100 [udp @ 0x7fb20bc9d500] bind failed: Permission denied 0B f=0/0 [udp @ 0x7fb20bc9b1a0] bind failed: Permission denied [udp @ 0x7fb20bc9b220] bind failed: Permission denied Segmentation fault: 11 }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/5970> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#11169(avformat:new): Linking VapourSynth suddenly fails in MSYS2/MinGW64/GCC 14.2
by FFmpeg 11 Jul '25

11 Jul '25

#11169: Linking VapourSynth suddenly fails in MSYS2/MinGW64/GCC 14.2 ----------------------------------+-------------------------------------- Reporter: LigH | Type: defect Status: new | Priority: normal Component: avformat | Version: git-master Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | ----------------------------------+-------------------------------------- Summary of the bug: Compiling ffmpeg including VapourSynth, specifically linking the "alternative vapoursynth demuxer", worked last week, fails now. [https://github.com/m-ab-s/media-autobuild_suite/issues/2766 M-AB-S issue 2766] [https://github.com/user-attachments/files/16824998/logs.zip logs.zip] collected by M-AB-S How to reproduce: {{{ CPPFLAGS: CFLAGS: -D_FORTIFY_SOURCE=2 -fstack-protector-strong -mtune=generic -O2 -pipe -D__USE_MINGW_ANSI_STDIO=1 -mthreads CXXFLAGS: -D_FORTIFY_SOURCE=2 -fstack-protector-strong -mtune=generic -O2 -pipe -D__USE_MINGW_ANSI_STDIO=1 LDFLAGS: -D_FORTIFY_SOURCE=2 -fstack-protector-strong -mtune=generic -O2 -pipe -D__USE_MINGW_ANSI_STDIO=1 -static-libgcc -static-libstdc++ make -j4 {...} LD ffmpeg_g.exe LD ffplay_g.exe LD ffprobe_g.exe G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x2f): undefined reference to `__imp_vsscript_freeScript' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x35): undefined reference to `__imp_vsscript_finalize' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x56): undefined reference to `__imp_vsscript_init' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x7e): undefined reference to `__imp_vsscript_getApiVersion' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0xb4): undefined reference to `__imp_vsscript_getVSApi2' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0xf1): undefined reference to `__imp_vsscript_evaluateFile' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x121): undefined reference to `__imp_vsscript_getOutput' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x2f): undefined reference to `__imp_vsscript_freeScript' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x552): undefined reference to `__imp_vsscript_freeScript' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x35): undefined reference to `__imp_vsscript_finalize' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x55f): undefined reference to `__imp_vsscript_finalize' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x56): undefined reference to `__imp_vsscript_init' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x7e): undefined reference to `__imp_vsscript_getApiVersion' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0xb4): undefined reference to `__imp_vsscript_getVSApi2' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0xf1): undefined reference to `__imp_vsscript_evaluateFile' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x121): undefined reference to `__imp_vsscript_getOutput' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x552): undefined reference to `__imp_vsscript_freeScript' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x55f): undefined reference to `__imp_vsscript_finalize' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x2f): undefined reference to `__imp_vsscript_freeScript' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x35): undefined reference to `__imp_vsscript_finalize' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x56): undefined reference to `__imp_vsscript_init' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x7e): undefined reference to `__imp_vsscript_getApiVersion' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0xb4): undefined reference to `__imp_vsscript_getVSApi2' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0xf1): undefined reference to `__imp_vsscript_evaluateFile' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x121): undefined reference to `__imp_vsscript_getOutput' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x552): undefined reference to `__imp_vsscript_freeScript' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x55f): undefined reference to `__imp_vsscript_finalize' collect2.exe: error: ld returned 1 exit status collect2.exe: error: ld returned 1 exit status make: *** [/build/ffmpeg-git/Makefile:141: ffprobe_g.exe] Error 1 make: *** Waiting for unfinished jobs.... make: *** [/build/ffmpeg-git/Makefile:141: ffplay_g.exe] Error 1 collect2.exe: error: ld returned 1 exit status make: *** [/build/ffmpeg-git/Makefile:141: ffmpeg_g.exe] Error 1 LD ffmpeg_g.exe G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x2f): undefined reference to `__imp_vsscript_freeScript' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x35): undefined reference to `__imp_vsscript_finalize' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x56): undefined reference to `__imp_vsscript_init' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x7e): undefined reference to `__imp_vsscript_getApiVersion' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0xb4): undefined reference to `__imp_vsscript_getVSApi2' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0xf1): undefined reference to `__imp_vsscript_evaluateFile' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x121): undefined reference to `__imp_vsscript_getOutput' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x552): undefined reference to `__imp_vsscript_freeScript' G:/MABS/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: libavformat/libavformat.a(vapoursynth_alt.o):vapoursynth_al:(.text.unlikely+0x55f): undefined reference to `__imp_vsscript_finalize' collect2.exe: error: ld returned 1 exit status make: *** [/build/ffmpeg-git/Makefile:141: ffmpeg_g.exe] Error 1 }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/11169> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

