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• Converting HLS video with fmp4 segments to image thumbnails via ffmpeg with start offset using fast seek

  19 octobre 2022, par hellerahum

  I'm having trouble with what I think should be a basic use case for ffmpeg. What I'd like to do is take an hls video in fmp4 and output 30s of images at 10fps, using "fast seek" to start at an offset well into the video. This works with an Apple sample using ts segments, but not with fmp4 segments.

  


  working sample (ts)

  


  ffmpeg -ss 00:00:05 -i https://devimages.apple.com.edgekey.net/iphone/samples/bipbop/bipbopall.m3u8 -t 30 -vf fps=10 hls_samples/img%03d.jpg


  


  broken sample (fmp4)

  


  ffmpeg -ss 00:00:05 -i https://devstreaming-cdn.apple.com/videos/streaming/examples/img_bipbop_adv_example_fmp4/master.m3u8 -t 30 -vf fps=10 hls_samples/img%03d.jpg


  


  The broken sample spits out errors like :

  


  [NULL @ 0x123e30d20] Invalid NAL unit size (-2003396084 > 1673).
[NULL @ 0x123e30d20] missing picture in access unit with size 1677


  


  and then finally :

  


  Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)
Conversion failed!


  


  When I re-encode the fmp4 video adding keyframes via -g 1 (still hls with fmp4) I'm then able to use the fast seek -ss flag before the -i , but i'd rather not do this in a 2-step process, and ideally would take the original hls/fmp4 manifest and output the thumbnails directly. Both samples work with the -ss flag after the input (slow seek) but I have some long (10+ hour) videos so that's not tenable. Anyone able to point me to what I'm doing wrong, or is it possible this is an issue with ffmpeg and its support for fmp4 ? I'm using ffmpeg v5.1.2 and have checked on both an M1 mac and Ubuntu system.

  


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

  29 novembre 2021, par louxiu
  

  1. 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


  


  


  2. x264 version x264-snapshot-20191217-2245

     


  


  3. configure

     


  


  


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


  


  

  4. 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.


  


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

  29 novembre 2021, par louxiu
  

  1. 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


  


  


  2. x264 version x264-snapshot-20191217-2245

     


  


  3. configure

     


  


  


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


  


  

  4. 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.