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• Concatenating Video Files using FFMPEG YUV issue

  3 novembre 2015, par SpoiledTechie.com

  I am concatenating three videos with FFMPEG.

  The 1st and 3rd video of the concatenation were pulled from an AVI file using FFMPEG and converted into MP4.

  Their codec information is below.

  

  The 2nd video in the concatenation is compiled using FFMPEG. I am compiling frames with FFMPEG to create this video.

  Its codec information is below.

  
  As you can see, the videos share the same codec, resolution and frame rate.

  The only thing they don’t share is the Decoded format. One being 4:4:4 and one being 4:2:2

  I think I understand what YUV means from this link, https://msdn.microsoft.com/en-us/library/windows/desktop/dd391027%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396

  When I concatenate these three videos together, using concat demuxer, it works, but when I try to watch the final video, the video shows the first file playing just right, then the 2nd video in the final video shows up BLANK and the third video plays just fine as well.

  So my question is, how do I concat 3 MP4 files, but change what seems to be the decoded format for the 2nd video to 4:2:2. When I compile the frames, I imagine I can change the YUV format, but I don’t know how just yet.

• FFmpeg : MD5 hash of M3U8 playlists generated from same input video with different segment durations (after applying video filter) don't match

  30 juillet 2020, par Saurabh P Bhandari

  Here are a few commands I am using to convert and transize a video in MP4 format to a M3U8 playlist.

  


  For a given input video (MP4 format), generate multiple video segments with segment duration 30 seconds.

  


  ffmpeg -loglevel error -i input.mp4 -dn -sn -an -c:v copy -bsf:v h264_mp4toannexb -copyts -start_at_zero -f segment -segment_time 30 30%03d.mp4 -dn -sn -vn -c:a copy audio.aac


  


  Apply a video filter (in this case scaling) on each segment and convert it to a M3U8 format.

  


  ls 30*.mp4 | parallel 'ffmpeg -loglevel error -i {} -vf scale=-2:144 -hls_list_size 0 {}.m3u8'


  


  Store the list of m3u8 files generated in list.txt in this format file 'segment-name.m3u8'

  


  for f in 30*.m3u8; do echo "file '$f'" >> list.txt; done


  


  Using concat demuxer, combine all segment files (which are in M3U8 format) and the audio to get one final m3u8 playlist pointing to segments with duration of 10 seconds.

  


  ffmpeg -loglevel error -f concat -i list.txt -i audio.aac -c copy -hls_list_size 0 -hls_time 10 output_30.m3u8


  


  ---

  


  I can change the segment duration in the first step from 30 seconds to 60 seconds, and compare the MD5 hash of the final M3U8 playlist generated in both the cases using this command :

  


  ffmpeg -loglevel error -i <input m3u8="m3u8" playlist="playlist" /> -f md5 -&#xA;

  


  The MD5 hash of the output files differ, i.e., video streams of output_30.m3u8 and output_60.m3u8 are not the same.

  


  Can anyone elaborate on this ?

  


  (I expected the MD5 hash to be the same)

  


• How can several .ts files be converted to one (non-fragmented) .mp4 file using ffmpeg ?

  23 juin 2021, par verified_tinker

  Problem Description

  


  The video player I'm using doesn't support .ts files, but it does play .mp4 files, so I'd like to use ffmpeg to convert my .ts files to .mp4 files.

  


  Goal Solution

  


  Use ffmpeg to download several .ts segments and transcode them into an .mp4 file that I'd load into my video player. Rinse and repeat. It'd add a delay of 10-20 seconds, but that's fine.

  


  The trick is to do the transcoding fast enough so, by the time one .mp4 file is finished playing, the next one is available ; in other words, the transcoding should take less than a second per second of footage. Ideally, it would take significantly less than that, to account for varying processing power on different devices.

  


  To clarify, when I say .mp4, I don't mean fragmented .mp4 files.

  


  ---

  


  If transcoding to some other format is faster, that might be fine, too. For example, I know the .mkv format is playable. I'm still exploring the full range of available formats.

  


  What I've Tried

  


  I tested transcoding 1 .ts file into an .mp4 file, and unfortunately it took about 6 seconds when the file was about 4 seconds long. That was with ffmpeg-wasm. I was hoping the JavaScript bridge might be slowing it down and that batching several .ts segments in 1 call might help.

