Metadata lyrics

[p92]

Summary of the bug:
i can store a metadata [lyrics] with more than 1024 bytes, but i can not read more of 1024 byte on the file mp4.
Why ?

[Carl Eugen Hoyos]

This has currently no similarities with a valid ticket.

Is your problem reproducible with ffmpeg (the application)? If yes please provide the command line that allows to reproduce the issue together with the complete, uncut console output and a sample.
If not please explain how we can reproduce your problem.

[p92]

the file on the link has the lyrics tag with size 3476 bytes.
while ffmpeg reads ONLY the first 1024 bytes.
link file test: ​http://www.karaoke5.com/public/stream.mp4

ffmpeg version N-66249-gbcac0f4 build gcc 4.8.3

line command : ffmpeg -i stream.mp4 -f ffmetadata metadata.txt

result:

;FFMETADATA1
major_brand=isom
minor_version=512
compatible_brands=isomiso2avc1mp41
lyrics=+ceZFVZcV0Fn3C+hzhr8x9vsDMQOUlgCk9gcGig1WC4SYX528Zhc1rpLzkTfuKE1XitHl34PUAayecZkmFAK9bG5TKH+Bd03u2PROtaljlfHhpgwani5StQYT7IT3bHKbCsCNFUQ/UpmmJo59FX3Rm5uzgEZn8O13QWozrVyIPvTd2QPO6I+gNwJm9yvMatzo7S04uIuBfzbSo11z7WdATGN/CEvt0GTgPKCmYFXdA8dTJ+PaSs872UAMlWHOwCKaL4NKeZMhhBxtLTYqrIO5sxOfRF/lzMsRPLWxkCVwks2KBftw8tAoL274Yzs1j3swjh6dLJiFZtyzVlALX6Lqdd68S3WrN5RQ36jKI5opoXQRl+5Hrt2e1lpZBBTLAXLYJcbztgYmOQvPmwzjc87hq4pk0eq4xae3SECyxksjG+f0Yxyu9iQulIMZ3+aDtuTzM7z14Xt2sxPZQEo/pJDnoJgrnzJKfmn9TMvLO9di41eiHZ2/ZqDqbiLv4FAbW6MsJL3lQ3KUJy+0fm5EgpUi106jCdmIiYgmqHZMJALlvIyB+FvcFSohH/Yr+CztCA5lpdw7gBO9D7m/t8qeykWzxQ6Rrp6XeTW6FgXmi40HgOJaQ30l1PJF0VM3egW46U6KdvzEzSmLSCkTP/q+RWdv4LzrhXrH6BrhPmBUjhHhKNui+AO+PhwwIXgNtXJtUbb2ewlI9xLSr20lQNukeH9nBMHofF2DUBp34inn4xP4yfzLWjl1C1LbKxwZo6ydss/L/0To66Jyj0dUj/NswLrGKHxw6k0QiK5DpJMv6IBwwEPNNoWJiqrh7xqc45XiYnAXSwyguK8mGTMj2Jf9s7lNMoQe6uuvhJxXVL0SlkR0VFDSyb3FMzAo/rzX5xNahz0MXO2OIlVFe+lee/rZbOYzD6UXNdWTxy3/gQcL9FAP/M8g9OVJsv1UTXqwAHzJtAd9A8K5jcs2+4Kcc9MrtxLLU/eAxDk92EXWE7Ep8rTx1HTHsf7d1OHchc66WcsOT1
encoder=Lavf56.4.101

thank

[Carl Eugen Hoyos]

What's wrong with ffmpeg -i stream.mp4?

[p92]

Maybe I can not explain.
Reading the tag "lyrics", instead of reading 3476 bytes, READ ONLY 1024 BYTES.

The complete tag "lyrics" is this:
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

->>>>Everything in bold is truncated

an additional information: the mkv format instead reads the tag lyrics correctly.
With the MP4 format instead reads the first 1024 bytes of characters.

[Michael Niedermayer]

probably fixed in f31445a82d6acd0b8fab5a26c04e91645f4854d8
I could not test as the file is 404

[Carl Eugen Hoyos]

Sample uploaded to ​http://samples.ffmpeg.org/ffmpeg-bugs/trac/ticket4018/