What is the right command to produce a Lossless JPEG file ?
magick wizard: ppm:- | ffmpeg -v trace -i - -map 0:v -c:v ljpeg -b:v 1M
-pred median -f mjpeg -y wizard.jpg
ffmpeg version N-119135-g1722f08acf Copyright (c) 2000-2025 the FFmpeg
developers
built with gcc 11 (Ubuntu 11.4.0-1ubuntu1~22.04)
configuration: --prefix=/usr --disable-static --enable-shared
--enable-gpl --enable-version3 --disable-doc --disable-avdevice
--enable-swresample --disable-swscale --disable-postproc --disable-network
--disable-everything --enable-protocol='fd, file, subfile, pipe'
--enable-demuxer='image_jpeg_pipe, mjpeg, mpjpeg, smjpeg, image_ppm_pipe'
--enable-muxer='mjpeg, mpjpeg, smjpeg' --enable-decoder='mjpeg, ppm'
--enable-encoder='ljpeg, mjpeg, ppm' --disable-ffplay
libavutil 60. 0.100 / 60. 0.100
libavcodec 62. 0.101 / 62. 0.101
libavformat 62. 0.100 / 62. 0.100
libavfilter 11. 0.100 / 11. 0.100
libswresample 6. 0.100 / 6. 0.100
Splitting the commandline.
Reading option '-v' ... matched as option 'v' (set logging level) with
argument 'trace'.
Reading option '-i' ... matched as input url with argument '-'.
Reading option '-map' ... matched as option 'map' (set input stream
mapping) with argument '0:v'.
Reading option '-c:v' ... matched as option 'c' (select encoder/decoder
('copy' to copy stream without reencoding)) with argument 'ljpeg'.
Reading option '-b:v' ... matched as option 'b' (video bitrate (please use
-b:v)) with argument '1M'.
Reading option '-pred' ... matched as AVOption 'pred' with argument
'median'.
Reading option '-f' ... matched as option 'f' (force container format
(auto-detected otherwise)) with argument 'mjpeg'.
Reading option '-y' ... matched as option 'y' (overwrite output files) with
argument '1'.
Reading option 'wizard.jpg' ... matched as output url.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option v (set logging level) with argument trace.
Applying option y (overwrite output files) with argument 1.
Successfully parsed a group of options.
Parsing a group of options: input url -.
Successfully parsed a group of options.
Opening an input file: -.
[AVFormatContext @ 0x5ea397c38a40] Opening 'fd:' for reading
[fd @ 0x5ea397c39200] Setting default whitelist 'crypto,data'
Probing ppm_pipe score:52 size:2048
[ppm_pipe @ 0x5ea397c38a40] Format ppm_pipe probed with size=2048 and
score=52
[ppm_pipe @ 0x5ea397c38a40] Before avformat_find_stream_info() pos: 0 bytes
read:16384 seeks:0 nb_streams:1
[ppm_pipe @ 0x5ea397c38a40] parser not found for codec ppm, packets or
times may be invalid.
[ppm_pipe @ 0x5ea397c38a40] stream 0: start_time: NOPTS duration: NOPTS
[ppm_pipe @ 0x5ea397c38a40] format: start_time: NOPTS duration: NOPTS
(estimate from bit rate) bitrate=0 kb/s
[ppm_pipe @ 0x5ea397c38a40] Could not find codec parameters for stream 0
(Video: ppm, 1 reference frame, none): unspecified size
Consider increasing the value for the 'analyzeduration' (0) and 'probesize'
(5000000) options
[ppm_pipe @ 0x5ea397c38a40] After avformat_find_stream_info() pos: 0 bytes
read:16384 seeks:0 frames:0
Input #0, ppm_pipe, from 'fd:':
Duration: N/A, bitrate: N/A
Stream #0:0, 0, 1/25: Video: ppm, 1 reference frame, none, 25 fps, 25
tbr, 25 tbn
Successfully opened the file.