  


  Command

  


  ffmpeg -i test.ts test.mp4


  


  Log

  


  [info] run FS.writeFile test.ts <349304 bytes binary file>
log.js:15 [info] run ffmpeg command: -i test.ts test.mp4
log.js:15 [fferr] ffmpeg version v0.9.0-2-gb11e5c1495 Copyright (c) 2000-2020 the FFmpeg developers
log.js:15 [fferr]   built with emcc (Emscripten gcc/clang-like replacement) 2.0.8 (d059fd603d0b45b584f634dc2365bc9e9a6ec1dd)
log.js:15 [fferr]   configuration: --target-os=none --arch=x86_32 --enable-cross-compile --disable-x86asm --disable-inline-asm --disable-stripping --disable-programs --disable-doc --disable-debug --disable-runtime-cpudetect --disable-autodetect --extra-cflags='-s USE_PTHREADS=1 -I/src/build/include -O3 --closure 1' --extra-cxxflags='-s USE_PTHREADS=1 -I/src/build/include -O3 --closure 1' --extra-ldflags='-s USE_PTHREADS=1 -I/src/build/include -O3 --closure 1 -L/src/build/lib' --pkg-config-flags=--static --nm=llvm-nm --ar=emar --ranlib=emranlib --cc=emcc --cxx=em++ --objcc=emcc --dep-cc=emcc --enable-gpl --enable-nonfree --enable-zlib --enable-libx264 --enable-libx265 --enable-libvpx --enable-libwavpack --enable-libmp3lame --enable-libfdk-aac --enable-libtheora --enable-libvorbis --enable-libfreetype --enable-libopus --enable-libwebp --enable-libass --enable-libfribidi
log.js:15 [fferr]   libavutil      56. 51.100 / 56. 51.100
log.js:15 [fferr]   libavcodec     58. 91.100 / 58. 91.100
log.js:15 [fferr]   libavformat    58. 45.100 / 58. 45.100
log.js:15 [fferr]   libavdevice    58. 10.100 / 58. 10.100
log.js:15 [fferr]   libavfilter     7. 85.100 /  7. 85.100
log.js:15 [fferr]   libswscale      5.  7.100 /  5.  7.100
log.js:15 [fferr]   libswresample   3.  7.100 /  3.  7.100
log.js:15 [fferr]   libpostproc    55.  7.100 / 55.  7.100
log.js:15 [fferr] Input #0, mpegts, from 'test.ts':
log.js:15 [fferr]   Duration: 00:00:04.00, start: 10.006000, bitrate: 698 kb/s
log.js:15 [fferr]   Program 1 
log.js:15 [fferr]     Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(progressive), 1280x720, 23.98 tbr, 90k tbn, 1411200000.00 tbc
log.js:15 [fferr]     Stream #0:1[0x101]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 130 kb/s
log.js:15 [fferr] Stream mapping:
log.js:15 [fferr]   Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
log.js:15 [fferr]   Stream #0:1 -> #0:1 (aac (native) -> aac (native))
log.js:15 [fferr] [libx264 @ 0x1f5f080] using cpu capabilities: none!
log.js:15 [fferr] [libx264 @ 0x1f5f080] profile High, level 3.1, 4:2:0, 8-bit
log.js:15 [fferr] [libx264 @ 0x1f5f080] 264 - core 160 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=23 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
log.js:15 [fferr] Output #0, mp4, to 'test.mp4':
log.js:15 [fferr]   Metadata:
log.js:15 [fferr]     encoder         : Lavf58.45.100
log.js:15 [fferr]     Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1280x720, q=-1--1, 23.98 fps, 24k tbn, 23.98 tbc
log.js:15 [fferr]     Metadata:
log.js:15 [fferr]       encoder         : Lavc58.91.100 libx264
log.js:15 [fferr]     Side data:
log.js:15 [fferr]       cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
log.js:15 [fferr]     Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s
log.js:15 [fferr]     Metadata:
log.js:15 [fferr]       encoder         : Lavc58.91.100 aac
log.js:15 [fferr] frame=    3 fps=0.0 q=0.0 size=       0kB time=00:00:00.38 bitrate=   1.0kbits/s dup=1 drop=0 speed=0.521x    
