我认为这个问题不同于由图像创建的无损 H.264 MP4 文件无法在 QuickTime 中播放因为这个问题及其答案涉及转换一系列 PNG 图像。接受的答案对我的情况不起作用。它还建议为 crf 选择一个非零值，而我想要一个 0 值。
我需要将一堆 MOV 文件转换为 mp4，以便将它们导入 Apple Photos。我希望转换过程无损。
我尝试使用以下命令来转换单个文件，其中 crf = 0，以使其无损：
ffmpeg -i in.mov -c:v libx264 -crf 0 -c:a aac -map_metadata 0 out.mp4
（in.mov 为 400Mb，out.mp4 约为 600 Mb）
ffmpeg 顺利完成，但 Quicktime 无法打开该文件（该文件与 Quicktime Player 不兼容），并且 Photos 无法导入它。VLC 可以打开它并播放，没有问题。
将 crf 设置为 > 1 的值将导致 quicktime 可以打开文件。
有任何想法吗？
使用 crf 0 进行转换的日志
~/Documents/Movies/Originals/2011 ffmpeg -i clip-2011-11-19\ 15\;10\;42\ \(id\).mov -c:v libx264 -crf 0 -c:a aac -map_metadata 0 ~/Downloads/out.mp4 > ~/Downloads/log.txt
ffmpeg version 4.1.1 Copyright (c) 2000-2019 the FFmpeg developers
built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)
configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/openjdk-11.0.2.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/openjdk-11.0.2.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
libavutil 56. 22.100 / 56. 22.100
libavcodec 58. 35.100 / 58. 35.100
libavformat 58. 20.100 / 58. 20.100
libavdevice 58. 5.100 / 58. 5.100
libavfilter 7. 40.101 / 7. 40.101
libavresample 4. 0. 0 / 4. 0. 0
libswscale 5. 3.100 / 5. 3.100
libswresample 3. 3.100 / 3. 3.100
libpostproc 55. 3.100 / 55. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'clip-2011-11-19 15;10;42 (id).mov':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt
creation_time : 2011-11-20T18:19:29.000000Z
com.apple.proapps.originalFormat: AVCHD 720p25
com.apple.proapps.reel: NO NAME
com.apple.proapps.isGood: 0
com.apple.proapps.clipID: 000000000993d800e7c246220adc51964b39254c2e0e92c76a06b020d854bdb657d015d58964beeb a63c13f541815de16111047b0c330067ee9d8070d2c8fa22eeb097dd58e15461c1c0e7060096774eb9b636c79ce3e48
com.apple.quicktime.creationdate: 2011-11-19T15:10:42+0000
Duration: 00:01:27.36, start: 0.000000, bitrate: 37052 kb/s
Stream #0:0(eng): Video: aic (icod / 0x646F6369), yuv420p(bt709, progressive), 1280x720, 35481 kb/s, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 2500 tbn, 2500 tbc (default)
Metadata:
creation_time : 2011-11-20T18:19:29.000000Z
handler_name : Apple Video Media Handler
encoder : Apple Intermediate Codec
timecode : 00:00:00:00
Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, stereo, s16, 1536 kb/s (default)
Metadata:
creation_time : 2011-11-20T18:19:29.000000Z
handler_name : Apple Sound Media Handler
Stream #0:2(eng): Data: none (tmcd / 0x64636D74)
Metadata:
creation_time : 2011-11-20T18:19:29.000000Z
handler_name : Time Code Media Handler
timecode : 00:00:00:00
Stream mapping:
Stream #0:0 -> #0:0 (aic (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (pcm_s16le (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 0x7fef1b817600] using SAR=1/1
[libx264 @ 0x7fef1b817600] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x7fef1b817600] profile High 4:4:4 Predictive, level 3.1, 4:2:0 8-bit
[libx264 @ 0x7fef1b817600] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=0 mixed_ref=1 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=0 chroma_qp_offset=0 threads=18 lookahead_threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc=cqp mbtree=0 qp=0
Output #0, mp4, to '/Users/channing/Downloads/out.mp4':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt
creation_time : 2011-11-20T18:19:29.000000Z
com.apple.proapps.originalFormat: AVCHD 720p25
com.apple.proapps.reel: NO NAME
com.apple.proapps.isGood: 0
com.apple.proapps.clipID: 000000000993d800e7c246220adc51964b39254c2e0e92c76a06b020d854bdb657d015d58964beeb a63c13f541815de16111047b0c330067ee9d8070d2c8fa22eeb097dd58e15461c1c0e7060096774eb9b636c79ce3e48
com.apple.quicktime.creationdate: 2011-11-19T15:10:42+0000
encoder : Lavf58.20.100
Stream #0:0(eng): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 0.04 fps, 12800 tbn, 25 tbc (default)
Metadata:
creation_time : 2011-11-20T18:19:29.000000Z
handler_name : Apple Video Media Handler
timecode : 00:00:00:00
encoder : Lavc58.35.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
Metadata:
creation_time : 2011-11-20T18:19:29.000000Z
handler_name : Apple Sound Media Handler
encoder : Lavc58.35.100 aac
frame= 2184 fps= 53 q=-1.0 Lsize= 831156kB time=00:01:27.36 bitrate=77939.9kbits/s speed=2.13x
video:829737kB audio:1368kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.005997%
[libx264 @ 0x7fef1b817600] frame I:9 Avg QP: 0.00 size:426350
[libx264 @ 0x7fef1b817600] frame P:2175 Avg QP: 0.00 size:388880
[libx264 @ 0x7fef1b817600] mb I I16..4: 34.2% 0.0% 65.8%
[libx264 @ 0x7fef1b817600] mb P I16..4: 24.7% 0.0% 27.5% P16..4: 21.2% 13.8% 12.5% 0.0% 0.0% skip: 0.3%
[libx264 @ 0x7fef1b817600] 8x8 transform intra:0.0% inter:75.2%
[libx264 @ 0x7fef1b817600] coded y,uvDC,uvAC intra: 99.4% 99.7% 99.7% inter: 94.3% 95.2% 95.1%
[libx264 @ 0x7fef1b817600] i16 v,h,dc,p: 54% 46% 0% 0%
[libx264 @ 0x7fef1b817600] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 43% 46% 3% 1% 2% 2% 2% 1% 1%
[libx264 @ 0x7fef1b817600] i8c dc,h,v,p: 0% 49% 50% 0%
[libx264 @ 0x7fef1b817600] Weighted P-Frames: Y:0.2% UV:0.1%
[libx264 @ 0x7fef1b817600] ref P L0: 75.0% 16.1% 6.5% 2.4% 0.0%
[libx264 @ 0x7fef1b817600] kb/s:77806.84
[aac @ 0x7fef1b808000] Qavg: 419.244