1 1

#9846(ffmpeg:new): DNxHR doesn't work with LB in Shutter Encoder
by FFmpeg 10 Jul '25

10 Jul '25

#9846: DNxHR doesn't work with LB in Shutter Encoder -------------------------------------+------------------------------------- Reporter: Soto Soto | Type: defect Status: new | Priority: normal Component: ffmpeg | Version: Keywords: ffmpeg | unspecified dnxhr | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- '''Summary of the bug:''' I've just been forwarded by the creator of Shutter Encoder who uses FFmpeg as the backend of their software. I wanted to create a small 480x270 file at low bitrate and the render stops after a few minutes. The last line the console says is "Assertion s->buf_ptr < s->buf_end failed at src/libavcodec/put_bits.h:150". How to reproduce: 1. Used a 1920x1080p, 60fps, h.264 10gb file. 2. Dropped it in Shutter Encoder, set to DNxHR > LB ("Low Bitrate" doesn't state the number of the bitrate itself). Change scale to 480x270p 3. Render 4. Error shown in the last line of the console (right click in progress bar and click "Console"). -- Ticket URL: <https://trac.ffmpeg.org/ticket/9846> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

1 9

#10732(undetermined:new): avcodec_flush_buffers() not resetting E-AC-3 decoder
by FFmpeg 08 Jul '25

08 Jul '25

#10732: avcodec_flush_buffers() not resetting E-AC-3 decoder ----------------------------------------+---------------------------------- Reporter: Peter Krefting | Type: defect Status: new | Priority: minor Component: undetermined | Version: 5.0.3 Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | ----------------------------------------+---------------------------------- Summary of the bug: I am reusing the same AVCodecContext to decode several parallel E-AC-3 audio streams. As per documentation I am calling [https://ffmpeg.org/doxygen/trunk/group__lavc__misc.html#gaf60b0e076f822abcb… avcodec_flush_buffers()] between each decoding run. This seems to work for most codecs, but when used with the E-AC-3 decoder the output is not identical between runs How to reproduce: {{{#!c #include <libavcodec/avcodec.h> #include <libavformat/avformat.h> #include <stdio.h> #include <assert.h> int main(int argc, char *argv[]) { const AVCodec *codec = avcodec_find_decoder(AV_CODEC_ID_EAC3); AVCodecContext *decoder = avcodec_alloc_context3(codec); avcodec_open2(decoder, codec, NULL); assert(decoder->sample_fmt == AV_SAMPLE_FMT_FLTP); for (int l = 0; l < 2; ++ l) { printf("[%d] Reading file\n", l); avcodec_flush_buffers(decoder); AVFormatContext *avf_ctx = NULL; avformat_open_input(&avf_ctx, "file:i28553p303t610156395819694.ac3", NULL, NULL); avformat_find_stream_info(avf_ctx, NULL); AVPacket avpkt = { 0 }; while (av_read_frame(avf_ctx, &avpkt) == 0) { avcodec_send_packet(decoder, &avpkt); AVFrame *frame = av_frame_alloc(); avcodec_receive_frame(decoder, frame); printf("Got %d samples in %d channels\n", frame->nb_samples, frame->channels); for (int i = 0; i < frame->nb_samples; ++ i) { printf("%4d:", i); for (int j = 0; j < frame->channels; ++ j) { printf(" [%d]%f", j, ((float *) frame->data[j])[i]); } printf("\n"); } av_frame_free(&frame); } avformat_close_input(&avf_ctx); } avcodec_free_context(&decoder); return 0; } }}} The test file is available here: https://e.pcloud.link/publink/show?code=XZS8y1ZlEryJIDYU0yIzDTUhw1sDfHDRtUV and contains a ten-second extract of an audio track from an MPEGTS container, captured off-air while looking at a problem where the encoder suddenly only outputs silence. I expect the output to be identical on the first and second run, but that is not what I am seeing: {{{ $ ./decode |grep -A5 'Reading file' [eac3 @ 0x55fc4b0a5ec0] Estimating duration from bitrate, this may be inaccurate [0] Reading file Got 1536 samples in 6 channels 0: [0]0.000000 [1]0.000000 [2]0.000000 [3]0.000000 [4]0.000000 [5]0.000000 1: [0]0.000000 [1]0.000000 [2]0.000000 [3]0.000000 [4]0.000000 [5]0.000000 2: [0]0.000000 [1]0.000000 [2]0.000000 [3]0.000000 [4]0.000000 [5]0.000000 3: [0]0.000000 [1]0.000000 [2]0.000000 [3]0.000000 [4]0.000000 [5]0.000000 [eac3 @ 0x55fc4b11a840] Estimating duration from bitrate, this may be inaccurate -- [1] Reading file Got 1536 samples in 6 channels 0: [0]0.000000 [1]0.000000 [2]0.000000 [3]0.000000 [4]0.000000 [5]0.000000 1: [0]-0.000000 [1]0.000000 [2]-0.000000 [3]-0.000000 [4]-0.000000 [5]-0.000000 2: [0]0.000000 [1]0.000000 [2]0.000000 [3]0.000000 [4]0.000000 [5]0.000000 3: [0]-0.000000 [1]-0.000000 [2]-0.000000 [3]-0.000000 [4]-0.000000 [5]-0.000000 }}} In real life we are also interleaving other E-AC-3 audio streams from the same MPEGTS between decodes, and see that the initial decoded samples differ even more than when just redecoding the same sample over and over. -- Ticket URL: <https://trac.ffmpeg.org/ticket/10732> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#11597(avfilter:new): FFmpeg output is stuck if using split with fps filter
by FFmpeg 06 Jul '25

