Michael Niedermayer:
> On Wed, Mar 26, 2025 at 04:08:55AM +0000, Andreas Rheinhardt wrote:
>> ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt@outlook.com> | Mon Mar  3 02:36:55 2025 +0100| [24dbc4c2e82481f89d6fcacee1949e5038c5c2fc] | committer: Andreas Rheinhardt
>>
>> avcodec/mjpegenc: Simplify allocating huffman table
>>
>> Reuse the already computed value of macroblocks; use an array
>> instead of a switch, evaluate 64 * sizeof(MJpegHuffmanCode)
>> at compile-time.
>>
>> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
>>
>>> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=24dbc4c2e82481f89d6fcacee1949e5038c5c2fc
>> ---
>>
>>  libavcodec/mjpegenc.c | 24 ++++++++++--------------
>>  1 file changed, 10 insertions(+), 14 deletions(-)
> 
> Breaks: (did not investigate why)
> 
> ./ffmpeg  -i lena.pnm -strict -1 -s 4096x2048 -bitexact -y /tmp/file-4096x2048.m2v && ./ffmpeg -i /tmp/file-4096x2048.m2v -y -bitexact /tmp/file-4096x2048-dec.jpg
> 
> [vost#0:0/mjpeg @ 0x5576d6b7ab00] [enc:mjpeg @ 0x5576d6b79580] Error while opening encoder - maybe incorrect parameters such as bit_rate, rate, width or height.
> [vf#0:0 @ 0x5576d6b7f140] Error sending frames to consumers: Cannot allocate memory
> [vf#0:0 @ 0x5576d6b7f140] Task finished with error code: -12 (Cannot allocate memory)
> [vf#0:0 @ 0x5576d6b7f140] Terminating thread with return code -12 (Cannot allocate memory)
> [vost#0:0/mjpeg @ 0x5576d6b7ab00] [enc:mjpeg @ 0x5576d6b79580] Could not open encoder before EOF
> [vost#0:0/mjpeg @ 0x5576d6b7ab00] Task finished with error code: -22 (Invalid argument)
> [vost#0:0/mjpeg @ 0x5576d6b7ab00] Terminating thread with return code -22 (Invalid argument)
> [out#0/image2 @ 0x5576d6b7ec80] Nothing was written into output file, because at least one of its streams received no packets.
> 

Patch attached. Thanks for testing.

- Andreas