log.js:15 [fferr] frame=   47 fps= 27 q=0.0 size=       0kB time=00:00:02.09 bitrate=   0.2kbits/s dup=1 drop=0 speed=1.22x    
log.js:15 [fferr] frame=   57 fps= 25 q=28.0 size=       0kB time=00:00:02.51 bitrate=   0.2kbits/s dup=1 drop=0 speed=1.13x    
log.js:15 [fferr] frame=   67 fps= 24 q=28.0 size=       0kB time=00:00:02.96 bitrate=   0.1kbits/s dup=1 drop=0 speed=1.08x    
log.js:15 [fferr] frame=   77 fps= 23 q=28.0 size=       0kB time=00:00:03.37 bitrate=   0.1kbits/s dup=1 drop=0 speed=1.03x    
log.js:15 [fferr] frame=   89 fps= 23 q=28.0 size=       0kB time=00:00:03.96 bitrate=   0.1kbits/s dup=1 drop=0 speed=1.04x    
log.js:15 [fferr] frame=   96 fps= 15 q=-1.0 Lsize=      60kB time=00:00:04.01 bitrate= 122.8kbits/s dup=1 drop=0 speed=0.646x    
log.js:15 [fferr] video:55kB audio:1kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 7.249582%
log.js:15 [fferr] [libx264 @ 0x1f5f080] frame I:1     Avg QP:17.20  size: 31521
log.js:15 [fferr] [libx264 @ 0x1f5f080] frame P:24    Avg QP:16.17  size:   735
log.js:15 [fferr] [libx264 @ 0x1f5f080] frame B:71    Avg QP:27.68  size:    91
log.js:15 [fferr] [libx264 @ 0x1f5f080] consecutive B-frames:  1.0%  0.0%  3.1% 95.8%
log.js:15 [fferr] [libx264 @ 0x1f5f080] mb I  I16..4: 26.2% 56.4% 17.4%
log.js:15 [fferr] [libx264 @ 0x1f5f080] mb P  I16..4:  0.1%  0.2%  0.0%  P16..4:  3.5%  0.4%  0.2%  0.0%  0.0%    skip:95.4%
log.js:15 [fferr] [libx264 @ 0x1f5f080] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  1.6%  0.0%  0.0%  direct: 0.0%  skip:98.3%  L0:31.0% L1:69.0% BI: 0.0%
log.js:15 [fferr] [libx264 @ 0x1f5f080] 8x8 transform intra:56.5% inter:59.4%
log.js:15 [fferr] [libx264 @ 0x1f5f080] coded y,uvDC,uvAC intra: 17.4% 15.4% 7.5% inter: 0.2% 0.4% 0.0%
log.js:15 [fferr] [libx264 @ 0x1f5f080] i16 v,h,dc,p: 29% 63%  1%  7%
log.js:15 [fferr] [libx264 @ 0x1f5f080] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 51% 31% 14%  0%  2%  1%  1%  0%  1%
log.js:15 [fferr] [libx264 @ 0x1f5f080] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 45% 11%  2%  3%  2%  4%  2%  4%
log.js:15 [fferr] [libx264 @ 0x1f5f080] i8c dc,h,v,p: 76% 17%  6%  1%
log.js:15 [fferr] [libx264 @ 0x1f5f080] Weighted P-Frames: Y:0.0% UV:0.0%
log.js:15 [fferr] [libx264 @ 0x1f5f080] ref P L0: 89.5%  1.6%  6.7%  2.3%
log.js:15 [fferr] [libx264 @ 0x1f5f080] ref B L0: 38.5% 60.9%  0.6%
log.js:15 [fferr] [libx264 @ 0x1f5f080] ref B L1: 97.7%  2.3%
log.js:15 [fferr] [libx264 @ 0x1f5f080] kb/s:111.08
log.js:15 [fferr] [aac @ 0x1f48100] Qavg: 65536.000
log.js:15 [ffout] FFMPEG_END
log.js:15 [info] run FS.readFile test.mp4
(index):38 Time elapsed: 6345 (This one's my own code.)
[info] run FS.readFile test.mp4


  


  (I'm running this on the browser. For the purposes of this question, consider the HTML player unavailable for use.)

  


  ---

  


  I also tested feeding the HLS live-stream URL as input to ffmpeg and outputting a single .mp4 file, but I couldn't play it until I ended the live-stream and ffmpeg finished downloading it.

  


  This one I ran on the (Windows) PC ; not the browser.

  


  Command

  


  ffmpeg -i https://stream.mux.com/lngMYGqNpHhYg2ZXqpH8WODVGzuenaZuhckdyunGpzU.m3u8 -acodec copy -bsf:a aac_adtstoasc -vcodec copy out.mp4


  


  Log

  


  The log is too large and StackOverflow won't let me paste it here, so I uploaded it to PasteBin : https://pastebin.com/FqvPQ1DZ