06 Jul '25

#11597: FFmpeg output is stuck if using split with fps filter -------------------------------------+------------------------------------- Reporter: TheTroll | Type: defect Status: new | Priority: important Component: avfilter | Version: git- Keywords: split | master thumbnail | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Summary of the bug: How to reproduce: {{{ % ffmpeg -re -y -i INPUT -filter_complex "[0:v]split=2[s0][sthumb];[s0]scale=320:184[o0];[sthumb]fps=1/60[othumb]" -an -c:v libx264 -map [o0] out.ts -map [othumb] -update 1 out.png }}} Built on master When trying to transcode an input live stream while extracting thumbnails (every minute in this example), using the split and fps filters, FFmpeg gets blocked and eventually generates the output after a while, by bursts. The following warning indicates that something is wrong: [out_#0:0 @ 0x7f1018013c00] 100 buffers queued in out_#0:0, something may be wrong. FFmpeg 5.1.2 works fine and as expected. Thanks -- Ticket URL: <https://trac.ffmpeg.org/ticket/11597> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#11366(undetermined:new): Regression when prepending/concatenating still image to video
by FFmpeg 06 Jul '25

06 Jul '25

#11366: Regression when prepending/concatenating still image to video -------------------------------------+------------------------------------- Reporter: mahozad | Type: defect Status: new | Priority: normal Component: | Version: 7.1 undetermined | Keywords: concat | Blocked By: concatenate filter_complex | Blocking: | Reproduced by developer: 1 Analyzed by developer: 0 | -------------------------------------+------------------------------------- **Summary of the bug:** I'm using FFmpeg to create clips with ability to concat an image to be shown at the start of the clip for the specified duration: https://github.com/mahozad/cutcon It uses FFmpeg CLI. FFmpeg version 6.1.1 (and I think also version 5.1.2) worked as expected. When upgrading to FFmpeg 7.1, the result video just contains the intro image and then just ends. I'm not sure if this is a regression. Maybe my FFmpeg command is "wrong" and it should have failed in previous versions as well? **How to reproduce:** FFmpeg 7.1 and also FFmpeg-full 2024-12-19-git-494c961379 downloaded from https://www.gyan.dev/ffmpeg/builds/ both tested on Windows 11. Here is an example FFmpeg invocation (formatted, each option in a new line) to reproduce the problem. It tries to create a clip from an input MP4 file and show an image at the start for 8 seconds. The image size is coerced to be at maximum the size of video and is padded with black color if its aspect ratio is different than the video. There is some other filters too. {{{ path/to/ffmpeg.exe -y -nostdin -loglevel info -stats_period 0.1s -accurate_seek -ss 356500ms -to 378500ms -i path/to/a/video.mp4 -loop 1 -framerate 25 -t 8s -i path/to/a/picture.jpg -t 8s -f lavfi -i aevalsrc=0 -filter_complex [0] yadif=1 [media-de-interlaced]; [media-de-interlaced] scale=iw*sar:ih [media-anamorphic-fixed]; [media-anamorphic-fixed] pad=ceil(iw/2)*2:ceil(ih/2)*2 [media-odd- pixel-number-fixed]; [media-odd-pixel-number-fixed] setsar=1/1 [media-source-aspect- ratio-normalized]; [media-source-aspect-ratio-normalized] null [media]; [1][media] scale2ref='if(gt(main_a,a),min(main_w,iw),min(main_h,ih)*main_a)':'if(gt(main_a,a),min(main_w,iw)/main_a,min(main_h,ih))' [intro-image-max-size-coerced][media]; [1][media] scale2ref=iw:ih [size-template][media]; [size-template] drawbox=w=iw:h=ih:t=fill:color=#000000 [intro- background]; [intro-background][intro-image-max-size-coerced] overlay=x='(W-w)/2':y='(H-h)/2' [intro-with-background]; [intro-with-background] setsar=1/1 [intro-source-aspect-ratio- normalized]; [intro-source-aspect-ratio-normalized] null [intro]; [intro][2][media] concat=n=2:v=1:a=1 -c:v libx264 -c:a aac -crf 23 -r 25 -metadata encoding_tool=Cutcon v1.2.3 path/to/output.mp4 }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/11366> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#10959(undetermined:new): ffmpeg 7.0: Assertion best_input >= 0 failed at fftools/ffmpeg_filter.c:1923
by FFmpeg 06 Jul '25

06 Jul '25

#10959: ffmpeg 7.0: Assertion best_input >= 0 failed at fftools/ffmpeg_filter.c:1923 -------------------------------------+------------------------------------- Reporter: Andreas | Type: defect Status: new | Priority: normal Component: | Version: undetermined | unspecified Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- I try to split a video into 3 parts: {{{ % C:/Java/ffmpeg-n7.0-latest-win64-gpl-7.0/bin/ffmpeg.exe -report -nostdin -y -i video.mp4 -filter_complex "[v:0]select=n='3':e='gte(t,0.00)*lt(t,10.45)*1 + gte(t,10.45)*lt(t,58.50)*2 + gte(t,58.50)*lt(t,3661.00)*3'[vout001][vout002][vout003]" -map [vout001] v00-001.mp4 -map [vout002] v00-002.mp4 -map [vout003] v00-003.mp4 ... [out_0_0 @ 0000021b889bd600] 100 buffers queued in out_0_0, something may be wrong. ... [out_1_0 @ 0000021b889be200] 100 buffers queued in out_1_0, something may be wrong. [out_1_0 @ 0000021b889be200] 1000 buffers queued in out_1_0, something may be wrong. ... Assertion best_input >= 0 failed at fftools/ffmpeg_filter.c:1923 }}} It is independent of the input video, but you can find the video here: https://a-voss.de/ffmpeg/video.mp4 -- Ticket URL: <https://trac.ffmpeg.org/ticket/10959> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#11578(ffmpeg:new): Waveform discontinuity in decoded E-AC-3
by FFmpeg 05 Jul '25

05 Jul '25

#11578: Waveform discontinuity in decoded E-AC-3 --------------------------------+--------------------------------------- Reporter: j7n | Type: defect Status: new | Priority: normal Component: ffmpeg | Version: unspecified Keywords: eac3 | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | --------------------------------+--------------------------------------- Summary of the bug: Specific E-AC-3 streams with Atmos occasionally fade in from zero amplitude at a block boundary, producing a click. It only happens on the first playthrough. Rewinding to before the defect in the same player session makes the fault disappear. Channels higher than 0 in a 5.1 layout are affected. The official Dolby decoder works fine. The streams were acquired from Apple Music. whatifwe.ec3 : glitch at 187136 pourque.ec3 : glitch at 41728 How to reproduce: {{{ % ffmpeg -i pourque.ec3 pourque.wav ffmpeg version n7.1.1-10-gc6c20e04cc-20250507 }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/11578> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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