[FFmpeg-trac] #9719(undetermined:new): FFmpeg HLS output with subtitles results in segmentation fault starting from 5.x
FFmpeg
trac at avcodec.org
Fri Aug 16 10:21:00 EEST 2024
#9719: FFmpeg HLS output with subtitles results in segmentation fault starting
from 5.x
-------------------------------------+-------------------------------------
Reporter: wout | Owner: (none)
Type: defect | Status: new
Priority: normal | Component:
| undetermined
Version: git-master | Resolution:
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Comment (by wout):
The following command triggers the segmentation fault.
You can use any input MP4 with 1 video and 1 audio + empty files for the
VTT's.
The video track is mapped multiple times because we cannot define multiple
subtitles in the `var_stream_map` without a video.
The commit mentioned in the original report causes a segmentation fault
because of this. Reverting it produces a correct HLS.
The audio track is mapped multiple times just to simulate multiple audio
languages.
`ffmpeg -i input.mp4 -i en.vtt -i nl.vtt -c copy -map 0:v:0 -map 0:v:0
-map 0:v:0 -map 0:a:0 -map 0:a:0 -map 1:s:0 -map 2:s:0 -f hls
-var_stream_map "a:0,name:en_audio,agroup:audio,language:en,default:YES
a:1,name:nl_audio,agroup:audio,language:nl,default:NO
v:0,name:en,s:0,sgroup:subtitle,language:en,default:NO
v:1,name:nl,s:1,sgroup:subtitle,language:nl,default:NO
v:2,name:high,agroup:audio" "%v.m3u8"`
Output:
{{{
ffmpeg version 7.0.1 Copyright (c) 2000-2024 the FFmpeg developers
built with gcc 12 (Debian 12.2.0-14)
configuration: --prefix=/usr/local --toolchain=hardened --enable-gpl
--enable-version3 --enable-nonfree --enable-postproc --enable-avfilter
--enable-libfontconfig --enable-libfreetype --enable-pthreads --enable-
libopenjpeg --enable-gmp --enable-openssl --enable-libx264 --enable-
libx265 --enable-libzmq --enable-libsrt --enable-libnpp --enable-cuda
--enable-cuda-nvcc --enable-cuvid --enable-nvenc --enable-
filter=scale_cuda --enable-filter=hwupload_cuda --enable-filter=hwdownload
--enable-filter=thumbnail_cuda --extra-cflags=-I/usr/local/cuda/include
--extra-ldflags=-L/usr/local/cuda/lib64
libavutil 59. 8.100 / 59. 8.100
libavcodec 61. 3.100 / 61. 3.100
libavformat 61. 1.100 / 61. 1.100
libavdevice 61. 1.100 / 61. 1.100
libavfilter 10. 1.100 / 10. 1.100
libswscale 8. 1.100 / 8. 1.100
libswresample 5. 1.100 / 5. 1.100
libpostproc 58. 1.100 / 58. 1.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.45.100
Duration: 00:03:47.46, start: 0.000000, bitrate: 2513 kb/s
Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661),
yuv420p(tv, bt709, progressive), 1458x1080 [SAR 1:1 DAR 27:20], 2380 kb/s,
23.98 fps, 23.98 tbr, 24k tbn (default)
Metadata:
handler_name : ISO Media file produced by Google Inc.
vendor_id : [0][0][0][0]
Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz,
stereo, fltp, 127 kb/s (default)
Metadata:
handler_name : ISO Media file produced by Google Inc.
vendor_id : [0][0][0][0]
Input #1, webvtt, from 'en.vtt':
Duration: N/A, bitrate: N/A
Stream #1:0: Subtitle: webvtt
Input #2, webvtt, from 'nl.vtt':
Duration: N/A, bitrate: N/A
Stream #2:0: Subtitle: webvtt
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:0 -> #0:1 (copy)
Stream #0:0 -> #0:2 (copy)
Stream #0:1 -> #0:3 (copy)
Stream #0:1 -> #0:4 (copy)
Stream #1:0 -> #0:5 (copy)
Stream #2:0 -> #0:6 (copy)
[mpegts @ 0x5650f6143b80] frame size not set
[mpegts @ 0x5650f614fac0] frame size not set
[hls @ 0x5650f611c140] Opening 'en0.vtt' for writing
[hls @ 0x5650f611c140] Opening 'nl0.vtt' for writing
Output #0, hls, to '%v.m3u8':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf61.1.100
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv,
bt709, progressive), 1458x1080 [SAR 1:1 DAR 27:20], q=2-31, 2380 kb/s,
23.98 fps, 23.98 tbr, 90k tbn (default)
Metadata:
handler_name : ISO Media file produced by Google Inc.
vendor_id : [0][0][0][0]
Stream #0:1(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv,
bt709, progressive), 1458x1080 [SAR 1:1 DAR 27:20], q=2-31, 2380 kb/s,
23.98 fps, 23.98 tbr, 90k tbn (default)
Metadata:
handler_name : ISO Media file produced by Google Inc.
vendor_id : [0][0][0][0]
Stream #0:2(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv,
bt709, progressive), 1458x1080 [SAR 1:1 DAR 27:20], q=2-31, 2380 kb/s,
23.98 fps, 23.98 tbr, 90k tbn (default)
Metadata:
handler_name : ISO Media file produced by Google Inc.
vendor_id : [0][0][0][0]
Stream #0:3(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo,
fltp, 127 kb/s (default)
Metadata:
handler_name : ISO Media file produced by Google Inc.
vendor_id : [0][0][0][0]
Stream #0:4(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo,
fltp, 127 kb/s (default)
Metadata:
handler_name : ISO Media file produced by Google Inc.
vendor_id : [0][0][0][0]
Stream #0:5: Subtitle: webvtt (default)
Stream #0:6: Subtitle: webvtt
Press [q] to stop, [?] for help
Segmentation fault
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/9719#comment:7>
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