Parsing a group of options: output url wizard.jpg.
Applying option map (set input stream mapping) with argument 0:v.
Parsing stream specifier: v
Parsed media type: video; remainder:
Applying option c:v (select encoder/decoder ('copy' to copy stream without
reencoding)) with argument ljpeg.
Parsing stream specifier: v
Parsed media type: video; remainder:
Applying option b:v (video bitrate (please use -b:v)) with argument 1M.
Applying option f (force container format (auto-detected otherwise)) with
argument mjpeg.
Successfully parsed a group of options.
Opening an output file: wizard.jpg.
[out#0/mjpeg @ 0x5ea397c3b5c0] Adding streams from explicit maps...
[vost#0:0/ljpeg @ 0x5ea397c3c0c0] Created video stream from input stream 0:0
Parsing stream specifier: v
Parsed media type: video; remainder:
[file @ 0x5ea397c48040] Setting default whitelist 'file,crypto,data'
Successfully opened the file.
Stream mapping:
Stream #0:0 -> #0:0 (ppm (native) -> ljpeg (native))
[vost#0:0/ljpeg @ 0x5ea397c3c0c0] Starting thread...
[vf#0:0 @ 0x5ea397c3d680] Starting thread...
[vist#0:0/ppm @ 0x5ea397c3ae40] [dec:ppm @ 0x5ea397c43880] Starting
thread...
[in#0/ppm_pipe @ 0x5ea397c386c0] Starting thread...
[in#0/ppm_pipe @ 0x5ea397c386c0] EOF while reading input
[in#0/ppm_pipe @ 0x5ea397c386c0] Terminating thread with return code 0
(success)
[vist#0:0/ppm @ 0x5ea397c3ae40] [dec:ppm @ 0x5ea397c43880] Decoder thread
received EOF packet
[vist#0:0/ppm @ 0x5ea397c3ae40] [dec:ppm @ 0x5ea397c43880] Decoder returned
EOF, finishing
[vist#0:0/ppm @ 0x5ea397c3ae40] [dec:ppm @ 0x5ea397c43880] Terminating
thread with return code 0 (success)
[vf#0:0 @ 0x5ea397c3d680] Cannot determine format of input 0:0 after EOF
[vf#0:0 @ 0x5ea397c3d680] Task finished with error code: -1094995529
(Invalid data found when processing input)
[vf#0:0 @ 0x5ea397c3d680] Terminating thread with return code -1094995529
(Invalid data found when processing input)
[vost#0:0/ljpeg @ 0x5ea397c3c0c0] [enc:ljpeg @ 0x5ea397c3cb00] Encoder
thread received EOF
[vost#0:0/ljpeg @ 0x5ea397c3c0c0] [enc:ljpeg @ 0x5ea397c3cb00] Could not
open encoder before EOF
[vost#0:0/ljpeg @ 0x5ea397c3c0c0] Task finished with error code: -22
(Invalid argument)
[vost#0:0/ljpeg @ 0x5ea397c3c0c0] Terminating thread with return code -22
(Invalid argument)
[out#0/mjpeg @ 0x5ea397c3b5c0] Nothing was written into output file,
because at least one of its streams received no packets.
frame= 0 fps=0.0 q=0.0 Lsize= 0KiB time=N/A bitrate=N/A speed=N/A
[AVIOContext @ 0x5ea397c47f00] Statistics: 0 bytes written, 0 seeks, 0
writeouts
[in#0/ppm_pipe @ 0x5ea397c386c0] Input file #0 (fd:):
[in#0/ppm_pipe @ 0x5ea397c386c0] Input stream #0:0 (video): 0 packets
read (0 bytes); 0 frames decoded; 0 decode errors;
[in#0/ppm_pipe @ 0x5ea397c386c0] Total: 0 packets (0 bytes) demuxed
[AVIOContext @ 0x5ea397c495c0] Statistics: 16384 bytes read, 0 seeks
Conversion failed!
Gianluca
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