On Mon Apr 7 17:32:13 BST 2014, Trevor Campbell Davis wrote:

One query.

If I download a thumbnail as described (after the event) to replace a grey
rectangle, can I / how do I then merge it with the original downloaded mp4?

Hello, Trevor.
You can use the CLI MP4 tagger AtomicParsley, already part of the get_iplayer installation. You mention nothing about the type & version of your OS, I can only speak about Windows x86. The AtomicParsley executable is found inside GiP's installation folder, in my case:

C:\Program Files\get_iplayer\AtomicParsley\AtomicParsley.exe

First, do back-up your MP4 file, especially if it's an expired programme, in case something goes awry...

Open a command prompt window inside the AtomicParsley folder (for Vista and higher, keep SHIFT pressed and right click on the folder; from the context menu, choose "Open Command Window Here").

If you run:

Atomicparsley "/path/to[file_with_grey_thumbnail.mp4]" --artwork REMOVE_ALL --overWrite

the grey thumbnail will be removed.

Then,

Atomicparsley "/path/to[file_with_no_thumbnail.mp4]" --artwork "/path/to[correct_thumbnail.jpg]" --overWrite

will produce an MP4 file with the correct thumbnail embedded.

(the procedure also works for M4A audio files - I myself was hit once by this "grey thumbnail" bug on a Radio 2 programme... )
(NB: --overWrite is with a capital W).

Hope I've helped :-)

Vangelis

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